Method of Coal Quantity Adjustment for Commercial Purpose Using Dry Basis: A Study Case in State-Owned Thermal Power Plant

The difference in cargo quantity between the results of the draught survey in Loading Port and Unloading Port is common in coal trading transactions. However, all parties (suppliers, buyers, and surveyors) agreed on a clause in adjusting the quantity of coal to be paid in case of a difference in a quantity exceeding 0.5%. However, the complicated draught survey process has the potential to cause anomalies in the final result. The anomaly existed once we compare quantity data on a dry basis among both ports. This study aimed to confirm the phenomenon of anomalies and propose alternative methods of adjusting the quantity of dry-based coal. The results of this study had proven that there were anomalies in the correlation of two sets of variables: changes in moisture/changes in coal mass (as-received basis) and changes in moisture/changes in coal mass (dry basis). In the year 2019, existed procedure resulted in only one coal shipment (from a total of 38 coal shipments) subject to quantity adjustment. Otherwise, our proposed method resulted in 16 coal shipments subject to quantity adjustment