[Dsg-rich] RICH gas panel test results

[Tyler Lemon]

Hello, 

This morning Mindy, Marc, George, and I tested the RICH gas panel. Both the nitrogen purge instrumentation and air cooling instrumentation were tested. 

For the nitrogen purge system, we connected the nitrogen dewar to the gas panel. Initially, we were not able to get over 4 liters per minute (L/min) of nitrogen flow as the dewar was not a high-pressure dewar, as ordered. George has already arranged for the correct, high-pressure dewar to be delivered on Wednesday August 16. After noting the dewar was a low-pressure dewar, we swapped the installed pressure regulator with an orifice for a regulator without an orifice. The new regulator without the orifice allowed the nitrogen flow to be set to ~15 L/min. We set the nitrogen flow to 6 L/min and measured the temperature of the gas on the very end of the gas line in EEL 124 cleanroom. The output nitrogen temperature at the end of the gas line was ~69 degrees Fahrenheit. The ambient temperature of EEL 124 was ~72 degrees Fahrenheit. 

For the air-cooling system, we connected the air lines to the gas panel. We set the compressor to automatically turn off if its output pressure reached 70 psi and to automatically turn on if its output pressure drops to 58 psi. The values set on manual instrumentation and the values measured by the mass flow meter are in the table below. To get the flow output to be higher, we had to also increase the pressure to the rotameter using the manual pressure regulator. 

Manual Pressure Regulator [psi] 
	Manual Rotameter [L/min] 
	Mass Flow Meter Measurement [L/min] 

30 
	200 
	200 

50 
	300 
	300 

60 
	400 
	350 

We were not able to get 400 L/min when the manual rotameter was set to 400 L/min. We tried increasing the output pressure at which the compressor turns off from 70 psi to 75 psi, but the pressure at the manual pressure regulator did not go above ~60 psi and the measured flow above ~350 psi. If during the cooling tests, 350 L/min is not enough to sufficiently cool the electronic panel, we could further adjust the output settings of the compressor to try to reach 400 L/min. 

Best regards, 
Tyler 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170814/8332f1ac/attachment.html>