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19 Cards in this Set
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Lantern rings: 1. Prevent liquid leakage from the pump 2. Are fed by a liquid 3. Provide a seal to prevent air from entering the pump 4. Are mostly used on high lift pumps 1) 1, 2, 3 2) 3, 4 3) 2, 3 4) 2, 3, 4 5) 1, 2 |
4) 2, 3, 4 |
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Packing for pumps: 1) Is used on all pumps 2) Costs more than a mechanical seal 3) Will wear the shaft 4) Protects the lantern ring 5) Is a positive seal |
Will wear the shaft |
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Proper priming and venting of a pump is important, especially if: 1) The medium being pumped contains suspended solids 2) Oil or other low flash point lubricant is being pumped 3) A mechanical seal is used 4) The pump has a stuffing box and lantern ring 5) The medium being pumped is high temperature |
A mechanical seal is used |
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Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion and: 1) Shaft flexing 2) Throttling of the discharge valve 3) Improper installation 4) Loss of lubrication 5) Overloading the pump |
Shaft flexing |
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If pump speed is too high: 1) Discharge pressure will be below normal 2) The pump will lose its prime after starting 3) The driver may be overloaded 4) No liquid will be delivered 5) There will be air or gas in the liquid |
The driver may be overloaded |
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Pump priming is: 1) Done with the suction and discharge valve closed 2) When the pump is partially filled with vapor 3) Done with the suction valve open 4) Filling the pump with gas 5) Done to centrifugal pumps with positive suction head |
Done with the suction valve open
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The liquid to a lantern ring: 1) Should always come from the same pump 2) Keeps grease from leaking out 3) Should be warm at all times 4) Keeps the air out of the pump 5) Should not enter the pump |
Keeps the air out of the pump |
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Compression type packing: 1. Prevents air from entering the pump 2. Reduces the maintenance cost on the pump 3. Protects the shaft from scoring and corrosion 4. Is used with all mechanical seals 1) 2, 3 2) 1, 3 3) 1, 2 4) 1 5) 2, 3, 4 |
3) 1, 2 |
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Lantern rings are used on: 1. Turbine pumps 2. Rotary pumps 3. Reciprocating pumps 4. Sliding vane pumps 5. Centrifugal pumps 1) 1, 2, 3, 4, 5 2) 1, 2, 3, 5 3) 1, 2, 4, 5 4) 1, 2, 3, 4 5) 1, 3, 4, 5 |
1) 1, 2, 3, 4, 5
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The seal cage on the shaft of a centrifugal pump: 1) Distributes sealing fluid to the seal faces 2) Holds the shaft packing against the shoulder of the stuffing box 3) Reduces suction pressure drop 4) Prevents fluid from leaking out of the pump casing 5) Assists in reducing shaft vibration |
Distributes sealing fluid to the seal faces |
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When a pump is operating, your inspection should include the following: 1) You must be sure that the drain valve is open 2) You must be sure that the suction valve is closed 3) You must check the impeller 4) You should check the discharge pressure 5) You should check the oil pressure |
You should check the discharge pressure |
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Wear rings: 1. Are used on impellers 2. Are used on the casing 3. Give protection to the shaft 4. Reduce the maintenance costs of the pump 1) 1, 2, 4 2) 1, 2, 3 3) 1, 2 4) 2, 3, 4 5) 1, 3 |
1) 1, 2, 4 |
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The component of a mechanical seal that prevents axial leakage is: 1) Packing 2) The mating ring 3) The diaphragm 4) The O-ring 5) The seal ring |
The O-ring |
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What size of packing would you use, to repack a pump gland having a stuffing box bore of 8.6 cm and a pump shaft diameter of 6.7 cm? 1) 0.675 cm 2) 0.5 cm 3) 1.6 cm 4) 1.9 cm 5) 0.95 cm |
0.95 cm |
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A centrifugal pump: 1) Can discharge to a very high elevation 2) Can lift a fluid from very deep wells 3) Needs a lantern ring when the suction head is low 4) Will work well with a negative suction head 5) Is mainly used with lubrication systems |
Needs a lantern ring when the suction head is low |
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Mechanical seals: 1. Are used where leakage is objectionable 2. Replace stuffing boxes 3. Provide a better seal than packing 4. Are less costly than stuffing boxes 1) 2, 3, 4 2) 1, 2 3) 1, 2, 3 4) 2, 3 5) 2, 4 |
3) 1, 2, 3 |
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Another name for a lantern ring used in a pump is: 1) Rotating seal 2) Packing box 3) Seal cage 4) Stationary seal 5) Packing ring |
Seal cage |
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If a stuffing box is to prevent the ingress of air, it is equipped with: 1) A seal cage 2) A bushing 3) A thrust collar 4) A vacuum breaker 5) An anti air siphon |
A seal cage |
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Any leakage occurring through the surfaces of a mechanical seal will: 1) Not be visible to the operator 2) Be indicated by pump vibrations 3) Be radial to the shaft 4) Result in an audible sound and be readily noticed 5) Be axial to the shaft |
Be radial to the shaft |
