DNV standard documentation types guide

RECOMMENDED PRACTICE
DET NORSKE VERITAS
DNV-RP-A201
STANDARD DOCUMENTATION TYPES
NOVEMBER 2000

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FOREWORD
DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, prop-
erty and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancy
services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research
in relation to these functions.
DNV Offshore Codes consist of a three level hierarchy of documents:
— Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and con-
sultancy services.
— Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as
the technical basis for DNV offshore services.
— Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level
Offshore Service Specifications and Offshore Standards.
DNV Offshore Codes are offered within the following areas:
A) Qualification, Quality and Safety Methodology
B) Materials Technology
C) Structures
D) Systems
E) Special Facilities
F) Pipelines and Risers
G) Asset Operation

DET NORSKE VERITAS
Recommended Practice DNV-RP-A201, November 2000
Page 3
CONTENTS
1. GENERAL .............................................................. 5
1.1 Organisation of the documentation types .............5
1.2 General requirements to all documentation .........5
1.3 References ................................................................5
1.4 Abbreviations...........................................................5
1.5 Verbal forms ............................................................5
1.6 Qualifications...........................................................5
2. STANDARD DOCUMENTATION TYPES........ 6
2.1 Discipline A – Administration ................................6
2.2 Discipline B – Stability and load line.....................6
2.2.1 General................................................................................6
2.2.2 B020 – Stability analysis ....................................................6
2.2.3 B030 – Inclining test and lightweight survey procedure....6
2.2.4 B040 – Inclining test or lightweight survey report.............7
2.2.5 B050 – Preliminary stability manual..................................7
2.2.6 B060 – Final stability manual.............................................9
2.2.7 B070 – Lines plan and offset tables....................................9
2.2.8 B080 – External watertight integrity plan ..........................9
2.2.9 B090 – Internal watertight integrity plan............................9
2.2.10 B100 – Freeboard plan........................................................9
2.2.11 B110 – List of watertight and weathertight items ..............9
2.3 Discipline C – Mechanical ...................................10
2.3.1 C020 – Design criteria......................................................10
2.3.2 C030 – Assembly or arrangement drawing ......................10
2.3.3 C040 – Detailed drawing..................................................10
2.3.4 C050 – Design analysis ....................................................10
2.3.5 C060 – Non-destructive testing (NDT) methods, extent and
criteria...............................................................................10
2.4 Discipline D – Drilling...........................................10
2.5 Discipline E - Electrical ........................................10
2.5.1 E020 – Overall single line diagram ..................................10
2.5.2 E030 – Principal cable routing sketch ..............................10
2.5.3 E040 – Cable selection philosophy...................................10
2.5.4 E050 – Alternating current (AC) power consumption
balance ..............................................................................10
2.5.5 E060 – Alternating current (AC) power consumer list....10
2.5.6 E070 – Direct current (DC) power consumption balance 10
2.5.7 E080 – Direct current (DC) power consumer list.............10
2.5.8 E090 – Discrimination analysis........................................10
2.5.9 E100 – Table of Ex-installation........................................11
2.5.10 E110 – Electrical system calculations ..............................11
2.5.11 E120 – Cable data sheet and design drawing ...................11
2.5.12 E130 – Electrical data sheet, general................................11
2.5.13 E140 – Electrical data sheet, semiconductor assemblies..11
2.5.14 E150 – Assembly schedules and technical data ...............11
2.5.15 E160 – Strength calculation with respect to short circuit.12
2.5.16 E170 – Internal arc withstanding report ...........................12
2.5.17 E180 – Electrical schematic drawing ...............................12
2.5.18 E190 – Switchboard layout...............................................12
2.5.19 E200 – Lighting description .............................................12
2.6 Discipline F – Information technology ................12
2.7 Discipline G – Safety ............................................12
2.7.1 G020 – Risk analysis ........................................................12
2.7.2 G030 – Emergency and preparedness analysis.................12
2.7.3 G040 – Design accidental load specification....................12
2.7.4 G050 – Fire control plan...................................................12
2.7.5 G060 – Safety control plan...............................................12
2.7.6 G070 – Structural fire protection drawing........................12
2.7.7 G080 – Source of release schedule...................................12
2.7.8 G090 – Hazardous area classification drawing ................12
2.7.9 G100 – Area safety chart or fire protection data sheet .....13
2.7.10 G110 – Escape and evacuation study ...............................13
2.7.11 G120 – Dispersion study ..................................................13
2.7.12 G130 – Escape route drawing...........................................13
2.7.13 G140 – Cause and effect diagram.....................................13
2.8 Discipline H – Hull and structure .......................13
2.8.1 H020 – Structural design brief..........................................13
2.8.2 H030 – Design load plan ..................................................13
2.8.3 H040 – Plan for spaces and tanks.....................................13
2.8.4 H050 – Structural categorisation plan ..............................14
2.8.5 H060 – Structural drawing ...............................................14
2.8.6 H070 – Shell expansion drawing......................................14
2.8.7 H080 – Standard details....................................................14
2.8.8 H090 – Design analyses ...................................................14
2.8.9 H100 – Model test documentation....................................14
2.8.10 H110 – Equipment number calculation............................14
2.8.11 H120 – Loading manual ...................................................14
2.8.12 H130 – Docking arrangement plan...................................14
2.8.13 H140 – Fabrication specification......................................14
2.9 Discipline I – Instrumentation ............................15
2.9.1 I020 – Control and monitoring system functional
description ........................................................................15
2.9.2 I030 – Control and monitoring system block diagram.....15
2.9.3 I040 – Control and monitoring system user interface .....15
2.9.4 I050 – Control and monitoring system power supply
arrangement ......................................................................15
2.9.5 I060 – Control and monitoring system cable routing sketch
15
2.9.6 I070 – Instrument list........................................................15
2.9.7 I080 – Instrument data sheets with environmental
specifications ....................................................................15
2.9.8 I090 – Schematic description of input and output circuits15
2.10 Discipline J – Marine operations ........................15
2.11 Discipline K – Inspection......................................15
2.11.1 K020 – Facility plan for in-service inspection .................15
2.12 Discipline M – Materials ......................................15
2.12.1 M020 – Material specification, metals .............................15
2.12.2 M030 – Material specification, fire related properties .....16
2.12.3 M040 – Material specification, non-metallic materials....16
2.12.4 M050 – Coating specification...........................................16
2.12.5 M060 – Cathodic protection specification, calculation and
drawings............................................................................16
2.12.6 M070 – Welding procedures ............................................16
2.12.7 M080 – List of combustible mterials................................16
2.13 Discipline N – Navigation ....................................16
2.13.1 N020 – Bridge design drawing.........................................16
2.13.2 N030 – Field of vision drawing........................................16
2.14 Discipline O – Operation......................................16
2.14.1 O020 – Unit operation manual .........................................16
2.15 Discipline P – Process ...........................................17
2.15.1 P020 – Flow diagram........................................................17
2.15.2 P030 – Sizing calculations................................................17
2.15.3 P040 – Temperature calculations .....................................17
2.15.4 P050 – Materials selection report .....................................17
2.15.5 P060 – Flare heat radiation study .....................................17
2.15.6 P070 – Safety analysis tables............................................17
2.15.7 P080 – Pressure vessel integrity study .............................17
2.15.8 P090 – Flare and blowdown system report ......................17
2.16 Discipline Q – Quality management....................17
2.16.1 Q020 – Quality manual.....................................................17
2.16.2 Q030 – Process control procedure....................................17
2.16.3 Q040 – Document control procedure ...............................17
2.16.4 Q050 – Construction schedule..........................................17
2.16.5 Q060 – Document register................................................17
2.17 Discipline S – Piping ............................................17
2.17.1 S020 – System diagram (P&ID).......................................17
2.17.2 S030 – Pressure drop analysis ..........................................17
2.17.3 S040 – Capacity analysis..................................................17
2.17.4 S050 – Hydraulic or pneumatic control diagram..............17
2.17.5 S060 – Connections to the shell and to sea chests............18
2.17.6 S070 – Pipe routing sketch...............................................18
2.17.7 S080 – Pipe stress analysis...............................................18
2.17.8 S090 – Thermal stress analysis.........................................18
2.17.9 S100 – Specification of piping, valves, flanges and fittings
18
2.17.10 S110 – Line index.............................................................18
2.18 Discipline T – Telecommunications ....................18
2.18.1 T020 – Communication system functional description....18

DET NORSKE VERITAS
Page 4
2.18.2 T030 – Communication system block diagram ................18
2.18.3 T040 – Communication system user interface..................18
2.18.4 T050 – Communication system power supply arrangement.
18
2.18.5 T060 – Communication system cable routing sketch.......18
2.18.6 T070 – Communication system data sheets with
environmental specifications ............................................19
2.19 Discipline U – Subsea ...........................................19
2.20 Discipline V – Heat, ventilation and air
conditioning ...........................................................19
2.20.1 V020 – System diagram (D&ID)......................................19
2.20.2 V030 – Pressure drop analysis..........................................19
2.20.3 V040 – Capacity calculation.............................................19
2.20.4 V050 – Hydraulic or pneumatic control diagram .............19
2.20.5 V060 – Duct routing sketch ..............................................19
2.20.6 V070 – Penetration drawings............................................19
2.20.7 V080 – Flow diagram .......................................................19
2.21 Discipline W – Soil and foundation ....................19
2.21.1 W020 – Typical soil conditions ........................................19
2.21.2 W030 – Soil investigation report ......................................19
2.21.3 W040 – Pile foundation design.........................................19
2.21.4 W050 – Gravity foundation design...................................19
2.21.5 W060 – Anchor foundation design ...................................19
2.22 Discipline Y – Pipeline ......................................... 19
2.23 Multidiscipline Z................................................... 19
2.23.1 Z020 – General arrangement plan.....................................19
2.23.2 Z030 – Local arrangement plan........................................19
2.23.3 Z040 – System arrangement plan .....................................20
2.23.4 Z050 – Unit specification..................................................20
2.23.5 Z060 – System design philosophy....................................20
2.23.6 Z070 – System functional description ..............................20
2.23.7 Z080 – Failure mode description......................................20
2.23.8 Z090 – Reliability and availability analysis......................20
2.23.9 Z100 – Equipment list.......................................................20
2.23.10 Z110 – Specification.........................................................20
2.23.11 Z120 – Data sheet .............................................................20
2.23.12 Z130 – Test procedure at manufacturer............................20
2.23.13 Z140 – Report from test at manufacturer..........................20
2.23.14 Z150 – Test procedure for quay or sea trial......................20
2.23.15 Z160 – Report from quay or sea trial................................20
2.23.16 Z170 – Operation manual .................................................20
2.23.17 Z180 – Installation manual ...............................................20
2.23.18 Z190 – Maintenance manual.............................................20
2.23.19 Z200 – List of signboards .................................................21
2.23.20 Z210 – Environmental regularity number (ERN) calculation
21

DET NORSKE VERITAS
Page 5
1. General
1.1 Organisation of the documentation types
The standardised documentation types defined in this docu-
ment are organised according to engineering disciplines.
The following engineering disciplines are used:
1.2 General requirements to all documentation
English language should be used. Other languages may be
used upon special agreement.
The documentation may be submitted on paper or as an elec-
tronic file. For electronic files, the format and transfer method
shall be agreed.
Each drawing shall include a title field stating:
— name of unit (when known)
— name of document issuing company
— name and signature of originator and verifier
— document number
— document title
— revision nunber
— issue date
— scale
— set of measurement units used in the document, e.g. Sys-
tem International.
Symbols used shall be explained, or reference to a standard
code shall be given.
Any documents submitted for re-approval or re-examination
shall be specially marked to identify the revised parts.
The document title should not include the name of the unit. The
document title should include the system, function, structural
region or equipment covered by the document.
Unique revision numbers shall be allocated to all issues of a
document, including the first issue. For documents with multi-
ple sheets, the revision number should be the same for all
sheets.
1.3 References
1.4 Abbreviations
1.5 Verbal forms
Shall: Indicates a mandatory requirement to be followed for
fulfilment or compliance with the present recommended prac-
tice.
Should: Indicates a recommendation that a certain course of
action is preferred or particularly suitable. Alternative courses
of action are allowable, but shall be justified and documented.
May: Indicates a permission, or an option, which is permitted.
Can: Requirements with can are conditional and indicate a
possibility.
Table 1-1 Engineering disciplines
Code Title
A Administration
B Stability and load line
C Mechanical
D Drilling
E Electrical
F Information technology
G Safety
H Hull and structure
I Instrumentation
J Marine operations
K Inspection
L
M Materials
N Navigation
O Operation
P Process
Q Quality management
R
S Piping
T Telecommunications
U Subsea
V Heat, ventilation and air conditioning (HVAC)
W Soil and foundations
X
Y Risers and pipelines
Z Multidiscipline
Table 1-2 References
Reference Issuing body and title
API RP14C American Petroleum Institute: Recommended
Practise for Analysis, Design, Installation, and
Testing of Basic Surface Safety Systems for Off-
shore Production Platforms
DNV-OS-E301 Det Norske Veritas: Position Mooring
IEC 60298 International Electrotechnical Commission: A.C.
metal-enclosed switchgear and controlgear for
rated voltages above 1 kV and up to and including
52 kV
ILLC 1966 International Maritime Organisation: Internation-
al Convention on Load Lines, 1966
IMO Resolution
A.760(18)
International Maritime Organisation: Symbols for
Use in accordance with Regulation III/9.2.3 of the
1974 SOLAS Convention, as amended
ISO 8501-1 International Standardisation Organisation: Prep-
aration of Steel Substrates before Application of
Paint and Related Products – Visual Assessment
of Surface Cleanliness
MODU Code
1989
International Maritime Organisation: Code for the
Construction and Equipment of Mobile Offshore
Units, 1989
Table 1-3 Abbreviations
Abbreviation Full text
AC Alternating current
D&ID Duct and instrument diagram
DC Direct current
EMC Electromagnetic compatibility
ERN Environmental regularity number
GM Metacentric height
GZ Righting lever
HAZOP Hazard and operability study
HVAC Heat, ventilation and air conditioning
IP Ingress protection of enclosures
LCG Longitudinal centre of gravity
NDE Normally de-energised
NDT Non-destructive testing
NE Normally energised
P&ID Pipe and instrument diagram
SN Stress and number of cycles
TE The time it takes for a motor, starting from the nor-
mal operating temperature, to reach the temperature
given by the temperature class of the Ex certificate
if the rotor is locked
UPS Uniterruptible power supply
VCG Vertical centre of gravity

DET NORSKE VERITAS
Page 6
1.6 Qualifications
All statements and requirements given in this recommended
practice shall be understood ‘as applicable’ or ‘as relevant’ for
the unit in question. Such qualifications are therefore not in-
cluded in the text describing the individual standard documen-
tation types.
2. Standard documentation types
2.1 Discipline A – Administration
No special standard documentation types are defined for the
administration discipline.
2.2 Discipline B – Stability and load line
2.2.1 General
The following paragraphs describe the documentation needed
in order to approve the stability of a mobile offshore unit. The
MODU Code 1989 contains requirements to operation manu-
als, which also includes stability information. The documenta-
tion requirements to the preliminary and final stability manual
described in the following cover the MODU Code 1989 re-
quirements related to stability information in the operation
manual. The owner has the option to include the content of the
stability manual in the operation manual or to keep the stability
manual as a stand-alone document that is referred to in the op-
eration manual.
2.2.2 B020 – Stability analysis
The purpose of the stability analysis is to document the deter-
mination of the limiting maximum allowable VCG (vertical
centre of gravity), and eventually other limitations related to
floatability and stability. These are the limits that the unit must
be operated within in order to comply with rules and regula-
tions.
The maximum allowable VCG depends on the following fac-
tors:
— buoyant parts of the hull, superstructures and deck houses
— wind exposed portions of the unit
— internal subdivision
— external watertight integrity
— internal watertight integrity.
The stability analysis shall contain documentation on the fol-
lowing:
— rules and regulations and their corresponding intact and
damage stability criteria
— description of the unit, volumes included as buoyant, inter-
nal subdivision and watertight arrangement
— definitions of axis, baseline, etc.
— hydrostatic tables
— cross curves of stability.
Documentation of wind forces
The documentation may either be a report from a wind tunnel
test carried out by a recognised institute or detailed calculation
carried out in accordance with the recommendations of the rel-
evant regulations. The documentation of the wind tunnel test
and the detailed calculations shall contain a detailed and recog-
nisable description of the model. The wind forces should be
documented from the lightest draught up to the maximum op-
erational draught. The wind forces should be documented for
heeling angles from upright position and to at least 30 degrees
with steps not exceeding 10 degrees. For ship shaped units it is
sufficient to determine the wind forces at the upright position
and assume the forces to vary as a cosine function of the heel-
ing angle. Horizontal surfaces, such as helicopter deck should
be taken into account. For units of an arbitrary shape, where
both the stability particulars and the wind forces vary with the
attacking angle, the wind forces shall be determined for the
range of attacking azimuth angles about the unit from forward
to aft in steps not exceeding 15 degrees. The wind forces
should normally be determined when the unit is assumed free
floating, i.e. uprighting effects from anchoring etc. shall not be
taken into account. For units equipped with dynamic position
keeping system, the heeling forces shall take into account the
adverse effect of the thruster system. I.e. the wind forces are
assumed to act about the centre of the thrusters.
Documentation of compliance with intact stability criteria
A summary table showing the results of intact stability calcu-
lation covering a draught range from light ship and to the max-
imum operational draught. The summary table should indicate
the main results for each azimuth angle, compliance with each
criterion and reference to the detailed results, preferably in-
cluded as an appendix. 100 knots wind speed shall be applied
for severe storm conditions and 70 for operational and transit
conditions. If a specific severe storm draught has not been
specified, 100 knots shall be used for the complete draught
range.
Documentation of compliance with damage stability criteria
A summary table showing details of the most severe damage
cases at each draught, including azimuth angles and covering
the draught range from lightship to the maximum operational
draught. For column stabilised units the damage stability
should normally be documented at the fixed draughts only,
such as at the transit and operational draught. The detailed re-
sults from the damage stability calculations should be included
as an annex to the report. The results from the detailed calcu-
lation of damage stability should at least consist of plot of each
damage case, plot of righting lever (GZ)-curves and wind heel-
ing arm. Flooding angles shall be indicated on the plots.
Ballasting curves
For column stabilised unit, the severe storm draught may be
different from the transit draught and the operational draught.
Maximum allowable VCG curves shall be developed, on the
basis that the unit can reach the severe storm draught by use of
ballast water only, i.e. without relocation or dumping of fixed
loads. If the unit is operating in a geographic location where
the weather conditions do not annually or seasonally become
sufficiently severe to require a unit to go to a severe storm con-
dition relocation of fixed loads may be accepted if the detailed
procedures are included in the stability manual (B050 or
B060).
Resulting maximum allowable VCG curve
The resulting maximum allowable VCG curve should be plot-
ted in an easily readable format. Any limitations, such as tanks
to be kept full at given draughts, lowering of legs etc, shall be
clearly stated.
2.2.3 B030 – Inclining test and lightweight survey proce-
dure
When the unit is completed an inclining experiment shall be
carried out in order to determine the correct weight and centres
of gravity. The procedure for the inclining test should contain
details on the following:
— time and place
— loading condition at the test. It is of imperative importance
to avoid draughts at which the waterplane area changes
significantly during the inclining. The loading condition
should have as few slack tanks as possible. Empty tanks
should be completely dried
— the shifting procedure
— the pendulum arrangement
— draught reading procedures
— estimated foreign and missing weights.

DET NORSKE VERITAS
Page 7
For a series of sister units, a lightweight survey may be accept-
ed in lieu of an inclining test. This will depend on:
— type of unit
— time span of building
— whether the units are built for the same owner
— dissimilarities between the units
— approved inclining test of the first unit
— unaccounted difference in lightweight data from the esti-
mate and the lightweight survey should not exceed 1%
— unaccounted difference in lightweight data from the in-
clining test and the lightweight survey should not exceed
1%.
The procedure for the lightweight survey is the same as for the
inclining test except inclining weights, shifts and pendulums.
2.2.4 B040 – Inclining test or lightweight survey report
The report shall contain the actual records from the inclining
test or lightweight survey as well as the following calculations:
— displacement corrected for draught, trim, sagging and hog-
ging and for actual seawater density
— foreign, missing and mislocated weights and their position
— inclining moments and the corresponding heeling angles
(only for inclining tests). This shall be presented in form
of a table and a diagram
— calculation of metacentric height (GM) based on the least
square method (only for inclining tests)
— calculation of lightweight data; weight, longitudinal center
of gravity (LCG) and VCG (VCG only for inclining tests).
For sister units, if the difference between lightweight data is
sufficiently small and within the accuracy or tolerance of in-
clining tests or lightweight surveys (difference in lightweight
is within 0.5% and difference in LCG is within 0.5% of the
length between perpendiculars), the lightweight data of the
first units may be used for the sister unit; i.e. identical final sta-
bility documentation may be accepted for the sister unit as for
the first unit.
2.2.5 B050 – Preliminary stability manual
The following is the general contents of the preliminary stabil-
ity manual. This content shall be adjusted in accordance with
the requirements of rules and regulations.
Main particulars
The unit's identification, main dimensions, maximum draught,
maximum trim and service information. A copy of the general
arrangement plan (Z020) shall be included.
Rules and regulations
Reference to the rules and regulations that are basis for approv-
al and brief list of the corresponding stability requirements.
Stability model
Sketch of volumes contributing to buoyancy in intact and dam-
age stability calculations.
Reference system and baseline
These shall be clearly defined and maintained throughout the
stability manual.
Lightweight data, preliminary
Based on estimation or data from sister unit.
Deadweight data
Weights and position of gravity centre of typical dead-weight
groups or items to facilitate calculation of loading conditions
such as “consumables departure”, “consumables arrival” or
standard cargo loads, etc.
Tank data
Plan for spaces and tanks (H040) with following information
on each tank:
— tank name and number
— type
— volume
— centre of gravity and its maximum free surface effect.
Guidance note:
The plan for spaces and tanks is also part of the design basis for
structural design, see H040.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
Draught marks
The position of draught marks and an explanation how to cal-
culate from draught readings the corresponding draught to be
used in tables for hydrostatic data, cross curves and VCG limit
curves.
Hydrostatic data
The hydrostatic data shall be presented on extreme draught ba-
sis in tabular form, from lightweight draught to above maxi-
mum draught with steps not exceeding 0.10 m.
In cases where the unit is intended to operate with trim, the hy-
drostatic data must cover the trim range. Alternatively, trim
correction tables shall be included.
The following hydrostatic data shall be presented:
— displacement moulded (m3)
— displacement extreme (tonnes)
— tonnes per centimetre immersion
— vertical centre of buoyancy
— longitudinal centre of buoyancy
— transverse metacentre
— longitudinal metacentre.
Watertight integrity
Position of non-weathertight openings or margin line used for
intact and residual damage stability calculations.
Position of non-watertight and unprotected openings used for
stability calculations.
The external watertight integrity plan (B080) and the internal
watertight integrity plan (B090) shall be included.
Limit curves or maximum allowable VCG curves, general
The draught reference point shall be same as for hydrostatic
data.
The limit curves may be presented on an extreme draught or
displacement basis in tabular or curves form from lightweight
draught to maximum draught.
In cases where the unit is intended to operate with trim, the
limit curves must cover the trim range.
The limit curves shall satisfy all stability requirements of the
rules and regulations.
Any limitation or conditions related to the application of the
limit curves shall be clearly stated on the curves.

DET NORSKE VERITAS
Page 8
Limit curves or maximum allowable VCG-curves, column-sta-
bilised units
The allowable VCG-curve shall reflect the lowest VCG-values
obtained for the most critical heeling axis at each draught. The
unit shall be assumed free to trim when heeled.
In cases where a change in draught is necessary to reach the
survival draught, ballasting and deballasting curves should be
worked out and included in the stability manual as follows:
Curve A: Ballasting from transit draught to survival draught
Curve B: Deballasting from operating draught to survival
draught.
For column stabilised units, these curves should be based on
ballasted or deballasted water at half the pontoon height and
possible transfer of mud. Curves A and B shall be regarded as
the final maximum allowable VCG-curves for checking the ac-
tual loading conditions. The ballast curve A and B may be de-
rived by taking into account the actual changes in loading
conditions brought about by the change in the operating mode
such as change in mooring loads, removal of hook load, dis-
connection of marine riser, etc., provided that such underlying
assumptions are clearly stated.
Maximum allowable VCG-curves, self-elevating units
For self-elevating units, it is normally only relevant to draw
curve I and curve II, as described above. Curve I covers the
field move conditions, while Curve II together with the curve
developed from damage stability requirements covers the
ocean tow conditions.
Special loads and moments
Special loads such as ice loads and crane loads, shall be pre-
sented as required by the rules and regulations.
Loading conditions
The presented loading conditions should include the standard
loading conditions required by the rules and regulations. For a
column stabilised unit the following conditions should be pre-
sented:
— transit condition with maximum deck load and anchors on-
board
— severe storm condition from transit, same distribution of
loads except ballast water
— operational condition with maximum deck load and equip-
ment in the most unfavourable position
— severe storm condition from operational condition (same
distribution of loads except ballast water, the marine riser
disconnected and a reasonable amount of drill pipes stored
in the derrick)
— same as above with ice load.
Self-elevating unit:
— maximum loaded for ocean tows
— maximum loaded for field moves
— same as above with ice loads.
Drill ship:
— departure fully loaded with maximum deck load (100 %
consumables)
— arrival fully loaded with maximum deck load (10 % con-
sumables)
— moored at the field, alternatively dynamically positioned
Oil storage unit:
— recommended loading and offloading sequences
Any other kind of unit:
— loading conditions reflecting the most onerous loading of
the unit consistent with the intended operational practice
The presented loading conditions should cover the intended
range of service modes including the most unfavourable load-
ing conditions.
The presented loading conditions should be within the limit
curves.
The following minimum information should be given for each
loading condition:
— individual weights, centre of gravity and free surface mo-
ment for slack tanks
— total weight and corrected centre of gravity
— extreme draughts and total trim
— corrected GM
— maximum allowable VCG or minimum required GM. GZ
curves should be plotted.
A summary of the loading conditions shall be presented in a
tabular form giving information above except individual
weights and GZ curves.
Lightweight definition and forms for lightweight recording
The estimated lightweight data and definition should be in-
cluded together with blank forms and instructions for continu-
ous follow up on lightweight alteration.
Guidance note:
This item does not have to be presented for preliminary approval,
but should be included in the final stability manual (B060).
General procedures for deballasting or counterflooding in
case of damage
General procedures in case of damage should be indicated.
These may be simple guidelines such as advice on emptying
loaded tanks in the vicinity of the damage, closing of doors,
etc.
Guidance in determining the cause of unexpected list
General procedures should be given in order to avoid that cor-
rective measures are taken before the consequences are prop-
erly considered.
Notes on stability
— general precautions against capsizing
— instructions on checking the stability
— free surface correction
— use of limit curves
— stability limitations regarding loading of the unit
— instructions on emergency situations (storm or damage).
Table 2-1 Limit curves or maximum allowable VCG-curves,
column-stabilised units
Curve Conditions Values
I
Operation
and transit
conditions
Maximum VCG-values according to the in-
tact stability criteria with 70 knots wind and
damage stability criteria with 50 knots wind.
The curve should at least cover the operation
and transit draughts.
II
Survival
conditions
tact stability criteria with 100 knots wind. The
curve should at least cover the range from
maximum operation draught to minimum
storm draught.
III
Temporary
conditions,
column sta-
bilised units
tact stability criteria with 70 knots wind ex-
cept that the minimum GM-requirement is 0.3
m. The curve shall cover the whole range of
draughts

DET NORSKE VERITAS
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Guidance note:
but it must be included in the final stability manual (B060).
Worked example on stability
A complete worked example on calculating and checking the
stability of a loading condition
Guidance note:
Blank stability forms
Blank forms for calculating and checking the stability for actu-
al loading conditions.
Guidance note:
Deadweight scale
Guidance note:
Conversion tables
Guidance note:
2.2.6 B060 – Final stability manual
The final stability manual should have the same content as the
preliminary stability manual, however updated with respect to
the approved lightweight data.
2.2.7 B070 – Lines plan and offset tables
The following drawings should be included:
— offset tables
— body plan
— profile (elevation)
— lines plan (waterlines).
The following information should be included:
— definition of base line or reference system
— stations or frame spacing
— appendages, both positive and negative
— superstructure and deckhouses contributing to buoyancy
in intact or damage stability calculations.
2.2.8 B080 – External watertight integrity plan
The plan should contain information on all external openings
(air pipes, ventilators, hatches, doors, etc.) of volumes affect-
ing stability calculations.
The following information should be shown on the plan:
— position of opening (longitudinal, transverse and vertical)
— type of closing appliance (watertight, weathertight or un-
protected)
— alarms, indicators, remote controls and signboards fitted
for each opening or closing appliance
— spaces that each opening leads to
— beach lines showing the extent of the weathertight zone
according to intact stability requirements and the water-
and weathertight zones according to damage stability re-
quirements should be indicated.
This information may be included in the freeboard plan
(B100).
2.2.9 B090 – Internal watertight integrity plan
The plan should contain items affecting damage stability cal-
culations, such as internal subdivision, possibility of progres-
sive flooding from one compartment to another through
internal openings, pipes, tunnels or ventilation ducts and pipes,
ducts, tunnels in the damage penetration zone specified in the
damage assumptions.
The following information should be shown on the plan:
— internal watertight boundaries, e.g. bulkheads, decks and
tunnels
— internal openings in these boundaries, e.g. doors, hatches,
stairways and ventilation ducts
— spaces each opening leads to (for ventilation ducts)
— type of closing appliance, e.g. doors, hatches and valves
— alarms, indicators, remote controls and signboards fitted
for each opening or closing appliance
— marking of the damage penetration zone, as specified in
the damage assumptions, on various waterlines or decks
and cross sections
— pipes, ducts, tunnels in the marked damage penetration
zone and spaces where these lead to
— design pressure heights for watertight bulkheads and
decks.
2.2.10 B100 – Freeboard plan
The freeboard plan shall provide a drawing of and information
about the following:
— deepest draught according to ILLC 1966 certificate
— waterline showing equilibrium position at first intercept
between righting and wind heeling moment curves in dam-
age condition
— waterline according to area requirement of righting and
wind heeling moment curves, either in intact or damage
condition, whichever is most severe
— parts of the structure that are included in the buoyancy vol-
umes
— location of:
— doors
— side scuttles and windows
— hatches
— ventilators
— air pipes
— openings in sides
— scuppers and sanitary discharges and garbage chutes
— operation of valves for sea inlets and outlets
— freeing arrangements
— guard rails and bulwarks
— gangway, passageway, under deck passage and life
line
— ports in sides, bow and stern.
2.2.11 B110 – List of watertight and weathertight items
A list of external openings and their closing appliances, includ-
ing:
— type of closing appliance, e.g. watertight, weathertight or
not protected
— position of openings given by longitudinal, transverse and
vertical co-ordinates
— vertical distance from lower edge of opening to the most
severe waterline, damage or intact.

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2.3 Discipline C – Mechanical
2.3.1 C020 – Design criteria
Dimensioning criteria, e.g.:
— applied loads, static and dynamic
— rating with respect to power, temperature, pressure, etc.
— environmental conditions.
2.3.2 C030 – Assembly or arrangement drawing
A drawing showing how the parts of a mechanical assembly
are arranged together.
2.3.3 C040 – Detailed drawing
A drawing showing the scantlings and arrangement of the ob-
ject. Material specifications shall be included on the drawing,
or a reference shall be made (see M020 and M040).
For important components of welded construction, full details
of joints, welding procedure, filler metal particulars and heat
treatment after welding shall be specified.
2.3.4 C050 – Design analysis
A document providing:
— objectives
— premises
— assumptions
— conclusions
relating to analysis of:
— static strength
— dynamic strength
— vibration.
2.3.5 C060 – Non-destructive testing (NDT) methods,
extent and criteria
A document describing the methods, extent and criteria for the
non-destructive testing that shall be performed.
2.4 Discipline D – Drilling
drilling discipline.
2.5 Discipline E - Electrical
2.5.1 E020 – Overall single line diagram
A diagrammatic drawing showing:
— distribution system layout including identification of all
switchboards and distribution boards
— system voltages and system earthing
— number and rating of generators. If a prime mover is also
used for driving other machinery, this shall be stated on
the overall single line diagram
— number and rating of earthing resistors or earthing trans-
formers in the distribution system
— number and rating of all transformers in the distribution
system
— number and rating of any major consumers
— rating and short circuit strength (peak value at half period
and symmetrical root mean square) for all switchboards in
the distribution system
— values from system calculations, see documentation type
E110 (short circuit currents, harmonic distortion when
more than 20% of the connected generator capacity is fed
to semiconductor assemblies, voltage drop when a motor
rated above 30% of feeding the generators’ power is start-
ed directly on line).
2.5.2 E030 – Principal cable routing sketch
A sketch showing the principal cable routing, including princi-
pal routing to redundant consumers and routing of emergency
power distribution in relation to normal power distribution to-
gether with information on fire divisions and high fire risk ar-
eas. The information shall be presented as a principal sketch,
not as detailed drawings for all cable routings.
2.5.3 E040 – Cable selection philosophy
A document stating criteria for selection and dimensioning of
cables with respect to types and sizing for different voltage lev-
els and cable lengths.
2.5.4 E050 – Alternating current (AC) power consump-
tion balance
A document stating the calculated design values for power
consumption and available power for operational modes as:
— normal operation
— manoeuvring
— special operations, e.g. dynamic positioning, thruster as-
sisted position mooring, crane operations, cargo handling
and drilling
— emergency.
Tripping of non-important consumers shall be identified in the
calculation. Load factors may be used in order to adjust in-
stalled power to anticipated consumed power. Diversity fac-
tors adjusting intermittent consumption to a mean value shall
not be used.
2.5.5 E060 – Alternating current (AC) power consumer
list
Separate lists of power consumers for:
— essential services
— important services
— emergency services.
with notation of connected switchboards and with indication of
redundant equipment.
Battery chargers and uninterruptible power supplies shall be
listed with full charging current added to the connected con-
sumption.
2.5.6 E070 – Direct current (DC) power consumption bal-
ance
A document stating the calculated design values for battery ca-
pacities for direct current (DC) and uninterruptible power sup-
plies, with operational modes as:
— normal at sea
— manoeuvring
— emergency mode.
Tripping of non-important consumers shall be identified in the
calculation.
2.5.7 E080 – Direct current (DC) power consumer list
A list of battery and UPS supplied consumers with indication
of redundant consumers.
2.5.8 E090 – Discrimination analysis
A document describing the discrimination for all feeders in the
distribution system including list of all settings of protection
for short circuit, overcurrent and earth fault. This calculation
shall include main switchboards, main distribution boards and
incomers on distribution boards. The analysis shall state max-
imum and minimum short circuit currents as well as the gener-
ator’s decrement curve. If documented by graphical diagrams,
these values shall be shown on the diagrams.

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2.5.9 E100 – Table of Ex-installation
A table with compiled information for all equipment that shall
be installed in hazardous areas, or areas that may become haz-
ardous by accidental release of explosive gas. The information
listed in Table 2-2 shall be included:
Guidance note:
Certified safe machines and equipment shall also comply with
the requirements to similar equipment for use outside hazardous
areas. Especially enclosure protection rating should be observed.
This is not verified by the documentation listed in this paragraph,
but on site by the site surveyor.
Guidance note:
The required documentation shall be submitted together in one
“package” making it possible to perform a complete assessment
of the measures taken to safeguard the installation in question.
The documentation shall not be submitted as single documents
for separate approval of each drawing.
2.5.10 E110 – Electrical system calculations
A document stating:
— maximum and minimum voltages from load flow calcula-
tions
— calculated short circuit values at main- and emergency
switchboards, main distribution boards and distribution
boards (peak value at half period and symmetrical root
mean square)
— calculated minimum short circuit values
— values of earth fault currents for systems with direct
earthed or resistance earthed neutral
— content of voltage harmonic distortion when more than
20% of connected load are by semiconductor assemblies
— dimensions of cables in the distribution system
— voltage drop calculations at start of large motors, e.g. a
motor rated above 30% of feeding generator or transform-
ers rated power
— battery capacity calculations for direct current (DC) sup-
plies and uninterruptible power supply systems.
Guidance note:
Values from system calculations, as well as equipment rating and
dimensions, shall be noted on the overall single line diagrams,
see documentation type E020.
2.5.11 E120 – Cable data sheet and design drawing
For cables that are not type approved:
— maker
— cable types and number of cores - conductor cross-sections
(mm²)
— cross sectional drawing
— number of strands in each conductor
— insulation thickness (mm)
— sheath thickness inner and outer (mm)
— braiding core diameter (mm)
— overall diameter (mm)
— field of application
— voltage class root mean square.
— insulating material
— insulating screening
— material inner sheath
— material outer sheath
— material outer braid
— manufacturer’s type test report.
2.5.12 E130 – Electrical data sheet, general
A document stating:
— design values for environmental conditions
— intended location onboard
— ingress protection (IP) rating
— input frequency and voltages, with tolerances
— designed short circuit strength (peak value at half period
and symmetrical root mean square)
— short-circuit current from feeding network
— requirements to cooling and ventilation.
2.5.13 E140 – Electrical data sheet, semiconductor assem-
blies
A document stating:
— description of the semiconductor device, with information
of intended use, cooling and type of semiconductor ele-
ments
— input and output voltage and frequency, with tolerances
— rating (kVA).
2.5.14 E150 – Assembly schedules and technical data
A document stating:
— internal power cable and busbar dimensions in the equip-
ment
— table with switchgear rating for power circuits: Nominal
current, ultimate breaking current Icu
— consumer ratings
— cable dimensions for outgoing cables.
Table 2-2 Ex-installation
Information ele-
ment
Description
Identification Tag number or other reference used for mark-
ing of the specific equipment. This shall be the
same in the documentation as on the physical
installation
Equipment type Descriptive title of equipment. E.g. “cable
gland”, “fire detector”
Location The zone classification for the location of the
equipment, with a reference to the hazardous
area classification drawing (G090)
Manufacturer Name and country of manufacturer
Type designation Manufacturers type designation
Certificate number Number on Ex-certificate
Certification body Institution issuing the certificate, if not obvi-
ous by the certificate number
Ex designation The Ex protection given in the certificate
Certificate details Total number of pages in certificate and infor-
mation on the appendix to the certificate
where the used variant of the equipment is
covered
Special conditions If the certificate number ends with “X” or
“U”, compliance with the special conditions
given in the certificate shall be stated
Circuit value limits For intrinsically safe circuits, the maximum
allowed values for voltage, current, power, re-
actance, inductance and/or the reactance/re-
sistance ratio shall be listed
Equipment values The values for reactance, inductance and/or
the reactance/resistance ratio for equipment
used in intrinsically safe circuits shall be listed
Actual circuit val-
ues
The total values for reactance, inductance
and/or the reactance/resistance ratio for intrin-
sically safe circuits shall be listed
TE -time For motors and transformers located in a zone
1, certified as “increased safe”, Ex-e, the TE -
time shall be listed together with the release
time of the associated short-circuit current
protection
IP-rating IP rating of the equipment

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2.5.15 E160 – Strength calculation with respect to short
circuit
A document providing calculations of the bus-bar strength.
Applicable for switchboards rated for short circuit strength in
excess of 50 kA only. Both thermal and mechanical effects
shall be considered.
2.5.16 E170 – Internal arc withstanding report
A document providing a description of switchboard construc-
tion and compartment separation, showing that the assembly
will withstand an internal arc, e.g. testing in accordance with
IEC 60298 Appendix A. Applicable for all high voltage assem-
blies.
2.5.17 E180 – Electrical schematic drawing
A schematic drawing showing the configuration of the electri-
cal circuit.
2.5.18 E190 – Switchboard layout
A drawing showing the location of instruments and devices for
operation (panel layout).
2.5.19 E200 – Lighting description
A document describing the design of normal, emergency, tran-
sitional and battery back-up lighting for all areas onboard.
2.6 Discipline F – Information technology
information technology discipline.
2.7 Discipline G – Safety
2.7.1 G020 – Risk analysis
An analysis including a systematic identification of and cate-
gorisation of risk to people, environment, assets and financial
interests. The risk analysis shall include criteria for the accept-
able levels of risk in the activities.
Guidance note:
The term risk analysis is used in a broad sense. It comprises a
number of different methods for risk analysis, both quantitative
and qualitative, of technical, operational, human and/or organisa-
tional nature. The methods for risk analysis must be selected to
answer the needs of the problems to be analysed. Several meth-
ods may be applied in parallel or in combination. Thus possible
interaction between technical, human and organisational aspects
may be revealed in the assessment of risk.
2.7.2 G030 – Emergency and preparedness analysis
A systematic procedure for the purpose of adapting the emer-
gency preparedness of the activities to the defined situations of
hazard and accident, in accordance with the specific emergen-
cy preparedness requirements for the activity in question.
Guidance note:
This is a systematic process in order to establish an emergency
preparedness designed for the characteristics and the identified
requirements for the activity concerned. Such analysis should in-
clude an assessment of a possible development of the defined sit-
uations of hazard and accident. The purpose shall arrive at the
most suitable measures to meet the specific emergency prepared-
ness requirements of the activity.
2.7.3 G040 – Design accidental load specification
A document providing a summary of loads resulting from the
dimensioning accidental events.
Dimensioning accidental event: Accidental event which ac-
cording to the defined acceptance criteria represents an unac-
ceptable risk, and which consequently serves as basis for
design and operation of installations and otherwise for imple-
mentation of the activities.
2.7.4 G050 – Fire control plan
An arrangement plan for each deck showing the location, iden-
tification and number of:
— control stations
— fire sections enclosed by “A” class divisions
— fire sections enclosed by “B” class divisions
— fire detectors
— manual call points
— fire detection centrals
— fire alarm sounders, e.g. bells or loudspeakers
— fire alarm central
— sprinkler system, including pipes, pumps, valves and out-
lets
— fire extinguishing appliances
— means of access to compartments, decks, etc.
— ventilation system, including ducts, fans, dampers, inlets
and outlets
— gas detectors.
The boundaries for and the identification of the fire areas shall
be shown.
2.7.5 G060 – Safety control plan
An arrangement plan for each deck showing the location of:
— two-way VHF radiotelephone apparatus
— radar transponders
— distress flares
— general emergency alarm system activation stations
— general emergency alarm system sounders, e.g. bells or
loudspeakers
— general emergency alarm system central
— public address system microphone stations
— public address system loudspeakers
— public address system centrals
— lifebuoys, with lights, lines and smoke signals
— lifejackets for adults and children
— immersion suits and anti-exposure suits
— survival crafts and their launching stations
— rescue boats and their launching stations
— lights for illumination of the launching stations
— line-throwing appliances
— embarkation ladders.
The symbols used shall be in accordance with IMO Resolution
A.760(18).
2.7.6 G070 – Structural fire protection drawing
A drawing including the following minimum information:
— extent and thickness of fireproofing, including description
of coating or paint for fire protection systems
— blast or firewalls
2.7.7 G080 – Source of release schedule
A schedule of release sources, i.e. points from which a flam-
mable gas, vapour or liquid may be released into the atmos-
phere, including the following information:
— physical location of source
— identification of the physical item that may leak, e.g. a
pipe flange, together with line number, tag number, etc.
— grade of release
— types of flammable gas, vapour or liquid that may leak
— possible leak (m3/h).
2.7.8 G090 – Hazardous area classification drawing
An arrangement plan for each deck showing the location and
extent of the hazardous area zones, and the location of:

DET NORSKE VERITAS
Page 13
— air intakes
— exhausts
— doors
— air locks and openings
— type of ventilation, e.g. natural, mechanical or pressurised.
2.7.9 G100 – Area safety chart or fire protection data
sheet
For each fire area, a chart detailing:
— fire area identification and location
— area classification
— type of ventilation
— expected personnel occupancy
— area enclosure and fire rating
— hazards
— types and locations of fire detectors
— types and locations of gas detectors
— location of manual call points
— location of manual release points
— active fire protection
— a matrix relating typical input signals from detectors, re-
lease points, etc. to typical output actions.
2.7.10 G110 – Escape and evacuation study
A document describing and analysing the following:
— escape and evacuation system
— methodology used in the analysis, including scenario def-
initions
— input data, e.g. number of people onboard, speed of move-
ment and capacity of evacuation means
— assumptions
— scenario assessments
— possible impacts of accidental events on personnel.
2.7.11 G120 – Dispersion study
An analysis covering gas dispersion from gas vents.
2.7.12 G130 – Escape route drawing
Arrangement drawings where the main and secondary escape
routes are shown. The following shall be identified, including
dimentions:
— escape routes and their directions
— escape route connections to other levels and areas
— compartments and their functions
— safe areas
— mustering stations
— evacuation means
— doors including opening directions
— stairs and ladders
— life saving appliances.
2.7.13 G140 – Cause and effect diagram
A matrix showing all inputs (causes) to a system and all corre-
sponding outputs (effects). This documentation type is rele-
vant for safety shutdown systems. Where more than one sheet
is necessary for the matrix, the cause and effect diagram shall
be organised according to physical areas of the unit. All causes
and effects shall be given a descriptive text, and shall be easily
traceable to the corresponding arrangement plans (Z020, Z030
and Z040), system diagrams as P&IDs (S020) and D&IDs
(V020) or overall single line diagrams (E020). Information
about fail-safe mode shall be included for all input and output
lines, see also schematic diagrams of input and output circuits
(I090).
2.8 Discipline H – Hull and structure
2.8.1 H020 – Structural design brief
A description of the intended procedures to be adopted in the
structural design of the unit. All limit states for the temporary
and operational design conditions shall be considered.
A summary of the items that should be included are listed be-
low:
Introduction
— general description of the unit, including main dimensions
and draughts
— class notations
— service life of unit
— position keeping system description
— list of rules, regulations, standards and codes, including re-
visions, that shall be used in the design process.
Description of analysis models
— global analysis models
— local analysis models
— loadcases to be analysed.
Description of analytical procedures
— evaluation of temporary conditions
— consideration of accidental events
— evaluation of fatigue loads
— air gap evaluation including locations to be considered,
damping, asymmetry factors, disturbed (radiated) wave
considerations and combined motion response
— establishment of dynamic responses, including methodol-
ogy, factors and parameters
— inclusion of ‘built-in’ stresses
— consideration of local responses, e.g. those resulting from
mooring and riser loads, ballast distribution in pontoon
tanks, etc.
— consideration of structural redundancy.
Description of the structural evaluation process
— description of procedures to be utilised for considering
global and local responses
— description of fatigue evaluation procedures, including use
of design fatigue factors, SN-curves, basis for stress con-
centration factors, etc.
— description of procedures to be utilised for code checking.
2.8.2 H030 – Design load plan
A drawing showing:
— deck uniform (laydown) loads
— major loads from heavy equipment, e.g. modules, cranes,
winches, life boat structures, flare tower, risers, etc.
2.8.3 H040 – Plan for spaces and tanks
A plan of the unit with location and identification of spaces and
tanks. Information about density, volumes, equipment weight,
centre of gravity and liquid temperature. Tank loading criteria
for all tanks, including a description of the loading system,
with :
— loading arrangements
— height of air pipes
— loading dynamics
— densities
— tank testing pressures.
2.8.4 H050 – Structural categorisation plan
A plan showing the structural categorisation of all main bear-
ing structure.

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2.8.5 H060 – Structural drawing
A drawing of the main bearing structure providing information
of geometric dimensions, scantlings, material type and grades
and corrosion addition. The drawings shall include:
— shells
— decks
— bulkheads
— longitudinal sections
— transverse sections
— frameworks
— type of welds
— inspection category, if not default category
— foundations
— details
— references to standard details (H080).
Openings such as doors, manholes and hatches shall be includ-
ed. Penetrations can be shown on separate drawings with
unique references in the main structural drawings.
Butt welds and areas with full and partly penetration welds
shall be identified in the drawings. Sizes of fillet welds may be
given as a standard for all welding with fillet welds. If welding
consumables with deposits of lower yield stress than required
in the standard, this shall be stated in the drawings.
2.8.6 H070 – Shell expansion drawing
A drawing showing the shell expansion including load and bal-
last water lines and the extent of the flat part of bottom and
sides. For class notation ICE, lines separating forward, amid-
ship and aft ice regions, displacement in fresh water and output
of propulsion machinery shall be stated.
2.8.7 H080 – Standard details
A set of drawings showing standard details used in the struc-
ture. Each detail should be identified on the structural draw-
ings (H060).
2.8.8 H090 – Design analyses
The design analyses shall document that the structure fulfils
the different design conditions. The design analyses should in-
clude:
— objective
— scope
— design basis
— calculations
— discussion of the results
— conclusion
— references.
The following types of analyses may be relevant:
Motion and hydrodynamic load analysis
A summary of those items normally to be included in the de-
sign basis:
— environmental design criteria including parameters for all
conditions, including:
— wave description, i.e. sea spectrum, steepness criteria,
maximum wave height and wave spreading function
— wind, current, snow and ice description
— design temperatures
— design criteria for temporary phase conditions including:
— limiting permanent, variable and environmental crite-
ria
— procedures associated with construction, including
major lifting operations
— essential design parameters associated with temporary
phases, e.g. mating loadcases, upending, mating weld-
up sequences, crushing tube stiffness, transit phases,
transit speed, etc.
— criteria in case of accidents
— draughts
— design criteria for the operational phase conditions includ-
ing:
— limiting permanent, variable and environmental load
criteria, including survival
— design loadcase, including global mass distribution
— draught
— designing accidental event criterias
— mooring actions
— basis information necessary for the assessment of air gap
sufficiency, including:
— a description of the requirements to be applied
— basis model test report
Global analysis
Fatigue analysis
Air gap analysis
Accidental damage analysis
Finite element analysis
— Description of the model
— geometry
— element properties, thickness and element axes
— description of loadcases
— summary and discussion of results
— concluding remarks.
2.8.9 H100 – Model test documentation
A document containing descriptions of and results from model
tests performed.
2.8.10 H110 – Equipment number calculation
For ship shaped units see Rules for Classification of Ships Pt.3
Ch.3 Sec.5.
For other units see DNV-OS-E301.
2.8.11 H120 – Loading manual
A manual describing permissible distribution of cargo and bal-
last, including calculation of still water bending moments and
shear forces
2.8.12 H130 – Docking arrangement plan
A drawing showing how the unit shall be supported while
docking. Calculated forces from blocks shall be included.
2.8.13 H140 – Fabrication specification
A document describing:
— scope, references and definitions
— selection of steels; philosophy, link to structural categories
— qualification of welding procedures and personnel
— fabrication and welding requirements
— fabrication tolerances
— non-destructive testing methods and extent
— repair.
2.9 Discipline I – Instrumentation
2.9.1 I020 – Control and monitoring system functional
description

DET NORSKE VERITAS
Page 15
— all functions incorporated in the system
— all interfaces towards other systems, including the infor-
mation carriers’ characteristics
— system hardware.
For systems that are not computer based:
— one-line diagrams.
For computer based systems:
A description of the basic software installed per hardware unit,
comprising:
— a list of all main software modules installed per hardware
unit stating names and version numbers
— a description of the communication software installed on
nodes in a network
— descriptions of application software (not program listings)
as follows:
— cross reference between the functions and the soft-
ware modules that must be operative to maintain each
function
— each module with detail level sufficient to understand
its function
— data and control flow between software modules
— configuration of the software, including priority
schemes
— switching mechanisms for redundant systems
— tools for system set-up and process equipment config-
uration
— plan for software manufacturing.
2.9.2 I030 – Control and monitoring system block dia-
gram
A drawing showing the major inter-relationships between all
parts of the system and interfaces with other systems.
2.9.3 I040 – Control and monitoring system user interface
A drawing showing:
— the physical layout and dimensions of each control station
— description of the functions allocated each keyboard or
screen
— description of individual screen views, e.g. schematics and
colour prints
— description of how menus, etc. are operated
— list of all alarms and operator messages
Where the alarms or messages are not self-explanatory, addi-
tional explanations shall be included.
2.9.4 I050 – Control and monitoring system power supply
arrangement
A drawing showing the power supply from main and back-up
source:
Electrical supply
A diagram showing connection to distribution boards, batter-
ies, converters or UPS, cable type and cross sectional area, and
fuse sizes.
Pneumatic supply
A diagram showing connection to compressors, accumulators,
reduction valves, dust filter and moisture filter, pipe ratings
and dew point.
Hydraulic supply
A diagram showing connection to hydraulic power units, accu-
mulators, pumps and filters, and pipe ratings.
2.9.5 I060 – Control and monitoring system cable routing
sketch
A sketch showing the physical routing of all cables being a part
of the system. The information shall be presented as a principal
sketch, not as detailed drawings for all cable routings.
The sketch shall also show how the requirements to ensure
electromagnetic compatibility (EMC) are implemented with
respect to cable shielding, separation and routing.
2.9.6 I070 – Instrument list
A list stating for each key component :
— system
— name of manufacturer
— type, etc., necessary to identify the component
— working range
— set points
— cross reference identification (tag number) to system dia-
grams as P&IDs (S020) and D&IDs (V020)
— reference to type approval certificate
— reference to Ex certificate.
2.9.7 I080 – Instrument data sheets with environmental
specifications
Data sheets showing for each key component conformance
with the requirements for environmental conditions.
2.9.8 I090 – Schematic description of input and output
circuits
For each type of input and output device, a typical electrical
schematic drawing. For each individual input and output de-
vice, information about fail-safe mode, i.e. normally energised
(NE) or normally de-energised (NDE) operation and what kind
of line monitoring that is implemented, e.g. line break, short
circuit or earth fault.
2.10 Discipline J – Marine operations
marine operations discipline.
2.11 Discipline K – Inspection
2.11.1 K020 – Facility plan for in-service inspection
The plan shall show the types of facilities which are or will be
provided to make important structural parts accessible for sur-
vey in accordance with the in-service inspection programme.
2.12 Discipline M – Materials
2.12.1 M020 – Material specification, metals
— production process, delivery condition and chemical re-
quirements
— mechanical testing and requirements
— inspection and non-destructive testing
— repair
— dimensions and tolerances
— surface protection
— certification and marking.

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2.12.2 M030 – Material specification, fire related proper-
ties
A document describing fire related material properties.
2.12.3 M040 – Material specification, non-metallic mate-
rials
— chemical composition
— delivery conditions
— production process
— testing and requirements
— inspection and non-destructive testing
— repair
— dimensions and tolerances
For reinforced materials, e.g. glass fibre reinforced plastics, in
addition:
— type of reinforcement and production process for reinforc-
ing material
— production process of finished, composite material
— inspection and non-destructive testing of finished, com-
posite material
— repair
— dimensions and tolerances of finished material
2.12.4 M050 – Coating specification
— coating types, material and manufacturer’s technical data
sheets comprising requirements to surface preparation and
application, and safety data sheets
— definition of coating system, including number of coats
and minimum and maximum variation in dry film thick-
ness
— surface preparation, including preparation of edges and
welds, surface cleanliness standard (e.g. blast cleaning to
Sa 2.5 as defined by ISO 8501-1) and roughness
— maximum allowable air humidity in relation to air and
steel temperatures during surface preparation and coating
application
— control and inspection procedures, including acceptance
criteria, tests (e.g. surface cleanliness, film thickness and
temperature control) and handling of deviations from
specified quality
— allocation scheme, describing what type of coating to be
applied where, including colours.
2.12.5 M060 – Cathodic protection specification, calcula-
tion and drawings
— areas to be protected, main structures and attached metal-
lic components (m2)
— stipulated protective current density demand (mA/m2) for
coated and not coated surfaces respectively, and total cur-
rent demand (A) in initial condition and at the end of the
design life, based on a recognised standard
— target design life of cathodic protection system
— anode material and manufacturer
— drawings of cathodic protection systems, showing anode
types, mass, distribution, location and attachment details
for sacrificial or impressed current anodes
— cathodic protection system drawings shall be in compli-
ance with the specification and calculations for the same.
Sacrificial anodes
— calculation of anode mass, distribution, total number, re-
sistance and current capacity in initial and final condition.
— target protective potential to be obtained in initial condi-
tion and at the end of the design life
Impressed current systems
— current capacity of rectifiers and anodes.
— reference electrodes, system control and monitoring ar-
rangement, cabling, and procedures for exchange or re-
newal of components.
2.12.6 M070 – Welding procedures
— reference to materials
— preparation
— preheating
— method and control of welding
— post-weld heat treatment
— necessary equipment to be used.
2.12.7 M080 – List of combustible mterials
A list of materials providing:
— material identification
— fire related properties (M030)
— locations
— quantities.
2.13 Discipline N – Navigation
2.13.1 N020 – Bridge design drawing
A drawing of the bridge design showing the position of navi-
gational equipment, horizontal and vertical fields of vision
from the conning position, blind sectors caused by obstructions
outside the wheelhouse within the required field of vision, and
details such as configuration of bridge wings and height of
front bulwark with windscreens.
2.13.2 N030 – Field of vision drawing
A drawing showing the vertical (in ballast condition) and hor-
izontal field of vision seen from the traffic surveillance work-
stations. Blind sectors caused by divisions between windows
and obstructions outside the wheelhouse, e.g. cranes shall be
shown shaded.
2.14 Discipline O – Operation
2.14.1 O020 – Unit operation manual
A document containing limiting operating conditions and es-
sentials related to classification. The document shall include
the following information:
Operating instructions
Instructions for operation, including precautions to be taken in
adverse weather, changing mode of operations, any inherent
limitations of operations, etc.
Operation limitations
Pertinent data for each approved mode of operation, including
functional and variable loads, environmental conditions, foun-
dation characteristics (for sea bed support units only), draft,
etc.
Any limitations on the operation of the unit or the equipment,
e.g. cranes, drilling equipment, etc.
Stability
Information shall be included as required under discipline B.

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Page 17
Ballasting system
Documentation for the ballast system and instructions for bal-
lasting and deballasting in intact and damaged conditions.
Position mooring
Limiting operating conditions and corresponding procedures
as basis for the class notation POSMOOR.
Dynamic positioning
Limiting operating conditions and corresponding procedures
as basis for the class notation DYNPOS.
2.15 Discipline P – Process
2.15.1 P020 – Flow diagram
A diagrammatic drawing including the following:
— flow summary tables for all major process streams, includ-
ing heat and mass balances
— all major control loops
— all major equipment
— pressure and temperature in major streams and equipment
— duty of drivers and heat exchangers
— tag numbers of equipment.
2.15.2 P030 – Sizing calculations
Sizing calculations for e.g. relief valves, bursting disks and re-
striction orifices.
2.15.3 P040 – Temperature calculations
Calculations of minimum temperatures in systems where low
temperatures may occur. The calculations shall document cor-
rect choice of piping and valve materials.
2.15.4 P050 – Materials selection report
Fluid corrosivity evaluation
Based on design data, the potential corrosivity of all fluids as-
sociated with production or processing of oil and/or gas shall
be assessed.
Special measures for control and monitoring of internal corro-
sion and erosion
This may include e.g. use of internal coatings or linings, chem-
ical treatment, corrosion probes and fluid analyses.
External corrosion protection
Use of paint coatings shall be specified by reference to generic
type, thickness (total and individual layers) and surface prepa-
ration.
2.15.5 P060 – Flare heat radiation study
An analysis covering
— flare capacity for dimensioning scenario
— flare tip characteristics
— methodology used in the analysis
— heat radiation calculations
— heat radiation plots.
2.15.6 P070 – Safety analysis tables
Safety analysis tables of process systems according to API
RP14C.
2.15.7 P080 – Pressure vessel integrity study
An analysis of the integrity of the pressure vessels during fire
and simultaneous depressuring.
2.15.8 P090 – Flare and blowdown system report
An analysis comprising calculations of capacity requirements,
back pressure, equipment sizing, depressurising profile, low
temperature effects, liquid entrainment, etc.
2.16 Discipline Q – Quality management
2.16.1 Q020 – Quality manual
A document stating the quality policy and describing the qual-
ity system of an organisation.
2.16.2 Q030 – Process control procedure
A procedure defining the manner of production, installation
and servicing.
2.16.3 Q040 – Document control procedure
Procedure that describes how documents are prepared, re-
ceived, numbered, identified, distributed, filed and discarded.
2.16.4 Q050 – Construction schedule
A work programme listing the activities required in the con-
struction process, defining the time and duration for each ac-
tivity and their inter-dependability. Important milestones shall
be listed.
2.16.5 Q060 – Document register
A register containing the document number and title for all
documents that are planned to be issued during a project.
The document register should be a living register also contain-
ing information on planned and real issue dates and revision
control.
2.17 Discipline S – Piping
2.17.1 S020 – System diagram (P&ID)
— equipment and components including reference identifica-
tion (tag numbers)
— size of pressure vessels and piping
— piping with line numbers
— pump type and capacity
— type of valves and connections
— type of expansion elements
— location of shutdown and isolation valves
— failure mode of control and shutdown and isolation valves
— hydrostatic test pressure after installation on board, where
required
— instrumentation, including safety devices, control and
monitoring equipment
— signal lines, sufficient to describe the function
— heat-tracing cables and insulation for pipelines, valves, in-
struments, vessels, etc.
— maximum differential pressure across centrifugal pumps
— maximum flow through pumps and compressors
— set points for all shutdown and isolation valves and rup-
ture disks.
2.17.2 S030 – Pressure drop analysis
A calculation of the pressure drop in the system during dimen-
sional operation. A comparison of the results with acceptable
limits for the pressure drop.
2.17.3 S040 – Capacity analysis
A calculation of the capacity of the system. A comparison of
the results with corresponding capacity requirements.
2.17.4 S050 – Hydraulic or pneumatic control diagram
A schematic diagram showing hydraulic or pneumatic control
lines and associated components as actuators, valves and sim-

DET NORSKE VERITAS
Page 18
ilar. The operational mode that is shown , e.g. normal operation
with pressure applied, shall be stated. The failure mode of the
components, e.g. close on loss of power, shall be stated.
2.17.5 S060 – Connections to the shell and to sea chests
Drawings showing the arrangement of the connections of pip-
ing and associated equipment to the shell and to sea chests. The
drawing shall make it possible to assess that the connections
and the associated equipment meet the requirements to struc-
tural strength and the requirements of the ILLC 1966.
2.17.6 S070 – Pipe routing sketch
A sketch showing the physical routing of the piping. The pur-
pose of the sketch is to provide an overview of the installed
piping, not detailed isometrics.
2.17.7 S080 – Pipe stress analysis
A calculation of stresses in the pipes and their supports due to
for example expansion, water hammering and surge. An as-
sessment of the pipes and their supports’ adequacy with re-
spect to structural strength and fatigue.
2.17.8 S090 – Thermal stress analysis
A calculation of stresses in the pipes and their supports due to
thermal effects. An assessment of the pipes and their supports’
adequacy with respect to structural strength and fatigue.
2.17.9 S100 – Specification of piping, valves, flanges and
fittings
A document describing for each system:
— type of pipe or component
— pipe or component design standard
— dimensions (for pipes, outside diameter and wall thick-
ness)
— design pressure
— design temperature
— materials
— corrosion protection
— test pressure
— piping class (I, II, III).
2.17.10 S110 – Line index
The line index may contain the following information:
— line number (tag code)
— P&ID document number
— stress isometric number
— fabrication and inspection isometrics
— service from tag code
— service to tag code
— test class
— test medium
— test pressure (barg)
— heat tracing oC
— insulation class
— corrosion allowance, critical line
— non-destructive testing class, calculation number
— stress calculation number
— nominal size
— density vapour or liquid
— viscosity vapour or liquid
— liquid fraction
— calculation method
— fluid
— mass flow
— compressibility
— velocity
— pressure drop calculated and allowed
— operating pressure
— design pressure
— operating temperature
— minimum and maximum design temperatures
— design temperatures
— piping class (I, II, III).
2.18 Discipline T – Telecommunications
2.18.1 T020 – Communication system functional descrip-
tion
— all functions incorporated in the system
— all interfaces towards other systems, including the infor-
mation carriers’ characteristics
— system hardware.
For systems that are not computer based:
— one-line diagrams.
For computer based systems:
A description of the basic software installed per hardware unit,
comprising:
— a list of all main software modules installed per hardware
unit stating names and version numbers
— a description of the communication software installed on
nodes in a network
— descriptions of application software (not program listings)
as follows:
— cross reference between the functions and the soft-
ware modules that must be operative to maintain each
function
— each module with detail level sufficient to understand
its function
— data and control flow between software modules
— configuration of the software, including priority
schemes
— switching mechanisms for redundant systems
— tools for system set-up and process equipment config-
uration
— plan for software manufacturing.
2.18.2 T030 – Communication system block diagram
A drawing showing the major inter-relationships between all
parts of the system and interfaces with other systems.
2.18.3 T040 – Communication system user interface
A drawing showing:
— the physical layout and dimensions of the control device
— description of the functions allocated each keyboard or
screen
— description of individual screen views, e.g. schematics,
colour prints
— description of how menus, etc. are operated
— list of all alarms and operator messages
Where the alarms or messages are not self-explanatory, addi-
tional explanations shall be included.
2.18.4 T050 – Communication system power supply
arrangement
A drawing showing the electrical power supply from main and
back-up source. The drawing shall show the connection to dis-
tribution boards, batteries, converters or UPS, cable type and
cross sectional area and fuse sizes.
2.18.5 T060 – Communication system cable routing
sketch
A sketch showing the physical routing of all cables being a part
of the system. The information shall be presented as a principal
sketch, not as detailed drawings for all cable routings.

DET NORSKE VERITAS
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The sketch shall also show how the requirements to ensure
electromagnetic compatibility (EMC) are implemented with
respect to cable shielding, separation and routing.
2.18.6 T070 – Communication system data sheets with
environmental specifications
Data sheets showing for each key component conformance
with the requirements for environmental conditions.
2.19 Discipline U – Subsea
subsea discipline.
2.20 Discipline V – Heat, ventilation and air condi-
tioning
2.20.1 V020 – System diagram (D&ID)
A diagrammatic drawing including:
— equipment and components including reference identifica-
tion (tag numbers)
— ductwork with duct numbers, size and insulation
— fan type and capacity
— type of dampers
— instrumentation, including safety devices, control and
monitoring equipment
— signal lines, sufficient to describe the function
— connections to other systems e.g. sea water, heating medi-
um, drain, etc.
2.20.2 V030 – Pressure drop analysis
A calculation of the pressure drop in the system during dimen-
sional operation. A comparison of the results with acceptable
limits for the pressure drop.
2.20.3 V040 – Capacity calculation
A calculation of the capacity of the system. A comparison of
the results with corresponding capacity requirements.
2.20.4 V050 – Hydraulic or pneumatic control diagram
A schematic diagram showing hydraulic or pneumatic control
lines and associated components as actuators, valves and sim-
ilar. The operational mode that is shown must be stated, e.g.
normal operation, with pressure applied. The failure mode for
the components must be stated, e.g. close on loss of power.
2.20.5 V060 – Duct routing sketch
A sketch showing the physical routing of the ducts. The pur-
pose of the sketch shall provide an overview of the installed
ducts, not detailed isometrics.
2.20.6 V070 – Penetration drawings
A drawing including material specifications showing typical
arrangements of penetrations for ventilation ducting, pipes or
cables through fire divisions.
2.20.7 V080 – Flow diagram
— reference identification (tag numbers) for supply and ex-
tract fans
— flowrates for supply and extract fans
— temperature requirements for all serviced areas.
2.21 Discipline W – Soil and foundation
2.21.1 W020 – Typical soil conditions
A document describing the range of typical soil conditions for
which the unit is intended for. The type of soil and the range of
shear strength and stiffness parameters shall be included.
If the unit is intended for a specific location, a soil investiga-
tion report (W030) shall be submitted instead.
2.21.2 W030 – Soil investigation report
A report providing a description of the soil investigations per-
formed on a specific location. An interpretation of the results
of the investigation towards soil design parameters, such as
general classification parameters, shear strength parameters,
deformation properties and other parameters for the foundation
type and design.
2.21.3 W040 – Pile foundation design
— soil resistance models for axial and lateral resistance
— total axial capacity
— pile response to acting loads, accounting for interaction ef-
fects with unit
— pile installation studies including pile driveability analy-
ses.
2.21.4 W050 – Gravity foundation design
— stability of foundation
— settlements and displacements
— penetration of skirts
— soil reactions on foundation structure
— soil modelling for dynamic analysis
— filling of voids (under base grouting).
2.21.5 W060 – Anchor foundation design
Pile anchors
Position and orientation of padeye, installation performance,
tolerances to verticality, holding capacity (axially and lateral-
ly) and required pretension for pull-in of anchor line in soil.
Gravity anchors
See gravity foundation design (W050)
Suction anchors
Position and orientation of padeye, installation performance,
i.e. required suction, tolerances to verticality, holding capacity
(axially and laterally) and required pretension for pull-in of an-
chor line in soil.
Fluke anchors
Holding capacity, required installation pretension load and es-
timated installation drag length.
Drag-in plate anchors
Holding capacity, required installation pretension load and es-
timated installation drag length.
Other types of plate anchors
Installation procedures, anchor performance during installa-
tion and holding capacity.
2.22 Discipline Y – Pipeline
pipeline discipline.
2.23 Multidiscipline Z
2.23.1 Z020 – General arrangement plan
A drawing showing the unit’s main dimensions, frame spac-
ings and layout. For each deck, all rooms and all major equip-
ment shall be identified. Side and front views shall be
included.

DET NORSKE VERITAS
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2.23.2 Z030 – Local arrangement plan
A drawing showing the main dimensions and layout of a lim-
ited area, e.g. the engine room. All rooms and major equipment
shall be identified by room number or tag number and name.
Side views shall be included. The global location of the area
shown on the drawing shall be indicated on a miniature general
arrangement plan.
2.23.3 Z040 – System arrangement plan
A drawing showing the physical layout of a system, e.g. the
ballast system. All major equipment being part of the system
shall be identified by tag number and name.
2.23.4 Z050 – Unit specification
The specification of the unit being referred to by the contract
between the owner and the builder.
2.23.5 Z060 – System design philosophy
A document stating:
Design basis
Rules, regulations, standards and codes with assigned priori-
ties.
System and interfaces
— a description of all functions that are assigned to the sys-
tem, and all interfaces to other systems
— requirements to the system in order to maintain an accept-
able level of safety
— dangerous operations and requirements to corresponding
manual actions
— requirements to maintenance
— life cycle related aspects.
Dangerous events
A description of the safety functions incorporated in the sys-
tem that shall prevent or limit the consequences of dangerous
events.
Shut down
— description of shut down philosophy
— assessment of the safest status for the system and associat-
ed equipment in case of failures in the shut down systems
operating on the system
— consequences for electrical, pneumatic and hydraulic cir-
cuits, i.e. selection of normally energised versus normally
deenergised circuits.
2.23.6 Z070 – System functional description
— all functions incorporated in the system and their technical
realisation
— all interfaces towards other systems, including their tech-
nical realisation.
2.23.7 Z080 – Failure mode description
A document describing the effects due to failures in the sys-
tems, not failures in the equipment supported by the systems.
The following aspects shall be covered:
— list of failures which are subject to assessment, with refer-
ences to the system documentation
— description of the system response to each of the above
failures
— comment to the consequence of each of these failures.
2.23.8 Z090 – Reliability and availability analysis
A document providing a qualitative, and a quantitative analysis
of the reliability and availability of the system. The qualitative
analysis may be the result a hazard and operability study
(HAZOP).
2.23.9 Z100 – Equipment list
A list stating for each key component :
— system
— name of manufacturer
— type, etc., necessary to identify the component
— main characteristics, e.g. pressure rating and power con-
sumption
— cross reference identification (tag number) to system dia-
grams as P&IDs (S020) and D&IDs (V020)
— reference to type approval certificate
— reference to Ex certificate.
2.23.10 Z110 – Specification
A document describing the design basis and technical specifi-
cation for a product.
2.23.11 Z120 – Data sheet
A schematic document providing quantified technical parame-
ters for a product, e.g. pressure rating, together with other spe-
cific attributes, e.g. Ex classification..
2.23.12 Z130 – Test procedure at manufacturer
A document describing all tests that shall be carried out at the
manufacturer's works together with acceptance criteria for
each test. The tests shall cover all functions covered by the sys-
tem and all normal failure modes.
2.23.13 Z140 – Report from test at manufacturer
A document describing all results, and limitations to the tests
performed.
2.23.14 Z150 – Test procedure for quay or sea trial
A description of all tests that shall be carried out at the quay or
sea trial together with acceptance criteria for each test.
2.23.15 Z160 – Report from quay or sea trial
A document describing all results, and limitations to the tests
performed.
2.23.16 Z170 – Operation manual
A document intended for regular use on board, providing in-
formation on:
— operation modes
— operating instructions for normal and degraded operating
modes
— details of the user interface
— transfer of control
— redundancy
— test facilities
— failure detection and identification facilities, automatic
and manual
— data security
— access restrictions
— special areas requiring user attention
— procedures for start-up
— procedures for restoration of functions
— procedures for data back-up
— procedures for software re-load and system regeneration.
2.23.17 Z180 – Installation manual
A document providing information about the installation pro-
cedures.
2.23.18 Z190 – Maintenance manual
A document intended for regular use on board providing infor-
mation on:

DET NORSKE VERITAS
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— maintenance and periodical testing
— acceptance criteria
— fault identification and repair
— list of the suppliers' service net.
2.23.19 Z200 – List of signboards
A list of all signboards to be installed, including the corre-
sponding signboard texts. A reference to the applied rules, reg-
ulations, standards or codes.
2.23.20 Z210 – Environmental regularity number (ERN)
calculation
A calculation of the environmental regularity number accord-
ing to Rules for Classification of Ships Pt.6 Ch.7 Sec.6.

DET NORSKE VERITAS
Page 22

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