Page 400 - Reciprocating Compressors Operation Maintenance

Safety in Operation and Maintenance 385

A. Shut the machine down.
B. Remove power from the motor by opening a manual discon-
nect switch in the power line to the motor. Tag and lock the
disconnect switch so no one will close it accidentally. Do not
rely on the motor starter to cut off the electrical supply.
C. Do not attempt to service any compressor parts without first
relieving the entire system of air pressure.
D. Ensure that the belt wheel has been locked to prevent rotation
and subsequent personal injury.

Periodically, all safety devices must be checked for proper opera-
tion. Use only safety solvent for cleaning the compressor and auxiliary
equipment.
FAILURE TO HEED ANY OF THESE WARNINGS MAY
RESULT IN AN ACCIDENT CAUSING PERSONAL INJURY
OR PROPERTY DAMAGE.

FIGURE 7-2. Continued.

it is important that the pipe manufacturer be aware of the type of com-
pressor oil used. There is no problem if the air is produced in oil-free
compressors.
When plastic ABS pipe is used for compressed air systems, it is
extremely important that the compressor is properly maintained. Cylinder
cooling is important, and when cylinder jackets become fouled, increasing
discharge temperatures will result. Valves must be correctly maintained,
and the compressor not allowed to operate with leaking discharge valves.
Elevated discharge air temperatures would otherwise result.
The aftercooler must also be properly maintained so that the air dis-
charge temperature to the system does not increase. Close control of air
discharge temperatures is necessary as the strength of the plastic pipe
reduces dramatically with an increase in temperatures (see Figure 7-3).

PVC PIPE

Not all plastic pipe is suitable for compressor air systems. PVC pipe
should not be used. Here is an example of what can happen: