(a) Every 2 weeks, turn the compressor over by hand to distribute oil t o
those areas requiring lubrication, then operate the compressor for a minimum
of 2 hours. This will keep the interior dry, well lubricated, and prevent
absorption of moisture by the blades.
(b) Do not allow cooling water to run after shutdown. This causes
internal condensation that can be absorbed by the blades.
(c) If the compressor is to be subjected to freezing temperatures,
thoroughly drain cylinder jackets, coolers, and drain traps.
5 OPERATIONAL PREVENTIVE MAINTENANCE. Operational preventive maintenance
includes the following tasks.
(a) Keep a daily log of compressed air and cooling water temperatures
and pressures, and lubricating oil additions to detect any deviations from
normal operating values. On two-stage machines,low interstage pressure
indicates a malfunction in the first stage or stoppage of the intake filter.
High interstage pressure may indicate that the second stage is not operating
properly or that the air from the first stage is not being cooled sufficiently
by the intercooler.
(b) Keep the machine clean at all times by wiping daily with a cloth.
Dirt accumulations will eventually work their way into the machine and cause
(c) Do not operate a compressor beyond its rated capacity. Overload
operation results in overheating and damage to running surfaces.
(d) Do not overtighten packing gland. This results in rapid packing
wear and shaft scoring. Gland should be pulled up finger-tight and some oil
leakage should be present.
(e) Check lubricator weekly for proper drop rate.
6 PREVENTIVE MAINTENANCE INSPECTION. The following inspection schedules are
adequate for average installations.
6.1 Daily Inspection. The operator shall inspect the installation daily for
the following conditions:
(a) Unusual noise or vibration
(b) Abnormal pressures or temperatures
(c) Proper lubricating oil levels
(d) Abnormal stuffing box temperatures
(e) Abnormal bearing temperatures
(f) Overheating of motor