Fuel Units & Oil Valves

Question 1

What is the function of a fuel unit?

Answer 1

• Lift Oil from tank to burner
• Deliver oil at a constant regulated pressure
• Provide clean cutoff fuel

Question 2

What parts does a fuel pump consists of?

Answer 2

• Set of machined gears
• Pressure Regulating Valve
• strainer screen
• solid shaft
• shaft seal

Question 3

What are the machined gears on a pump for?

Answer 3

Provide both vacuum and pressure.

Question 4

What does a pressure regulating valve do in a pump?

Answer 4

Controls pressure of oil discharged to nozzle

Question 5

What does the strainer screen do on a pump?

Answer 5

Filters incoming oil and prevents any contamination to the nozzle.

Question 6

How does a single stage pump operate?

Answer 6

Pressure is created by meshing pump gears and is expressed in PSI. Pressure moves oil away from the pump.

Vacuum is expressed in inches of mercury. Hg. Brings oil to pump

Question 7

What is the minimum factory setting for operating pressure of a pump?

Answer 7

100 PSI

Question 8

How much oil can a pump deliver to the nozzle?

Answer 8

5-20 times the oil required by the nozzle.

Question 9

How much pressure can a pump seal withstand?

Answer 9

10 PSI

Question 10

When is bypass plug installed?

Answer 10

Only when using a two pipe system.

Question 11

How is acceptable vacuum calculated?

Answer 11

1" Hg per foot of lift
\+ 
1" per ten feet horizontal run
\+ 
1" per for oil filter

Question 12

What happens to a pump in burner shutdown?

Answer 12

-Spring tension against pressure regulating piston will close.Shutting off oil to nozzle at a pressure 20%below operating pressure.

Question 13

At what vacuum does a one pipe system operate?

Answer 13

6” Hg

Question 14

When is a two pipe system used?

Answer 14

If more the 6” Hg is required.

Question 15

When should a two stage pump and two pipe system be installed?

Answer 15

If more then 10”Hg of vacuum is required.

Question 16

How is a two stage pump used?

Answer 16

Has two sets of gears,the first set purges the pump of air and supplies uninterrupted flow of oil to the second stage that pressurizes the oil to the nozzle.

Question 17

Why do we need two stage pumps?

Answer 17

Because single stage is capable of 20”Hg but fuel oil starts to vaporize at vacuum as low as 6.7”Hg.

Question 18

What is cavitation?

Answer 18

Boiling oil. Looks foamy.

Question 19

Ina two pipe/ two stage system what is the recommended intake vacuum not to exceed?

Answer 19

17”Hg

Question 20

What is a booster fuel unit?

Answer 20

Assure adaquate supply of oil to one or more overhead furnaces.capable of lifting oil 15FT and supplying the oil up to 35 FT above the pump. Boosters are a fuel pump and motor.

Question 21

What are some fuel unit limitations?

Answer 21

• shaft seal pressure to 3PSI
• single stage not operated beyond 6”Hg when on one pipe system. Single stage two pipe 10”Hg
• two stage pumps 12”Hg

Question 22

What are the shaft rotations on a pump?

Answer 22

CW: clockwise to the right

CCW: counterclockwise left

Rotation must be matched to burner motor.

Question 23

What is a solinoid oil valve?

Answer 23

Once burner is up to speed it allows oil to flow and once air flows into heat exchanger.

Question 24

What is an oil safety valve?

Answer 24

Will break siphon should an oil line leak develops.

Question 25

A firomatic melts at what temp?

Answer 25

165