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Pumps

Terms in this set (43)

The Specific Gravity of water is
1
how many feet of head of fresh water produces a pressure of 1 PSI
2.31
Which pump is not dynamic
Reciprocating
Absolute pressure
Gauge pressure plus atmospheric pressure
As pressure is reduced, what happens to the boiling point
it decreases
What can occur if when a liquid vaporizes in a closed system
Cavitation
Suction head
When the pump inlet is below the level of the liquid
What source of energy is available to allow liquid to enter a pump with suction lift
Atmospheric pressure
What is the component that converts mechanical energy to kinetic energy
The impeller
the NPSHR has to what
Less than the NPSHA
A pump converts mechanical pressure to what
Hydraulic energy
Unless stated otherwise, the pump performance curves are based on handling what
Cold water
Friction loss in piping is dependent on what
1. Type of pipe
2. length of pipe
3. diameter of pipe
4. Type of fluid flowing through the pipe
The flow produced by a pump is directly connected to what
The impeller diameter
the head produced by a pump varies with what
the square of the impeller diameter
Th stripper in a regenerative turbine pump is located between what
The suction and discharge
Why do double acting piston pumps not discharge and equal amount of liquid on all strokes
Because of the piston rod decreasing the area of the piston
Which type of reciprocating pump can be run dry
Diaphragm pump
Which pump provides a smoother flow, reciprocating or rotary pump
Rotary
What vein pump uses an oval rotor
External vane pump
What are the two types of variable discharge rotary pumps
Vein and piston
I'm balanced vein pump uses what
An elliptical house
What is a duplex pump
Has two cylinders in to plungers
Is a single cylinder, and double acting plunger pump also known as a duplex pump
No
Plunger pumps can have what kind of strokes
Fixed or adjustable strokes
Hydraulically activate the dive diaphragm pump's have what 3 things
1. Can handle high pressures
2. have high pressure stiffness
3. have high metering precision
Which of the following methods of drive or activation is most likely to be used on the double acting Diaphragm pump
Pneumatically activated
Why is the plunger delivering liquid at different times on a multiplex plunger pump
The stroke on each plunger is different to even out delivery and Paul station
What is the pump that is least likely to be used to handling food products
An external vane pump
And example of a Peristaltic pump would be
A flexible tube pump
Does a flexible vein pump need a relief valve
No
Which type of rotary pump best tolerates abrasives
I single rotor screw pump
Do the rotors of a multiple rotor screw pump all have threads of the same hand, and why
No, they need to mash and create flow as the root turns
Which rotary pump requires timing years
External circumferential piston pump
Which type of pump has a divider between the discharge and inlet ports
Flexible liner pump
Which type of screw pump has a peristaltic action
Single rotor
Which type of check valve would not be suitable for high pressures
Flap
Which type of check for would be least suitable for liquid containing solids
Wing-guided disc
When a relief valve on a rotary pump opens, what happened to the product
It is returns to suction
Relief valves can be white three types
1. Balls
2. Poppets
3. Disc
Why are foot valves not necessary when handling viscous liquids
They may cause too much restriction
What is the preferable gas to be used in Pre-charging a diaphragm type pulsation dampener for unspecified use in an oil refinery
Nitrogen
Where can Pulsation dampeners be installed
in either the suction or discharge lines
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