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29 Cards in this Set
- Front
- Back
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Boyle's law : calculate V2 given P1 = 200 psia, V1 = ft3, and P2 = 500 psia.
V1 X P1 = V2 X P2
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V2 = 0.8 ft3 |
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Combined gas law: calculate T2 given T1 = 313K, P1 = 70 psia, V1 = 300ft3, V2 = 100 ft3, P2 = 420 psia. Give your answer in •C. |
T2 = 626K - 273 •C = 353 •C |
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Convert 27 •F to Rankine |
27 + 459 = 486 •R |
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Covert 200•C to Kelvin. |
200 + 273 = 473K |
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Name two types of positive displacement compressors. |
A. Rotary B. Reciprocating |
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How can you increase the pressure capabilities of a compressor arrangement ? |
By staging the compressor. |
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What causes reciprocating compressor valves to open and close ? |
Pressure differential |
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What is the purpose of an aftercooler ? |
To remove moisture after compression is complete. |
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What three comments required on air receivers by Alberta Boiler Safety Association ? |
A. Safety relief valve B. Drains C. Pressure gauges |
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What is the maximum setting for a pressure relief valve in a compressed air system ? |
It must be set absolutely no higher than the lowest maximum pressure rating of any part in the system. |
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Define " clearance volume". |
Refers to the space between the piston and the cylinder head when the piston is at top dead centre (TDC). |
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Define " clearance pockets" |
A clearance pocket increases the clearance volume to reduce compressor efficiency. |
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What is meant by the term "rod loading" .
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Refers to the sum of the suction and discharge pressures acting on both sides of a double acting compressor piston. |
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Why is rod reversal necessary ? |
Rod reversal in necessary in order to allow oil to floor around the crosshead pin and connecting rod pin brushings and, to a lesser extent, the crosshead guides and connecting rod crank shaft bearing. |
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What type of compressor is shown above ? |
Integral compressor |
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What is the arrow pointing to ? |
Master connecting rod |
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What are the two ways the piston is retained on the rod on a double acting compressor ? |
A. The piston is locked onto the rod against a shoulder.
B. On a taper with a locknut. |
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What is the difference between a single and a double acting compressor ? |
Single acting means that the compression happen on one side of the piston.
Double acting compressor compresses gases on both sides of the piston. So it has twice the number of compression strokes. |
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What are the two types of flow ? |
A. Laminar B. Turbulent |
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What are two functions of the system receiver ? |
A. Dampen pulsation than can damage the system.
B. Supplies storage of product. |
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A single cylinder double acting compressor has a 6" bore and an 8" stroke. The piston rod diameter is 2.5". Calculate the capacity at an operating speed of 1800 RPM: |
Back (Definition) |
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What is the function of the crosshead and guides ? |
The purpose of the crosshead and guides is to keep the piston rod centred through the packing to minimize leakage from the compression cylinder. |
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What is the minimum number of cylinders required for a multi- staged compressor ? |
The minimum number of cylinders is two. |
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What type of compressor is shown above ? |
Integral compressor |
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What is the arrow pointing to ? |
Master connecting rod |
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How many compression strokes per revolution of the crank shaft are generated by each cylinder of a double acting compressor ? |
For every rotation of the crank shaft, there are two compression strokes. |
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Explain the effects of high altitude on a compressor. |
Less efficient. |
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What are the two main types of reciprocating compressor unloads |
Bypass Inlet valve unloading |
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A single cylinder double acting compressor has a 6" bore and an 8" stroke. The piston rod diameter is 2.5". Calculate the capacity at an operating speed of 1800 RPM: |
Back (Definition) |
