Page 155 - Root Cause Failure Analysis

Compressors 143

Figure 10-14 Opposed-piston compressor balances piston forces.

jacketed unit with an aftercooler and outside receiver, the heat radiated to the sur-
rounding air may be 15 to 25 percent of the total energy input, which still is a substan-
tial amount of heat. Positive outside ventilation is recommended for any compressor
room where the ambient temperature may exceed 104°F.

Foundation Because of the alternating movement of pistons and other components.
reciprocating compressors often develop a shaking that alternates in direction. This
force must be damped and contained by the mounting. The foundation also must sup-
port the weight load of the compressor and its driver.

There are many compressor arrangements and the net magnitude of the moments and
forces developed can vary a great deal among them. In some cases, they are partially
or completely balanced within the compressors themselves. In others, the foundation
must handle much of the force. When complete balance is possible, reciprocating