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C. Two-Pipe Oil Lines.
1. For two-pipe 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 ½-inch
OD tubing for both suction and return lines. Refer
to Figure 17.
TABLE 3: TWO-STAGE UNITS (3450 RPM)
TWO-PIPE SYTEMS
Lift "H"
(See Fig. )
Maximum Length of Tubing
"H" + "R" (See Figure)
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'
Figure 17: Two-Pipe Installation