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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
5 (two-stage) and Table 6 (single-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 22.
2. Follow the oil pump manufacturer's recommenda-
tions on the proper connections for a two pipe
system. Some manufacturers require the insertion
of a bypass plug.
TABLE 5: TWO-STAGE UNITS (3450 RPM) -
TWO PIPE SySTEMS
Maximum Length of Tubing
"H" + "R" (See Figure 22)
Lift "H"
(See Fig. 22)
3/8" OD Tubing
(3 GPH)
0'
2'
4'
6'
8'
10'
12'
14'
16'
18'
4
1/2" OD Tubing
(3 GPH)
93'
100'
85'
100'
77'
100'
69'
100'
60'
100'
52'
100'
44'
100'
36'
100'
27'
100'
---
76'
Figure : Two Pipe Oil Lines
3. Under no circumstances is a manual shutoff valve to
be located on the return line of a two pipe system.
Accidental closure of the return line will rupture the
oil pump seals.
TABLE 6: SINGLE-STAGE UNITS (3450 RPM) -
TWO PIPE SySTEMS
Maximum Length of Tubing
"H" + "R" (See Figure 22)
Lift "H"
(See Fig. 21)
3/8" OD Tubing
(3 GPH)
0'
1'
2'
3'
4'
5'
6'
7'
8'
9'
10'
11'
12'
13'
14'
1/2" OD Tubing
(3 GPH)
84'
100'
78'
100'
73'
100'
68'
100'
63'
100'
57'
100'
52'
100'
47'
100'
42'
100'
36'
100'
31'
100'
26'
100'
21'
83'
---
62'
---
41'
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