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Posts Tagged ‘full stroke test’

Safety Valve and Actuator Proof Test Coverage

Posted in Final Control Element, Safety on Wednesday, November 9th, 2011. 10 comments so far
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I saw an email string with a question asking if it’s possible to detect all possible failure modes in a safety valve if very intensive and intrusive tests, such as full-stroke testing, leak testing, etc. are performed. Would it be conceivable to use 100% proof test coverage when performing full repair upon detection of a […]

Hydraulic Partial Stroke and Diagnostics on Emergency Shutdown Valves

Posted in Final Control Element, Oil & Gas, Subsea on Friday, January 21st, 2011. No comments yet
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I’ve discussed partial stroke testing (PST) as a diagnostic for the health of a valve in many posts over the years. These posts describe flow applications found in most process manufacturing facilities. But what about high-pressure and hydraulic applications including subsea wells and natural gas pipelines? I came across an internal article written by Emerson’s […]

Credit for Partial Stroke Tests in Verification Process

Posted in Final Control Element, Safety on Friday, January 14th, 2011. No comments yet
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A question was posed this week to Emerson’s Mike Boudreaux about how to take credit for partial stoke tests in a performance verification process. Mike leads the process safety systems efforts and was presenting on this topic this week. He wrote up this post to recap the question and highlights from the seminar: I had […]