- Materials that are nutrients for fungi shall not be used.
3.5.2 Metals - Metals shall be of the corrosion-resistant type or suitably
treated to resist corrosion due to fuels, salt spray or atmospheric conditions
likely to be met in storage or normal service. The use of any protective coat-
ing that will crack or scale with age or extremes of climatic and environmental
Metals shall be inspected in accordance with
conditions shall be avoided.
Magnesium, copper, and alloys thereof shall not be used in contact
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.
Cadmium plating. Cadmium plating shall conform to QQ-P-416, Class 2,
Type II. Cadmium plating shall not be used on surfaces which would normally be
in contact with fuel(s) unless specifically approved by the procuring activity.
Castings - Castings shall be in accordance with the applicable class
designated in MIL-A-21180 and MIL-C-6021. Elongation in any specimen cut from
the casting or integrally cast with the part shall be unacceptable if less than
3.5.4 Synthetic Rubber
Age Controls - Age controls for synthetic-rubber parts shall be in
accordance with MIL-STD-1523. Wherever possible, Elastomers not subject to age
control shall be used.
Serviceability - All synthetic-rubber parts shall be readily replace-
able with a minimum removal of attaching parts.
Packings - All `O' ring packings shall conform to the dimensional
requirements of MS 29513 or MS 29512 or MIL-R-25988/l or MIL-R-83248/l and
elastomer compounds as approved by the procuring agency.
Fluids. The item specification shall state the principle fluid and
other fluids expected to be encountered in use. Fuel system components shall
normally be compatible with MIL-G-5572, MIL-T-5624, MIL-C-7024, MIL-F-27351,
TT-S-735, W-G-109, ASTM-D-1655, Types A, A-1, and B, and other comparable
fuels. In normal operation, these fuels may contain various quantities of dis-
solved and free water, salts, gases, some solid contaminants, such as sand and
3.6 Design - The ejector shall be operable in any orientation (unless otherwise
required by the model specification), providing the suction inlet is submerged
in fuel. The general design and construction shall be in accordance with para
3.6.1, 3.6.2 and 3.6.3 of MIL-F-8615.
3.6.1 Inlet Screen - When an inlet screen is required by the model specifica-
tion the ejector shall incorporate a screen with openings equivalent to No. 8
mesh, .58 to .74 mm (0.023 to 0.029 inch) diameter wire that shall completely