Chapter 12 Pump Design And Operation Flashcards
The Plunger, Piston and Diaphragm pumps are classified as:
A) Dynamic Pumps
B) Reciprocating Positive Displacement pumps
C) None return pumps
D) Axial Pumps
B
The main difference between a plunger and piston pump is:
A) The piston is classified as a dynamic pump
B) The plunger doesn’t require valves
C) The suction valve for a plunger sits on top of the fluid head
D) The plunger has no piston head
E) The piston is single acting only
D
For a reciprocating type of pump, pump capacity means:
A) The adjustable stroke for volume control
B) The volume of fluid delivered per stroke in a given time
C) The volume delivered with a double acting piston pump
D) The volume of fluid the pump can hold and contain
B
The above diagram is the fluid end of a double acting reciprocating pump, the piston moves from right to left. Liquid is then drawn in through the suction valves and at the same time discharged through the outlet valves. From the following list identify which 2 valves are in the open position and which two valves are in the closed position.
A) B & D are open, A & C are closed
B) A & D are open, B & C are closed
C) B & C are open, A & D are closed
D) A & C are open, B & D are closed
C
Pump wear rings are installed on an impeller by:
A) Key Seats
B) Welding
C) Set screws, threads or shrinking
D) Jam Nuts
C
The purpose of shaft sealing on a pump is to:
A) Keep air in the pump
B) Keep the packing gland cool
C) Stop fluids from leaking out along the shaft of the pump
D) Eliminate the need for a relief valve
C
The packing is held into place along the pump shaft by a:
A) Stuffing box
B) Lantern Ring
C) Casing wear ring nut
D) Gland and Gland Nut
D
New packing should be installed:
A) Loose enough to allow a small amount leakage for lubrication and cooling
B) Every shut down
C) Every time prior to shut down
D) Every year
A
Lantern rings:
A) Are fed by a liquid
B) Are mostly used on high lift pumps
C) Provide a seal to prevent air from entering the pump casing
D) All of the above
D
Overtightening the packing may cause:
A) None of the above
B) Scoring of the pump shaft
C) Less leakage
D) Impossible as a spring in the stuffing box prevents overtightening
B
One major advantage of a Rotary pumps is:
A) They can handle viscous fluids
B) Their impellers can be changed quickly
C) They are dynamic
D) They are quite
A
One advantage of a triplex pump is:
A) They can be designed double acting and pump more liquid per stroke
B) The pistons require less maintenance
C) It offers a smother discharge flow
D) The suction valves are on the top of the fluid end
C
The above figure is what type of pump?
A) Volute Centrifugal Pump
B) Diffuser Centrifugal Pump
C) Vertical Axial Flow Pump
D) Centrifugal Diffuser Pump
B
Before the pump is put into operation, the stuffing boxes require inspection. If the liquid to be pumped is dirty or corrosive, the stuffing boxes need to be sealed with:
A) A clean sealing liquid from another source
B) A neoprene gasket of appropriate size
C) Grease packing
D) A caulking compound as recommended by the manufacturer
A
The type of pump that, under no circumstances, is to be started unless the casing and suction are filled with liquid is a:
A) Centrifugal pump
B) Reciprocating pump
C) Regenerative pump
D) Rotary pump
A
