1. Parul Institute of Technology
Subject Code :
Name Of Subject : Fluid Power Engineering
Name of Unit : Compressor
Name of Topic : Two Stage Reciprocating Compressor
Sub: FPE Topic: 2-Stage Reciprocating Compressor

2. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Compressor is……….
Compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Compression of a gas naturally increases its temperature.
Compressors are closely related to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are generally incompressible, so the main result of a pump is to move the liquid elsewhere.
Sub: FPE Topic: 2-Stage Reciprocating Compressor

3. Sub: FPE Topic: 2-Stage Reciprocating Compressor
TYPES OF COMPRESSORS
Reciprocating
Fully welded, hermetic compressors
Semi-hermetic compressors
Open-drive compressors
Belt-driven and direct-drive compressors
Screw compressors
Rotary compressors
Scroll compressors
Centrifugal compressors
Sub: FPE Topic: 2-Stage Reciprocating Compressor

4. Positive Displacement Compressors
In positive displacement compressor, successive volumes of air areconfined within a closed space and pressure is increased by reducing volume of space.
Two types of positive displacement compressors:
1.Reciprocating
2.Rotary
Sub: FPE Topic: 2-Stage Reciprocating Compressor

5. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Types of Compressors
Rotary Compressor
Rotors instead of pistons: continuous discharge
Benefits: low cost, compact, low weight, easy to maintain
Sizes between 30 – 200 hp
Types
Lobe compressor
Screw compressor
Rotary vane / Slide vane
Rotary compressors have rotors in place of pistons and give a continuous pulsation free discharge. They operate at high speed and generally provide higher throughput than reciprocating compressors. Their capital costs are low, they are compact in size, have low weight, and are easy to maintain. For this reason they have gained popularity with industry. They are most commonly used in sizes from about 30 to 200 hp or 22 to 150 kW.
Types of rotary compressors include: Lobe compressor, Screw compressor, Rotary vane / sliding-vane. The picture shows a screw compressor
Rotary screw compressors may be air or water-cooled. Since the cooling takes place right inside the compressor, the working parts never experience extreme operating temperatures. The rotary compressor, therefore, is a continuous duty, air cooled or water cooled compressor package.
Sub: FPE Topic: 2-Stage Reciprocating Compressor

6. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Rotary Compressor
Sliding vane Rotary Compressor
Sub: FPE Topic: 2-Stage Reciprocating Compressor

7. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Rotary Compressor
Rotary compressors have rotors in place of pistons and give a continuous pulsation free discharge. They operate at high speed and generally provide higher throughput than reciprocating compressors. They are most commonly used in sizes from about 30 to 200 hp or 22 to 150 kW.
Rotary screw compressors may be air or water-cooled. Since the cooling takes place right inside the compressor, the working parts never experience extreme operating temperatures. The rotary compressor, therefore, is a continuous duty, air cooled or water cooled compressor package.
Sub: FPE Topic: 2-Stage Reciprocating Compressor

8. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Rotary Compressor
Two Impeller Rotary Compressor
Sub: FPE Topic: 2-Stage Reciprocating Compressor

9. Liquid Piston type Rotary Compressor
Sub: FPE Topic: 2-Stage Reciprocating Compressor

10. Rotary Screw Compressor
Use two meshed rotating positive-displacement helical screws to force the gas into a smaller space. These are usually for continuous operation in commercial and industrial applications and may be either stationary or portable. Their application can be from 5 hp (3.7 kW) to over 500 hp (375 kW) and from low pressure to very high pressure (>1200 psi or 8.3 MPa). They are commonly seen with roadside repair crews powering air-tools.
Sub: FPE Topic: 2-Stage Reciprocating Compressor

11. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Rotary Compressor
Screw Type Rotary Compressor
Sub: FPE Topic: 2-Stage Reciprocating Compressor

12. Sub: FPE Topic: 2-Stage Reciprocating Compressor
Thank You
Sub: FPE Topic: 2-Stage Reciprocating Compressor