[Dsg-rich] Back-up N2 system components for RICH

[David Meekins]

Hi Tyler, 

I will not be able to get to this until October or maybe later. One thing that might not be clear though is that the construction of the RICH system is considered complete. If it needs to be altered, than any JLAB DA can do this. The DA for construction is not "The DA" for the life of the system. My suggestion is for you all to find a Hall B DA to take care of this issue in a more timely manner than I can. I will be happy to help that DA when possible. 

Sorry for the inconvenience 

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: "Tyler Lemon" <tlemon at jlab.org> 
To: "Bob Miller" <rmiller at jlab.org>, "David Meekins" <meekins at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Thursday, September 7, 2017 8:07:20 AM 
Subject: Back-up N2 system components for RICH 

Hello Bob and Dave, 

For RICH, the nitrogen purge is used to keep the aerogel tiles inside RICH in a low humidity environment. If the aerogel is damaged due to moisture absorption, RICH will not be able to operate properly. 

Could we arrange for an approved regulator and components to be on hand to be able to switch to a nitrogen dewar or bottle for RICH in Hall B in the event that Hall B's main nitrogen supply goes down? 

As system owner and Design Authority for RICH, we would need to get the list of components and the approval from you to use this back-up system. 

Please let us know how we should proceed in order to get this back-up nitrogen system ready for RICH. 

Best regards, 
Tyler 

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