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A Mass Balance is a means of accounting for the operations/activities of a refinery over a period of time in units of mass. It provides assurance that a balance exists between stock levels, receipts and deliveries. At its highest level the balance is reported for the whole of a refinery but it is prepared from balances obtained at process and storage item level. »Ê¹ÚÌåÓýapp Mass Balance is not concerned with duty liabilities or duty accounting.

Data concerning processes, storage plant and the connections between processes and plants is defined.

»Ê¹ÚÌåÓýapp balance is produced by a computer system which models a refinery’s plant and production processes. Each item of refinery plant which stores, receives and delivers product is defined. »Ê¹ÚÌåÓýapp system is provided with details of every movement in the specified period and by reference to the definitions a balance for each process and storage location can be established.

No refinery will produce a mass balance which has no losses or gains. »Ê¹ÚÌåÓýapp principal discrepancies will arise through the tolerances in measurement devices. With the measurement tolerances of each storage tank and meter defined the system, having identified a discrepancy, will attempt to remove the discrepancy by attributing the loss to measurement tolerances and correct the amounts moved.