Category Archives for Reciprocating Compressors – Components

Reciprocating Compressors – Cylinder Clearance

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 volume between the head of the cylinder and the piston, and the volume under the … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Valve Unloaders

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 depressor-type unloaders and plug-type unloaders. Depressor-type unloaders hold the inlet valve open during both the … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Valves

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 the seat must be greater than the balance spring force before gas may flow through … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Packing

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, which is bolted to the cylinder. The piston rod moves in a reciprocating motion through … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Bearings

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 bearing circumference and builds up an oil film between the stationary and rotating parts … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Piston

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 from materials such as aluminum or cast iron and has a hollow center. Small-diameter high-pressure … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Crosshead, Rods, and Crankshaft

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 crosshead is provided with top and bottom guide shoes, which ride on lubricated bearing surfaces … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: , | Leave a comment

Reciprocating Compressors – Distance Pieces

A distance piece provides the separation of the compressor cylinder from the compressor frame as shown in Figure 11-9. At the top of the figure is a standard distance piece. The piston rod moves back and forth through packing that … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Special Compressor Cylinder Construction

Many variations and combinations of cylinder types and arrangements are available from the compressor manufacturers. The compressor manufacturer will generally make its selection based on the most economical combination it has available. Figure 11-7 is a cut-away of a steeple … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment

Reciprocating Compressors – Frame

The compressor frame, shown in Figure 11-2, is a heavy, ragged casting containing all the rotating parts and on which the cylinders and crossheads are mounted. All frames are rated by the compressor manufacturers for a maximum continuous horsepower, speed … Continue reading

22. September 2009 by Jack
Categories: Reciprocating Compressors - Components | Tags: | Leave a comment