What is a reasonable back-flow through a check valve?
What is a reasonable back-flow through a check valve?
(OP)
I vaguely rememeber something perhaps in an older version of API-520 that suggested a reasonable flowrate through a leaking check valve was 10% of the normal forward flow. Has anyone seen anything like this?
Almost Broken





RE: What is a reasonable back-flow through a check valve?
If "here" is a full-flow bypass around a compressor, then leakage impacts system effeciency but doesn't usually have a major impact on system performance so quite a bit of leakage is often acceptable.
If "here" is downstream of a centrifugal pump, then any leakage below the threshold of rotating the pump backwards it probably OK. Your 10% number probably works here (and that is likely where it came from).
If "here" is downstream of a meter run, then leakage below the measurement threshold is OK (a smaller number than the pump case).
If "here" is under a PSV on a vessel that can operate in a vacuum then the acceptable leakage is even less (since people have so little tollerance for air in pressurized systems).
David
RE: What is a reasonable back-flow through a check valve?
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: What is a reasonable back-flow through a check valve?
RE: What is a reasonable back-flow through a check valve?
David