Report On The Effects Of Fire On LNG Carrier Containment Systems (eBook)

Published Date

August 2012

Report On The Effects Of Fire On LNG Carrier Containment Systems (eBook)

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This SIGTTO report investigates the response of LNGC cargo tanks exposed to a large enveloping pool fire that could possibly result from the spillage of LNG onto the sea and its subsequent ignition. This follows concern about the vulnerability of LNG carrier tanks insulated with non-fire-resistant materials such as polystyrenes or polyurethanes.

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Current practice provides for pressure relief systems, designed with credit for the tank’s insulation, to prevent LNG cargo pressurisation due to boil-off and fire (IMO IGC Code 8.5). There is concern that the insulation materials in the PRV system may not withstand fire temperatures, or the system itself may not be capable of relieving the vapour flows resulting from the increased boil-off due to partial or total insulation failure.

 

After consulting SIGTTO members, the LNGC containment system designers, the USCG and the major classification societies, a working group was formed to investigate the subject and report back on the possible effects and any mitigation measures required. They concluded that for the complex issue of how a large fire scenario may emit heat to a high-sided vessel and affect the internal materials and structure of an LNG carrier, there were many areas of uncertainty. The studies capture both steady state and time-based calculations, which rely on knowledge of, or assumptions for, fire scenario conditions.

 

Given the concerns within the industry over large pool fire surface emissive powers, and their impact on a carrier structure, unanimous agreement for the report was unachievable. However, the vast majority agreed with the conclusions and recommendations made in Chapters 10 and 11.

In steady state conditions, providing the relief valves comply with the sizing requirements of the IGC Code, the valves are capable of relieving the anticipated vapour from the loss of the entire insulation layer as well as the weather cover of a Moss-type LNG carrier.

 

For time-based calculations, following extensive tests and reviews of previous insulation studies, a range of times for complete degradation of insulations could not be achieved due to conflicting evidence. Therefore, Recommendation 2 is made.

 

This book covers ESD Arrangements and Linked Ship/Shore Systems for Liquefied Gas Carriers.

Title: Report On The Effects Of Fire On LNG Carrier Containment Systems (eBook)
Product Code: 4436F031
Published Date: August 2012

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