310204b Gas Compression Flashcards
Which compressor is suitable for oil-free applications?
Diaphragm compressors
How is heat prevented from building up in compressed gases?
Gas coolers
List 2 common types of screw compressors
- Single rotor
- Dual rotor
What is the advantage of the 3 lobe blower?
3 lobe blowers have less noise and vibration.
What kind of compressor is used in pulp and paper Mills for vacuum drying?
A liquid ring compressor used as a vacuum pump
What component of a centrifugal compressor puts kinetic energy into the gas entering the compressor?
The impeller
What condition needs to be avoided in centrifugal compressors?
Surging
What is the term that defines the ratio of absolute discharge pressured to absolute suction pressure?
Compression ratio
At what pressures are reciprocating compressors used
High pressure gasses in excess of 138MPag or 20 000 psig
What pressure are common screw compressors good up to?
Approximately 1MPag or 150psig
What characteristic or attribute of vane compressors makes them suitable for the food industry?
They can be lubricant free
What type of compressor is commonly used for moving material?
Blower compressor
List 3 types of prime movers
- Turbines
- Electric motors
- Reciprocating engines
Name 4 factors that influence the selection of a prime mover.
- Speed
- Power requirements
- Economics
- Customer preference.
What is a common prime mover for home air compressors
Single phase electric.
Why are electrical movers rarely used in the oil patch or on pipelines?
Because they require a reliable source of electrical power
Explain the difference between a power piston and a compression piston
A power piston supplies the force to turn a crank
A compression piston is driven by the motion of the crank
List the two classifications of compressor hazards
- Equipment hazards
- Worker hazards
What are 3 possible injuries that can result from cleaning yourself with compressed gas?
- Eye injury
- Eardrum injury
- Debris or gas penetrating the skin (embolism)
