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high point vents/low point drains-frequency

high point vents/low point drains-frequency

high point vents/low point drains-frequency

I am working on the piping design for a hot water heating system on a 7 story hospital. Coordination with other trades on this job has been a nightmare and has forced us to make some undesirable routing choices.
As the HWS/R loop makes its way around each floor to individual VAV's, there are a substantial amount of elevation changes. This naturally creates traps. ALL OVER THE PLACE. In some instances our piping comes over the top of the VAV's, in others, underneath the VAV's.

As I'm working to wrap up the design I'm going back to install high point vents and low point drains on each floor. My plan is to put a HPV at the highest point per floor and a LPD at the lowest point.

My question is how redundant should I be with placing vents and drains? Is it necessary to put a LPD everywhere there is a trap? Would I want to put a HPV at the highest point of every branch? Is it necessary to put them on both Supply and Return?

Any help would be greatly appreciated. I certainly do not pretend to be an expert in fluid dynamics.

Thanks in advance

RE: high point vents/low point drains-frequency


As I'm working to wrap up the design.....My plan is to put a HPV at the highest point per floor and a LPD at the lowest point.

IMO, this can be an issue later because "...the traps all over the place.." and no way to know where the HPV or LPD are needed as the inadequate flow problem happened or the piping shutdown required for maintenance or cleaning.

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