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|  MIL-P-17639F(SH)
3.2.12 Welding and brazing. Welding shall be in accordance with
The use of silver brazed joints is prohibited for any joint which
MIL-STD-278.
could be heated by future weld repair of the casing. Where silver joints are
not prohibited, such joints shall be in accordance with NAVSEA 0900-LP-001-7000.
The use of silver-brazed joints is prohibited in the fluid boundary for sea water
pumps for submarine applications.
3.2.13 Turbines.
3.2.13.1 Turbines for driving pumps shall be in accordance with MIL-T-17523
and as specified (see 6.2.1).
3.2.14 Motors.
3.2.14.1 Unless otherwise specified (see 6.2.1), motors for driving pumps
shall have sealed insulation, service A with the characteristics specified in
the contract or order, and shall conform to MIL-M-17413 for direct current (de)
motors and to MIL-M-17060 for alternating current (at) motors. For surface
ships applications, the motors shall be totally enclosed fan cooled. For
submarines , see 6.2.1 for complete motor specification.
3.2. 14.2 Motor rotors for use on dual turbine and motor-driven pumps
shall be designed and tested for a speed of 25 percent in excess of rated
turbine speed.
3.2.14.3 The horsepower (hp) rating of each motor shall be equivalent to
at least the maximum brake horsepower (bhp) of the driven pump under any con-
dition from shut-off to free delivery. Head capacity and bhp curve shall
demonstrate that motor is non-overloading at any point. The actual motor rating
shall be in accordance with the Navy standard motor ratings as indicated in the
applicable motor specification (see 3.2.14.1). If the maximum bhp of the pump
is less than 2, and if there is a possibility of an unpredictable high frictional
load due to improper adjustment of the gland or to some other cause, then the
maximum bhp shall be multiplied by a safety factor of 1.5 minus (max. bhp) before
selecting the next larger Navy standard rating.
4
3.2.14.4 Motor insulation shall be in accordance with MIL-E-917 and shall
be class B or F as specified (see 6.2.1). Regardless of class of insulation
used , motor temperature rise at rated full motor load shall not exceed 70 degrees
Celsius ("C) in
ambient as specified for class B insulation in MIL-M-17060.
3.2.15 Controllers. Motor controllers shall be in accordance with
MIL-C-2212 for ac and dc and shall have the characteristics as specified
(see 6.2.1).
3.2.16 Painting. External unmachined surfaces of ungalvanized ferrous
metal parts shall be thoroughly cleaned and coated with one coat of pretreatment
conforming to DOD-P-15328, and one coat of zinc chromate primer conforming to
TT-P-645 followed by a finish coat of light gray equipment enamel conforming
to MIL-E-15090.
3.2.16.1 Painting of external surfaces of nonferrous parts of pumps will
not be required.
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