Evaluasi As Final Clearance dan Temuan Rubbing Boiler Feed Pump MHG 6/9 di PT. X

Abstract

Boiler Feed Pump is a critical component in steam generation systems operating under high pressure and rotational speed; therefore, the condition of its internal components requires periodic evaluation. This study evaluates As Final internal clearance against design tolerance and compares the final dimensional condition with rubbing findings on a multistage MHG 6/9 Boiler Feed Pump. An evaluative-descriptive approach was applied using scheduled overhaul data, with the Clearance Record and Part Investigation Record as the main data sources. As Received clearance data were not included in the quantitative evaluation because they were incomplete. The results show that As Final clearances at points B (0.21–0.24 mm), F4 (0.71–0.75 mm), F8 (0.74–0.76 mm), and G (0.46–0.51 mm) exceeded their respective design tolerances. The Part Investigation Record also documented rubbing on the split bearing shell, wear rings, interstage bushing, balance sleeve, throttle bushing, and components of the thrust and balancing systems. Rubbing was also found on components whose As Final clearance remained within the design range. Therefore, dimensional and physical inspections should be used together as complementary information. This study does not establish a causal relationship between pre-overhaul clearance conditions and rubbing.