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

[Marco Mirazita]

Dear Tyler,
I also totally agree with your suggestion.
Marco


Il 2019-06-20 20:03 Patrizia Rossi ha scritto:
> 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> 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> 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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