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|  MIL-P-17639F(SH)
3.2.19 Piping, valves, and threaded items.
3.2.19.1 Valves, flanges, fittings, and bolting for pipe connections shall
conform to MIL-STD-438 for submarines and MIL-STD-777 for surface ships and as
specified in the contract or order (see 6.2.1). All pump flanges except for
welded connections shall have a face circular lay finish as detailed in the
applicable general note of MIL-STD-438 for submarines and MIL-STD-777 for surface
ships.
3.2.19.2 Tapered pipe threads are acceptable for use in grease fittings
located on nonmoving parts. Fittings not covered by MIL-STD-438 and MIL-STD-777
for application when ship connections are not involved shall be submitted for
review by the design review agency.
3.2.19.3 Threaded plugs, threaded connections, and threaded closures are
prohibited in the pressure boundary of submarine sea water pumps.
3.2.20 Locking devices. Internal threaded fasteners and threaded machine
elements shall be secured by locking devices where continuous operation under
the condition of shock, vibration, and temperature specified herein depend on
maintaining tight connections of parts. All setscrews internal to the pressure
boundary of the pump, and all setscrews on internal and external rotating
portions of the pump shall be secured by locking devices. Locking devices shall
be subject to approval by the design review agency.
3.2.21 Reverse rotation. Motor driven pumps shall withstand reverse rota-
tion for a period of 1 minute at all speeds up to design speed without damage.
3.2.22 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.
3.2.23 Self-priming pumps. Pump units which are required to be self-
priming shall be of a type approved by NAVSEA.
Type of driver.
3.2.24
The type of driver shall be as specified (see 6.2.1).
3.3 Detail requirements.
3.3.1 Unless otherwise specified (see 6.2.1), horizontal pumps shall be
flexible coupled, and vertical pumps shall be rigid coupled.
3.3.1.1 Class C-1 pumps.
3.3.1.1.1 The design shall be of the single stage, single suction, volute
type.
3.3.1 .1.2 Pumps shall have constantly rising head capacity characteristic
curves. Pumps with rated capacities of 50 gal/rein or more shall have head
capacity characteristic curves such that total head at shutoff is not less than
10 percent above total head at rated capacity.
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