Type of compressor = Centrifugal air compressor
Capcity = 6000 Nm3/hr
Stages = Three stages
Prime mover= Motor of 1 MW
FLC of Motor = 186 Amperes
Problem:
Compressor motor high high current (mpere increased from 148 to 206 A ) & Low pressure side (1st stage) vibration increased from 2.8 to 5.6 um alarms actuated having no effects on high pressure side ( 2nd stage). Also observed that Return lube oil temperature increased from 75 to 120 C and lube oil reservoir temperature increased from 68 to 120C. Inlet lube oil temperature increased from 48 to 57C. On investigation lube oil circuit all accessories found normal i.e. pcvs , thermostatic valve, lube oil cooler & PSV. Moreover, 1st stage bearing housing conditions found absolutely normal.
What could be the reason for increase in lube oil temprature.
Original Post
