Roatary Vane Pump

Question 1

Purpose of rotary vane pump

Answer 1

It’s a positive displacement pump for pumping all kinds of fluids on ships.
-also used for gasoline or low viscosity fluids where a high suction lift is required

Question 2

What pumps are rotary vane pumps

Answer 2

Transfer pump
Stripping pump
Defuel pump
Auxiliary pump

Question 3

Transfer pump does what

Answer 3

Stowage to stowage tanks ..

Stowage to service tanks via purifier

Question 4

Stripping pump does what

Answer 4

Removes sludge and water that settle at bottom of tank .

• 2 pumps installed in both forward and aft systems
• 1 in cargo

Question 5

Defuel pump does what

Answer 5

Used to return aircraft defueling or refueling or hose flushing fuel back to stowage tanks.
- one pump installed per fuel station

Question 6

Auxiliary pump used for what

Answer 6

Transfers fuel form service tanks to EDGs, small boat stations , and tractor filling stations

Question 7

Components and functions of rotary vane pumps

Answer 7

4 components

• cylinder body
• head assemblies
• rotor and shaft assembly
• pressure control valve

Question 8

Cylinder

Answer 8

Houses the rotor assembly and pressure control valve

• has openings for suction and discharge piping connections
• machines to form an oval shaped cylinder bore

Question 9

Head assemblies

Answer 9

• acts as end covers for cylinder bore enclosure

- houses the ball bearings and mechanical seal assembly

Question 10

Ball bearings

Answer 10

Located in bearing housing within cylinder head

• supports the rotor and shaft assembly
• maintains clearance between outside diameter of the rotor and cylinder bore
• bearing covers are equipped with grease fitting

Question 11

Mechanical seal

Answer 11

• prevents leakage of fuel align the shaft and into the bearing housing
• 2 seals installed on each end of shaft
• an O ring acts as a seal between the heads and the cylinder

Question 12

Rotor and shaft assembly

Answer 12

• rotates within the cylinder to move JP5 from the suction flange to the discharge flange
• it contains recesses which houses 6 vanes and 3 pushrods. They made of polymite
• vanes have relief grooves , which face direction of rotation. And it allows JP5 behind vane to escape and be directed to the discharge

Question 13

Vanes

Answer 13

Maintain sliding contact with cylinder bore by pushrods and centrifugal force

Question 14

Pushrods

Answer 14

They slide back and forth through the holes in shaft and rotor. They make contact with vanes at each end

Question 15

Why is the rotor keyed to shaft

Answer 15

To ensure rotation with the shaft

Question 16

Why is the rotor pinned to the shaft

Answer 16

To prevent axial movement

Question 17

The shaft applies drive rotation to?

Answer 17

The rotor

Question 18

Shaft is connected to the drive motor through?

Answer 18

A flexible coupling and gear reduced

Question 19

Pressure control valve assembly

Answer 19

• prevents build up of excessive pressure in pump

Question 20

Pressure control valve assembly consist of what

Answer 20

• Pressure control valve
• Pressure control spring
• an adjusting screw mounted in the pressure control body

Question 21

Pressure control valve is set how ?

Answer 21

By adjusting the pressure control spring tension with the adjusting screw

Question 22

Pressure control valve body provides what?

Answer 22

A passage from the discharge side of pump to suction side

Question 23

Gear reducer

Answer 23

It reduces motor speed to the required output pump speed through mechanical gear reduction .
- ratio from motor to pump is 3:1

Question 24

Flexible coupling

Answer 24

It connects the pump shaft to the motor shaft

Question 25

A minimum amount of misalignment is permitted between what?

Answer 25

The two shafts

Question 26

Flexibility of the coupling is normally provided from what ?

Answer 26

• gear
• chain
• spring
• rubber insert between the coupling halves

Question 27

A drive motor turns the rotor and shaft assembly through what?

Answer 27

Gear reducer

Question 28

The sliding vanes are put in contact with the cylinder by what?

Answer 28

Centrifugal force and pushrods

Question 29

The passage of the vanes into the lower portion of the cylinder bore builds what?

Answer 29

High pressure, forcing fuel out of pump.

Question 30

The pressure control valve maintains what?

Answer 30

The desired or set pressure being discharged from the pump

- set at 62 psi

Question 31

How many vanes and pushrods On a rotary vane pump? What are they made of

Answer 31

• 6 vanes
• 3 pushrods
• vanes made of palamite