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L. 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 13.
Figure 13: Two-Pipe Installation
TABLE 2: SINGLE STAGE UNITS (3450 RPM)
TWO PIPE SYSTEMS
Lift "H"
(See Figure)
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' 100'
11' 26' 100'
12' 21' 83'
13' --- 62'
14' --- 41'
TABLE 3: TWO-STAGE UNITS (3450 RPM)
TWO-PIPE SYSTEMS
Lift "H"
(See Figure)
Maximum Length of Tubing
"H" + "R" (See Figure)
3/8" OD
Tubing
1/2" OD
Tubing
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'