Re: Query: installation sense of PSV''s

From: <C.Y>
Date: Fri Jan 14 2005 - 20:25:00 EST

I reminbered "PSV should be installed vertically" is one statement of API code (or maybe ASME BPC code), but there is not a solid reason why.

I do not see a problem to install a PSV in horizontal position, only "problem" is your piping installation does not agree with the code anymore. If you have no other way to install it, you may want to get approval from client to do it this way.

Thanks
Robert Liu

sandeep manoharan <sandeep.manoharan@eil.co.in> wrote:

thanks for your interest ....

The "generally not" portion is already clear to me but i want to know why ??
>>Generally it is NOT desirable to install PSV-s in horizontal plane.

refer my earlier mail : i have accounted for condensate draining for both the inlet as well outlet line.
>>In case of condensing vapour lines (e.g. steam), there are chances that
>>condensate may accumulate upstream of the valve during normal operation.
>>When the PSV pops-up, there are chances that there would be severe
>>hammering effect in the entire pipeline. This is typically the reason why
PSV-s >>are installed at the highest point of a pipeline, pipes gradually
>>sloping in either direction

that should not be a problem as my space constraint is mainly because of 

structure above hence supporting is not an issue ....... reactive forces in
horizontal plane ....... i do not see any problem ...provision of guides / cross
guides in the requisite directions should suffice ..........

>>One more problem would be proper supporting of the pipes. How would you
>>take care of the reaction force during PSV pop-up?

regards

sandeep

"sandeep manoharan"
01/14/05 09:44 AM
Please respond to PipingDesign

To:

cc:
Subject: Re: [PipingDesign] Query: installation sense of PSV's .

if you could englighten me & substantiate your reply...... because i believe PSV's being spring loaded should not be faced with that problem ........ ......

thanks in advance ....

sandeep

Check with the PSV vendor.

Typically you can't because the valve will not seat properly after relieving.

sandeep manoharan wrote:

gentle folks....

can PSV's be installed in the Horizontal plane i.e. both inlet & outlet are in the same horizontal plane. My situation arises because of height & space restriction.
thanks in advance..

sandeep

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[Non-text portions of this message have been removed] Received on Fri Jan 14 20:25:00 2005

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