[Dsg-ltcc] Fwd: LTCC gas system

[Brian Eng]

Hi David,

All the flows were reduced to 0.5 LPM except for S2 & S6 (5 LPM & 3 LPM respectively). Those were set to ~1 LPM higher than when the flow as on 100% of the time, so figure the leak rate is somewhere between those numbers.

The leak on S1 is much improved if not completely fixed as I haven't seen the flow kick on recently.

S3 still has a leak as I see the flow (at 0.5 LPM) turn on periodically.

--
Brian Eng
Detector Support Group
757-269-6018

> On Dec 2, 2016, at 2:40 PM, Marc McMullen <mcmullen at jlab.org> wrote:
> 
> 
> 
> Marc McMullen
> Physics Division
> Detector Support Group
> 7738
> 
> From: "David Anderson" <dla at jlab.org>
> To: "Marc McMullen" <mcmullen at jlab.org>
> Cc: "George Jacobs" <jacobsg at jlab.org>, "Douglas Tilles" <tilles at jlab.org>, "Bob Miller" <rmiller at jlab.org>
> Sent: Friday, December 2, 2016 1:08:31 PM
> Subject: Re: LTCC gas system
> 
> Marc,
>  Please reduce the flow to .5Lpm, I found a lot of leaks due to loose connections and one stainless to stainless connection with no ferrule at all.
> I see no leak issues with 1, 3, 4 or 5. However 2 and 6 are still leaking, I have more connections to check for 2 and 6 and will when manlift time is available.
> In the meantime we should be able to use .5Lpm without causing any issues.
> 
> It seems we have another issue as well with a solenoid for sector 2. Flow to the chamber had ceased and yet the flow rate was still at 10Lpm.
> After unplugging and reconnecting that solenoid the chamber began to refill. 
> 
> Thanks,
> David
> 
> ----- Original Message -----
> From: "David Anderson" <dla at jlab.org>
> To: "Marc McMullen" <mcmullen at jlab.org>
> Cc: "George Jacobs" <jacobsg at jlab.org>, "Douglas Tilles" <tilles at jlab.org>, "Bob Miller" <rmiller at jlab.org>
> Sent: Friday, December 2, 2016 11:54:19 AM
> Subject: Re: LTCC gas system
> 
> Ok thanks.. David ----- Original Message ----- From: Marc McMullen To: David Anderson Cc: George Jacobs , Douglas Tilles , Bob Miller Sent: Fri, 02 Dec 2016 10:19:21 -0500 (EST) Subject: Re: LTCC gas system 
> 
> Hi Dave, 
> 
> It appears that 0.5Lpm was not enough flow to maintain pressure. We have increased the flow and will monitor it, and dial it back when necessary. 
> 
> 
> Sectors 2 and 6 look to be significant leaks 
> 
> Sector 1 flow is almost always on, but will maintain pressure. So definitely a leak there but smaller. 
> 
> Sector 3 appears to leak a little. 
> 
> Sectors 4 and 5 looks insignificant. 
> 
> 
> 
> 
> Marc 
> 
> On 12/2/2016 7:48 AM, David Anderson wrote: 
> 
> 
> George, When you or Marc get time I need some assistance with this gas panel. We have lost almost all pressure on 6 and 2. Thanks! ----- Original Message ----- From: David Anderson To: George Jacobs , Marc Mcmullen Cc: Douglas Tilles , Bob Miller Sent: Thu, 01 Dec 2016 08:58:43 -0500 (EST) Subject: LTCC gas system George and Marc, I have been asked to begin leak checking the entire LTCC gas circuit. The chambers had a thorough leak check and min 24 hour pressure drop test before they were hoisted and installed. Another complete leak check of the chambers is not going to be possible due to very limited access to the bottom windows. However we can pressurize the system and perform pressure drop tests to begin with. I have no knowledge of the gas panel progress or operation so I am requested your assistance with this. Has any leak checking of the gas circuit itself been performed? Thanks, David 
> 
> 
> -- 
> Marc McMullen
> Detector Support Group
> 757-269-7738
> _______________________________________________
> Dsg-ltcc mailing list
> Dsg-ltcc at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-ltcc