API MPMS 5.3 pdf download.Manual of Petroleum Measurement Standards Chapter 5—Metering 5.3.5 Flow Conditioning 5.3.5.1 The performance of turbine meters may be affected by swirl and non-uniform velocity profiles that are induced by upstream and downstream piping configurations, valves, pumps, fittings, joint misalignment, protruding gaskets, weld- ing projections, or other obstructions. Flow conditioning shall be used to overcome the adverse...