Minimum suction pressure
Minimum suction pressure
(OP)
In our FCC unit we have a variable speed centrifugal wet gas compressor, the suction pressure is in the range of (0.7 to 0.9) barg (1.7 to 1.9 barA). My question is what will be the effect if we try to run at lower suction pressure? Below 0.65 barg.
In other word, is there is a minimum suction pressure which should be avoided? Tks
In other word, is there is a minimum suction pressure which should be avoided? Tks





RE: Minimum suction pressure
P(s) = P(d)/R^N
Where R=2 ratios and N=number of stages.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The Plural of "anecdote" is not "data"
RE: Minimum suction pressure
RE: Minimum suction pressure
RE: Minimum suction pressure
1. Established that the compressor could operate at the head and flow at the lower suction pressure. Note that the curves are typically shown in 'actual' versus 'standard' units.
2. In our case the desired operating point could be accomodated, though very close to the surge line on the curves.
3. Given the compressor only had rudimentary surge control facilities, we discussed with suppliers of surge control equipment.
As it turned out, the cost of upgrading the surge control systems wiped out the economic benefit of the lower suction pressure operation.