[Dsg-rich] Fw: Fwd: Re: RICH N2 system automatic backup

Mon Dec 17 10:02:32 EST 2018

thanks for the e-mail tyler

as ed points out and you (tyler)  concur, the process is a finite-state automation.

henceforth, dsg will request the relevant authorities for a DA at the start of a project.

________________________________
From: Tyler Lemon
Sent: Monday, December 17, 2018 9:46 AM
To: Ed Folts; Amrit Yegneswaran
Cc: George Jacobs; Patrizia Rossi; Bob Miller; 'Will Oren'
Subject: Re: Fw: Fwd: Re: [Dsg-rich] RICH N2 system automatic backup

Hello Ed,

For RICH, we have made several changes to the air-cooling and N2 system. For these changes, we have had four DAs and they have all followed different procedure to approve the changes.

>From your email, it is now clear that we need to contact a DA before any preliminary design phase to have their input on the entire design process. We will follow this procedure for any future pressure system modifications or development.

Best regards,

Tyler

________________________________
From: Ed Folts <folts at jlab.org>
Sent: Monday, December 17, 2018 8:19:46 AM
To: Amrit Yegneswaran
Cc: George Jacobs; Patrizia Rossi; Tyler Lemon; Bob Miller; 'Will Oren'
Subject: Fwd: Fw: Fwd: Re: [Dsg-rich] RICH N2 system automatic backup

Hi Amrit

 I believe what Will is trying to point out is that a design authority is required to be involve when a pressure system begins the design stage. It must be approved and documented before the design is finalized and again as it is assembled. Jenord Alston is a good recourse to help with the inspection requirements. This would have been another pressure system violation if Bob had not caught it.

thanks

Ed

-------- Forwarded Message --------
Subject:        Fw: Fwd: Re: [Dsg-rich] RICH N2 system automatic backup
Date:   Fri, 14 Dec 2018 10:44:54 -0500
From:   Will Oren <oren at jlab.org><mailto:oren at jlab.org>
To:     Ed Folts <folts at jlab.org><mailto:folts at jlab.org>
CC:     Bill Crahen <wcrahen at jlab.org><mailto:wcrahen at jlab.org>, Bob Miller <rmiller at jlab.org><mailto:rmiller at jlab.org>

Ed,

Please take a look at the below e-mail train.  It looks like Bob is having to deal with another pressure system that has been modified without DA involvement.  This time from the Detector Service Group.  We need to get this under control.  Remember DA stands for DESIGN authority, not APPROVING authority - of course you know that.

Thanks,

Will

________________________________
From: William Crahen <wcrahen at jlab.org><mailto:wcrahen at jlab.org>
Sent: Friday, December 14, 2018 9:47 AM
To: Will Oren
Subject: Fwd: Fwd: Re: [Dsg-rich] RICH N2 system automatic backup

-------- Forwarded Message --------
Subject:        Fwd: Re: [Dsg-rich] RICH N2 system automatic backup
Date:   Fri, 14 Dec 2018 09:25:34 -0500
From:   Bob Miller <rmiller at jlab.org><mailto:rmiller at jlab.org>
Organization:   Jefferson Lab
To:     Tyler Lemon <tlemon at jlab.org><mailto:tlemon at jlab.org>
CC:     wcrahen <wcrahen at jlab.org><mailto:wcrahen at jlab.org>, Amrit Yegneswaran <yeg at jlab.org><mailto:yeg at jlab.org>

Hi Tyler,

Please send the drawings, pressure systems number, and whatever documentation you have to Bill Crahen and myself.

Bill will be the DA on this project.

Regards,

Bob

-------- Forwarded Message --------
Subject:        Re: [Dsg-rich] RICH N2 system automatic backup
Date:   Wed, 12 Dec 2018 19:39:33 -0500
From:   Amrit Yegneswaran <yeg at jlab.org><mailto:yeg at jlab.org>
To:     Marco Contalbrigo <mcontalb at fe.infn.it><mailto:mcontalb at fe.infn.it>, Patrizia Rossi <rossi at jlab.org><mailto:rossi at jlab.org>, Bob Miller <rmiller at jlab.org><mailto:rmiller at jlab.org>
CC:     dsg-rich <dsg-rich at jlab.org><mailto:dsg-rich at jlab.org>

bob,

please assign a design authority for the analysis and approval of the system.

thanks

amrit

________________________________
From: Dsg-rich <dsg-rich-bounces at jlab.org><mailto:dsg-rich-bounces at jlab.org> on behalf of Marco Contalbrigo <mcontalb at fe.infn.it><mailto:mcontalb at fe.infn.it>
Sent: Wednesday, December 12, 2018 3:33 PM
To: Patrizia Rossi
Cc: dsg-rich
Subject: Re: [Dsg-rich] RICH N2 system automatic backup

Dear Tyler,
thank to DSG for this nice upgrade!
Marco.

On Wed, 12 Dec 2018, Patrizia Rossi wrote:

> Very appreciated Christmas gift!! Thank you Tyler and DSG people!!
> Patrizia
>
> Sent from my iPhone
>
> On Dec 12, 2018, at 3:13 PM, Tyler Lemon <tlemon at jlab.org><mailto:tlemon at jlab.org> wrote:
>
>       Hello,
>
>
>       DSG has developed a system to automatically switch RICH to a back up
>       bank of nitrogen in the event that Hall B's main nitrogen supply is
>       stopped.
>
>
>       The system is designed to use a pneumatic valve operated using the
>
>       pressure from the main N2 supply line that will open if that supply
>       pressure drops. The open pneumatic valve will then allow N2 to flow to
>       RICH from a bank of nitrogen bottles. Attached is a revised RICH
>       nitrogen system diagram showing the new automatic switch-over
>       components.
>
>
>       George has assembled the new components and DSG would like to test them
>       at the beginning of next year after the holidays. To be able to do any
>       sort of testing, the components and test procedure will need to undergo
>       a pressure systems analysis by a Design Authority (DA).
>
>
>       DSG will provide the necessary documentation to the DA once one is
>       requested and assigned.
>
>
>       Best regards,
>
>       Tyler
>
>       <RICH-N2-valve panel-REV2..pdf>
>
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