How to plot actual compressor performance on manufacturer' performance
How to plot actual compressor performance on manufacturer' performance
(OP)
Hi everyone, this is my first post. I hope we can help each other out.
I have problem on plotting the actual compressor performance on manufacturer' performance chart. Can someone guide me?
Please see the attached file for detailed information.
Thanks,
EP
I have problem on plotting the actual compressor performance on manufacturer' performance chart. Can someone guide me?
Please see the attached file for detailed information.
Thanks,
EP





RE: How to plot actual compressor performance on manufacturer' performance
basically, obtain the inlet/outlet process conditions and gas composition and then determine compressor inlet flows and the head developed. plot the data point and compare actual compressor rpm to that of predicted. they should be nearly the same provided the actual gas composition is relatively close to that of the predicted composition to develop the curves.
good luck!
-pmover
RE: How to plot actual compressor performance on manufacturer' performance
The situation is:
on the actual operating performance:
The compressor needs to run on 13485 rpm in order to achieve the expected flow of 9328CFM with the Hisen of 64678 ft-lbf/lbm.
ideally (according to the mfg performance map):
the compressor originally can run on 11650 rpm[/COLOR][/B] with these conditions (Flow=9328CFM and Hisen=64678 ft-lbf/lbm).
Summary:
The unit needs more power to deliver the expected flow. it means the unit is not so efficient as before, there is LOSS of ENERGY on the unit. As an indication, the unit has high discharge temperature. (Energy loss --> heat).
Another question: what are the possible causes to this "MORE POWER/SPEED"?
please see the attached file.
Gruss,
EP
RE: How to plot actual compressor performance on manufacturer' performance
David
RE: How to plot actual compressor performance on manufacturer' performance
gruss,
EP
RE: How to plot actual compressor performance on manufacturer' performance
I now understand that gas with different MW or SG (if it out of tolerance off-course), should have different performance map.
my question:
if the situation I explained above has had the same specific gravity, how about that?
to be clear:
SG actual = SG design
Head(isen) actual = Head(isen) design
Flow actual = Flow design
but
Speed actual > speed design
(let's say delta speed is 10~15%)
what does it mean? what indicates this situation?
gruss,
EP
RE: How to plot actual compressor performance on manufacturer' performance
fyi
RE: How to plot actual compressor performance on manufacturer' performance
mfg,
EP
RE: How to plot actual compressor performance on manufacturer' performance
after my initial posting, i thought about my response and realized my error . . .
that is the compressor curve (isen head vs acfm) will not drastically change even with a different moleweight of gas as the compressor wheel will generate that amount of head at the specified inlet flow conditions and rpm. what will change are the compressor outlet conditions; thus the overall calculated head. do understand that due to the heavier MW gas, the compressor will operate at a different speed than originally designed. i believe this may be a little confusing, so i am attaching an article that may further assist you. take your time reading it and i hope this helps.
been having internet comm problems lately; hence this late follow-up posting.
hope this helps.
-pmover
RE: How to plot actual compressor performance on manufacturer' performance
RE: How to plot actual compressor performance on manufacturer' performance
thanks to you pmover.