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C. Two-Pipe Oil Lines
1. For two-piped systems, where more lift is required,
the two-stage fuel unit is recommended. Table
2 (single-stage) and Table 3 (two-stage) show
allowable lift and lengths of 3/8 inch and 1/2 inch
OD tubing for both suction and return lines. Refer
to Figure 21.
Figure 21: Two-Pipe Installation
Lift "H"
(See Figure 21)
Maximum Length of Tubing
"H" + "R" (See Figure 21)
3/8" OD Tubing
(3 GPH)
1/2" OD Tubing
(3 GPH)
0' 84' 100'
1' 78' 100'
2' 73' 100'
3' 68' 100'
4' 63' 100'
5' 57' 100'
6' 52' 100'
7' 47' 100'
8' 42' 100'
9' 36' 100'
10' 31' 100'
11' 26' 100'
12' 21' 83'
13' --- 62'
14' --- 41'
Lift "H"
(See Figure 21)
Maximum Length of Tubing
"H" + "R" (See Figure 21)
3/8" OD Tubing
(3 GPH)
1/2" OD Tubing
(3 GPH)
0' 93' 100'
2' 85' 100'
4' 77' 100'
6' 69' 100'
8' 60' 100'
10' 52' 100'
12' 44' 100'
14' 36' 100'
16' 27' 100'
18' --- 76'
Table 3: Two-Stage Units (3450 RPM) -
Two Pipe Systems
Table 2: Single-Stage Units (3450 RPM) -
Two Pipe Systems