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[Pumps designed for oil lubrication shall have a shaft seal system located
below upper pump shaft bearing. Seal system shall consist of a seal
containing two lip elements. Element facing bearing shall have a stainless
steel garter spring back-up and be constructed of TFE (Teflon). Secondary
element shall face impeller and be constructed of TFE. Use bullet-shaped
assembly tool or other special tool over end of shaft or grooves in shaft
to preclude damage to lip element during assembly. Assembly tools used are
considered a special tool and shall be furnished to Government as part of
special tools specified in paragraph MAINTENANCE, subparagraph SPECIAL
TOOLS. Pumps having two stages shall have seals to protect extra bearings
required by two stages of construction.]
[Pumps designed for grease lubrication shall have a shaft seal consisting
of lip seals. Seal system shall consist of a lip-type seal located on each
end of bearing. Each seal shall contain a lip element having a stainless
steel garter spring back-up and be constructed of TFE (Teflon). Lip
element shall face bearing. Lowest bearing shall have an additional grease
seat with lip facing away from bearing. Use bullet-shaped assembly tool or
other special tools over the end of shaft and shaft grooves to preclude
damage to lip element during assembly. Assembly tool used is considered a
special tool and shall be furnished to Government as part of special tools
specified in paragraph MAINTENANCE, subparagraph SPECIAL TOOLS.]
2.2.13
Bearing Heat Sensors
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NOTE: Bearing heat sensors may be used in pumps
having a discharge diameter large than 600 mm (24
in.). Pumps with large discharge diameters should
be furnished with heat sensors for the impeller
bearings only, when the estimated annual operation
is less than 100 hours per pump. Pumps with greater
operating hours per year may be equipped with
bearing heat sensors for all bearings in the pump.
Schedule 80 guard pipes shall be used when the
unsupported length is 450 mm (18 in.) or less.
Schedule 120 should be used for greater unsupported
lengths.
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Fit [impeller shaft bearings][each bearing] with temperature-sensing
elements, inserted in bearings to within 3 mm 1/8 inch of shaft. These
temperature-sensing elements shall be provided with temperature readouts
mounted [on [engine][motor] instrument board][at a central location as
shown]. Provide visual and audible alarm system to warn of bearing
overheating. Support leads and protect from water and mechanical damage.
Terminate leads outside of pump casing in a waterproof connection head,
Minco CH 339 or equal, and cap until final connections are made in the
field. The connection head shall be rated watertight to 175 kPa (25 psi).
Lead protection shall consist of pipes fastened to pump with brackets using
bolts and nuts to permit their removal, and shall be constructed with
enough unions to be completely disassembled. Leads passing through pump
water passage in pump shall either be contained in a guide vane or be
protected by [Schedule 80][Schedule 120] pipe. Protection pipe shall be
removable if connected to shaft-enclosing tube. Install bearing heat
sensors as shown in Figure 2 at end of the section. Run leads and wiring
to a junction box located on baseplate. Provide terminal strip in junction
SECTION 15131A
Page 35
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