Isle of Grain LNG Overfill Protection

case study
about the project
Grain Liquefied Natural Gas (GLNG) is a top tier COMAH site which has been re-purposed from an LNG peak shaving plant into a LNG importation terminal in 2005 which was then expanded with extra storage capacity, berthing slots and export capacity in 2008 and again in 2010. The Phase 1 storage tanks have been modified since their inception by increasing the number of pipes that can flow LNG into each tank. It is possible for more than one pipe to be filling a tank at the same time. As a result, it has been identified that LNG storage facilities are prone to overfilling hazards which could lead to loss of containment that, if ignited, could result in fatalities.
Lagoni was contracted to perform a Function Safety Assessment to enable GLNG to demonstrate compliance or to provide the basis for devising the roadmap toward full compliance in achieving the required Target Mitigated Event Likelihood (TMEL) and adequate risk reduction.
The assessment included:
• HAZOP Review
• Task Analysis
• Fault Tree Analysis
• Event Tree Analysis
• SIL Determination
• SIL Verification
• ALARP Demonstration / Cost Benefit Analysis
• Sensitivity Analysis
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