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Propane Refrigeration Circuit

Propane Refrigeration Circuit

Propane Refrigeration Circuit

(OP)
I have a refrigeration circuit with three stage compressorThere is an orifice in the bypass line. The line is the feed to the comressor suction KOD. I would like to know the purpose of the orifice.

RE: Propane Refrigeration Circuit

I would say its a pressure equlisation line - so that you can open the main block valve with a high dP, thats also why there is a dP across the valve. The orifice is to limit the flow across the by-pass when the dP is high.

Best regards

Morten

RE: Propane Refrigeration Circuit

Since the line is used to purge and prussure up the system you need to control the flowrate.  Most people use an expensive globe valve sized with a proper orifice to obtain a specified flowrate.  Using a properly sized restrictive orifice downstream of a gate vale or ball vale saves money and allows for resizing if the flowrateneeds to be changed in the future.

As a side note, our engineering standards didn't allow purging or pressuring up ethylene systems any faster than 25,000 pounds per hour.  A 1/2" orifice in the 2" or 3" lines worked fine.

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