API MPMS 2.2D pdf download.Manual of Petroleum Measurements Standards 3 Definitions For the purposes of this part of Chapter 2 the deÞnitions given in API MPMS Chapter 2.2A and the following deÞni- tions apply. 3.1 reference target point: Fixed point clearly marked on the inside surface of the tank shell wall. 3.2 slope distance: Distance measured from the electro- optical...