We have propylene glycol in our chilled water system which I've read is more leaky than ethylene due to ethylene having a higher surface tension. We've had some questioning on the 6" inlet of the pump dumping into a 4" header and causing a high differential pressure. However, Armstrong says...
Hi,
I have a 120 Ton multistack chiller with two armstrong series 4382 25HP Pumps with 6" inlet and a 6" outlet that immediately gets reduced to a 4" header in the chiller. We have three of these chillers on-site and have found the seals leaking on all the primary pumps of each chiller...
