Module B Flashcards
Which reciprocating pump can be allowed to run dry?
Diaphragm pump
Rotary pumps produce a ____________ than reciprocating pumps
Smoother flow
Which vane pump uses an oval rotor?
External Vane pump
Variable discharge rotary pumps may be _________ and _________
Vanes and pistons
What type of housing does a balanced vane pump use?
An elliptical housing
A duplex pump has two __________ and two __________
cylinders and plungers
Plunger pumps can have fixed or adjustable ________
strokes
What are three properties of hydraulically-activated diaphragm pumps?
- Can handle high pressures
- have high-pressure stiffness
- have high-metering precision
______________ is the type of activation most likely to be used on a double-acting diaphragm pump.
pneumatically-activated
Why is each stroke on a multiplex plunger pump different?
To even out delivery and pulsations
Which pump is least likely to be used for handling food products?
An external vane pump
A flexible tube pump is an example of a _______________ pump
Peristaltic
_________________is an example of a peristaltic pump
A flexible tube pump
A ________ vane pump does not need a relief valve.
flexible
Which type of rotary pump best tolerates abrasives?
single rotor screw pump
The rotors of multi-rotor screw pumps have thread that _______
Are not all the same hand. They need to mesh and creat flow as the rotos turn.
An external circumferential piston pump requires _________ gears.
timing
A flexible liner pump has a divider between the ________ and _______ ports.
discharge and inlet
Which type of screw pump has a peristaltic action?
single rotor
A ________ check valve would not be suitable for high pressures.
flap
A ________ check valve would be the least suitable for liquids containing solids.
Wing guided disc
What happens to the product when a relief valve on a rotary pump opens?
It is returned to suction
What are the three types of relief valves?
Balls, poppets and discs
Are foot valves necessary when handling viscous liquids?
No, they cause too much restriction
Which gas should be used in pre-charging a diaphragm-type pulsation dampener for unspecified use in an oil refinery?
Nitrogen
