Capacity Control Methods
Capacity Control Methods
(OP)
Hello Gents & ladies:
Can anyone advise over the selection of Inelt Guide Vanes Vrs. Inelct suction Throtlling for the Cent. Compressor? how to choose either of them and based on which certain values or aspects you can go either this or this, as our process guys are open on the selection?
Can anyone advise over the selection of Inelt Guide Vanes Vrs. Inelct suction Throtlling for the Cent. Compressor? how to choose either of them and based on which certain values or aspects you can go either this or this, as our process guys are open on the selection?





RE: Capacity Control Methods
so, if long term operating costs are important, then choose the IGV. if up front costs rule the day, then the butterfly valve will likely be less expensive option on the OEM's price sheet.
RE: Capacity Control Methods
RE: Capacity Control Methods
On an integrally geared compressor you could envisage variable IGV at the inlet of each stage, therefore you benefit of a wider flexibility.
On a multistage barrel type, typically you impact the 1st stage inlet only with pre rotation, next stages individual operating ranges could lock your overall range limiting/attenuating the overall benefit. Still for this type of compressor it is an option over variable speed or suction throttling. However for heavy/dirty gas it is not always recommendable to use variable IGVs. In general mechanical reliability should be extensively probed through references.
Also and as advised above, throttling would be an energy consuming option, potentially higher motor sizing, but eventually more robust solution - again a case by case evaluation would apply. The best way in my view for your specific application is to ask quotation to manufacturers for both options IGVs and suction throttling and compare the performance figures.
RE: Capacity Control Methods