Hydrotest (High point) Vents

From: <ravi>
Date: Tue Dec 18 2007 - 17:21:00 EST

Hi All,

   I am a Junior Piping Designer working in a EPC company.    One thing which i came across recently had two different opinions, both backed by senior checkers. I got confused with that and hence am seeking information from the elite group.

   Lets say a header running N-S in pipe rack is 3" at EL. 100. A tapping of 2" is taken from top. The branch line turns east at a EL. 110, making it a high point. Branch line runs 2m in east and drops to EL.90. Runs in East direction for 5 m and again goes up to reach to the top of reactor. At El. 130 it turns east again and drops to EL. 125 to have a quick release coupling at the end for flexible hose hook up.

   In the horizontal run of 5m at EL. 90. It has a branch of 1" from top which goes to EL 50. Also a low point drain is provided in this horizontal run.

   Now the question is where to provide high point vents. There are two local high points one in rack at EL. 110 and then at top of reactor structure EL. 130. One of the checker had a opinion that you provide 1 high point vent only and that would be at EL.130 ( i.e one high point for the whole system), whereas the other had the concern for air trapped at EL. 110, so he wanted to add a hp vent there too.

   What is followed as a practice?
   Your advice would be really appreciable.

   Thanks
   Ravi

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[Non-text portions of this message have been removed] Received on Tue Dec 18 17:21:00 2007