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106346-06 - 8/19
FORCE
Installation, Operating & Service Manual
Table 7: Two-Stage Units (3450 RPM) -
Two Pipe Systems
Table 8: Single-Stage Units (3450 RPM) -
Two Pipe Systems
Figure 31: Two Pipe Oil Lines
C .
TWO PIPE OIL LINES
1. For two piped systems, where more lift
is required, the two-stage fuel unit is
recommended. Table 7 (two-stage) and Table
8 (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 31.
2. Follow the oil pump manufacturer’s
recommendations on the proper connections
for a two pipe system. Some manufacturers
require the insertion of a bypass plug.
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.
Lift "H"
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'
69'
100'
10
52'
100'
12'
44'
100'
14'
36'
100'
16'
27'
100'
18'
---
76'
Lift "H"
Maximum Length of Tubing
"H" + "R" (See Figure)
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'
76'
11'
26'
100'
12'
21'
83'
13'
---
62'
14'
---
41'
9
Oil Piping
(continued)
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