海上储罐船上货物数量和质量的确定通常是复杂的。有必要准确测量、确定船舶管线、液货舱和污油舱内所有材料的温度、采集样品并计算其数量。船舶上的其他空间也可能包含货物，如压载舱、双层底舱、围堰和许多其他未指定的货舱，所有这些都必须进行检查，并计算其中包含的任何体积。计量责任（数量和质量）必须进一步考虑条件，例如但不限于OBQ/ROB、管线充满度、预压罐检查、封闭式计量和取样系统以及化学品和天然气货物的特殊程序。如果收益或损失超过预期公差，可能需要对上述内容进行调整。执行所有这些操作的详细要求包含在多个MPMS标准中。 本出版物确定了在原油上执行这些程序的方法；石油产品；化学品货物；液化石油气（LPG）和液化天然气（LNG），通常装在海上储罐船上；并指导用户使用MPMS标准套件中的适当标准/指导文件

The determination of the quantity and quality of cargo on board marine tank vessels is frequently complex. It is necessary to accurately gauge, ascertain the temperature of, collect samples of, and calculate the amount of all materials contained in the vessel’s lines, cargo tanks, and slop tanks. Other spaces on the vessel may also contain cargo, such as ballast tanks, double bottoms, cofferdams, and numerous other nondesignated cargo spaces, all of which have to be checked, and any volumes contained in them calculated. Measurement accountability (quantity and quality) has to further take into account conditions such as, but not limited to, OBQ/ROB, line fullness, preloading tank inspection, closed measurement and sampling systems, and special procedures for chemical and gas cargoes. Reconciliation of the foregoing may be required if gains or losses exceed expected tolerances.The detailed requirements for performing all of these actions are contained in numerousMPMSstandards. This publication identifies the methods for performing these procedures on crude oils; petroleum products; chemical cargoes; LPG and LNG, normally carried on board marine tank vessels; and guides the user to the appropriate standard/guidance document within theMPMSsuite of standards