© 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

Thank You