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Proof Test Strategy
Optimising Off-line Testing
Where a safety function cannot be proof tested under true operating
conditions, consideration should be given to how testing can be optimised,
ideally during the design phase.
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Some techniques used to optimise testing are:
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Corroborative measurement of sensing element.
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Valve closure detected by downstream instrumentation.
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A series of partial testing at different intervals.
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Inclusion of diagnostic mechanisms.