[Dsg-hallbgas] LTCC sectors 3 and 5

[Morgan Cook]

Marc,

Please take a look at the LTCC gas system.  David disconnected sector 5 and capped both ends after you changed the setpoint and he closed the 3-way valve on Tuesday. Just now he went to tie the supply and return together and the supply side was under a lot of pressure.  As I mentioned earlier, the same thing happened with sector 4.

Thanks,
Morgan 

----- Original Message -----
From: "Maurizio Ungaro" <ungaro at jlab.org>
To: "Brian Eng" <beng at jlab.org>
Cc: dsg-hallbgas at jlab.org, "David Anderson" <dla at jlab.org>
Sent: Tuesday, August 29, 2017 10:31:13 AM
Subject: Re: [Dsg-hallbgas] LTCC sectors 3 and 5

Hi Brian,

Ah that help. It looks to me that there is still drop in pressure, uncorrelated with weather.
Looking forward to your new extrapolation of leak rates. 

Thanks,
Mauri


> On Aug 29, 2017, at 10:24 AM, Brian Eng <beng at jlab.org> wrote:
> 
> Mauri,
> 
> That "significant drop" you were referring to yesterday is just due to the deadband of the archiver (0.1 slm) so all of the spots where it doesn't have a spike should be considered equivalent to zero.
> 
> If you zoom out a bit further and add the sector pressure as well you can see there is a significant difference from when the detector was attached versus when it was removed.
> 
> Namely the amount of time the flow is on (~30 min vs ~3 sec) and how high the pressure gets when the flow is applied.
> 
> George has mentioned that the 3-way valves used to turn off the gas are quite old and difficult to put in the completely closed position.
> 
> ----- Original Message -----
>> From: "Maurizio Ungaro" <ungaro at jlab.org>
>> To: dsg-hallbgas at jlab.org, "David Anderson" <dla at jlab.org>, "Stepan Stepanyan" <stepanya at jlab.org>
>> Sent: Tuesday, August 29, 2017 9:28:26 AM
>> Subject: Re: [Dsg-hallbgas] LTCC sectors 3 and 5
> 
>> Hi Brian, Marc, David,
>> 
>> If I understood correctly (please correct me if I'm wrong) Dave bypassed S4 box
>> (i.e. jumped the 2 ends together) on Friday the 25.
>> 
>> On the flow chart for S4 I see a signigicant drop yesterday right after 8am, but
>> not much on Friday, see attached plot, not sure how to interpret it.
>> 
>> Could you update on the leaks calculations for S4, and give updates in general,
>> both on leak checks and leaks measured, when available?
>> 
>> Thanks so much for this important work,
>> 
>> Mauri
>> 
>> 
>> 
>> 
>> 
>> 
>> On Aug 29, 2017, at 8:51 AM, Marc McMullen < mcmullen at jlab.org > wrote:
>> 
>> 
>> 
>> 
>> 
>> 
>> -------- Forwarded Message --------
>> Subject: 	Re: LTCC sectors 3 and 5
>> Date: 	Tue, 29 Aug 2017 08:43:32 -0400
>> From: 	Marc McMullen <mcmullen at jlab.org>
>> To: 	Morgan Cook <mcookiv at jlab.org>
>> CC: 	Dsg-hallbgas <dsg-hallbgas-bounces at jlab.org> , David Anderson
>> <dla at jlab.org>
>> 
>> Hi Morgan,
>> 
>> I have changed the setpoint on the MFCs to 0 for S3 and S5. Before David
>> starts his work, he should change the valve position on the 3 way valve
>> for those two sectors to the close position which is straight down
>> (90deg from current).
>> 
>> 
>> Thanks,
>> 
>> Marc
>> 
>> 
>> On 8/29/2017 7:14 AM, Morgan Cook wrote:
>>> Mark,
>>> 
>>> Please shut off the gas to LTCC sectors 3 and 5.  David is going to leak check
>>> them.  In addition, please let us know when the gas is off.
>>> 
>>> Thanks,
>>> Morgan
>> 
>> --
>> Marc McMullen
>> Detector Support Group
>> 757-269-7738
>> _______________________________________________
>> Dsg-hallbgas mailing list
>> Dsg-hallbgas at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/dsg-hallbgas
>> 
>> 
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> <Screen Shot 2017-08-29 at 10.16.23 AM.png>


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