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| MIL-D-18641F(SH)
primary means of support is the clamping action of the bolts securing the shell end flange-tube
sheet-water box flange joints of the components, nor shall nozzle flanges or piping constitute the
primary means of support of components or accessories.
3.14.6.1 Shock resistance
3.14.62 Bolts. Bolts to be stressed in shear shall be installed in holes not greater than the
following sizes:
Nominal bolt diameter
Maximum diameter of hole
inch
inch
Nominal bolt diameter plus 1/32
3/4 and smaller
Nominal bolt diameter plus 1/16
Larger than 3/4
3.14.63 Rigid supports. Units that arc rigidly supported shall not be attached to two
structures which can deflect relative to each other under shock loadings.
3.14.6.4 Shock mountings. Shock mountings shall not be used without prior approval from
NAVSEA
3.14.63 Braces. Where braces must be employed to afford stability under vibration, the braces
shall be constructed to fail under a load caused by a force equal to five times the weight of the
unit. This bad shall be acting at the center of gravity of the unit.
3.14.6.6 Snubbers. Where snubbers must be employed to limit deflection under shock loading,
the snubber shall be constructed in accordance with NAVSEA 0908-LP-000-3010.
3.14.697 Locking devices. The use of spring lock washers is not permitted. Acceptable locking
devices are self locking nuts in accordance with MS 17828, lock tab washers in accordance with
MS 18288 or lockwire.
3.14.7 Piping connections. Connection flanges (see 6.2) shall be in accordance with the
applicable schedule of MIL-STD-777 for surface ships or MIL-STD-438 for submarines as
appropriate. Root connections shall be in accordance with Drawing B 214. In lieu of instruction
shown on Drawing B 214, nozzles may be fabricated from short lengths to pipe provided with a
slip-on flange welded to one end, and pads shall be bar stock or plate of requisite thickness for
studs. Nozzles shall be of the minimum length possible for installation or removal of through bolts,
3.14.7.1 Alternate flange construction. For surface ships, the main flanges of nonferrous
fabricated water boxes or shells, the flanges of waterbox and shell nozzles, and the flanges of access
openings when provided with a neck may be of steel in accordance with ASTM A 285, grade C.
When the use of steel flanges is elected, they shall be constructed to ensure that the steel cannot
come in contact with seawater. This shall be accomplished by lining the steel flange to a depth of
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