MIL-P-17861F
TABLE I. Applicablity of class to size.
3.4.1 Iron castings. Gray cast iron used for pump casing impellers, and
wera plates shall meet the requirements of ASTM A 48, class No. 25 or better, or
of ASTM A 126, class B or better. Ductile (nodular) iron of ASTM A 536, or
malleable from castings may be used in lieu of gray iron castings provided the
surface has a Brinell hardness number of not less than 160.
3.4.2 Steel. Steel used for such components as pump shafts, impellers, wear
plates, skids, bases, and diffusers shall be of a type and grade normally used
by the contractor on his standard commercial units.
3.4.3 Aluminum. Aluminum for pump casing shall be a silicon-copper-aluminum
alloy or a silicon-magnesium-aluminum alloy conforming to ASTM B 26/B26M for
sand castings or ASTM B 108 for permanent mold castings, as applicable.
Pressure-containing castings shall be heat-treated as required to produce a
tensile strength of not less than 30,000 pound-force per square inch (psi) .
Acceptable alloys shall include, but not necessarily be limited to, commercial
alloys 319.0 and 356.0.
3.4.4 Bronze. Bronze castings for pump impellers, when material B or D is
specified, shall be composition bronze (alloy 85-5-5) conforming to ASTM B 62.
3.5 Desire and construction. The pump unit shall be constructed to prevent
conditions hazardous to personnel or deleterious to equipment and shall permit
easy accessibility for maintenance and service in the field. The pump unit
shall withstand the strains, jars, vibrations, and other conditions normal to
shipping, storage, and installation; and shall be complete so that, when
installed, it can be used for any operation for which it was designed.
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