JT effect in anti surge valve
JT effect in anti surge valve
(OP)
Hi every body,
Is there any specific reference shows that joule-thomson phenomenon is considered/(or not considered) in design of compressor anti surge valve. The issue is related to natural gas trunk line compressor stations to boost the natural gas pressure by means of centrifugal turbo-compressors.
I asked this question in valve engineering forum but I didn't get a valuable response.
Is there any specific reference shows that joule-thomson phenomenon is considered/(or not considered) in design of compressor anti surge valve. The issue is related to natural gas trunk line compressor stations to boost the natural gas pressure by means of centrifugal turbo-compressors.
I asked this question in valve engineering forum but I didn't get a valuable response.





RE: JT effect in anti surge valve
There is no specific reference AFAIK.
However J T effect should be considered for this duty and calculation.
Cooling across a surge valve is not usually an issue as the gas is hot coming out of e compressor.
If you explain why you're asking the question and the background would help a lot.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: JT effect in anti surge valve
RE: JT effect in anti surge valve
RE: JT effect in anti surge valve
So, do you agree that there is no consideration of temp drop in ASV by designer?
RE: JT effect in anti surge valve
Normally the ASV is sized for a flow to get you higher than surge not full flow. Either way your cooler should be sized for it but you should include for JT cooling.
Some numbers and data might help here.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: JT effect in anti surge valve
On the other hand, the designer should also consider the full recycle case when setting up the design thermal duty for the air cooler. This can become the controlling design case when the machine is operating fixed speed and the compressor suction temp is higher in full recycle mode than the temperature of the fresh feed gas. If this case is missed out, then you could have an air cooler overload situation, and higher compressor discharge temp also.
RE: JT effect in anti surge valve
inlet/outlet pressure : 54/120 bar
comp. in/out size: 24"/24"
recycle line size: 18"
RE: JT effect in anti surge valve
If you're trying to do this by opening up the A/S valve to 100% that's a big waste of energy and doesn't sound like a good plan to me.
can you past the compressor curve and some air cooler data?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: JT effect in anti surge valve
Simulating this recycle case to reach convergence shouldnt be too difficult. You could set up the air cooler in rating mode on the simulator to see if it is up to this duty in the one simulation.
RE: JT effect in anti surge valve
RE: JT effect in anti surge valve
You can always hand sketch the system or black out project info on a compressor curve before scanning it.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.