Burnham MST396 User Manual
Page 38
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TABLE 5: TWO-STAGE UNITS (3450 RPM) -
TWO PIPE SySTEMS
TABLE 6: SINGLE-STAGE UNITS (3450 RPM) -
TWO PIPE SySTEMS
Figure : 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
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.
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"
(See Fig. 22)
Maximum Length of Tubing
"H" + "R" (See Figure 22)
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'
Lift "H"
(See Fig. 21)
Maximum Length of Tubing
"H" + "R" (See Figure 22)
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'