An analysis of the optimalization of bucket series against soil removal rate at The Dredger 21 Singkep 1 in PT. Timah (persero) tbk, Bangka Sea Mining Unit of Bangka Belitung Province

Abstract

Dredger 21 Singkep 1 is a ship that serves to conduct excavation of tin ore offshore. The dredger is equipped with digging tools such as bucket, ladder, ladder roll, onder roll and other supporting tools that are connected to become one unit that is called bucket series. The bucket series is the main tool of the excavation process which continuously operates that has an impact on the depreciation of the performance capability of the equipment so that it is necessary to conduct an analysis of optimization of the bucket series in order to operate optimally and the targets of the work plan of the removal rate of the soil can be achieved. Based on the observation and data analysis on the field it is known that the applied ladder suppression is 0.46 meter at the top soil and 0.26 meter at tin-borne layer which results in 229.54 m3 / hour of soil removal rate which is very far from the target of the planned work of the soil removal rate determined by the production team of 389 m3 / hour, so to fulfill the work plan of the LPT the ideal ladder suppression that must be applied is 0.57 meter for top soil and at the tin ore is 0,31 meter, out of this ideal ladder suppression, is obtained the removal rate of the soil of 408.25 m3 / hour. In addition to that, the ideal length of the steek to achieve that removal rate of the soil should be at the average maximum length of 1225 mm.