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Weep Holes on PSV Discharge

thread1203-145981

Weep Holes on PSV Discharge

Weep Holes on PSV Discharge

(OP)
What situations is a weep hole needed on the discharge of PSV's?  I could not find it it APT 520 Part 2.  

Thanks

RE: Weep Holes on PSV Discharge

Condensation (dew), rain, sleet, snow, cleaning activities by contractors that don't know better, etc.  Especially if the discharge has a vertical run where accumulated liquid can appreciably affect the opening pressure due to backpressure.

Good luck,
Latexman

RE: Weep Holes on PSV Discharge

RJB32482,

In addition to Latexman's comments and for a reference in API RP-520 Part II, look at Figure 1, Typical Pressure Relief Valve Installation: Atmospheric (Open) Discharge.  Note 2 references a weep hole.

RE: Weep Holes on PSV Discharge

(OP)
Ok just looked in text and not in the figures.  Thank you both for the excellent learning infrmation.

RE: Weep Holes on PSV Discharge

You are most welcome!  Since you are new, you can thank folks for a valuable post by giving them a star.  Click the left link under each post you are thankful for.

Please don't give me a start now.  I don't want folks to think I'm begging.  Thanks!

Good luck,
Latexman

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