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Page Title:
Material deterioration prevention and control |
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|  MIL-E-52649B
3.3 Materials. Materials shall be as specified herein. Materials not
specified shall be selected by the contractor, and shall be subject to all
provisions of this specification. Mounting frames and metering devices shall
be made from corrosion-resisting metals, nylon, or steel, zinc-coated in
accordance with ASTM B 633, Fe/Zn 25 SC 4, type IV. The remote control
cables, when applicable, shall be of austonitic stainless steel or lubricated
and encased in plastic sleeves.
3.3.1 Material deterioration prevention and control. The primer equipment
shall be fabricated from compatible materials, inherently corrosion resistant
or treated to provide protection against the various forms of corrosion and
deterioration that may be encountered in any of the applicable operating and
storage environments to which the primer equipment may be exposed.
3.3.1.1 Dissimilar metals. Dissimilar metals shall not be used in intimate
contact with each other unless protected against galvanic corrosion.
Dissimilar metals and methods of protection are defined and detailed in
MIL-STD-889.
3.3.1.2 Identification of materials and finishes. The contractor shall
identify the specific material, material finish or treatment for use with
component and subcomponent, and shall make information available upon request
to the contracting officer or designated representative.
3.3.2 Recovered materials. For the purpose of this requirement, recovered
materials are those materials which have been collected from solid waste and
reprocessed to become a source of raw materials, as distinguished from virgin
raw materials. The components, pieces, and parts incorporated in the primer
equipment may be newly fabricated from recovered materials to the maximum
extent practicable, provided the primer equipment produced meets all other
requirements of this specification. Used, rebuilt, or remanufactured
components, pieces, and parts shall not be incorporated in the primer
equipment.
3.4 Performance. The primer equipment shall operate to discharge a
repeatable volume of fuel within 0.5 cc of the specified volume, without
leakage, in temperatures ranging from -65 to +100 `F for 1,000 cycles.
Plastics, rubbers, and fibers utilized in the fabrication of primer equipment
shall remain functional after immersion in diethyl ether at 73 2.5 "F for
14 days.
3.5 Type III. gas propellant priming eq uipment. Type III primer equipment
shall utilize an 18-ounce cylinder conforming to MS39254 charged with engine
primer fuel with propellant as specified in O-F-1O44, type III. The primer
equipment shall be attached to the primer fuel container by screw threads
conforming to FED-STD-H28 and a rubber gasket conforming to ASTM D 2000,
class M3BG614C12E034F19, shall be provided for a leak-free connection. The
primer equipment mounting shall fix and support the fuel container vertically
and shall prohibit movement horizontally. The mount shall hold the container
by a friction, over-center type, or screw-type clamping device. The clamping
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