Safety Critical Element Management ManualEP 2009-9009
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SCE group listing (continued)SCE goalTypical equipment typesDescriptionMinimum levelSCE group SD002
SCE group title Depressurisation System
Depressurisation System includes all valves for emergency depressurisation of flammable or harmful inventories.
To prevent major escalation
during afire incident by • preventing the rupture of process equipment or pipework which may suffer a decrease in mechanical strength due to the exposure or impact from an external source of heat or fire ensuring a rapid reduction in the size of any hydrocarbon inventor Blowdown valves Pneumatic/hydraulic actuators and local control circuits Any rate-determining elements (e.g. orifice plates) that are essential for the system to achieve its performance requirements
At system level
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