ANALISIS KENAIKAN TEMPERATUR OLI PELUMAS PADA BANTALAN PENYANGGA BAWAH (LOWER GUIDE BEARING) DI UNIT 4 PLTA SINGKARAK

Sari

Singkarak hydro power plant is one of the largest power generation to meet the
electricity needs of West Sumatra with a capacity of 175 MW with four units generating
machine. Unit 4 Singkarak hydro power plant experiencing abnormalities of the lubricating oil
temperature in the lower guide bearing genarator resulting in decreased generation unit
installed capacity of 10 MW and the changing patterns of operation and maintenance. This
thesis aims to find the root of the problem that caused the rise lubricating oil temperature as
well as finding a solution fixes the problem. The method used to analyze using the tool RCFA
(root cause failure analysis) which is an investigation process to determine the main causes of
a failure mode.
From the analysis, we concluded that the formulation RCFA rise oil temparature of
lower guide bearing oil due to low flow rate of lubricating oil resulting decline in maximum
heat transfer is from 71 kW to 45.54 kW and due to the clearance between the bearing of the
shaft does not correspond with the allowed values the manufacturer of the engine when viewed
with shaft deflection values that occurred in unit 4 Singkarak hydro power plant evidenced by
thermal produced (Hg) greater value five-fold in the amount of 14.133 kW.
Keywords: Lower guide bearing, Oli lubricants, Oil flow, Clearance bearings.