The document describes the design of an ultra deep water rigid and flexible pipelay/heavy lift/DP3 construction vessel. Some key details include: It is 178 meters long with a breadth of 46 meters and draft of 15.6 meters. It can accommodate 239 people and has a deadweight of 11,000 tons. It is equipped with a 3000 ton crane, 1200 ton reels, 1250 ton carousels, and dynamic positioning system. Extensive analyses and testing were performed to optimize the hull design and ensure operational safety in various sea states.

1. DESIGN OF ULTRA DEEP WATER RIGID &
FLEXIBLE PIPELAY/ HEAVY LIFT/ DP3
CONSTRUCTION VESSEL
BY
DEBABRATA BANERJEE & ANIRUDDHA SEN
NAVNAUTIK PTE LTD, SINGAPORE
SUBSEA VESSEL OPERATIONS CONFERENCE, OSLO
17 & 18 APRIL 2013
1

2. PRINCIPAL PARTICULARS
Length Overall........................178.0 m
Breadth Moulded...................46.0 m
Depth Moulded.......................15.6 m
Draft (Max)..............................10.5 m
Deadweight.........................11,000 T
GRT.......................................48,500 T
NRT............................................TBA
Target Speed…………………………12 knots
CLASSIFICATION NOTATION
DNV 1A1 Ship Shaped Pipelaying Vessel,
Dynapos Autro, ICE-1A, Clean DESIGN,
Held-SH, Crane, EC0, BIS, COMF (V3, C3),
NAUT-OSV (A)
Flag...................................Panama
2

3. 3
3000T
CRANE
MLS
TOWER
CAROUSEL COMPT A&R COMPT
ADJUSTER
ARMS
CARGO DECK
Deck Area..4,200 m2
(without reels)
Deck Strength...10.0 T/m2
ACCOMMODATION
Single berth cabin for all
239 complements.
AMENITIES
General Workshop – 1
ROV Workshop – 1
Conference Room – 3
Office – 12
Site Office – 3
Officer Recreation Room – 1
Crew Recreation Room – 1
Officer Mess-1
Crew Mess – 1
Gymnasium – 1
Prayer Room – 1
Hospital – 1
Treatment room – 1
SAFETY EQUIPMENT
Life Boat...2 x 120 persons
Life Raft..... 6 x 20 persons
Rescue Boat……2 nos
(6 person capacity each)
Davits………….4 nos.
HELIDECK
Dimensions-27.5m x27.5m
(Sikorsky S-92/S-61N)
MLS PIPE LAYING & 3000T
CRANE PACKAGE PROVIDED
BY HUISMAN EQUIPMENT B.V.
1200T
REEL
ROV
COMPT 4 GENSET ROOMS 2 BT COMPTS
SWBD ROOMS AUX M/C ROOM
VESSEL OVERVIEW

4. 4
ISOMETRIC VIEWS OF THE VESSEL

5. (A) DESIGN PHILOSOPHY BEHIND BASIC DIMENSIONS OF THE
VESSEL
Recommended Dimensions:
L=215m X B=50m X D=18m
CONSTRAINT FACED DURING DESIGN
Length restriction to suit owner’s
requirement.
Hence Final Dimensions:
L=178m X B=46m X D=15.6m
5
PHOTO COURTESY: EMAS-AMC & SOFEL

6. HULL FORM
• Hull form was
adopted from
Navnautik’s earlier
proposal (Model &
ICE tested in MARIN
& HSVA) of an 180m
submersible heavy
lift vessel.
• With some
modification the
parameters matched
the basic
requirement
6
PHOTO COURTESY: MARIN

7. MODEL TESTING
7
 Resistance &
propulsion tests
were conducted in
VTT Technical
Research Centre –
Helsinki (FINLAND)
 ICE Testing was
conducted in Aalto
University ICE
Technology
Laboratory Helsinki
(FINLAND)
 Minimum propulsion
power during ice
navigation has been
approved by DNV.
PHOTO COURTESY: VTT & AALTO

8. STRUCTURAL DESIGN - GLOBAL
 Ship’s dimensional ratios are outside
classification rule recommendation.
 DNV Pt3.Ch.1Sec.5 states that: “special
considerations will be given to vessels
with the following proportions:
 L/B < 5 (178/46 = 3.9)
 B/D > 2.5 (46/15.6 = 2.9)
As a result the vessel structure had to be
analyzed to comply to both:
1. Rule based design requirement.
2. Fundamental Global structural Finite
Element Analysis based on global
motion analysis on the basis of
worldwide wave spectrum
Longitudinal strength has been determined
by both methods as stated above &
superimposed on a single plan & an
envelope curve has been presented for
Master’s reference.
8

9. (B) STABILITY ISSUES AND THEIR COUNTERMEASURES
INTACT STABILITY
• Comply IMO Res. 267 (85)-IS Code 2008
• Able to carry any combination of:
4 nos. loaded reels (22m dia) 2200mt each on deck
2 nos. loaded carrousels 1250mt each inside the hull and full consumables
• Tank Capacity - Fuel Oil 2000m3 and FW 1600m3
• Ice condition as per DNV Ice Class 1A
• Crane operation
Comply to DNV Pt.5 Ch.7 Sec.7 D-200 criteria (Accidental hook load drop)
DAMAGE STABILITY
Sailing & Pipelaying Operation
• Comply IMO Res. MSC 266(84) SPS Vessel-239 passengers (Probabilistic)
• Comply to DNV Pt.5 Ch.7 Sec.7 D-400 criteria (Crane damage stability)
ROLL PERIOD & HEEL CONTROL ISSUES
• Require very large metacentric height (GM) in 3000t crane operation.
• Hence in other operating conditions (pipe laying & sailing) rolling period can be short & uncomfortable.
• 3000t crane operation requires maintaining heel angle within 2.0 deg.
9

10. COUNTERMEASURES
 Five (5) “U” shaped (pneumatically controlled active) and one passive flume tank have been
incorporated to control the rolling period.
 Objective is to achieve a Roll Period of more than 11 seconds for all sailing and pipelaying condition
10
FLUME TANK

11. 11
COUNTERMEASURES contd.....
11
CROSS PIPE FOR
ANTI-HEELING TANK
U-SHAPED ANTI-
ROLLING TANK
AIR PIPES
MAIN DECK AIR PIPES
COMBINED ANTI-HEELING & ANTI-ROLLING TANK CONFIGURATION
Heel control tanks have also been provided as:-
• 3000t crane operation requires maintaining heel angle within 2.0 deg.
• In order to achieve this five (5) pneumatically controlled active Heel Control tanks have been provided.

12. 12
Global motion analysis was carried out for
crane, pipelaying and sailing/transit conditions
both in shallow and deep waters.
The objectives of the global motion analysis are:
- RAOs of vessel motions (6DOF) at CG.
- Computation of Maximum Operating Sea
States to keep all the motions and
accelerations within the prescribed limits of
equipment manufacturers
- Design response (short-term & long-term) of
vessel motions and accelerations
(longitudinal, transverse and vertical) at c.o.g
of heavy equipments and other positions for
local FEA
Hydrodynamic Meshed Model
(C) METHODOLOGY OF GLOBAL MOTION ANALYSIS
& FEA APPLIED IN THIS PROJECT

13. 13
Typical Heave RAO at CGThe limiting sea states for survival & operating
conditions for both crane and pipelaying were
arrived at, based on the operational limits
(maximum motion amplitudes & accelerations).
The Global Analyses were carried out at these
limiting sea states to ensure that the global
stresses due to combined (still water + wave)
hull girder loads are less than the permissible
limits.

14. 14
The hull girder loads are applied beside the local loads as
recommended by equipment manufacturers.
Local Finite Element Analysis
To assess strength and buckling against DNV rules, the
following structural components are analyzed by fine mesh
using Finite Element Analysis:
• 3000 T Aft Crane Foundation
• Pipelaying Tower Foundation
• Deck Reels Foundation
• Carousels & Various Sheaves Foundation
• 80T Crane Foundation
• Accommodation supporting Helideck structure
• Aft Hinged Platform
Hull Model for FEA
Typical FEA
model for MLS
moonpool
Typical FEA model
for Crane pedestal

15. DP3 CONCEPT & DESIGN BY OWNER
• The vessel has four (4) segregations instead of rule
requirement of two (2) segregations.
• Four (4) Generator Rooms
• All six Azimuth thrusters & three
Bow Thrusters are in separate compartments.
• As a result the DNV ERN Number achieved is
99,99,97 after single failure.
15
FOUR GENSET ROOMS
Main Generator
2 x MAK 12M32C @ 5760 kW
Auxiliary Generator
6 x MAK 6M32C @ 2880 kW
4 x HYUNDAI 9H25/33 @2580 kW
Emergency Generator
CAT- MODEL C32……..874 kW
Total power installed ~ 40 MW
POWERING & DYNAMIC POSITIONING
(D) SALIENT FEATURES & OPERATIONAL FUNCTIONALITIES
5760 kW
2580 kW
2580 kW
2880 kW
2880 kW

16. 16
6 MW
6 MW
2 MW 2 MW
3 MW
3 MW 3 MW
2.7 MW
2.7 MW
1.42 MW
PROPULSION, MANEUVERING AND POSITIONING
Stern Azimuth Thruster Fwd........ 2 x Rolls Royce Aquamaster,
6,000kW each
Stern Azimuth Thruster Aft.......... 2 x Rolls Royce Aquamaster,
2,000 kW each
Retractable Thruster Fwd............ 2 x Rolls Royce Aquamaster,
3,000 kW each
Bow Thrusters Tunnel Fwd......2 x Rolls Royce, 2,700 kW each
Bow Thruster Tunnel Fwd.......1 x Rolls Royce, 1,420 kW
DYNAMIC POSITIONING
DP 3 System............................................KONGSBERG

17. RIGID-LAY SYSTEM (1200T REEL x 4)
17
EQPT INFO COURTESY: HUISMAN & EMAS-AMC
Combined pipelay tower for reel lay and
flex lay over a moon pool
Pipe Outer Diameter......... Reel lay 4”-16”
Tensioners............................. 2 x 400mt
Hang-off Clamp...........................900mt
Pipe Storage....................4 x 1,200mt reels
for rigid pipe (removable)
Transverse axis ………reel skid cart + reel
drive unit
Longitudinal axis…….reel skid cart
REELING CAPACITY FOR 4 REELS
• 8” pipe ~ 64km
• 10” pipe ~ 48km
• 12” pipe ~ 36km
• 14” pipe ~ 24km
• 16” pipe ~ 16km

18. SIZE DOES MATTER!!
CREW
EQPT INFO COURTESY: HUISMAN
MLS TOWER-MOONPOOL
CONFIGURATION
TOP
MODULE
(ALIGNER
WHEEL)
STRAIGHTENER
(2800 kNm)
2x400t
TENSIONERS
HANG OFF
MODULE (900 T)
MOONPOOL
WITH BOTTOM
DOORS
ADJUSTER
SYSTEM
20T CRANE
18

19. 19
MOONPOOL EQUIPMENT
FOR RIGID-LAY OPERATIONS
100T INITIATION
WINCH
MOONPOOL
CRANE
60T PLET
WORKSTATION
MOONPOOL
HATCH
19
1200T
REEL
2x20T TUGGER
WINCH
MOONPOOL
CRANE
MLS TOWER
60T PLET
BIRD’S EYE VIEW FROM 3000T CRANE TOP
(ONLY RIGID-LAY ITEMS SHOWN)
MOONPOOL
HATCH
FWD

20. FLEX-LAY SYSTEM (1250T CAROUSEL x 2)
20
EQPT INFO COURTESY: HUISMAN
Combined pipelay tower for reel lay and
flex lay over a moon pool
Flex lay pipe ……………..4”–24”
Tensioners........... 2 x 260mt
Hang-off Clamp......... (flexible) 900mt
Pipe Storage..........2 x 1,250mt under-deck
carousels for flexible pipe
Carousel Spooler…….2 nos
Deck Flex Chute ……… 2 nos
Mushroom ……. 1 no.
10 T Tugger winch …….. 2 nos.
Knuckle boom crane …………. 2 nos.
(inside carousel compt)

21. FLEX-PIPE LAYING ROUTE FROM CAROUSEL COMPT
21
Deck Flex
ChuteMushroom
Carousel
Carousel
Spooler
Crane
10T tugger
winch
Carousel
Carousel
Spooler
Top
Chute
Bottom
Chute

22. ABANDON & RECOVERY (A&R) SYSTEM
22
EQPT INFO COURTESY: HUISMAN
Below main deck:-
•A & R System... 2 x 600mt
traction winches
• 2 x 20 T storage winch
•Steel Wire Rope Capacity…
3,800 m x 125 mm (Ø) each
winch
•Equaliser sheaves – 1 set
•Low Tension sheave – 2 nos
•High Tension sheave – 2 nos.
On Main deck:-
•Fairlead sheave – 2 sets
•High Tension sheave – 2 nos.
•125t Secondary A&R winch
•Steel Wire Rope Capacity…
2,700 m x 64 mm (Ø)

23. CLOSEUP VIEW FOR A&R
COMPT (BELOW MAIN DECK)
23
MAIN DECK
125T A&R
WINCH
FAIRLEAD
SHEAVE
(PIVOTING-TYPE)
HIGH TENSION
SHEAVE
600T TRACTION
WINCH
20T STORAGE
WINCH
EQUALISER
SHEAVES
HIGH
TENSION
SHEAVE
CLOSEUP VIEW FOR
MAIN DECK ITEMS
LOW TENSION
SHEAVE

24. 3000T CRANE, 80T SERVICE CRANE, 22T DECK CRANES (2 NOS)
& 30T MOONPOOL CRANE ON MAIN DECK
24
EQPT INFO COURTESY: HUISMAN
3000 T
CRANE
80 T CRANE
80 T CRANE
22 T CRANE
22 T CRANE
30T CRANE
3000 T
CRANE 1. Huisman Offshore Mast Crane
Main hoist.....3,000mt at 25m radius, 80m hook
travel
Aux. hoist....1,200mt at 30m radius, 330m hook
travel
Whip hoist...1-fall 80mt, 2,000m hook travel 2-fall
160mt, 1,000m hook travel
2. 80T Service Crane.. (static - 80T @15‘ , 25T @115‘)
/ (dynamic – 19T @ 115’, 46T @ 70’)
3. Moonpool Crane – 30T
4. Deck Cranes (2 nos) – 22 T

25. AFT HINGED PLATFORM FOR STOWAGE OF
EMPTY REEL
25
EQPT INFO COURTESY: HUISMAN
FRAMEWISE CAPTURE OF AFT PLATFORM STOWAGE
AFT PLATFORM’S REQUIREMENT
Due to lack of space on working deck during reel-skidding operations, aft hinged
platform is provided to park an empty reel. In order to reduce interference
during 3000T crane operations, the platform has been designed as a hinged
platform which can be stowed on the deck as shown below.

26.  ROV COMPARTMENT’S SECTION VIEWS
26
INFORMATION COURTESY: RAPP HYDEMA

27. 27
INFORMATION COURTESY: RAPP HYDEMA

28. 28
‘COMF (V3, C3)’ NOTATION COMPLIANCE
Noise levels
Passenger top grade cabins – 50 dB
Passenger cabins, standard – 55 dB
Public spaces – 62 dB
Open deck recreation – 70 dB
Vibration levels (in mm/s peak for single
frequency components between 5 and 100
Hz)
Passenger top grade cabins – 2.5
Passenger cabins, standard – 4.0
Public spaces – 4.0
Open deck recreation – 5.0
The environmental standards are divided in two groups:
— V Noise and vibration (Analysis carried out by DNV Oslo)
— C Indoor climate.

29. 29
Climate
Type A - Cabins
Type B - Hospital and Ward rooms
Type C - Wheel house, Control rooms, Office areas and public spaces intended for low physical activity such
as Conference rooms, Libraries, Card rooms, Seating areas, etc.
Type D - Public spaces intended for high physical activity such as Dining areas, Atriums, Gymnasiums, etc.
Space
type
Min temp
(oC)
Max Temp
(oC)
Max air
velocity
(m/s)
Min fresh air
supply qty
per person
(m3/hr)
Vertical air
temp
difference
(oC)
Relative
humidity
(%)
A 21-24 25-28 0.40 28.8 3.0 <65
B 21-24 25-28 0.35 28.8 3.0 <65
C 22-24 25-28 0.35 28.8 3.5 <65
D 22-24 25-28 0.40 28.8 3.5 <65

30. 30
The class notation NAUT-
OSV(A) covers the following
main areas:
— mandatory and additional
workstations
— field of vision from
workstations
— location of instruments
and equipment
— ergonomics and human
machine interface
— range of instrumentation
— alarm management,
including watch
monitoring and alarm
transfer system.
— instrument and system
tests.
Navigation /
Navigation support
consoles
Aft Support / Ship
Handling consoles
225o FIELD OF
VISION
Lower level open-
office type layout to
ensure clear view
from fwd to aft work
stations.
180o FIELD OF
VISION
‘NAUT-OSV(A) ’ NOTATION COMPLIANCE

31. PICTURES OF SHIP MODEL
31
PHOTO COURTESY: EZRA HOLDINGS

32. LAUNCHING PHOTOGRAPHS (LAUNCHED ON 16 NOV 2012)
32

33. REACH US AT:
navnautik@singnet.com.sg
ntskolkata@navnautik.org
+65-98390308
+91-9831045428
www.navnautik.com
THANK YOU VERY MUCH
FOR YOUR TIME!
33
INFORMATION COURTESY:
•EMAS-AMC
•EZRA HOLDINGS
•SOFEL TRIYARDS
•DNV
•HUISMAN EQUIPMENT B.V.
•RAPP HYDEMA
•HOPPE Bordmesstechnik GmbH
•CYBERMARINE
Disclaimer: This presentation contains information which are subject to data obtained from various vendors and hence may be updated in
due course of time. Navnautik does not assure the credibility of vendor’s data. No part of this presentation can be reproduced without prior
consent of Navnautik.