Engineering services for shipping and offshore actors

1. EMMO Safety Engineering AS
services for
offshore and shipping actors
19. Januar 2010
Contact info:
emmosafety@emmo.no
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2. EMMO Safety Engineering AS capabilities: Offshore and shipping actors engagements:
1: Definitions of design and fabrication Construction
premises based on government and/or class development premises
regulations and project specific needs
2: Structural design/verification for misc. Global and detail design
vessel structures, offshore structures (jacket,
rig, semisubmersible, FPSO, windmills etc.)
and modules
3: Fabrication follow-on; services for Construction fabrication
evaluations for ”fit-for-purpose” or
modification/strengthening
4: Operation optimalisation; services for
evaluations for minimum in-service cost wrt Construction in-service
inspections and failure risk (RBI/RCM), ”fit-for- operation optimalisation
purpose” due to deviations or modification and
strengthening for upgrade of structure capacity
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3. EMMO Safety Engineering AS engineering support capabilities :
Examples of areas covered by EMMO Safety Engineering:
1: Definitions of design and fabrication premises based on regulations and project experiences
a) Design Class and material selection
b) Welding selection
c) Tolerences for fabrication; general specification
d) Tolerences for fabrication; module connections towards vessel based on design for maximum mismatch allowances
e) Alternative tasks
2: Structural design/verification for vessel structure, topside modules and topside supports onto vessel
a) Global structural design for vessel based on DnV Ship Rule Design principles
b) Local structural FE/handcalc. design of topside module, crane structure, flare structure, etc
c) Local structural FE/handcalc. design of vessel structure at e.g. supports of modules, risers, crane, flare or mooring structure
d) Local structural FE/handcalc. design of support stools for topside modules
e) Interface and detail engineering of structures between vessel conversion and topsides, risers, mooring, flare etc.
f) Alternative tasks
3: Fabrication follow-on; services for evaluations for ”fit-for-purpose” or modification/strengthening
a) Mismatches in fabrication
b) Weld defect evaluations
c) Evaluations due to increased/changed load levels
d) Evaluations due to deviations in material quality
e) Alternative tasks
4: Operation optimalisation; services for evaluation of minimum in-service cost wrt inspections and failure risk
a) Cost-optimal solutions for modifications
b) Cost-optimal solutions for in-service inspection findings
c) Risk / Reliability (RCM / RBI) methods for cost-optimal inspection for structural / fatigue damages
d) Risk / Reliability (RCM / RBI) methods for cost-optimal inspection for corrosion damages
e) Alternative tasks
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4. 1: Definitions of design and fabrication premises based on regulations and project experiences
ULCC ship Deck footing Vessel
modification mismatch equipment/
requirements requirement mooring/riser
wrt fatigue support
and material requirements
Vessel plate thicknesses and corrosion protection requirements
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5. 2: Structural design/verification for vessel structure, topside modules and topside supports onto vessel
Topside
module
support
design
Topside module design
Moonpool egde
Longitudinal
bulkhead Duct’s in vessel
12000 off CL
acting as Curved transverse bulkhead
Longitudinal bulkhead 5250 off CL acting as support
support Cut-out in vessel support-box
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6. 3: Fabrication follow-on; services for evaluations for ”fit-for-purpose” or modification/strengthening
Mismatches in fabrication
Weld defect evaluations
Evaluations due to increased/changed load levels
Evaluations due to deviations in material quality
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7. 4: Operation optimalisation; services for evaluations for minimum in-service cost wrt inspections and failure risk
Material composition evaluation CTOD testing for brittle material control
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8. 4: Operation optimalisation; services for evaluations for minimum in-service cost wrt inspections and failure risk
Standard NDT performance - Class rule approach
PROBABILITY OF FAILUR PF
7
RELIABILITY INDEX βr
6
Required
5 minimum
safety level
4 = Reliability
10-4
3
2
1
0 0.5
0 10 20 30 40
1.st inspection
1. inspection 2.nd inspection
2. inspection 3.rd inspection
3. inspection 4. 4.th inspection
inspection
after 57 years
after years after 10 years
after 14 years after 15 years
after 21 years after 20 years
after 28 years
E.g. case with E.g. case with E.g. case with E.g. case with
inspection inspection inspection inspection
extent 100%. extent 100%. extent 100%. extent 100%.
Page 8/10 In this case, the sum of inspection extent is 400%. EMMO Safety Engineering AS

9. 4: Operation optimalisation; services for evaluations for minimum in-service cost wrt inspections and failure risk
Risk based NDT performance – Detailed fatigue and risk calculation approach (RCM)
RCM = Risk Centred Maintenance
RBI = Reliability Based Inspection
Approach for optimalisation of inspection extent:
PROBABILITY OF FAILUR PF
7
RELIABILITY INDEX βr
6
Required
5 minimum
safety level
= Reliability
4 10-4
3
2
1
0 0.5
0 10 20 30 40
1.st inspection 2.nd inspection 3.rd inspection 4.th inspection
1. inspection
after 5 years 2. inspection
after 10 years 3. inspection
after 15 years 4. after 20 years
inspection
after 7 years after 14 years after 21 years after 28 years
E.g. case with E.g. case with E.g. case with E.g. case with
inspection inspection inspection inspection
extent 100%. extent 60%. extent 60%. extent 40%.
Page 9/10 In this case, the sum of inspection extent is 260%. EMMO Safety Engineering AS

10. 4: Operation optimalisation; services for evaluations for minimum in-service cost wrt inspections and failure risk
Reliability based NDT performance – Detailed fatigue and risk calculation approach (RBI)
RCM = Risk Centred Maintenance
NDT (1) performance and RBI (2) updating
RBI = Reliability Based Inspection
Approach for optimalisation of inspection intervals:
PROBABILITY OF FAILUR PF
RELIABILITY INDEX βr 7
6
5
Required
4 minimum
10-4 level
safety
= Reliability
3
2
1
0 0.5
0 10 20 30 40
25 year
1.st inspection 2.nd inspection
1.st inspection 2.nd inspection
after 7 years after 14 years
after 5 years after 14 years
E.g. case with E.g. case with
inspection inspection
extent 100%. extent 80%.
RBI approach
In this case, the sum of inspection extent is 180%.
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