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Flashcards in Air Compressors and Pumps Deck (295)
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1

Piece of machinery that draws in ambient air, pressurises this air, and delivers in to a holding tank (receiver) or to its end user

Air compressor

2

7 basic components of an air compressor system

Lubricating system
Driving connections
Cooling system
Compressor element
Driving power
Control components
Air receiver

3

Three types of driving power

Electrical motors
Internal combustion engine
Reduction gear

4

Three types of drive connections

Close-coupled
V-belts and pulleys
Reduction gears

5

When the compressor and the driving unit are mounted on the same shaft, they are ___

Close-coupled

6

Close-coupling is usually restricted to ___

Small capacity compressors that are driven by electric motors

7

Sometimes used to join the driving unit to the compressor when the speed of the compressor and the speed of the driving unit are the same

Flexible couplings

8

Drive connection commonly used with small, low pressure, and some medium-pressure motor driven compressors

V-belts and pulleys

9

Three types of compressing elements

Centrifugal
Rotary compressors/blowers
Reciprocating

10

Continuous flow compressor in which the rotating bladed wheels impart a high velocity to the air; the velocity energy developed raises the static pressure of the air without use of valves as it is passed through a diffuser

Centrifugal

11

Positive displacement compressor in which the displacing and compressing elements are interacting lobes, screws, or eccentrically oriented vanes rotating within housings fitted with suction and discharge ports

Rotary compressors/blowers

12

Positive displacement compressor in which the displacing and compressing elements are pistons moving back and forth in a cylinder fitted with suction and discharge valves

Reciprocating

13

Most widely used compressors

Reciprocating compressors

14

Low operating pressure

150 psi or less

15

Medium operating pressure

151 to 1000 psi

16

High operating pressure

Above 1000 psi

17

Ship's Service Air

150 psi or less

18

Start Air, or Diesel Start Air

151 to 1000 psi

19

SSA

Ship's Service Air

20

SA

Start Air

21

DSA

Diesel Start Air

22

Total compression form atmospheric pressure to the final discharge pressure, is accomplished in one stroke of the piston

Single-stage compressor

23

In a two-stage compressor, in ___ of the crankshaft, a compression cycle is completed

One revolution

24

Cylinder designs very widely depending upon ___

The number of stages of compression required

25

Two types of pistons

Trunk pistons
Differential pistons

26

Modified trunk pistons having two or more diametres

Differential pistons

27

Arranged so that more than one stage of compression is achieved by one piston

Differential pistons

28

With a differential piston, compression for one stage takes place over the ___, compression for the other stage takes place in the ___

Piston crown
Annular space

29

The opening and closing of the valves is caused by the difference between ___

The pressure of the air in the cylinder
The pressure of the external air on the intake valve or the pressure of the discharge air on the discharge valve

30

Valves are either ___

Strip (feather) or disk type