[Dsg-rtpc] RTPC gas system valve panel test setup diagrams for the EEL

Fri May 31 13:23:46 EDT 2019

Dear All,

Sebastian already answered all the questions. This is only to share the VERY initial manual of the gas system (with some emphasis in the panel, but try to cover the whole system). Nathan wrote a description of the DMS, which is incorporated in the note. I am pretty sure more details of the DMS will come soon.

Also, as Sebastian mentioned, the note/manual needs to be updated, specially now due to some small modifications advised by Bill, but I expect from the coming tests to incorporate more instructions.

I attached AN OLD VERSION of the system (with old I meant it was the work design until a month ago). The one shown by Bill was more to detail the gas panel and doesn't include the big picture or details about the piping.

If there are more questions I/we are happy to try to find an answer.

Cheers

-Carlos
________________________________
From: Sebastian Kuhn
Sent: Friday, May 31, 2019 12:12 PM
To: Bill Crahen
Cc: Bob Miller; Carlos Ayerbe Gayoso; George Jacobs; dsg-rtpc at jlab.org; Cyril Wiggins; JIWAN POUDEL; Stephen Bültmann; Ibrahim Hakki Albayrak; Eric Christy
Subject: Re: [Dsg-rtpc] RTPC gas system valve panel test setup diagrams for the EEL

Dear all,

please make sure that we have ONE CONSISTENT set of drawings and operating manuals for the whole RTPC / DMS gas system (the target gas system is entirely separate). Since Carlos is the keeper of the manual, please make sure that all questions and suggestions for improvements of that document be referred to him. He should then distribute information to all interested parties, so if you need an up-to-date drawing, he should have it.

To answer some of the questions that came up below:
1) The labeling on the top drawing (front face of the RTPC) in the document attached by Bob is somewhat confusing - even to me. Maybe Cyril/Ibrahim can clarify? In any case, the BONuS12 RTPC will have
    - 4 inlet ports for drift chamber gas, that will be fed (via a quadruple split) from a SINGLE line coming from the gas panel (“to RTPC”).
    - ONE outlet port for drift gas, connected to “From RTPC”
     - one port for measuring the pressure (“To PRTCP Press Port”)
     - one inlet port for the buffer (4He) volume (“To Buffer”)
and one outlet port for the buffer (“From Helium Buffer”)

2) The DMS is  still under development and will be in its own, separate circuit, located physically close to the gas panel (“To DMS” and “From DMS”). For now, we should have a simple tube connecting these 2 ports with each other, perhaps T’d off with a second line to the Pressure Transducer Pt2 (“To DMS Press Port”).

3) Once BONuS12 moves to the Hall, all bubbler exhausts will indeed be fed into the general Hall B chamber gas exhaust that goes to the outside of Hall B, to avoid poisoning the PMTs etc.

4) During operation in the Hall, the gas bottles will indeed be located in the relevant gas pads outside (George knows which ones). During our tests in the EEL, we will use a gas bottle already installed there. We will NOT use the Helium-4 buffer volume part of the gas panel in the EEL - if it is to be tested, it should be tested with simple closed tubing from output to return.

5) Initially, we will use the gas panel in the EEL to run the existing EG6 RTPC prototype, until the first BONuS12 RTPC becomes available (estimate: July). This EG6 prototype has NO pressure port, so we will not be able to test this until later. Instead, it has two gas inlet ports, which again have to be T’d from the single “To RTPC” outlet port on the gas panel.

6) In general, the EG6 RTPC is NOT meant to be used to test operation of the gas panel. It is just as fragile as the final RTPC (or more so), so it must not be overpressured, or otherwise operated outside of specs. All desired tests of the gas panel should be done by either connecting single tubing from output to return ports, or by inserting a “T” if, for instance, the pressure transducers are supposed to be tested. During EG6 RTPC operation, we literally will only be using the “To RTPC” and “From RTPC” ports on the gas panel.

7) Several BONuS collaborators will be taking a pressure vessel safety course next Wednesday, after which time they will be recorded as authorized in the COO and will be able to hook up and operate the EG6 RTPC. Before that, that RTPC should remain safely in its transport box and not be used at all.

Thanks, and have a nice weekend - Sebastian

On May 31, 2019, at 10:20 AM, Bill Crahen <wcrahen at jlab.org<mailto:wcrahen at jlab.org>> wrote:

I have been assuming the supply bottles are in or near the gas shed, although they could be in the hall. The lines running from the tanks can be tiny, the flow is next to nothing. I assumed 1/4" copper or stainless steel, but they could certainly be Nylotube if this makes your life easier. Count is a 20/80 mix line, and a helium line. You of course have the hydrogen/deuterium line, but that is a separate system.

The bubbler exhausts on the panel could vent into the hall from an ODH perspective, but you may wish to vent outside as helium and PMT's don't like each other.

As to lines to and from the detector, only two supply lines (He and 80/20) and two return lines are needed, they can split at the detector (see attached file).

There is a device called the DMS which is also shown on the schematic- I have no information on this system other than it will contain two radioactive sources.

I am sorry I can't tell you more, but this is all I know at this time.

One note- I am guessing as to which lines are the inlet and outlet- I may have them backwards.

On 5/31/2019 7:36 AM, Bob Miller wrote:

These drawings do not make any sense to me.

How many gas lines are there from the gas panel to outside of the Hall?

How many lines are there from the gas panel to and from the detector assembly?

Thanks,

Bob

On 5/30/2019 1:33 PM, Bill Crahen wrote:

We actually have two drawings that are the same thing- we should kill one (PD11). As to where the supply and panel are located, that is TBD (I assume bottles are outside, but that is your call). The drawing does not specify line size or material (it should), this should be cleaned up by Cyril.

On 5/30/2019 12:23 PM, Bob Miller wrote:

Hi Bill,

Is there an actual drawing for the Bonus detector gas system that shows all of the gas supplied and removed from the gas panel?  I am looking for a drawing that shows where the gas is stored, how it is transferred to the gas panel, and what lines go from the gas panel to the detector.

Thanks

Bob

On 5/9/2019 10:52 AM, Bill Crahen wrote:

Bob and Cyril- The P&ID and the assembly need to be assigned drawing numbers for the pressure system documentation.

-------- Forwarded Message --------
Subject:        Re: [Dsg-rtpc] RTPC gas system valve panel test setup diagrams for the EEL
Date:   Wed, 8 May 2019 15:46:17 -0400
From:   Sebastian Kuhn <kuhn at jlab.org><mailto:kuhn at jlab.org>
To:     dsg-rtpc at jlab.org<mailto:dsg-rtpc at jlab.org> <dsg-rtpc at jlab.org><mailto:dsg-rtpc at jlab.org>
CC:     Carlos Ayerbe Gayoso <gayoso at jlab.org><mailto:gayoso at jlab.org>, Bill Crahen <wcrahen at jlab.org><mailto:wcrahen at jlab.org>, Stephen Bültmann <sbueltma at odu.edu><mailto:sbueltma at odu.edu>, Eric Christy <meric.christy at gmail.com><mailto:meric.christy at gmail.com>, Mohammad Hattawy <hattawy at jlab.org><mailto:hattawy at jlab.org>, Ibrahim Hakki Albayrak <dadasibrahim at gmail.com><mailto:dadasibrahim at gmail.com>, Keith Griffioen <griff at jlab.org><mailto:griff at jlab.org>, Nathan Dzbenski <ndzbe001 at odu.edu><mailto:ndzbe001 at odu.edu>

Dear all,

here are a couple of comments on the drawings:
1) For the testing of the panel: Should we just use N2 gas for all tests?
2) For the testing with RTPC (“GEM” should be replaced with “RTPC”): The bottle labeled N2 gas should of course be 4He gas. We should probably also draw a 2nd box (where the blue and dashed green lines meet) and label it “DMS” so we know where the DMS goes.
Other than that, it is my understanding that all we have to agree upon is the set point (and max range) for the pressure reducers PR1 and PR3 (which should be as low as possible but above the minimum allowable threshold for the MFC1 in the case of PR1) and the relieve valves RV1 and RV2 (which should be set substantially higher so we don’t have a creeping gas loss). I don’t see any further issues, but I added a few more people to the cc who might want to add to this.

Greetings - Sebastian

On May 2, 2019, at 2:49 PM, George Jacobs <jacobsg at jlab.org<mailto:jacobsg at jlab.org>> wrote:

Please find attached piping diagrams for testing the RTPC gas system valve panel in the EEL rm 125.

There are 2 diagrams.

The first is for leak checking, completing pressure systems requirements, and verifying the MFC and pressure transducers operate properly.

The second diagram shows a  GEM detector (Gas Electron Multiplier) installed to test the electronics.

Cheers,
George

--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7021
(cell)   757-876-0480
(email) jacobsg at jlab.org<mailto:jacobsg at jlab.org>

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

<DETECTOR GAS LINES.pdf>

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