Oil Pressure Setting - Ingersoll-Rand CENTAC Instruction Manual

SECTION 3 – OPERATION

Oil Pressure Setting

The Centac compressor lube system is designed to operate between 20 and 30 PSIG
(138-207 kPa). When setting the system oil pressure, attention must be given to both the
prelube pump internal relief valve and the pressure sensing valve (PSV) mounted in the
lube system piping.
The following procedure should be followed to set lube system pressure:
1. Start the prelube pump with instrument air applied to the seals, and the reservoir
filled to proper level with recommended oil.
2. Observe the oil pressure indication on the CMC panel. If oil pressure exceeds
50 PSIG (345 kPa) , shut off the prelube pump and turn the system PSV adjusting
screw (CCW) to reduce pressure.
3. Turn the system PSV adjusting screw (CCW) until a decrease in pressure is
observed on the lube oil pressure indicator on the CMC.
4. Turn the prelube pump internal relief valve adjusting screw (CCW) until system
pressure drops to 20 PSIG (138 kPa) to the casing. Lock down the adjusting
screw. The lube system is now properly adjusted for starting the compressor.
5. Start the compressor.
6. Adjust system PSV to obtain 26 PSIG [179 kPa] (nominal).
7. Lock down adjusting screw.
The above procedure assumes cold oil (65- 80°F [18-27°C]). As oil temperature increases,
adjustments may be necessary to compensate for the change in oil viscosity.
Operation of the unit without proper lubrication can result in overheating of the
bearings, bearing failures, pump seizures and equipment failure exposing operating
personnel to personal injury.
WARNING
Centac Instruction Manual
 2000 Ingersoll-Rand Company
Date of Issue: December, 2003
3.11