The flow rate is not directly equal to the piston displacement. Volumetric efficiency is the ratio of actual volumetric flow at inlet temperature and pressure…
Category: Compressors
The actual volume of the cylinder that is swept by the piston per minute is piston displacement. It can be calculated from: Single acting cylinder…
Typically, in specifying a unit, the suction and discharge pressures, capacity (MMscfd), inlet temperature, and gas properties are given. The actual sizing of the cylinders…
Clearance is the volume remaining in a cylinder end when the piston is at the end of its stroke. This is the sum of the…
Inlet valve unloaders are used to deactivate a cylinder end and reduce its capacity to zero. Two of the more common types of unloaders are…
The compressor valves control the flow of gas into and out of the compressor cylinder. All valves are similar in that the differential pressure across…
Packing provides the dynamic seal between the cylinder and the piston rod. It consists of a series of Teflon rings mounted in a packing case,…
Most field compressors use hydrodynamic type or “journal” bearings. As shown in Figure 11-12, oil enters into the bearing from supply holes strategically placed along…
The piston is located at the end of the piston rod and acts as a movable barrier in the compressor cylinder. It is generally made…
The crosshead converts the rotating motion of the connecting rod to a linear, reciprocating motion, which drives the piston as shown in Figure 11-10. The…