[Dsg-hallbgas] LTCC sectors 3 and 5

[Marc McMullen]

Hi Morgan,

I went over to the hall but you were not there. It looks like sector 5 
has the input connected to the exhaust, so let me know when you want to 
start flowing gas. I'll wait to hear from you guys, as you should know 
the current configuration of S3 and 5.

George will address the pressure in the line and the 3 way valves.


Marc


On 8/30/2017 1:19 PM, Morgan Cook wrote:
> 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
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>>>
>>>
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>> <Screen Shot 2017-08-29 at 10.16.23 AM.png>
>
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-- 
Marc McMullen
Detector Support Group
757-269-7738