A plugged impeller symptom or result will be
a) air leaks in suction line and stuffing boxes
b) wrong direction of rotation
c) loss of prime
d) an overheated stuffing box
e) no liquid being delivered
Answer: E
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Power Engineering Chapter 74
- You discover that your feed water pump is not delivering sufficient water. A possible cause is
- If a pump is running and has no discharge pressure, what will you do?
- If pump speed is too high
- If the packing gland of a centrifugal water pump is leaking too much, you should
- Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion, and
- The component of a mechanical seal which prevents axial leakage is
- Any leakage occurring through the surfaces of a mechanical seal will
- 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
- Compression type packing: 1. prevents air from entering the pump 2. reduces the maintenance cost on pumps 3. protects the shaft from scoring and corrosion 4. is used with all mechanical seals
- 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
- A stuffing box: 1. stops air leaking into the casing when the pressure is below atmospheric 2. decreases leakage out of the casing when the pressure is above atmospheric 3. is always supplied with a lantern ring 4. is filled with packing
- Wearing rings: 1. are used on impellers 2. are used on the casing 3. give protection to the shaft 4. reduce the maintenance cost of the pump
- Wear rings are usually constructed of
- Pump wear rings are installed on an impeller by set screws, threading or
- Mechanical seals:
- Most pump troubles occur:
- A slight leakage is desired between the pump shaft and the packing in order to:
- The area around a pump shaft, where packing material is placed to reduce leakage past the shaft, is known as a:
- While a pump is operating, your inspection should include the following:
- Another name for a lantern ring, used in a pump is:
- Compression type packing:
- Before starting a pump, check
- The seal cage on the shaft of a centrifugal pump:
- The main advantage of a pump using a mechanical seal is: