[Dsg-rich] RICH air cooling pressure system update - Supply Lines and Internal Air Distribution Manifolds

Thu Sep 21 16:44:02 EDT 2017

Hi George, 

Thanks for showing me the manifold today. You are correct that this is indeed a problem. This manifold was also not part of the original design an open ended tube was. This manifold is significantly restricted. With these restrictions the new components will need to be rated at or near 90 psi and designed, fabricated, installed, examined, tested and inspected as required by the Code of construction. 

In my opinion this is an alteration of an existing system. This means that any JLAB design authority can be responsible for it. They will simply need to file the documentation in an alteration folder below the main pressure system folder in DocuShare. 

There will be some work involved but the original system will not have to be inspected or tested if work proceeds this way. 

Unfortunately I most likely will not be able to work on this much. A simple fix would be OK but, most of my time (really all) will be dedicated to the tritium target for the next 3 months. Your solution to the problem seems like a reasonable path forward and I can help with that if everyone agrees to it. More complicated solutions will require another DA to handle the alteration. 

Thanks and good luck 

David Meekins 
Staff Scientist 
Thomas Jefferson National Accelerator Facility 
12000 Jefferson Ave 
Newport News Va. 23606 

Office: 757-269-5434 
Cell: 757-968-9076 

From: "George Jacobs" <jacobsg at jlab.org> 
To: "David Meekins" <meekins at jlab.org>, "dsg-rich" <dsg-rich at jlab.org>, "Amrit Yegneswaran" <yeg at jlab.org>, "Patrizia Rossi" <rossi at jlab.org> 
Sent: Thursday, September 21, 2017 3:20:38 PM 
Subject: Fwd: Re: [Dsg-rich] RICH air cooling pressure system update - Supply Lines and Internal Air Distribution Manifolds 

Hi Dave, 

Bob Miller directed me to you on this. 

The RICH air cooling pressure system does not include the air supply line from the valve panel to the RICH or the distribution manifolds inside the electronics module installed inside the RICH. Pressure in the internal distribution manifold could be as high as 60 psi at full design air flow. Assuming a worse case scenario of the supply pressure regulator failure, it could be as high as 90 psi. 

Plan is to run two 1" OD, 0.813" ID nylon tubes from the panel to the detector, L=60 ft each, to supply the two 1/2" OD internal supply lines and distribution manifolds internal to the detector, L=16 ft each. see attached diagram. 

The manifold will be made from a section of 1/2" OD SS tubing that has the 2mm holes, orifices, drilled in it. 

The 1" OD Nylotube is rated at 230 psi. The 1/2" OD tubing and 1/2" OD SS tubing are both rated > 120 psi. All components have pressure rating greater than the worse case failure scenario. 

Due to the accelerated schedule, we should quickly determine a way forward to complete any remaining pressure system requirements. 

Thanks, 
George 

-------- Forwarded Message -------- 
Subject: 	Re: [Dsg-rich] RICH air cooling pressure system update - Supply Lines and Internal Air Distribution Manifolds 
Date: 	Thu, 21 Sep 2017 14:52:47 -0400 (EDT) 
From: 	Robert Miller <rmiller at jlab.org> 
To: 	George Jacobs <jacobsg at jlab.org> 

Hi George, 

Dave Meekins is the design authority for the RICH. Please meet with him to discuss this issue. 

Bob 

Sent from my iPhone 

On Sep 21, 2017, at 1:22 PM, George Jacobs < jacobsg at jlab.org > wrote: 

Hi Sandro, 

I think the simplest solution is to replace the metric tubing with 1/2" OD nylon tubing to route the air from the patch panel to the air distribution manifold. Then use 1/2" SS tube for the manifolds. These materials are in house. 

George 

On 9/21/2017 11:02 AM, Sandro Tomassini wrote: 

BQ_BEGIN

Hi Jeorge, 

you mentioned the two 10 mm ID internal supply lines and distribution manifolds internal to the detector, unfortunately the OD for these lines is 10 mm and not the ID. 

Best regards 

Sandro 

Il 21/09/2017 16:54, George Jacobs ha scritto: 

BQ_BEGIN
Hi Bob, 

The RICH air cooling pressure system does not include the air supply line from the valve panel to the RICH or the distribution manifolds inside the electronics module installed inside the RICH. Pressure in the internal distribution manifold could be as high as 60 psi at full design air flow. Assuming a worse case scenario of the supply pressure regulator failure, it could be as high as 90 psi. 

Plan is to run two 1" OD, 0.813" ID nylon tubes from the panel to the detector, L=60 ft each, to supply the two 10 mm ID internal supply lines and distribution manifolds internal to the detector, L=16 ft each. see attached diagram. 

The distribution manifold was designed by INFN and produced by a 3D printer. These manifolds are questionable at best. I have suggested that these be replaced with a section of SS tubing that has the 2mm holes, orifices, drilled in it. 

The 1" OD Nylotube is rated at 230 psi. The 10mm ID tubing and 10mm SS tubing are rated > 120 psi. All components have pressure rating greater than the worse case failure scenario. 

Due to the accelerated schedule, we should quickly determine a way forward to complete any remaining pressure system requirements. 

Thanks, 
George 
-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115

(cell)   757-876-0480

(email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg 

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-- 
-----------------------------------------
Dr. Eng. Sandro Tomassini
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
---Research Division---
P.O.Box 13 00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2919/8089
Fax: +39 06 94032256
e-mail: sandro.tomassini at lnf.infn.it http://www.lnf.infn.it/ -----------------------------------------
-- 

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Dsg-rich mailing list Dsg-rich at jlab.org https://mailman.jlab.org/mailman/listinfo/dsg-rich 

BQ_END

-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115

(cell)   757-876-0480

(email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg 

BQ_END

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