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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.
Figure 17: Two-Pipe Installation
21
TABLE 3: TWO-STAGE UNITS (3450 RPM)
TWO-PIPE SYTEMS
Maximum Length of Tubing
"H" + "R" (See Figure)
Lift "H"
(See Fig. )
3/8" OD
Tubing (3 GPH)
0'
93'
2'
85'
4'
77'
6'
69'
8'
60'
10'
52'
12'
44'
14'
36'
16'
27'
18'
---
1/2" OD
Tubing (3 GPH)
100'
100'
100'
100'
100'
100'
100'
100'
100'
76'
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