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56 Cards in this Set
- Front
- Back
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What type of valve is good for high flow? |
Concentric ring valve |
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What are the three types of connecting rods? |
Straight Bias Articulating or king rod |
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Which two valves have a feature that cushions the sealing element as it moves? |
Dampened disc Channel valve |
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Which principal talks about the relationship between the velocity and pressure of a half lowing through a pipe |
Brinpulles principal |
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On a singe acting compressor what components from the barrier between the gas side and the oil side |
Compression and oil rings |
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How would the compression ring end gap be measured? |
By placing the ring in the cyl and measuring the gap with a feeler gauge |
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What category does a single acting compressor for into? |
Positive displacement |
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What is the basic principal behind the dynamic compressor |
It increases the velocity of the air and then in the piping, as the air slows down, the pressure increases |
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In order for gas to flow what must there be? |
Pressure differential |
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What measurements does the channel valve need? |
Side End Lift |
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What is the dowel or tab on the connecting rod bearing shells? |
To stop the shell from rotating in the bore |
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What should the clearance between the piston and the head of the cyl be set to? |
1/3 near crankcase 2/3 at the head |
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What are the 2 sub classifications of positive compressors |
Rotary and reciprocating |
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What is the relationship between kinetic and potential energy called? |
The law of conservation of energy |
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What is valve lift |
The distance the sealing element moves from open to close |
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Describe valve flutter |
Flutter is a condition where the sealing element rebounds off the valve seat |
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If the compressor is compressing a hazardous gas what type of distance piece is used? |
Two compartment |
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What type of piston is used in the single acting compressor? |
Trunk type |
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At seal level the atmospheric pressure is 14.7 psia. What causes this pressure? |
The weight of the air in the atmosphere |
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How is the labyrinth compressor different from the double acting compressor? |
It has labyrinth seals on the piton instead of rings and also has a guide bushing for the piston rod |
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What are the two main classifications of compressors |
Dynamic and positive displacement |
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What is the purpose of the crosshead? |
To align the piston rod through the packing |
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Describe a vacuum |
A vacuum is a condition where the pressure inside a container is less than the pressure outside the container |
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What component in the distance piece forms a barrier between the lubrication and the cyl |
Wiper rings |
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What is the function of the packing in a double acting compressor |
Prevent leakage of compressed gas along the piton rod |
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Why should the cyl be measured at multiple locations |
To check for taper, out of round, hour glass shape |
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Unless otherwise stated the marks on the packing face ... |
The pressure side |
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Which packing ring does the majority of the sealing in a single acting ring set |
Tangent cut ring |
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What two things can be measured with a bump check? |
Axial and radial clearance |
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Define clearance volume and what's it's for |
Space between the piston and the head when the piston is at TDC. It prevents the piston from contacting the head |
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What is the purpose of the back up ring in the packing set |
To provide support to the tangent and radial cut ring |
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What should be done on a lubrication or cooling system after they have been serviced? |
Prime and clear out air pockets |
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What are the two things that can be done to balance the reciprocating forces in the compressor |
Opposing throws or counter weights or lighten components |
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What is the order of the packing sets in the packing case starting at the flange side |
-double acting set -single acting set -pressure breaker |
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What component on a compressor helps increase efficiency and is located in between the stages |
Intercooler |
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If the clearance volume is increased with the VVCP, what will happen to the output of the compressor |
The output volume will decrease |
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When comparing start stop unloading to inlet valve unloading, which will be more common on large compressors? |
Inlet valve unloading |
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Where should the pressure reliefs valve be located on a compressor system |
Between the compressor/cylinder and any part that could be blocked off (between anything that builds pressure and anything that can block it) |
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If the lubrication system pressure drops, what could be the cause |
Bearing wear causing the clearances to open up |
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What can be done to check if the bearing supports on the frame are all inline with each other |
Wire alignment |
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What are two types of lubrication systems on a single acting compressor |
Splash, splash and pressure, splash and gravity, and full pressure |
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What is the proper procedure before working on a compressor that is pumping sour gas? |
Permits, purge, shutdown, vent, lockout then test for operation |
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Card # 51 |
Finished |
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What are three things that can cause bearing failure? |
-lack of or improper lube -misalignment -improper installation -excessive rod loading - corrosion -acid formed in the compressed air |
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Measuring the web deflection of the crank shaft will tell us what? |
If the crank shaft is straight or not |
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Where would a rigid be used? |
The rigid hone is to make the cyl walls parallel to each other |
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Why are the packing and wipers designed to be full floating? |
To allow movement due to thermal expansion rod wear packing wear and packing rotation |
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What can be done to the cyl to ensure the frame and distance piece are not supporting its weight? |
They can be supported to a specific preload to compensate for thermal growth |
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What is a disadvantage of a pump to point system |
Each individual pump requires its own shut down device |
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Which type of cyl is most common in industrial compressors |
Dry liner cyl |
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High turbulent flow down a length of a pipe will cause what? |
Pressure drop |
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What part is often cast as part if the main frame? |
Crankshaft main bearings |
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Damaged suction valves will cause what symptoms in a compressor? |
-increasing noise -vibration -discharge temp is higher |
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A paper element removed particles down to what size? |
3 microns |
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What is responsible for converting rotary motion to reciprocating motion? |
The crankshaft and con rod |
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What is the main purpose of the crosshead? |
Centre to piston rod in the packing |
