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[Sphenix-magnet-l] leak in the He pipeline of Valve Box

From: Kin Yip <kinyip AT bnl.gov>
To: "sphenix-magnet-l AT lists.bnl.gov" <sphenix-magnet-l AT lists.bnl.gov>
Subject: [Sphenix-magnet-l] leak in the He pipeline of Valve Box
Date: Thu, 03 Sep 2015 10:35:36 -0400

Hi,

After gathering M. Gaffney and the safety people, Ray Ceruti and his team pumped in He (to the max. of 6.6 bar) to do the pressure test.
Before the pressure test, the vacuum pressure was at the level of something like 7*10-9 mbar or so. But after pumping in He, the pressure
reached 10-3 mbar in about 10 minutes. So, there is a leak (though may not be huge). [ In the process, they found a O-ring outside that
was burst but that's not the reason as it's between the outside atmosphere and the valvebox (not between the He pipeline and inside valvebox. ]

Ray et. al. now need to find it (by breaking up the system piece by piece) ... I have the impression that it's not easy ......

Kin

[Sphenix-magnet-l] leak in the He pipeline of Valve Box, Kin Yip, 09/03/2015
- [Sphenix-magnet-l] leak in the He pipeline of Valve Box (2nd trial), Kin Yip, 09/03/2015
  - Re: [Sphenix-magnet-l] leak in the He pipeline of Valve Box (2nd trial), Ceruti, Raymond B, 09/03/2015
    - Re: [Sphenix-magnet-l] leak in the He pipeline of Valve Box (2nd trial), Than, Yatming (Roberto), 09/03/2015