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Strainer PSV

Strainer PSV

Strainer PSV

(OP)
We are installing a 16" pipeline strainer ahead of a pressure control valve to keep out the bits that may plug the control valve or valve port.  Do I need to install a PSV on the strainer?  Are pipeline strainers considered pressure vessels?

RE: Strainer PSV

Doen't matter, you'll have a PSV on the piping that will cover it.

RE: Strainer PSV

(OP)
hmm.....but the strainer will be equipped with block valves and bypass valve so the operators can take it out of service and clean the basket....

RE: Strainer PSV

I'd still go with administrative controls that require an open vent valve when both the block valves are closed.

RE: Strainer PSV

(OP)
hey, that's a good idea....  I can probably handle it with operating procedures in the manual.... and appropriate signage.

RE: Strainer PSV

I've seen chains and locks used or simple plastic tie wraps.  In  a similar thing, our pipelines has ASME pig traps.  we removed the psv (mainly because the psv must be tested 2 times per year by law and the pig trap was in town). I had a sign made up that read something like this.  "This piece of equipment requires a thermal relief path and the valves that must remain open are identified with a red color code.  To close this valve a permit must be obtained and an alternate path for thermal rlief must be provided."

The state inspectors we just fine.

RE: Strainer PSV

maddocks, I recently had the same problem, and it took me a while to convince the regulators that a PSV is not required.

Seem to recall the key points are:
- Design strainer for pump shut off.
- Only relief case must be fire case.
- Use ASME 8 App M to justify a PSV is not required.

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