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I am buying an exhaust purge type regenerative air dryer, installed in the downstream of integrally geared 3 stage centrifugal air compressor. The dryer package consists of pre-filters (dual with isolation valves)and after filters (dual with isolation valve) in the upstream and downstream of...

Is it true that the first stage impeller of a centrifugal is always unshrouded while the other stages can have shrouded impellers? what is the reason for having an open first stage impeller?

Hi All, Attached is a performance curve for integrally geared centrifugal air compressor. Can anyone tell me the meaning of GVA specified on the left? As far as I remember, the different curves are for different speeds of the compressor. Is that...

Our requirement is dry screw compressors, and yes nickelkid, kobelco is also under consideration. Georgeverghese, we would be using a VFD for capacity control. Is there any specific reason for avoiding internal slide valve? How else would this compressor be different from any other process gas...

Can someone please list out some specific things that we need to take care of when doing the engineering for screw type Ethylene Boil off Gas Compressors? How would it be different from any other process gas screw compressor?

I completely agree Artisi and LittleInch. But my process guy has specified a requirement of 15m head whereas his requirement at the pump mounting flange is 12m. It came as a surprise to me as well, as I believe that whatever our requirement is at the battery limit, should be specified. Now I am...

That is what I also believe that the pressure requirement should be specified at our interface with the pump, i.e. flange at the baseplate. However, the pump vendor would select a pump based on the differential head specified by us. For example, if we have specified a TDH of 15m, the pump vendor...

My process engineer says that the pressure that they have asked for is at the interface between the casing flange and discharge pipe. Their actual requirement at the pump discharge pipe flange on the baseplate is lesser than what they have specified (assuming some losses in the discharge pipe)...

When we are buying a VS4 type pump where the discharge pipe is separate and we specify a discharge pressure requirement, does the vendor consider that requirement at end of the discharge pipe flange (top of the baseplate) or at the interface flange between casing and the discharge pipe?