[Dsg-rich] RICH backup N2 manifold installation

[Tyler Lemon]

Hi Denny and Bob,


Could you send us a revised P&I diagram showing the changes made to George's latest version (attached in my previous email)?


We would need an up-to-date version showing the changes we discussed today and how the backup manifold is connected to the two N2 banks.


Best regards,

Tyler


________________________________
From: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Tyler Lemon <tlemon at jlab.org>
Sent: Friday, February 1, 2019 10:11:22 AM
To: Denny Insley; Bob Miller; dsg-rich
Subject: [Dsg-rich] RICH backup N2 manifold installation


HI Denny,


Just to review what we talked about in the hall this morning and get some clarification from you:


You all are moving the two 12-bottle N2 banks to the top of the pi tower and will run a gas line from there to the RICH N2 panel. Bank #1 will have a regulator set to ~20 psi and Bank #2' regulator will be set to ~10 psi. This will allow gas to be supplied from Bank #1 until its pressure drops below 10 psi, at which point, Bank #2 will start to supply N2.


Using the attached drawing as a reference, you're going to install the new backup manifold at MV4 rather than what is shown in the drawing. The house N2 supply will remain connected to and flowing through MV1.


Once the backup manifold is installed, DSG will run the cabling for the pressure transducers on the manifold to the hardware interlock cRIO and move the house nitrogen from MV1 to the new backup manifold at the connection point labeled "N2 Gas From 96B".


We want to make sure that whatever the plan is for the installation from the manifold, that N2 flow to RICH not be stopped for more than a few minutes. Since we discussed that MV4 will remain valved off until DSG runs the PT cables, can you all be sure to leave the house N2 supply line attached to MV1 and flowing after you all install the backup manifold?


Thanks,

Tyler
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