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One Pipe Operation
NOTE: For one-pipe operation (no return line) use the following line length equations
3/8” line: L=(6-.75H)/.0086Q
1/2” line: L=(6-.75H)/.00238Q
NOTE: If tank is above the pump, change the “-“ to a “+”
Sample Calculation for one pipe operation
If the fuel tank is installed below the ground and it is found that the distance from the bottom of the tank to the centerline
of fuel pump is H=7 ft, ½ inch copper tubing is being installed, and the oil pump max flow rate is rated at 3 gal/hr
according to the label, (Q=3 gal/hr), the maximum total line length (L) would be
L=(6-.75*(7))/.00238*(3)
L≈105 ft.
Now to calculate the maximum horizontal distance from the burner pump to the tank (R)
R= L-H,
R=105-7; R=98 ft.
Note: If (6-.75H)=0 or a negative number, based off H≥8 it means that the pump will not be able to pull fuel from the
tank for that given lift (H), either run a return line or use a two-stage pump to overcome this issue.
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