Service Pump

Question 1

What kind of pump is a service pump?

Answer 1

A centrifugal service pump.

- aurora service type of pump

Question 2

What are 2 types of centrifugal service pumps?

Answer 2

• Buffalo

- Aurora

Question 3

What kind of service pump on TR JP5 system?

Answer 3

Aurora service pump

Question 4

The Aurora service pump is a what type of pump?

Answer 4

Double suction, single discharge , centrifugal pump

Question 5

Specs do the service pump ?

Answer 5

1100 GPM @ 150psi with a 20 ft. Suction lift

Question 6

What does the service pump consist of ?

Answer 6

• split casing
• wearing rings
• rotating element

Question 7

Split casing

Answer 7

Casing is horizontally split at the shaft centerline .

- this enables removal of the upper casing half for inspection and maintenance

Question 8

Split casing is divided into how many chambers ?

Answer 8

3 chambers.

- 2 suction and 1 discharge

Question 9

How many casings?

Answer 9

• upper half

- lower half

Question 10

Upper half contains what?

Answer 10

Contains a flange that may connect pump to an air eliminator valve.

Question 11

How many external seal lines on the upper half casing ?

Answer 11

2 external seal lines

Question 12

What do the external seal line on the upper half casing do?

Answer 12

Feeds fuel from the discharge chamber to cool the mechanical seals

Question 13

Lower half casing contains what?

Answer 13

• bearing housing
• suction flange
• discharge flange
• flanges connect pump to the piping system

Question 14

Drain holes and drain plugs are provided at bottom of both flanges for what?

Answer 14

Draining pump

Question 15

Centrifugal pumps can be modified to handle fuels at what temperatures?

Answer 15

At all normal temperatures

Question 16

Wearing rings

Answer 16

There are four replaceable type of wearing rings installed within pump casing.

(2) rotating
(2) stationary

Question 17

Where are the rotating wearing rings located ?

Answer 17

On the impeller

Question 18

Where are the stationary wearing rings located ?

Answer 18

Installed within the pump casing between the suction and discharge chambers

Question 19

Stationary wearing rings are held in place and prevented from rotating how?

Answer 19

By the tongue and groove construction

Question 20

When pump is assembled the rotating rings ride where?

Answer 20

Inside the stationary rings

Question 21

Wearing rings serve 2 purposes ?

Answer 21

1. Owing to their unique construction and close tolerances, they minimize leakage between suction and discharge chambers
2. They allow for the wear created between the impeller and Pump casing .

Question 22

What happens As fuel passes through the narrow clearances between the wearing rings?

Answer 22

A rapid seal is made by the rapid rotation of the impeller.

Question 23

After prolonged use of the pump what happens to the wearing rings?

Answer 23

The clearance gradually increases due to wear , sealing effect decreases resulting loss of rated capacity of pump.

Question 24

Rotating element on service pump consist of

Answer 24

• impeller and pump shaft
• mechanical seals
• bearing cartridges
• falk type - F steel coupling
• magnetic coupling
• Alternate current(AC) magnetic motor controller

Question 25

Impeller and pump shaft

Answer 25

It is a double - suction , closed impeller. It is keyed and rotates with the pump shaft.

Question 26

Mechanical seals

Answer 26

They are fitted on the pump shaft protect against fuel leakage from the pump and prevent air from entering the casing around shaft.

Question 27

2 types of mechanical seals

Answer 27

John crane- single piece unit
Durametallic - 3 piece unit
* must be handled carefully due to some parts being made of carbon

Question 28

Bearing cartridge

Answer 28

Pump shaft ends are supported by ball bearings encased in bearing cartridges and cradled in the bearing brackets of the lower half casing.

Question 29

Ball bearings

Answer 29

Absorb radial and axial thrust , and ensure free rotation of the shaft

Question 30

Single ball bearing

Answer 30

Housed in the inboard bearing cartridge,allowing inboard bearing some axial movement within the bearing cartridge

Question 31

Dual ball bearings

Answer 31

Housed in the outboard bearing cartridge

Question 32

Bearing covers

Answer 32

Prevent bearing grease to leak out of the bearing cartridge.
- also prevent dirt , water , or fuel form entering bearing cartridge

Question 33

Flexible coupling

Answer 33

Designed to absorb vibration due to misalignment between motor shaft and the pump shaft

Question 34

Coupling hubs

Answer 34

Keyed to both the pump and the motor shafts.. and are lubricated to reduce wear and tear in coupling

Question 35

Falk type-F steel flex coupling

Answer 35

Flexible , self aligning , grid member coupling.

Question 36

Magnetic coupling

Answer 36

Used between the pump and the motor.

It consist of a conductor housing and magnetic rotor .

Question 37

The magnetic attraction between conductor housing and magnetic rotor is translated into rotational torque causing?

Answer 37

The pump shaft to rotate . Lubrication of this coupling is NOT required. And NEVER remove perimeter bolts

Question 38

AC magnetic controller

Answer 38

Used to control power to the ac motor .
A spring - return start/stop switch and a reset push button are mounted on controller. Also can be stopped by an emergency shutdown switch inside pump room