MIL-PRF-53068B
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of
a conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a first article sample shall be subjected to first
article inspection in accordance with 4.2.
3.2 Materials. Unless specified herein, materials shall be in accordance with the
manufacturer s materials specifications for water tanks. Asbestos, cadmium, and radioactive
material will not be used in this item. Radioactive material is defined by 10CFR40, and other
radioactive material in which the radioactivity is greater than 0.002 microcuries per gram or
0.01 microcuries total activity for the item. The materials shall be capable of meeting all of the
operational and environmental requirements specified herein (see 4.5.1 and 4.5.2). Recovered
materials shall be used to the maximum extent practicable.
3.2.1 Metals. All metals used in the construction of the tank shall be of a corrosion-
resistant type or shall be suitably protected to resist corrosion during the normal storage and
service life of the tank (see 3.5.5). The use of dissimilar metals in intimate metal to metal
contact shall be avoided.
3.2.2 Liner. The liner and all surfaces that contact drinking water shall conform to the
21CFR177.2600 and 21CFR1-1299 for contact with food, or be listed acceptable for contact with
drinking water by NSF Standard 14.
3.2.3 Coating compounds. Each and every compound used for the formulation of
elastomeric coating, tie gums, diffusion barrier (if used), and any other materials applied to the
coated fabric shall conform to table I and shall be suitable for use with drinking water. The
coating compounds shall be suitable for use when in continuous contact with rainwater and
ground water, and shall be fungus and weather resistant (see 4.5.3.10).
3.2.4 Coated fabric. The coated fabric shall be free from blisters or pin-holes and shall
show no signs of coating delamination. The coated fabric shall withstand the effects of humidity,
fungus, ozone, and weather elements without damage, deterioration, or failure of meeting
performance requirements specified herein. The exterior coating of the coated fabric shall be
Sand Brown, # 30277 of FED-STD-595. The coated fabric shall conform to the requirements of
table II (see 4.5.3.12).
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