Magnesium and copper

Page Title: Magnesium and copper
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3.5 Materials. Materials and processes used shall be of high quality,

suitable for the purpose, and shall conform to applicable Government speci-

fications. Materials conforming to contractor's specifications may be used,

provided the specifications are approved by the procuring activity and con-

tain provisions for adequate tests. The use of contractor's specifications

shall not constitute waiver of Government inspection. All materials used

shall demonstrate adequate resistance to the fuels, fuel vapors, humidity,

salt fog, and other materials likely to be encountered in service.

3.5.1 Fungus proof. Materials that are nutrients for fungi shall not be

used where it is practical to avoid them. Where used and not hermetically

Sealed, they shall be treated with a fungicidal agent acceptable to the

procuring activity; however, if used in a hermetically sealed enclosure,

fungicidal treatment will not be necessary.

3.5.2 Metals. Metals shall be of the corrosion-resistant type or suitably

treated to resist corrosion due to fuels, salt fog, or atmospheric condi-

tions likely to be met in storage or normal service. The use of any protec-

tive coating that will crack or scale with age or extremes of climatic and

environmental conditions shall be avoided. Metals shall be inspected in

accordance with FED-STD-151.

3.5.2.1 Dissimilar metals. Unless suitably protected against electrolytic

corrosion, dissimilar metals shall not be used in intimate contact with each

other. Dissimilar metals are defined in MIL-STD-889.

3.5.2.2 Magnesium and copper. Magnesium and copper or alloys thereof shall

not be used in contact with fuel.

3.5.2.3 Cadmium. Cadmium shall not be used in contact with fuel. Where

plating is used (not in contact with fuel) it shall be in accordance with

QQ-P-416, Type II, Class 2.

3.5.2.4 Castings. Castings shall be in accordance with MIL-C-6021, Class 1

or MIL-A-21180. The minimum acceptable elongation shall be 3 percent.

3.5.3 Rubber. Rubber materials shall conform to MIL-P-5315, MIL-R-6855

Class I, MIL-R-25988 or MIL-R-83248.

3.6 Design

3.6.1 Lubrication. The pump and motor assembly shall not require any lubri-

cation or any other maintenance throughout its service life between overhauls.

Any lubricated part shall be a replaceable.sealed assembly as approved by the

procuring activity.

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