INTRODUCTION TO CENTRIFUGAL COMPRESSOR

CONTENTS Introduction (Reciprocating vs. Centrifugal) Theory of operation Main parts Classifications

IntroductionReciprocating Compressor

Centrifugal Compressor

High EfficiencyHigh Vibration

Less Efficiency Less Vibration

MAIN PARTS

MainImpeller

CasingCasing

ShaftShaft Bearing

DiffuserCrossover

Return ChannelDiaphragm

Inlet Connections

Balance Piston Seals

MAIN PARTS Impeller Types

Open Impeller

Semi-open Impeller

Closed Impeller

MAIN PARTS Impeller with Inducer

Reduced inlet Mach Number and ability to increase speed and hence output head

COMPRESOR CLASSIFICATIONSA. According to Casing Split Method1. 2. 3. 1. 2. 3. 4. 5. 1. 2. 3. Horizontal Split Vertical Split Barrel Design Straight In/Out with Inter-Cooler Back-to-Back Double Flow Side Stream Overhung Beam Type (Between Bearing) Integrally Geared

B. According to Impellers Arrangement

C. According to Bearing Configuration

A- Casing Split Method

Vertically Split Good Seal Difficult Maintenance

Horizontally Split Bad Seal Easy Maintenance

A- Casing Split Method

Vertically Split Good Seal Difficult Maintenance

Horizontally Split Bad Seal Easy Maintenance

Barrel Type Compressor

B- Impellers Arrangement 1- Straight Arrangement

B- Impellers Arrangement 2- In/out with Intercooler

B- Impellers Arrangement 3- Back-to-Back

B- Impellers Arrangement 4- Double Flow

B- Impellers Arrangement 5- Side-Stream

C- Bearing Configuration

Overhung Low cost Sensitive to unbalance

Beam (Between Bearing) More expensive More rigid

Integrally Geared

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