[Dsg-rtpc] BONuS RTPC gas supply

[Brian Eng]

DSG did order the gas while the detector was still being constructed, but once it went to the Hall it went under the purview of Hall B.

Just to be a little more complete, here's what George has previously ordered for RTPC.

PR      Qty     Submitted       Ordered Arrived
383258  4       2/28/19 3/6/19  3/22/19
386752  4       7/23/19 7/24/19 9/16/19
389483  6       10/24/19        11/5/19 12/6/19
392248  4       2/10/20 2/19/20 3/25/20

While the vendor estimates 4-6 weeks, it's more like 3-8. That last shipment was delivered to 96B.

As for what the quantity remaining of those ordered Jiwan or the RTPC guys that were on site should have a better record of that.
________________________________________
From: Dsg-rtpc <dsg-rtpc-bounces at jlab.org> on behalf of Carlos Ayerbe Gayoso <gayoso at jlab.org>
Sent: Monday, April 6, 2020 3:57 PM
To: Sebastian Kuhn; Jiwan Poudel
Cc: Jack Segal; Jessie Butler; dsg-rtpc at jlab.org; Bob Miller; Denny Insley; Walt Akers
Subject: Re: [Dsg-rtpc] BONuS RTPC gas supply

Hi Sebastian,

I remember there was an email indicating where are the bottles (or somebody mention it), but I was unable to find such email (maybe I imagine that). However, I don't remember seeing any extra pre-mix bottles, besides the two we were using during the last beam days.

I'm CC to the DSG guys, since IF I AM NOT WRONG they were on charge of the acquisition of them (please George ignore this email if my assumption is incorrect).

Sorry for not being more useful.

Cheers

-Carlos
________________________________
From: Sebastian Kuhn <kuhn at jlab.org>
Sent: Monday, April 6, 2020 3:30 PM
To: Carlos Ayerbe Gayoso <gayoso at jlab.org>; Jiwan Poudel <jpoudel at jlab.org>
Subject: Fwd: BONuS RTPC gas supply

Hi Jiwan and Carlos,

can you check your recollection (emails) to let Walt, Jack and Jessie know which bottles you found, and which ones we are still looking for?

Thanks - Sebastian

Begin forwarded message:

From: Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>
Subject: Re: BONuS RTPC gas supply
Date: April 6, 2020 at 2:49:52 PM EDT
To: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>
Cc: Sebastian Kuhn <kuhn at jlab.org<mailto:kuhn at jlab.org>>, Walt Akers <akers at jlab.org<mailto:akers at jlab.org>>, Jack Segal <segal at jlab.org<mailto:segal at jlab.org>>, Jessie Butler <jbutler at jlab.org<mailto:jbutler at jlab.org>>

Hi guys,

    Of course you know that the current gas panel on the flammable pad does equalize across the two bottles in the system if both supply valves are open. We could move a rack to the pad with the remaining K bottles and plumb them together through a manifold, if we have one, we can plumb them with tubing if we don't.  We moved all of the gas on site to the gas pad outside the gas shed before the shut down.  If there was more on order I was unaware of it.  If it has been delivered to Hall B it will be on that same gas pad, this depends on who ordered the gas.

    I will Cc: Walt, Jessie and Jack on this email if you wish to ask them to check for new bottles. Other than the Hall B gas pad the cage outside of the EEL building, outside of the target group roll up door,  is the only other place we have seen it delivered to up til now.


Regards,
Denny


________________________________
From: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>
Sent: Monday, April 6, 2020 2:23 PM
To: Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>
Cc: Sebastian Kuhn <kuhn at jlab.org<mailto:kuhn at jlab.org>>
Subject: Re: BONuS RTPC gas supply

Hi Denny,

Please send Sebastian an update of how many full HeCO2 bottles we have
at JLab and where they are located.

Also, see if we have a manifold to connect the bottles together like the
N2 supply rack for RICH or the Hall D gas system, as Sebastian requests
below.

Thanks

Bob



On 4/6/2020 2:18 PM, Sebastian Kuhn wrote:
> Dear Bob,
>
> seeing your task list this morning reminded me that I wanted to ask you 2 things:
>
> 1) Do we know where the 4 bottles of HeCO2 are that got ordered this February? I THINK we should have a total of 6 bottles left, not counting the 2 on the gas pad right now that we use to maintain a minimal flow through the RTPC. IF that is not the case, we need to scramble to order more bottles, as the lead times were already rather large in the past and may be even worse now.
>
> 2) Would it be possible to design a simple “equalizer” rig that would allow us to hook up all remaining He/CO2 bottles together and open them all up so that the exact ratio CO2/He can equalize across all bottles? We found a significant variation of the RTPC performance from one bottle to the next, consistent with the fact that some bottles were quoted as 19.8% CO2 and others as 21%. The exact number is not as important as keeping it a constant throughout the rest of the run (whenever that might occur).
> Obviously, this would have to be made out of high-pressure tubing that can be connected directly to the bottles (without pressure reducers in between) - perhaps rigid steel tubing?
>
> Thanks, and wishing you continued good health - Sebastian

--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_rtpc/attachments/20200406/9cf86abb/attachment-0002.html>