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David/CCFowler, Thanks for all the info - sounds like you guys have quite a bit of experience with compression. Im wondering, for gas gathering systems, what percent of installations would you say are recips versus centrifugals? Are centrifugals more commonly used in offshore applications or...

Can anyone please tell me the relative benefits & drawbacks of reciprocating vs. centrifugal compression. Also, which ones are more common for offshore/onshore applications? thanks, Mack

Pete is correct in that the presense of emulsions can significantly affect the bulk liquid viscosity thereby increasing the pressure loss in the flowline considerably. Fortunately, PIPESIM allows users to apply the Woeflin correlation to calcuate the oil-water emulsion viscosity used for any...

A1J2, I can suggest 3 approaches to estimate the size of a slug catcher. You may want to take the largest of the 3 and apply an appropriate safety factor: 1) As posted previously, the volume of the statisically largest 1/1000 slug. 2) Volume swept by pig (sphere), also posted previously 3)...

Ahmed, I would recommend PIPESIM for modelling 2-phase flow. It includes rigorous flash calculations and flow correlations that work particularly well for low liquid loading pipelines. See: http://www.sis.slb.com/content/software/bakerjardine/products/pf2000.asp Regards, Mack

Has anyone with experience in applying equations of state (ie. Peng Robinson, Souave Redlich Kwong, BWRS etc.) have any thoughts as to which ones perform best for different ranges of conditions (ie. low pressure, high pressure, light or heavy mixtures etc.)? thanks Mack