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Pumps Flashcards

1
Q

What are the two classifications of positive displacement pumps?

A

Reciprocating and Rotary

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2
Q

A plunger pump is often found in a situation requiring what?

A

Measured flow

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3
Q

Piston and plunger pumps are best suited for what?

A

Low flow and high suction lift.

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4
Q

A double acting pump discharges fluid when?

A

On every stroke

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5
Q

The type of sealing mechanisms are used in plunger pumps?

A

V or U ring packing

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6
Q

Which check valve is used for moderate to high pressures?

A

Wing-guided

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7
Q

What is the term for the vertical distance from the liquid supply level to the surface of the liquid in the discharge tank or point of discharge?

A

Total static head

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8
Q

Name a pump that can function in explosive enviroments.

A

Pneumatic Diaphragm Pumps

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9
Q

The _______ has two opposite rotated, externally cut gears inside one casing.

A

External gear pump

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10
Q

The gears of an internal gear pump are seperated on one side by a _________.

A

Cresent

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11
Q

The ______ has two rotors in a casing with a set of external timing gears which synchronizes them.

A

Lobe Pump

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12
Q

Wear rings are found in a centrifugal pump attached to ________.

A

The eye of the impeller and the casing.

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13
Q

A mixed flow impeller is used to convert _______.

A

To convert axial fluid flow into radial fluid flow.

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14
Q

The maximum theoretical depth that a pump can “lift” water is approximately _______.

A

34ft

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15
Q

In a centrifugal pump, the purpose of the volute in the discharge is to _______.

A

Increase Output Pressure

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16
Q

The flow from a rotary style positive displacement pump is considered to be what?

A

Continuous and Smooth

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17
Q

A fixed displacement pump will always provide what?

A

Constant volume at a given speed.

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18
Q

What type of vane pump only has one sliding vane?

A

An external vane pump

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19
Q

A single screw pump consists of what two parts?

A

Rotor and Stator

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20
Q

How many rotors does a lobe pump have?

A

2

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21
Q

What application are centerline mounted pumps best suited for?

A

Pumping hot fluids

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22
Q

What type of impeller has the lowest specific speed?

A

Radial Flow

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23
Q

What should the area of a suction strainer be relative to suction piping

A

3 - 4 times larger

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24
Q

What is a major advantage positive displacement pumps are considered to have?

A

They are self-priming

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25
Q

How many check valves are in a single acting piston pump?

A

2

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26
Q

What is scalloping?

A

The removal of material between vanes.

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27
Q

What is the most common type of centrifugal pump in the industry?

A

Single stage end suction

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28
Q

What is the shape of the case that the rotor of a balanced vane pump turns inside of?

A

Elliptical

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29
Q

What type of pump has a part named stripper?

A

Regenerative Turbine

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30
Q

What is another name for a flexable tube pump?

A

Peristaltic

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31
Q

The number of stages a pump has is determined by what?

A

Number of impellers

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32
Q

The blades of an impeller are designed to what?

A

Push Fluid

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33
Q

Suction head is a condition where __________.

A

Surface level of source of supply is above pump centerline.

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34
Q

When the shaft assembly can be removed without disturbing the piping, in all cases, the casing is said to be:

A

Horizontally Split

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35
Q

The inlet pipe to a pump is usually greater in diameter than the discharge pipe. The reason for this is:

A

Get more fluid into the pump than can be discharged.

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36
Q

A shaft sleeve is used on a pump shaft to ____________.

A

To prevent wear on the shaft.

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37
Q

Mechanical Seals allow what?

A

Allow invisible or minimal leakage

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38
Q

What are the two basic classifications of pumps?

A

Dynamic and Positive Displacement

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39
Q

What is a Dynamic Pump?

A

A machine that moves fluid by using centrifugal force to spin it outwards.

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40
Q

What type of flow do Dynamic Pumps produce?

A

Smooth and Continuous

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41
Q

Do Dynamic Pumps convey large volumes or small volumes?

A

Large Volumes

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42
Q

What is another name for Dynamic Pumps?

A

Centrifugal Pumps or Non-positive Displacement Pumps

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43
Q

What do centrifugal pumps allow water to do which dictates it be called a Non-positive Displacement Pump.

A

The water can slip after the required pressure is built up.

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44
Q

How is slip created in a Dynamic Pump?

A

Created when the impellers centifugal force is the same as the resistance to in the discharge pipe.

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45
Q

What are the four categories of centrifugal pumps based on?

A

Different types of flow; Axial, mixed, radial, and peripheral.

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46
Q

What is Pump Head?

A

The pressure that a pump has to overcome to be able to move liquid through the system.

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47
Q

What are the three units which express pressure?

A
  • PSI
  • kPa (Kilopascals)
  • Bars
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48
Q

What is Static Suction Lift?

A

The vertical distance from the liquid supply level to the pump centre line when the liquid supply level is below the pump centre line.

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49
Q

What is Static Suction Head?

A

The vertical distance from the liquid supply level to the pump centre line when the liquid supply level is above the pump centre line.

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50
Q

What is Static Discharge Head?

A

The vertical distance from the pump centre line to either the surface of the liquid in the discharge tank or to the point of discharge.

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51
Q

What is Total Static Head?

A

The vertical distance from the liquid supply level to the surface of the liquid in the discharge tank or to the point of discharge.

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52
Q

What is Frictional Loss?

A

The pressure needed by the fluid to overcome friction as it moves through the piping, valves and fittings in the system.

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53
Q

What is Velocity Head?

A

The force causing the fluid to flow through a chamber which is due to the velocity of the fluid.

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54
Q

What is Dynamic Suction Lift?

A

This is equivalent to the static suction lift plus the velocity head minus all the frictional losses in the suction pipes and fittings.

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55
Q

What is Dynamic Suction Head?

A

This is equivalent to the static suction head minus the velocity head and all the frictional losses in the suction pipes and fittings.

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56
Q

What is Dynamic Discharge Head?

A

This is the equivalent to the static discharge head plus the velocity head and all the frictional losses in the discharge pipes and fittings.

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57
Q

What is Vapour Binding?

A

When pressure on the suction side of a pump drops below the vapour pressure of the liquid, vapour forms. This can partially of completely stop the flow. This is said to be Vapour Bound.

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58
Q

What is Vapour Binding caused by?

A

Because of insificient suction head, high suction lift, excessive friction head, or high liquid temperature.

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59
Q

What does NPSH stand for?

A

Net Positive Suction Head

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60
Q

What is NPSH?

A

The required pressure at pump suction to prevent Vapour Binding and Cavitation.

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61
Q

What must the pressure be greater than at the pump suction?

A

Vapour Pressure of the pump liquid.

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62
Q

What is a pumps capacity determined by?

A

The volume of liquid delivered per unit of time.

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63
Q

Slip Factor is expressed as what?

A

A percentage.

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64
Q

What is Slip Factor?

A

The difference between the actual volume of liquid discharged by a pump and its theoretical capacity.

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65
Q

How are pumps rated?

A

They are rated according to capacity at a given head and speed.

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66
Q

How is a pump size expressed?

A

By its diameter of discharge nozzle, suction nozzle, and impeller.

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67
Q

Is a Volute Pump a Radial or Axial pump?

A

Radial Pump

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68
Q

What are diffusers?

A

Stationary, curved vanes in the casing which redirect the the flow of liquid. Used to create multiple volutes.

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69
Q

Are there such pumps as Axial Dynamic Pumps?

A

Yes. Axial Flow Pumps

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70
Q

What is a multi-stage pump?

What do they create more of?

A
  • A pump with a series of impellers.
  • Discharge Pressures
71
Q

What kind of pump is a Regenerative Turbine Pump?

A

Dynamic Peripheral Pump

72
Q

How many rows of vanes does a Regenerative Turbine Pump have?

A

2 in a single impeller.

73
Q

Which has a larger discharge pressure? A radial pump or regenerative turbine pump?

A

Regenerative Turbine Pump because of its unique impeller flow.

74
Q

Name all the different types of impellers.

A

Open impeller
Semi-open, single inlet impeller
Closed, single inlet impeller
Closed double-inelt impeller
Screw-style impeller
Axial-flow
Open mixed flow impeller

75
Q

What general type of impeller is this?

A

Open Impeller

76
Q

What general type of impeller is this?

A

Closed Impeller

77
Q

What type of impeller is this?

A

Semi-open impeller

78
Q

How many shrouds does a Semi-open Impeller have?

A
  1. Closed Impeller has two.
79
Q

Which closed pump impeller has axial thrust?

Why?

A

Closed Single-Inlet Impeller. There is only one inlet on one side.

80
Q

What are Screw Style Impellers used with?

A

Suspended solids

81
Q

What is this?

What is this used with?

A

Inlets

Closed Double Inlet Impeller.

82
Q

What are two ways of mounting an Impeller?

A

On the end of a shaft or mid-shaft.

83
Q

At what point does the impeller and casing leakage become too much to be efficitent?

A

When the gap exceeds three times the intial clearance.

84
Q

What are wear rings in a centrifugal pump?

A

Replaceable strips on the end of impellers and on the casing

85
Q

What type of impeller wear ring format is this?

A

Labyrinth

86
Q

What three methods are wear rings held in place?

A

Shrink Fit
Spigot, groove or pins
Screw Threads

87
Q

What devices compensate for Axial Thrust?

A

Balancing Holes
Balancing Drum
Balancing Disk

88
Q

What balancing device is used on single stage pumps?

A

Balancing Holes

89
Q

What is this?

Label it.

A

Balancing Drum

90
Q

What is this?

Label this.

A

Balancing Holes

91
Q

What is this?

Label it.

A

Balancing Disk

92
Q

What is this?

A

Balancing Drum and Disk Combination

93
Q

Where are Compression packing and Mechanical Seals assembled?

A

Into the stuffing box.

94
Q

What is the stuffing box?

A

A recess in the casing around the rotating shaft of the pump.

95
Q

What do compression packing and mechanical seals do?

A

Seal between a moving shaft and casing.

96
Q

Where/when are Mechanical seals used?

A

Used when leakage is unwanted. Or where compression packing will not work.

97
Q

Is compression packing used in high or low pressure conditions?

A

Low pressure conditions

98
Q

What is this?

Label it.

A

Stuffing box with four rings of packing and a lantern ring.

99
Q

What is another name for a Lantern Ring?

A

Seal Cage

100
Q

What does the Lantern Ring do?

A

For negative pressure pumps air can be sucked in. Packing that is lubricated prevents this. The lantern ring provides a path to lubricate the packing.

101
Q

What happens if packing is not lubricated on a negative sealed pump.

A

Aeration. Pump will suck air in.

102
Q

What are wear sleeves made from?

A

Stellite, Stainless Steel, Chrome, Brass and Bronze.

103
Q

What kind of oil feed do Horizontal pumps have for bearings?

A

Drip-feed or endless chain or ring riding

104
Q

What is a negative quality of Base Mounting Pumps?

A

If operation temperature changes the pump can become misaligned.

105
Q

Do Center-line Mounted Pump have alignment issues if the operating temperature changes?

A

No, there is very little effect.

106
Q

What is a Close-coupled Mounted Pump set up?

A

The motors shaft extends through the pump casing.

107
Q

Do centrifugal pumps need to be primed?

A

Yes

108
Q

What is a crutal step before starting a centrifugal pump other then priming?

A

All air from the seal housing is vented.

109
Q

What type of drawing is this?

A

Sectional or Cutaway

110
Q

Where are Positive Displacement Pumps used?

A

Where constant flow or a measured amount of flow is critical.

111
Q

What is the difference between a piston pump and plunger pump?

A
  • Plunger pumps have their plunger sliding inside the packing.
  • Piston pumps have their packing sliding with their piston.
112
Q

What type of pump is this?

A

Single-acting plunger pump

113
Q

Where are Plunger Pumps usually found?

A

Where measured amounts of liquid is to be expelled.

114
Q

How are Plunger Pumps sealed?

A

V, U ring packing

115
Q

How are Piston Pumps sealed?

A

Two Ways:

  • With a series of cast iron rings which are fitted into grooves in the perimeter of the piston
  • With cup or U-ring packing material held in poisiton be retainers
116
Q

What is this?

A

Diaphragm Pump

117
Q

How are the intake valves and out valves operated for reciperating pumps?

A

The valves are check valves and they are operated by difference in pressure.

118
Q

Name four types of check valves.

A

Flap Check Valve
Wing-guided Check Valve
Stem-guided Check Valve
Ball Check Valve

119
Q

What type of check valve is this?

A

Stem-guided Check Valve

120
Q

What type of Check Valve is this?

A

Wing-guided Check Valve

121
Q

What type of check valve is this?

A

Flap Check Valve

122
Q

What are Stem-guided Check Valves used for in recipracating pumps?

A

Low Pressure applications.

123
Q

What are Wing-guided Check Valves used for in reicprocating pumps?

A

Moderate to High Pressure applications.

124
Q

What are Flap Chack Valves used for reciprocating?

A

Low Pressure and Free Flow of Semi-solids.

Primarly found in diaphragm pumps.

125
Q

What are Ball Check Valves used for in reciprocating pumps?

A

Where free opening of suction and discharge is needed.

126
Q

What kinda of delivery do Rotary pumps have when it comes to volume?

A

Can be fixed or variable.

127
Q

For Rotary Pumps which types of pumps are capable of variable delivery?

A

Vane and piston pumps

128
Q

What type of pump is this?

Label it.

A

External Gear Pump

129
Q

What is this?

Label it.

A

Internal Gear Pump

130
Q

Why are Internal Gear Pumps called Internal Gear?

A

Because there is a gear inside which is cut with internal gears.

131
Q

What is this?

Is it balanced or unbalanced?

Label it.

A
  • Sliding Vane Pump
  • Unbalance Type
132
Q

What does balanced and unbalanced mean for vane pumps?

A
  • If the pump is balanced the rotor is in the center of the elliptical case and the pump has two outlets and two inlets to balance forces.
  • Unbalanced mean the pump is offset in the elliptical case and force builds on one side of the rotor.
133
Q

What is this?

Label it.

A

Balanced Vane Pump

134
Q

What kind of pump is this?

A

Variable Vane Pump

135
Q

What is able to be moved in a Variable Vane Pump?

A

Pressure-Chamber Ring

136
Q

What is this?

Label it.

A

External Vane Pump

137
Q

How many Sliding Vanes does an External Vane Pump have?

A

One Sliding Vane

138
Q

What shape of Rotor does an External Vane Pump have?

A

Oval

139
Q

What is another name for Peristaltic Pumps?

A

Flexible Tube Pumps

140
Q

Where are Flexible Tube Pumps used?

What kind pressure and rpm can it handle.

A
  • In proccess’s requiring measured flow for slurry, sludge, pulp and unusual material.
  • Low. 200 rpm and 100 psi
141
Q

What is this?

A

Flexible Tube Pump

142
Q

What is this?

What kind of Rotor does this use?

What shape is the Rotor?

A
  • Flexible Liner Pump
  • Eccentric
  • Circle
143
Q

What is this?

A

Flexible Vane Pump

144
Q

Name 3 type of Flexible Pumps

A

Flexible Vane Pump
Flexible Tube Pump
Flexible Liner Pump

145
Q

What compresses the fluid in a Flexible Vane Pump?

A

The insert which takes up space.

146
Q

What rpm does the Flexible Vane Pump run at?

A

Moderate (6000 rpm)

147
Q

What synchronizes the lobes in a Lobe Pump?

A

The external timing gears.

148
Q

What type of Lobe is this?

A

Single Lobe

149
Q

What is a stator?

A

The stationary lobed casing which meshes with a screw in a screw pump.

150
Q

What is another name for a Single Screw Pump?

A

Progressive Cavity Pump

151
Q

What is this?

Label it.

A

Single Screw Pump

152
Q

What is this?

A

A Three-lobe Pump

153
Q

What is this?

Label it.

A

Axial Piston Pump

154
Q

What is this?

A

Radial Piston Pump

155
Q

Is the shaft of a Radial Piston Pump Eccentric or Ellipical?

A

Eccentric

156
Q
  • How are Positive Displacement Pumps capcities regulated usually?
  • Do pressure variations affect output?
A
  • By varying speed.
  • Only slightly
157
Q

Without a Pressure Relief Valve what could happen to the positive displacement pump?

A

Line could get blocked causing pump to break or motor stall out

158
Q

What does Bidirectional mean for pumps?

A

They can moving in both directions.

159
Q

What is an important check to ensure the hydraulic system is running to design.

A

Running speed of pump.

160
Q

A varibale displacement pump does not require a seperate relief valve becuase the pump can what?

A

Shift to a no flow position.

161
Q

Answer.

A

B) Impeller Eye blocked

162
Q

Answer.

A

C)

163
Q

Answer.

A

D)

164
Q

Answer.

A

D)

165
Q

Answer.

A

A)

166
Q

Answer

A

D)

167
Q

Answer

A

D)

168
Q

Answer

A

B)

169
Q

Answer

A

A)

170
Q

Answer

A

A)

171
Q

Answer

A

C)

172
Q

Answer

A

C)

173
Q

Answer

A

A)

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