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MIL-D-16196E(SH)
3.16.2.1  Coll ar or stud bolts.  Where collar bolts or stud bolts are used
to make up a multiple, flange joint, so that it can be selectively disassembled,
such bolts or studs shall have a square extension beyond the threads on one end,
for use of a wrench to prevent turning of the bolt when the nuts are tightened or
removed.
3.16.2.2 Thread engagement.
Stud engagement shall be sufficient to hold
the maximum design load.
In no case shall engagement be less than the nominal
For a
Nuts shall be fully engaged in all cases.
diameter of the fastener.
threaded fastener, not less than one thread but not more than four threads shall
protrude beyond the crown of the nut.
3.17  Piping. valves and fittings.
Piping, valves, fittings, and associated
piping components shall be in accordance with MIL-STD-777 for surface ships, and
in accordance with MIL-STD-438 for submarines except as modified herein (see
6.2).
In addition to brazing flanges allowed in accordance with MIL-STD-777,
welded copper-nickel flanges of either the slip-on or weld-neck design are
Root connections
acceptable provided that interface geometry is not affected.
shall be in accordance with Drawing B-214 to minimize stress connections and
Methods and types shown on Drawing B-214
provide increased wall thickness.
The location and general arrangement of
illustrate the desired principles.
piping shall provide access for take down and maintenance.
Flanges for pipe connections shall be 150 lb/in2 in
3.17.1  Flanges.
accordance with MIL-F-20042, except flanges in submarine installations shall be
as specified (see 6,2).
3.18 Welding and allied processes.
Fabrication and inspection of welded
and silver brazed piping joints shall be in accordance with MIL-STD-278.
Casting inspection and repair shall
3.18.1  Casting inspection and repair.
be in accordance with MIL-STD-278.
3.19 General features.
3.19.1  Primary requir ements .
Characteristics not normally incorporated
Primary
in the design of commercial equipment shall be required on Naval ships.
requirements which are the basis for the design of Naval equipment shall be as
follows:
(a) Mean-time-between-failure (MTBF) not less than 2,000 hours
Total operating hours
When:
MTBF -
No. of failures that prevent the unit
from performing its mission.
(b) Mean-time-to-repair (MTTR) not more than 12 hours.
(c) Time between overhauls not less than 5 years.
Standard stock materials, parts, and hard-
3.19.2  Standard stock items.
ware shall be used.
For the purpose of this specification, standard stock is
defined as material listed in the Federal Supply Catalog and includes stock items
(Copies
such as bearings, grease, oil, wire, bolts, screws, nuts, and washers.

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