Some design problems may require determination of maximum flow for a given line size and length, but this is a reverse of the conditions above. Usually either of these conditions requires a trial-and-error approach based on assumed pipe sizes to meet the stated conditions. Flow rate and length known: Determine pressure drop and line size.Flow rate and pressure drop allowable established: Determine pipe size for a fixed length.Artificial lift is also considered during line sizing to improve the operational range of the system. Unlike single-phase pipelines, multiphase pipelines are sized taking into account the limitations imposed by production rates, erosion, slugging, and ramp-up speed. The control factors in the calculation are fluids (oil, gas, or condensate fluids), flowline size, flow pattern, and application region. Hydraulic calculations should be carried out from wells, pipelines, and risers to the surface facilities in line sizing.
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