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12-06-2010, 12:30 PM #1
Refrigerant loss from Hansen auto purger
Hello all,
I am faced with a current dilemma that you can help me answer. I work for a plant that has ~50k lbs nh3 charge. Four operating pressure systems, 7"hg, 24psig, 30psig, and condensing of 124-135 (design).
We are currently purging from the condensing pressure, and the suction for our ap24 is at 24psig. The two highest of our four condensor receive 6 purge points each, at 15 min intervals. The two lowest receive 6 purge points ea at 5 min intervals. There is half inch purge line coming from each of the purge points into a common half in header. The total length of each purge line is about 250ft.
Problem: I think I am losing a lot of refrigerant through the purger. Upon observation the bubbler appears to function fine, but short of watching it all day I could not confirm this. It has been suggested that the check valve is faulty, which I will check today. Hansen said that the unit is designed to use a 30# check valve. Sometimes the discharge end of the purger can get up to 32-37 psig for about 20min (from the normal 24psig).
Thanks ahead of time.
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12-06-2010, 05:15 PM #2
Re: Refrigerant loss from Hansen auto purger
The purger would work much better if the suction was piped to your lower temperature suction (7"hg).
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12-06-2010, 11:02 PM #3
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22-07-2010, 05:24 AM #4
Re: Refrigerant loss from Hansen auto purger
There should be three check valves, 1 PSID, 30 PSID and 200/225 PSID.
The check valves are parts that Hansen included in the overhaul kit. So they a wear items. And I have sold a few over the years.
The 1 PSID valve is on the line to the bubbler. Check to make sure it is a 1 PSID and not a 30 PSID. That would explain the high pressure reading. Or it could just be a wore out check valve.
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02-08-2010, 06:24 AM #5
Re: Refrigerant loss from Hansen auto purger
If it is an Auto purger then best to throw it away and fit a NEAP! I have recently done this and my purge problems have almost dissappeared.
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