It is an ammonia chiller. It is used in an air separation plant... Nitrogen, argon, oxygen, etc. what I meant by head pressure control is the machine is water cooled condenser and water cooled oil cooler. On chillers we use a modulating valve on the outlet side of the condenser to control water flow therefore control head pressure.
The cooling water was 100 degrees but after some convincing that this wasn't a halocarbon high pressure system they heeded my advise and changed the set point on the modulating water flow control.
Any way the chiller doesn't actually chill water, it has a barrel just like a chiller but is actually chilling air from the air compressors inside, from 70 degrees to about 35 ( 20C-0C approx?)
It pulls all the H20 out of the air
Pretty fascinating plant actually.
I did adjust the hand operated valve because the reduced head changes everything.
Please explain the differentials across liquid make up valves and what purpose they serve
The valve on this machine is ICK20-B (027H1262)
Oh yeah and should I add oil to the separator and then proceed to drain?
Can all this be done to a RUNNING system?