[Dsg-rich] Discussion from DSG meeting on RICH N2 backup

[Patrizia Rossi]

I too think that this is a wise suggestion. We have to know from B. Miller how much work/cost this will require
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On 20 Jun 2019, at 14:02, Amrit Yegneswaran <yeg at jlab.org<mailto:yeg at jlab.org>> wrote:

dear tyler,
excellent synopsis.
i strongly endorse your suggestion of putting the back-up gas banks outside, so that we can can access them even when the power is out; would be detector-saving during the hurricane season, if we were to lose power.
amrit
________________________________
From: Dsg-rich <dsg-rich-bounces at jlab.org<mailto:dsg-rich-bounces at jlab.org>> on behalf of Tyler Lemon
Sent: Thursday, June 20, 2019 1:52 PM
To: dsg-rich
Subject: [Dsg-rich] Discussion from DSG meeting on RICH N2 backup

Hello,

When N2 supply was shut off to RICH, the backup bank set (two 12-cylinder N2 banks) lasted ~ 77 hours. The first bank in the set lasted ~36 hours. The second lasted ~41 hours. A plot of the pressures at the RICH N2 panel showing this time period is attached.

Since the backup bank set is now empty, DSG has procured a new set and also an additional set since the lead time on the banks' delivery is about three weeks.

In yesterday's DSG meeting, we discussed the potential for loss of N2 to RICH during a situation preventing access to Hall B (power outage).

In this situation, the backup banks will not be able to be replaced if they run out. To remedy this, DSG strongly suggests relocating the backup banks outside Hall B at the gas shed. George has noted that there is already available piping from the gas shed to the forward carriage. Gas lines will only have to be run from the banks to the input at the gas shed and from the output on the forward carriage to the RICH N2 panel.

Best regards,
Tyler
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