Safety Critical Element Management Manual

SCE group IC004SCE group title

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Shell EP 2009.9009 SCE Management Manual
POSITION PAPER 130[shell verification]

SCE group IC004
SCE group title Cargo Tank Inert gas System
Inert gas blanket systems provided for crude oil storage to prevent the gas cap being in the flammable range.
To ensure that Cargo and Slop
Tanks atmosphere are maintained below the Lower
Explosive Limit (LEL).
Typical earthing system comprises of earth rods,
earth bar, earth cables and connectors
At system level
SCE group IC005
SCE group title Earth Bonding
Earth bonding on equipment to dissipate the buildup of static electricity.
To minimise the likelihood of ignition from static in hazardous areas during the release of a
Major Hazard.
At area level
SCE group IC006
SCE group title Fuel Gas Purge System
Fuel Gas Purge System to prevent the presence of a flammable atmosphere in the system.
To provide sufficient purging of the flare or vent systems to prevent oxygen ingress and the possibility of detonation within the flare and vent system.
At system level
SCE group IC007
SCE group title Inert Gas Blanket System
Inert Gas Blanket System to prevent the presence of a flammable atmosphere in tanks.
To provide an inert atmosphere within enclosed process systems in order to prevent the ignition of flammable inventory.
At system level

Safety Critical Element Management Manual
EP 2009-9009
Restricted
42
SCE group listing (continued)
SCE goal
Typical equipment types
Description
Minimum level
SCE group IC008
SCE group title Miscellaneous Ignition Control Components
Component installed to minimise the risk of a source ignition from mechanical equipment that can generate sparks or hot surfaces above ignition temperature in a fault or operational condition and in a hazardous area.
Component installed to minimise the risk of a source ignition in a hazardous area.
At system level Vent/exhaust flame traps Anti-static devices, e.g. fan belts Diesel/turbine exhaust temperature control

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