Re: [Fwd: queries on compressor]

thanks George....that was perfect. Just that overview of the steps. I know what you mean about using the vendor supplied software packages, much easier than having to mix and match through catalogs. But then you have learn each one, a pain. Although I've found that once you gotten used to one of them, understanding and using the next is much easier.

The air piping comments were valuable, I generally look more closely at the piping pressure drop, through air friction tables, than the velocities.... but I suppose making sure the pressure drop is significant in itself will keep the velocities low.

thanks again

Jack

At 10:19 AM 11/15/2005, you wrote:
>Morning, Jack:
>You hit a couple of subjects there - only one question per post! Anyhoo:
>Sizing compressors: you hit right dead center of my area there. I have
>sized these things for many years, first as engineer for a major gas
>transmission company, now as a hired gun. My basic approach is:
>Define suction and discharge pressure RANGE - a design point is typically
>not where you end up running. Ditto for flow range. Then, with above,
>start selecting, positive displacement (recip, screw or ?) or
>dynamic/centrifugal. Define driver requirement, engine or motor. The
>pressure/flow range can be really a major decision item - obviously you
>design for full capability at design point, but you try for full load at as
>low differential as possible, plus operation at maximum differential and
>maximum load points. I have compressor modeling programs supplied by most
>of the major equipment manufacturers - they are fantastic for exploring the
>possibilities that salesmen may miss. Then, knowing the approximate
>hardware that will do the job, find several potential compressors, evaluate
>total operating cost (unit, installation, operation and maintenance). From

[Non-text portions of this message have been removed] Received on Tue Nov 15 13:47:00 2005