Varying pressure drop for constant flow rate
Varying pressure drop for constant flow rate
(OP)
I'm working with a cross flow membrane at the moment.. what I've noticed is that at lower TMP's, the dP across the membrane is higher, to give me X gpm.
At higher TMP's the dP is lower to give me the same X gpm.
I have 2 flow meters in the line checking the flow, and the X gpm rate is correct. It's also been "bucket tested".
Any ideas?
I'm wonder if it's just gauge error at low/high values on the gauges. We're pumping water, so it's not a compressible liquid at V < 0.3M
At higher TMP's the dP is lower to give me the same X gpm.
I have 2 flow meters in the line checking the flow, and the X gpm rate is correct. It's also been "bucket tested".
Any ideas?
I'm wonder if it's just gauge error at low/high values on the gauges. We're pumping water, so it's not a compressible liquid at V < 0.3M





RE: Varying pressure drop for constant flow rate
Good luck,
Latexman
RE: Varying pressure drop for constant flow rate
RE: Varying pressure drop for constant flow rate
Good luck,
Latexman
RE: Varying pressure drop for constant flow rate
I think it comes down to gauge error for this, but I can't be sure without new gauges for a finer low range.
I'm also wondering if there is a flexing of the membrane. It's a tubular type of module. Basically a paper tube, coated with a membrane...it'd be easy to stress/stretch it IMO.
Have you worked with membranes before Latexman?