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© 2017 American Bureau of Shipping. All rights reserved
From Concept to Practice The First Compressed Natural Gas Carrier
Sean Bond| 5 AprilGastech, Tokyo
• The Move to CNG
• Addressing New Technology
• The Project
• Risk
• Realisation
• Lifecycle Maintenance
2 | CNG From Concept to Practice
Contents
• 50+ years of LNG Shipping
• Market developments- Energy demand
- New niche markets
• Technology Developments- New concepts
- Marinization of existing compression technologies
3 | CNG From Concept to Practice
The Move to CNG
4 | CNG From Concept to Practice
PT-PLN Project
© Pavalena / Shutterstock
• Designer – CIMC ORIC
• Yard – Jiangsu Hantong
• Indonesian Owner – PT PLN
• Cargo containment system- 832 cylinders 12,040 x 615 x 19mm (250 Bar)
- design and fabrication by CIMC ENRIC
• Principal Particulars- 110.92(Loa)/104.12(Lpp) x 17.60 x 9.00 x 5.20m(dd) –
- Speed 13.90kN / Complement 18P / Endurance 8 Days
- Engine: Wartsila - 9L34DF – MCR 4,050kW x 750rpm
Compressed Natural Gas (CNG) Carrier
Source: CIMC ORIC
5 | CNG From Concept to Practice
• Trade: Gresik to Lombok Power Plant
• Displacement ~7,000t
• Lightweight ~6,000t
• Deadweight ~1,000t
• Cargo volume ~2,200m3
Loading & Offloading
Source: CIMC ORIC/ENRIC, ETI
6 | CNG From Concept to Practice
• ABS Guide for CNG Carriers
• Principles of IGC Code considered
• Additions and modifications include:
- Use of risk assessment
- CNG containment system
• Material requirements in fatigue and fracture
• In-service inspection
• Specific safeguards
• Pressure protection in cargo holds
• Probabilistic limit state design
- Active and passive fire safety
The Approach to Approval
Updated Feb 2014
7 | CNG From Concept to Practice
• While designing a CNG carrier the same hazards contemplated by the IGC Code for LNG carrier’s should be considered
- Collision
- Grounding
- Damage stability
- Gas release from cargo containment and/or cargo handling system
- Cargo hold protection
- Thermal effects on hull structure
- Gas cloud ignition
- Emergency shutdown
Technical Considerations
8 | CNG From Concept to Practice
• Safety Studies such as Gap Analysis & Risk Analysis to identify CNG hazards & requirements such as
- Over pressure of cargo hold from accidental gas release
- JT effect and impingement of cooled gas
- Dispersion of released high pressure gas
- Jet fire
- Radiant heat from fire
- Asphyxiation due to dispersed CNG & N2
Risks / Hazards Associated with CNG
9 | CNG From Concept to Practice
10 | CNG From Concept to Practice
• Specific consideration to- Containment system
- Piping systems
• Risk based approach is an option
• Inspection methods and requirements are project dependent
Lifecycle Maintenance
• Industry has its first active CNG project
• Exemplifies how to take a new technology for the carriage of gas from the drawing board to the shipyard and into service
• Goal of maintaining the Gas Transportation excellent safety record
• Specific details of individual CNG vessel concepts will drive many elements of the design and approval process
Conclusions
11 | CNG From Concept to Practice
12 | Title of Presentation Goes Here
The Launch
© 2017 American Bureau of Shipping. All rights reserved
www.eagle.org
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