API MPMS 4.9.2 pdf download.Manual of Petroleum Measurement Standards Chapter 4—Proving Systems 2.0 Scope This standard covers all the procedures required to determine the field data necessary to calculate a Base Prover Volume (BPV), of either Displacement Provers or Volumetric Tank Provers, by the Waterdraw Method of Calibration. It will enable the user to perform all the activities necessary to...