This document discusses the calibration of LPG mounded bullet storage tanks. Calibration is defined as determining a tank's capacity and measurement accuracy by recording the volume at various liquid levels. It can be done via dry or wet methods for above-ground or underground cylindrical tanks. Calibrating LPG mounded bullets involves measuring the internal and external volumes, determining the volume based on liquid levels, and ensuring integrated measurement with level instruments. The process features high accuracy inventory monitoring of storage tanks.