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pipeline flow modelling/analysis

pipeline flow modelling/analysis

pipeline flow modelling/analysis

(OP)
Anyone have experience with flow equations for natural gas in a circular pipe flowing around an innerduct (annular flow).  Want pressure drop for given flowrate with initial pressure of 10 to 60 psig. Pipe is 1 to 6" IPS  plastic, cast iron or steel.  Innerduct is plastic 1/8" to 1" CTS.

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