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    RE: Proof Test Coverage of Final Elements

    By: Sriram Ramalingam , 2 days ago

    @Manas Das , ISA TR96.05.01 as mentioned below is a good reference for this. I would like to add a thought on your points 1,2 & 3. In the context of optimizing testing frequency, unless a full functional test is performed, and the valve is functionally restored fully, any number ...

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    RE: Proof Test Coverage of Final Elements

    By: Dharmasankara Chandrasekaran , 2 days ago

    Manas, Diagnostic Frequency and extent of latent faults detection (along with associated alarm) is a good basis to justify PST coverage factor. PST reliability (CF) is determined by weight factors associated with each contributory elements. see a few e.g. below Is the ...

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    RE: Proof Test Coverage of Final Elements

    By: Michael Scott , 2 days ago

    You are 100% correct. ISA-TR96.05.01 address partial stroke testing of automated valves. It includes a very detailed list of valve failures. The purpose is to see which of the various types of partial stroke testing methods can detect what type of failures. If you're looking ...

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    RE: Proof Test Coverage of Final Elements

    By: Manas Das , 3 days ago

    Thank you so much for taking time to reply to my question. I was looking for On-Off valve diagnostics, do you have any information on this. ------------------------------ Manas Das I&C Engineer ExxonMobil Services and Technology Private Limited Bengaluru KA ------- ...

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    RE: Proof Test Coverage of Final Elements

    By: Manas Das , 3 days ago

    Thank you so much for taking time to reply to my question. This is my understanding from your response: 1. We need to identify the different failure modes of the valve. 2. Identify what % of of these failure modes can be detected by the Proof Test. 3. This % is the proof ...

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