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vipy
Associate

Join Date: Jan 2008
Posts: 33

VVCP High Speed Reciprocating Compressors

07/13/2010 2:07 AM

We have in our facility a GE Gemini FS 704 high speed natural gas reciprocating compressor.

Its Construction is as follows:

1st Stage compression Cylinder A and B, Discharge pressure 14.5 bar

2nd Stage compression Cylinder A and B, Discharge pressure 46.0 bar

The 1st stage Cylinders have VVCP (Variable Volume Clearance Pocket).

Fixed capacity control is achieved by manual adjustment of Variable Volume
Clearance Pockets (VVCP) on each cylinder. This allows the basic compressor
capacity to be changed efficiently, to suit varying gas compositions, turbine demand
and site conditions.

I need more information on the VVCPs. What is the general construction of a VVCP?

How is it adjusted?

Thanks..
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Pathfinder Tags: Reciprocating VVCP Compressor
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Anonymous Poster
#1

Re: VVCP High speed reciprocating compressors

07/13/2010 2:32 AM

www.geoilandgas.com/businesses/ge_oilandgas/en/prod_serv/prod/compressors/en/hsr.htm
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Kaisan
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Join Date: Nov 2009
Posts: 296
Good Answers: 27
#2

Re: VVCP High speed reciprocating compressors

07/13/2010 5:14 AM

A good look at the drawings for your machine will give you the construction of your particular clearance pocket.

In general a VVCP consists of a cylinder (pocket) with a piston in it attached to the outboard cylinder cover. By moving this piston one increases or decreases the clearance volume of the cylinder. (This only affects the cylinder cover side of a double acting compressor such as yours).

The movement of the piston in the variable volume pocket can be achieved manually or can be automated and hydraulically or pneumatically actuated based on volume or pressure control. Do you have any specific questions on these systems?

__________________
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