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DW Distribution > Equipment > Flashcards

Equipment Flashcards

1
Q

This may be happening if the pump sounds like it is pumping “rocks” or make a pinging sound.

A

The pump may be cavitating

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2
Q

Surrounds the pump impeller.

A

Volute case

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3
Q

Used to remove calcium deposits on hypochlorinator equipment.

A

Acid solution

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4
Q

Apparatus used to measure the flow rate from a fire hydrant.

A

Pitot meter

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5
Q

Basic unit of electrical power.

A

Watt

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6
Q

Electricity:

  • Current flow
  • Electrical potential
A
  • Amps or amperes (The symbol for amps is “I”)

- Volts or voltage (The symbol for volts is “E”)

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7
Q

Location of chlorine cylinder fusible plug.

A
  • 150 lb cylinder: In the cylinder valve.

- 1-ton cylinder : Three plugs are located on each end of the cylinder

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8
Q

This should be replaced every time a chlorine cylinder is changed.

A

Washer

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9
Q

This is the change in flow when a second identical pump is turned on, and pumps into a common header.

A

The flow will increase, but never equal twice the capacity of the single pump

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10
Q

Intersection of the pump head-capacity curve (H-Q curve) and the system curve.

A

Pump operating point

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11
Q

The point on a pump performance curve (H-Q curve) where the efficiency is highest.

A

Best efficiency point (BEP)

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12
Q

The schedule rating on plastic pipe is an index of this.

A

Pipe wall thickness

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13
Q

Initial signs of failure in a gear drive mechanism.

A
  • Noise
  • Vibration
  • Excess heat
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14
Q

Throttling (partially closing) the discharge valve on a pump may stop this.

A

Cavitation

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15
Q

Misalignment of the motor and pump shafts can result in this.

A

Vibration and premature failure of the pump and/or motor bearings

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16
Q

Over lubrication of the pump motor can result in this.

A

Bearing failure

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17
Q

these conditions can cause a centrifugal pump to discharge at a reduced rate.

A
  • Plugged or worn impeller
  • Wrong impeller speed
  • Partial plug on suction or discharge side of pump
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18
Q

Gate valves are designed to operate in these positions.

A

Fully opened or fully closed

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19
Q

These devices are designed to measure the water production at a treatment plant.

A
  • Venturi meter
  • Orifice plate meter
  • Propeller meter
  • Pitot meter
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20
Q

Unit installed in a pump stuffing box, to control leakage around the pump shaft. Typically includes rotating carbon and stationary ceramic components.

A

Mechanical seal

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21
Q

Amperage draw on a centrifugal pump motor as the pump discharge valve is closed.

A

the amperage draw will go down

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22
Q

Rapid closing or opening of a valve can cause this problem.

A

Water hammer

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23
Q

Principle of operation of a reduced pressure backflow assembly (RPBA)

A

Water will not flow from a zone of low pressure to higher pressure

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24
Q

Problems associated with pump cavitation.

A
  • Pitting damage to the impeller and pump volute case

- Poor pump efficiency

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25
Q

Materials used as the “sacrificial anode” in cathodic protection of steel tanks and pipes.

A

Magnesium or Zinc

26
Q

Symptoms of a plugged gas chlorine injector head.

A
  • The chlorine flow is zero
  • The chlorine cylinder pressure is normal
  • The vacuum is low
27
Q

Tubercle or scale deposits in a distribution system piping can do this to the Hazen and Williams roughness coefficient (“C” value) for the pipe.

A

The Hazen and Williams “C” actor would be lowered

28
Q

Corrosion that occurs due to the contact of dissimilar metals.

A

Galvanic corrosion

29
Q

Build-up of oxide deposits in steel or iron pipes.

A

Tuberculation

30
Q

Failure of hypo-chlorinator could result from this condition.

A

Build-up of deposits within the hypo-chlorinator

31
Q

Temperature that melts the chlorine cylinder fusible plug.

A

Approximately 158º F

32
Q

“Rule-of-thumb” for maximum daily removal of chlorine from a cylinder.

  • 150 lb cylinder
  • 1-ton cylinder
A

Approximately 1/4 of the full tank net weight per 24 hours
(or)
- 40 lb/day for 150 lb. cylinders
- 400 lb/day for 1-ton cylinders

33
Q

Loss of vacuum to a gas chlorinator could be caused by these problems.

A
  • Plugged injector head

- Loss of water flow to the injector head

34
Q

Check valve used to maintain centrifugal pump prime.

A

Foot valve

35
Q

Rotating component in a centrifugal pump that imparts pressure and flow to the water.

A

Impeller

36
Q

“Rule-of-thumb” for leakage pump packing.

A

One drip per second for each inch of shaft diameter

37
Q

The function of a pump lantern ring.

A

Distribute seal water to the pump packing

38
Q

This can be done to change the rotation direction of a three phase pump motor.

A

Switch any two of the three motor leads

39
Q

Amp readings when three phase motor operates under single phase.

A

Amperage in one leg is very high, and the amperage on the other two legs is zero

40
Q

When one leg of three phase power is lost, the motor does this.

A

“Single phasing”

41
Q

Pumps that discharge into a common header pipe.

A

Operating in parallel

42
Q

Provides proper tension on a pump packing to control leakage rate.

A

Packing gland

43
Q

Function of a seal water supplied to the stuffing box of a centrifugal pump.

A
  • Cools packing and shaft
  • Lubricates shaft
  • Flushes grit and other debris away from the shaft
44
Q

Changes in pump impeller speed have these effects:

  • Pump capacity (gpm output)
  • Pump total head
  • Pump horse power
A
  • Flow increases in direct proportion to the change in speed

- Total head (TDH) increases in proportion to the square of the change in speed

45
Q

A gauge on the suction side of an operating centrifugal pump measures this.

A

Dynamic suction head or lift

46
Q

A gauge on the discharge side of an operating centrifugal pump measures this.

A

Dynamic discharge head or lift

47
Q

This can protect steel tanks and pipes from corrosion.

A

Cathodic protection, using magnesium or zinc as a sacrifical metal

48
Q

Air leaking into suction piping of a centrifugal pump can cause these problems.

A
  • Loss of prime

- Air lock of the pump

49
Q

Pump cavitation is caused by these conditions.

A
  • Too high suction lift
  • Plugged suction line
  • Too high pump speed
  • Warm water temperature
  • Throttled suction valve
  • Significant drop in pump discharge head
50
Q

Materials used for pump packing.

A
  • Jute
  • Hemp
  • Cotton
  • Teflon
  • Graphite
51
Q

Lubrication materials used on equipment should conform to this.

A

Manufacturer’s specifications

52
Q

Stages or bowls are added to a line shaft turbine pump to increase this.

A

The total head that pump produces

53
Q

Operating a centrifugal pump near shut-off for an extended period of time can cause these problems.

A
  • Pump damage due to overheated water, or impeller vibration

- Very poor efficiency

54
Q

Operating a centrifugal pump near runout on the pump curve can cause these problems.

A
  • Motor damage due to excessive amp draw

- Very poor pump efficiency

55
Q

Slow opening valves on high pressure pumps are important to avoid this problem.

A

Water hammer when the pump starts

56
Q

Pumping term for the vertical distance from the inlet water level to the discharge water level.

A

Total static head

57
Q

Normal start amps for a pump motor.

A

3 to 5 times the normal running amps

58
Q

Function of wearing rings on a centrifugal pump.

A

Prevents pump internal recirculation

59
Q

The “C” factor for pipe indicates this.

A

The internal roughness of the pipe (The higher the “C” factor, the smoother the pipe)

60
Q

Suction lift for a centrifugal pump, at sea level:

  • Practical lift
  • Theoretical lift
A
  • Practical lift 15 to 20 ft

- Theoretical lift 33.9 ft

DW Distribution (8 decks)

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