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Page Title:
Piping, valves, and threaded items |
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|  MIL-P-18682D(SH)
Salient design characteristics:
(e)
(1) Capacity in gallons per minute (gal/rein).
(2) Total head in pounds per square inch
(3) Speed of shaft in r/rein.
(4) Brake hp.
(5) Test pressure (omit for submarine seawater pump).
(6) Special data vital to the unit:
a, Suction pressure (omit for submarine seawater
pump).
b. Submergence (omit for submarine seawater pump).
c. Impeller diameter.
(f)
Contract number and item number for multiple unit orders.
National stock number.
(g)
(h)
Section for Defense Contract Administration Services
Management Area (DCASMA) stamp.
(i)
NAVSEA technical manual number.
Certification data drawing number.
(j)
3.2.17.4 Each driving unit and each accessory unit shall have an identi-
fication plate in accordance with the applicable equipment specification.
3.2.18 Piping, valves, and threaded items.
3.2.18.1 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.
3.2.18.2 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.
3.2.18.3 Threaded plugs, threaded connections, and threaded closures are
prohibited in the pressure boundary of submarine pumps.
3.2.19 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 review by the design review agency.
3.2.20 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.
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