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Page Title:
Piping valves and threade d items |
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|  MIL-P-18472G(SH)
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).
(g)
National stock number.
(h)
Section for Defense Contract Administration Service Management
Area (DCASMA) stamp.
(i)
NAVSEA technical manual number.
(j)
Certification data drawing number.
Each driving unit and each accessory unit shall
3.2.17.1 Other plates.
have an identification plate in accordance with the applicable equipment
specification.
Piping valves and threade d items. Valves, flanges, fittings, and
3.2.18
bolting for pipe connections shall conform to MIL-STD-438 for submarines and
MIL-STD-777 for surface ships and as specified (see 6.2).
Pump flanges, except
for welded connections, shall have a face circular lay finish as specified in
MIL-STD-438 for submarines and MIL-STD-777 for surface ships.
3.2.18.1 Threads and
fi ttings. Tapered pipe threads are prohibited, except
for 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.
3.2.18.2 Plugs and closures. Where thread connections are used, straight
threads with O-rings are required for thread plugs and thread closures in
pressure boundary of pumps.
3.2.19 Locking devices. Threaded fasteners and threaded machine elements
internal to the fluid boundary shall be secured by locking devices. Locking
devices shall be subject to approval by the design review agency.
3.2.19.1 Setscrews. Use of radially-oriented setscrews inside the fluid
boundary is prohibited. Where no other means of locking is practicable,
radially-oriented setscrews may be used outside the fluid boundary provided the
setscrew can be inspected without disassembly. Where setscrews are used, all of
the following requirements shall be met:
(a) At least two-setscrews shall lock the part.
(b) Setscrews shall be self-locking, nylon insert type.
(c) Setscrews shall be dog-point and shall be bottomed into and
positively engage the locking part.
(d) Setscrews shall be secured by staking the locked part at two
places 180 degrees apart.
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.
Eyebolts, lugs, holes, and other means
3.2.21 Provision for handling.
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
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