Anyone can tell me the difference of suction throttling and discharge throttling? In the centrifulg compressor, what does them really mean? In API-617 compressor datasheet 1st page, suction throttling from ? pisa to ? pisa is a process control method you can chose, what are these two pressures...
When sizing an appropriate motor, although API-610 10Ed 6.1.3 using table 11 indicates that motor power rating as a percentage of the rated pump power, looks like the vendors don't follow API instead of using the pump max power at max impeller diameter as the number to determine minimum motor...
Good discussions!
Dabluffrat, you mentioned that "Rated flow always exceeds Normal flow, and both should always be to the left of BEP flow for a good pump selection". But API-610 5.1.15 says BEP point should be preferably between the rated point and normal point. Can you explain why you think...
We have pump datasheet from the vendor that shows the minimum flow (MCSF)is 21m3/hr, while on the pump vendor IOM manual the set point of the minimum flow for the by-pass valve controller is 34m3/hr, which is 40% of the pump rated flow.
My question is: how to determine the set-point for this...
cvg,
you are correct. The normal/rated flow is from the process engineer during the design stage for size the pump and other purpose only. Pump in the field is actually running within a range. This range shall be in the preferred operating region that pump manufacture recommended on the data...
API-610 10ED/sect 5.1.15 indicates that the pump BEP should be preferably between rated point and normal point. This implies an ideal scenario that the efficiency at normal point is not far away from the rated point on the H/Q performance curve. However the pump vendors are not always doing the...
I have a pump with rated flow is 338m3/hr, normal flow is 270m3/hr, BEP is 342m3/hr. Normal flow is 80% of BEP flow, which is clos to the manufacture recommended operating region lower limit but with a lower efficiency than BEP. Rated flow is 98.7% of BEP.
I am wondering in the field at most...
Recently we had a big problem with a large compressor (27MW)start up using VFD. The issue is that the vendor sized VFD capacity is too small to start the centrifugal compressor from settle-out pressure. Several options were proposed including:
1. Change to a larger VFD, which means a...
I just found why this difference was happened. Although the calculation of the discharge pressure (polytropic process) in GPSA data book does not indicate the limitation of the equation, there is actually a limitation applied, which is the pressure ratio P2/p1 < 1.15. This means the GPSA...
Hi,
I came across a problem when calculating the compressor discharge temperature. When using the GPSA databook to calculate a single stage centrifugal compressor discharge temperature, the result is much higher than that we gained using the simulation software ProII or a compressor sizing...
