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Pressure/ Vacuum Vent Valve Needs Discharge Line?


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#1 PSU

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Posted 17 December 2019 - 09:40 PM

Dear Sir

 

When I have reviewed PSV shown on P&ID, discharge line of PSV has been specified with note that it shall be 10 feet far away from equipment in case of releasing to ATM.

 

On the other hand, Pressure/ Vacuum Vent Valve at atmospheric tank is always specified to release to ATM, also. I was wondering why 10 feet far away from equipment will not be applied for.

 

Could you please give me the advice or more explanations or reference?



#2 breizh

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Posted 18 December 2019 - 12:40 AM

Hi ,

I believe this has to do with the safety , to ensure no obstacle to affect the release ( read the PP about the distances , vertical and horizontal) .

note : make sure the release is not on a walk way which could affect human .

 

My view

Breizh

 

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#3 PSU

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Posted 18 December 2019 - 08:50 PM

Dear breizh

 

That's very kind of you for giving me the advice and reference. I used to join the inspection team to check tank farm.

I have not found Pressure/ Vacuum Vent discharge at least 10 feet above the platform before. However, I have observed that orientation of out breathing is not on the walk way. It should be safe enough.






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