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centrifugal compressor aspen hysys dynamics dynamic simulation gas compressor natural gas antisurge control sizing npv compressor surge pipelines load sharing hysys dynamics optimization performance curves pressure safety valve antisurge valve flow assurance centrifugal pump variable speed drives slug catcher centrifugal pumps api 526 pipeline surge api 521 joukowsky's equation water hammer weymouth equation modified panhandle equation aga equation api 520 spitzglass equation general gas flow equation parallel compressors air quality instrument air surge control settle out temperature electric motor aspentech hysys dynamics calculations settle out pressure electric motor duty hot gas bypass startup emergency shutdown normal shutdown recycle arrangements start-up power fixed speed drives pvtsim engineering multiphase pipeline engineering volute casing end suction single stage radial type euler turbomachine equation pump losses vessel liquid level flow control cascaded split range controller process storage tank liquid level lah lahh calculation hot recycle inertia number surge aspen hysys ratio controller centrifugal compresor control systems blowdown losses drift losses makeup water cooling towers pressure ratio oil fvf separation stages ²µÃ¶°ù api gravity piping insulation heat transfer economic thickness critical thickness pipe sizing flash steam lpg cylinder vessel blowdown net heating value gross calorific value higher heating value lower heating value hydrate formation temperature water surface temperature rate of evaporation schimdt number reynolds number sherwood number evaporation pond thermophysical properties light crude oils evaporation losses homogeneous model oil and gas parts per million chemical process calculations natural gas transmission asme b31.8 api 5l equation of state booster station gas pipeline operating envelopes pump operability bog boil off gas lng liquefied natural gas fan laws two phase flow condensate return lines rstreng dnv rp o0501 asme b31g erosion rate pipeline corrosion irr capm pir wacc pipeline economics pipeline cost unit conversion liquid vessel sizing design basis affinity laws