Best location of Anti-Surge Valve
Best location of Anti-Surge Valve
(OP)
Hi All,
what is the best practice in Anti Suge Valve location in Centrifugal Compressor package?
I had seen some applications where the Anti Surge valve is upstream the Dischage cooler, while my Company common practice is downstream the Dischage Cooler.
Do you think there is any advantage for any of them.
Thanks for Your replies
what is the best practice in Anti Suge Valve location in Centrifugal Compressor package?
I had seen some applications where the Anti Surge valve is upstream the Dischage cooler, while my Company common practice is downstream the Dischage Cooler.
Do you think there is any advantage for any of them.
Thanks for Your replies





RE: Best location of Anti-Surge Valve
typically, anti-surge valves are located as close the the compressor outlet to reduce system resistance; thus allow minimal compressor flow conditions to be met. for an installation with gas coolers, the anti-surge valve should be installed downstream of the gas cooler to allow for anti-surge protection under all operating modes. the anti-surge valve should be located as close to the gas cooler outlet piping as practical. again, the objective is to reduce the system resistance across the centrifugal compressor to maintain a minimal flow through the compressor.
if the distance from the compressor outlet to gas cooler outlet is lengthy, then consideration may be given for a dedicated gas cooler downstream of anti-surge valve. the gas cooler need only be sized for a flow required to meet process &/or minimal compressor flow conditions. this additional gas cooler has an economical impact on the project and needs careful consideration. there are some processes in which these coolers installed. each application/process will need to be evaluated.
hope this helps.
-pmover
RE: Best location of Anti-Surge Valve
Thanks for your advice, but throttling through the anti surge valve has a cooling effect.
shouldn't be considered?
Regards
RE: Best location of Anti-Surge Valve
RE: Best location of Anti-Surge Valve
http://webbook.nist.gov/chemistry/fluid/
good luck!
-pmover
RE: Best location of Anti-Surge Valve
There is much more risk for this anti-surge problem in multistage compressor than that in single stage compressor. Therefore, it is difficult to control only one recycle (or bypass) line with one anti-surge valve (from compressor discharge back to compressor inlet) for this anti-surge compressor.
Because each stage compressor unit has very different operation pressure and temperature, it is very hard and expensive to use only one recycle line with one anti-surge valve to control many units at the same time in the multi-stage compressor.
The most expectable solution is to install recycle line with one anti-surge valve in each unit(from discharge to inlet) in multi-stage compressor.
Hope this help.
Thanks.
RE: Best location of Anti-Surge Valve