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|  MIL-P-17840C(SH)
3.2.9 Packing and gasket. Packing and gaskets shall be in accordance
with Drawing B-153. Packing shall be of the teflon impregnated type in accord-
ance with MIL-P-24377. Gasket compression and tolerances shall not effect
bearing bushing or wearing ring fits to an extent that will adversely affect
reliability and performance. Pump casing joints shall be made up using com-
pressed asbestos sheet gaskets or 0-rings when approved by the design review
agency.
3.2.10 Threaded fasterners. Threaded parts, such as bolts, studs, and
nuts, shall conform to FED-ST-H28, FED-STD-H28/2, and MIL-S-1222. The use of
tap-bolts or cap-screws is prohibited unless explicitly discussed and justified
in a submittal to the design review agency and approved by the design review
agency and where the use of through bolts or studs is impractical. For
temperatures under 250 degrees Fahrenheit ("F), the setting end of studs shall
be a class 2 fit or preferably a class 3 fit, both with locking resin in
accordance with MIL-S-46163, type I, grade K. The nut end shall be a class 3
fit.
3.2.10.1 The length of minimum stud engagement shall be computed as
specified in FED-STD-H28.
3.2.10.2 Unless otherwise specified (see 6.2.1), threaded fasteners of
normally stocked lengths shall be used. Male threads on threaded fasteners,
after being installed and tightened, shall protrude at least one thread beyond
the top of the nut or plastic lccking element. Excessive protrusion shall be
avoided , particularly where necessary clearances, accessibility, and safety are
important. Where practicable, the number of threads protruding shall not exceed
five; however, in no case shall thread protrusion exceed 10 threads. Washers
shall not be used for the sole purpose of lessening thread protrusion.
3.2.11 Piping root connections. Root connections for attaching pipes
shall be in accordance with Drawing B-214.
3.2.11.1 Pumps shall be fitted with flanged connections conforming to
MIL-STD-777 for suction and discharge pressure gauges or MS connections in
accordance with MS16142, as specified (see 6.2.1). All pump flanges shall have
a face circular lay finish as detailed in the applicable general note of
MIL-STD-777.
3.2.11.2 Pressure gauges, when provided with the units, shall be mounted
in accordance with Drawing 810-1385850. Gauges shall be positioned for access-
ibility of reading and maintenance. Gauges shall be secured on the parent
equipment in such a manner as to prevent vibration, breakage, and disconnection.
3.2.12 Welding. Welding and welding repair shall be in accordance with
MIL-STD-278. Brazed joints shall not be used.
3.2.13 Mercury prohibition. When specified (see 6.2.1), pumps, drivers,
and auxiliary parts furnished by the pump contractor shall be free of mercury
contamination and free of functional mercury. The manufacturer shall certify
that the pumps, drivers, and auxiliary parts, when shipped, are free from
mercury contamination (see 6.2.2).
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