1. Gas Compression

2. Two Elements: Driver and Compressor
Driver (Prime Mover)
Compressor

3. Driver Types Internal Combustion Engines Gas Turbines Steam Turbines
Electric Motors

4. Compressor Types Reciprocating Compressors:
Designed for high pressure and low volume applications
Centrifugal Compressors:
Designed for low pressure and high volume applications

5. Reciprocating Compressor
Driver End
Compressor

6. Compressor Components

7. Cylinder

8. Piston and Piston Rod

9. Piston Rings

10. Suction and Discharge Valves

11. Packing

12. Connecting Components

13. Double Acting Cylinder Head

14. Frame Compressors

15. Interstage Cooling

16. Adjusting Compressor Capacity
Speed Control
Some compressors allow speed adjustment.
Reducing the compressor speed also reduces the number of pistons strokes per minute.
This reduces capacity.
Reducing Displacement
Another way to reduce compressor capacity is to reduce the displacement within the compressor cylinder head.
Displacement is the volume of gas that the piston moves as it travels from one end of the cylinder to the other.
This volume is equal to the cross-sectional area of the cylinder times the length of its stroke.
Two methods combined for reducing displacement:
Raising valve lifters
Increasing cylinder clearance

17. Suction and Discharge Valve

18. Raising a Valve Lifter
open
closed

19. Clearance Pocket
Slid 5

20. Bypass Control

21. Lubrication

22. Internal Cooling