Patent ID: 11906061
Assignee: IDEATION AS
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 8:
9. The method according to claim 8, including the steps of first opening the second isolation valve before opening the first isolation valve of the second PSV,
the first and second SCs sending signals concerning the position of all isolation and bleed valves to a central safety system which via a valve safety matrix program decide whether it is safe to proceed, wherein a continue signal from the central safety system is needed in order to proceed,
if a field operator tries to proceed without the continue signal a local alarm as well as an alarm from the central safety system is activated,
if a continue signal is received, the first isolation valve of the first PSV is closed and its tightness tested,
if the integrity of the first isolation valve is verified, the second isolation valve of the first PSV is closed and its tightness tested,
if the integrity of the second isolation valve is verified, the first PSV is tested for correct opening pressure, if it is stuck or clogged, and/or is tight enough to remain in service, once the testing has been completed, first opening the second isolation valve, then the first isolation valve in order to activate the first PSV, or hold the isolation valves closed in order to replace or repair the first PSV.