Check this thread http://www.egpet.net/vb/threads/7192-Tank-Measurements/page3
Dear Achmad, Could you send the following API MPMS sections: 2.1 Introduction to Tank Calibration. 2.3. Calibration of Underground Tanks. 2.4. Calibration of Horizontal Tanks. 2.5. Calibration of Tank Cars and Trucks. 2.6. Calibration of Spherical and Spheroidal Tanks. 2.9. Liquid Calibration. Thanks in advance, If you need other standards let me know, so to share. Walter Segovia