[Dsg-rich] RICH gas panel test results

[Tyler Lemon]

Hello George, 

Thank you for the information. 

Taking what you say, we should plant to test the compressor with a higher output pressure set point to see if we can get a higher flow. 

Best regards, 
Tyler 


From: "George Jacobs" <jacobsg at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org>, "dsg-rich" <dsg-rich at jlab.org> 
Sent: Tuesday, August 15, 2017 1:36:14 PM 
Subject: Re: [Dsg-rich] RICH gas panel test results 

In normal operation the compressor will operate in automatic. There should be no issue with the compressor running at it's maximum set point. Lowering operating pressure also reduces the cooling capacity of the system due to a power outage. 

The receiver relief valve is set to 175 psi, it is not possible for the compressor to overpressure the receiver or panel. 

The 90 psi relief valve on the panel is to protect the glass flow meters from overpressure in case of pressure regulator failure. These reliefs do not see receiver pressure unless the regulators fail in what would be a worse case scenario. 

Resistance to flow in a gas line is linear with length. For a realistic test, 50 ft lengths should be used. We may find that 2 tubes may be required per sector to maximize cooling flow. 

There are certain critical system design parameters that should be verified. These critical parameters all deal with the cooling flow capacities. IMO, the following should be measured in order to verify the system will work in the hall as expected when installed.; 
-> Max cooling flow rate for 1 detector 
-> Max cooling flow rate for 2 detectors 
-> Max Power outage flow and time for 1 detector 
-> Max Power outage flow and time for 2 detectors 
-> Min Power outage flow and time for 1 detector 
-> Min Power outage flow and time for 2 detectors 

George 

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