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Question 393 November 2005

Open Ends – Best practice for control of valves

We operate a chemical plant handling hazardous substances and have a significant number of vents and drain valves on the various process equipment, pipelines and instrumentation around the plant. Our policy is that all valves to atmosphere will be blanked or plugged to ensure containment if the valve were to be opened accidentally or fail open (rare, but it does happen). Our policy is also to always replace vents and blanks on these valves after maintenance however we do not have a good system for checking and auditing such a large number of valves. Does anybody have any examples of best practice for systems for controlling open ends, including identifying which ones are more safety critical than others?


The following 3 companies answered this question and 2 documents were supplied:

  • BP Chemicals Ltd
  • Canal & River Trust
  • Novartis Grimsby Ltd
  • "Acid Vaporiser Valve and Blank Integrity Checklist"
  • "Open Pipe Control"

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