• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/21

Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

21 Cards in this Set

  • Front
  • Back
Disadvantages of centrifugal pumps
lack of suction lift
Deflector (Flinger)
a flange or collar around a shaft which rotates with it to prevent passage of liquid along the shaft
Diffuser
A piece, adjacent to the impeller exit, which has passages for converting velocity to pressure
Casing Wearing Ring
a replaceable ring to protect leaking between casing and impeller
Lantern Ring
used to establish a liquid seal around shaft, lubricate stuffing box packing, prevent air into stuffing box
Volute
The expanding spiral case
Overspeed trips are set at...
110% of normal operating speed
Unloading valve
valve located downstream of the pumps discharge to regulate and maintain system pressure
Rotary pumps are...
positive displacement pumps
Advantages of rotary punps
self priming
high suction lift
low maintenance
Reciprocating pumps are...
positive displacement pumps
Mechanical seal
prevents liquid or gas in or out of the pump casing
Mechanical seals are not used on....
centrifugal pumps (lack of lubricating liquid)
After 30 minute run-in period of mechanical seal...
no visible seal leakage is expected
Mechanical seal should be replaced if...
more than 5 drops per minute occurs
Do not use petroleum jelly,TFE, or silicone grease on an.....
elastomer seal
Packing on pumps in use with flammable liquid should maintain a leak rate of...
1 to 5 drops per minute
Stagger packing rings....
90 degrees
Hot alignment
-when unit is aligned at operating temperature
-motor driven units must be run a minimum of 4 hours to get operatimg temperature
Physical adjustments should not be taken until the unit....
has cooled to room temperature
Hot alignment readings taken within....
30 minutes of shutting down machinery