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Screw Compressor Operation and Characteristics

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Screw Compressor Operation and Characteristics

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Questions and Answers

What is the primary method of lubrication for a flooded screw compressor?

Oil injection

Water jackets

Circulation under compressed gas pressure (correct)

Timing gears

Why does the high discharge temperature limit the pressure ratio for a dry screw compressor?

To reduce the risk of vibrations in the piping

To increase the efficiency of oil lubrication

To prevent oil degradation

To minimize gas leakage through lobe clearances (correct)

What effect does oil cooling have on the flooded screw compressor's pressure ratios?

Reduces pressure ratios

Maintains pressure ratios

No effect on pressure ratios

Increases pressure ratios (correct)

Why can't a flooded screw compressor be used for food and pharmaceutical industries?

Incompatibility of oil with process gas Signup and view all the answers

What is the primary purpose of timing gears in a dry screw compressor?

Ensure synchronization between screws Signup and view all the answers

What is the main difference between a dry screw compressor and a flooded screw compressor?

The dry screw compressor has its screws lubricated by the compressed air, while the flooded screw compressor has a separate lubrication system. Signup and view all the answers

What is a notable characteristic of a screw compressor in terms of shaking forces?

It is lightweight, simple in construction, and doesn't exhibit large shaking forces. Signup and view all the answers

What is the primary driver used for process service in a screw compressor?

Electric motor Signup and view all the answers

In a P & V diagram of a screw compressor, what does 'Pd' represent?

Discharge pressure Signup and view all the answers

What happens in off-design conditions for a screw compressor?

Energy is lost due to excessive compression in over-compression. Signup and view all the answers