Manual of PetroleumMeasurement StandardsChapter 2-Tank CalibrationSection 2D-Calibration of Upright CylindricalTanks Using the Internal Electro-optical Distance-ranging MethodFIRST EDITION,AUGUST 2003REAFFIRMED,NOVEMBER 2020ERRATA 1,JANUARY 2021AP刘AmericanPetroleumInstitute