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|  MIL-P-18682D(SH)
3.2.21 Provision for handling. Eyebolts, lugs, holes, and other means
shall be provided to permit attachment of lifting gear for lifting the assembled
pump, driver, and attached accessories as a complete unit. Means shall be
provided for the handling of parts and components weighing 150 pounds and over
which cannot be handled manually during unit overhauls and preventive maintenance
inspections.
3.3 Detail requirements.
3.3.1 Unless otherwise specified (see 6.2.1), horizontal main circulating
pumps shall be flexible coupled, and vertical main circulating pumps shall be
rigid coupled.
3.3.2 Performance characteristics.
3.3.2.1 The performance characteristics of the pump shall be as specified
(see 6.2.1).
3.3.2.2 Main circulating pump suction conditions shall be as specified in
6.2.1(d)(6).
3.3.2.3 Unless otherwise specified (see 6.2.1), pumps for surface ships
shall be provided with bilge connections, which shall be capable of pumping
bilges at a dynamic suction lift of 15 feet of water.
3.3.2.4 Unless otherwise specified (see 6.2.1), pumps for submarines shall
not have a bilge connection.
3.3.3 Casings.
3.3.3.1 The pump casing shall be split to facilitate the ready removal and
replacement of pump shaft, internal pump bearings, and impellers. The casing of
all vertical pumps, except those for submarine application, shall be split verti-
cally in such a manner as to allow the removal of the rotor without disturbing
the piping attached to the pump casing or to the driving unit.
3.3.3.2 Unless otherwise specified (see 6.2.1), the bilge suction
connection shall be provided on a fitting adjacent to the pump inlet by the
pump manufacturer.
3.3.3.3 Casings shall be sufficiently rugged to withstand without fracture
or appreciable distortion the strains to which they may be subjected. The
nozzle loadings to which the pump will be subjected will be calculated by the
shipbuilder and forwarded to the pump contractor by the contracting activity
(see 6.2.1). Under the combined effect of the nozzle loads and design pressure,
no parts of the casing or other pump parts shall exceed yield strength and no
rotating clearances shall make contact.
3.3.3.4 Clearance shall be provided around bolt heads and nuts to permit
the use of ordinary tools. Ordinary tools are tools which are listed in the
Federal Supply Catalog (copies of this catalog may be consulted in the office
of the DCASMA).
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