Specifications

34
TABLE 3: TWO-STAGE UNITS (3450 RPM) -
TWO PIPE SYSTEMS
TABLE 4: SINGLE-STAGE UNITS (3450 RPM) -
TWO PIPE SYSTEMS
Figure 22: 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
3 (two-stage) and Table 4 (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.
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'2'58'001
'4'77'001
'6'96'001
'8'06'001
'01'25'001
'21'44'001
'41'63'001
'61'72'001
'81---'67
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'1'87'001
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'4'36'001
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'7'74'001
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'21'12'38
'31---'26
'41---'14
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.