Check Valve downstream Anti Surge Valve
Check Valve downstream Anti Surge Valve
(OP)
Hello Everyone,
I have a simple issue, does any one know the reason of installing a check valve downstream the Anit Surge valve?
One of our vendors is eleminating that valve thinks that it will cause chock, while after we started that Wet Gas Compressor, we faced some high spill back to the Compressor?
Is that eleminated check valve is the reason?
I have a simple issue, does any one know the reason of installing a check valve downstream the Anit Surge valve?
One of our vendors is eleminating that valve thinks that it will cause chock, while after we started that Wet Gas Compressor, we faced some high spill back to the Compressor?
Is that eleminated check valve is the reason?





RE: Check Valve downstream Anti Surge Valve
not sure of the exact location of check valve . . . anti-surge piping or compressor discharge piping?
a check valve is typically installed in compressor discharge piping, downstream of the branch connection to anti-surge valve, to prevent a reverse flow condition through the gas compressor. any/all possibility of reversing gas flow through a compressor should be eliminated. the compressor bearings loads and any labyrinth seals are designed for a specific rotation and load (thrust bearings). changing that rotation may very well be catastrophic to the compressor components.
additionally, if compressor is in parallel with other compressors, not having the check valve may be difficult to bring the compressor online.
if the proposal is to install the check valve on the anti-surge piping, i'm not aware of any purpose.
hope this helps.
-pmover
RE: Check Valve downstream Anti Surge Valve
Ya, my basic question is regarding a check valve typicaly installed after the Anti Surge valve within the recycle line, any purpose?
RE: Check Valve downstream Anti Surge Valve
From "BigInch's Extremely simple theory of everything."
RE: Check Valve downstream Anti Surge Valve
if you want to provide more detail on the actual arrangement of piping and the process, maybe there something strange with your installation than can be assumed from the very scarce amount of detail provided.
good luck
RE: Check Valve downstream Anti Surge Valve
WRT chock - i expect the worry is that when the compressor trips pressure will drop rapidly and the check valve will slam slut, thus breaking the valve. This is a real concern and indeed check valves in gas service often fails.
Best regrads
Morten
RE: Check Valve downstream Anti Surge Valve
From "BigInch's Extremely simple theory of everything."
RE: Check Valve downstream Anti Surge Valve
however, the literal meaning of "check valve downstream of the recycle valve" means to me, installation of a check valve directly downstream of the recycle valve, which would be in the same piping as the recycle valve and this is not where a check valve should be installed.
the original poster might have been trying to describe the discharge check valve which is installed in the piping coming from the compressor. prior to this check valve in the discharge piping, is a tee to which the recycle line is connected. in that recycle line, a recycle valve is installed and the gas is directed back to the inlet. That line is called the recycle piping line. Down stream of this tee, is where the discharge check valve is installed.
if you eliminate this valve, there can be serious problems. the most serious is spinning the compressor backwards after a shut down. stored gas pressure downstream will be allowed to turbine the compressor backwards if the check valve is removed. this can destroy a compressor and cause a catastrophic crash of the machine. if the person thought that the check valve was causing some excess pressure drop (choke as described), then it is necessary to actually measure the pressure drop. most check valves installed will have less than 1 psi of pressure drop which is not very much.
RE: Check Valve downstream Anti Surge Valve
So theres some confusion wr to the desription given by the original poser - does he mean downstream the recycle line branch (on the main line) or does he mean downstream the valve itself on the recycle line.
Best regrads
Morten
RE: Check Valve downstream Anti Surge Valve
From "BigInch's Extremely simple theory of everything."
RE: Check Valve downstream Anti Surge Valve
I meant a check valve on the Recycle line it selft, in series with the ASV
RE: Check Valve downstream Anti Surge Valve