MIL-HDBK-1005/7A
7.2.4
Materials of Construction .
Refer to paragraph 7.1.3.
7.2.4.1
Selection Factors .
Consider the following factors.
a)
Resistance to corrosion
b)
Strength against both internal and external loads
c)
Hydraulic characteristics
d)
Installation and field conditions
e)
Economic considerations
7.2.4.2
Tunnels . A thorough geologic investigation should be
undertaken in the design stage of a rock tunnel. It should be
lined if needed to attain carrying capacity. Grout the rock
seams as needed to reduce or prevent leakage. Expert guidance
should be sought in the design and construction.
7.2.4.3
Corrosion Protection . Provide adequate internal and
external protection to ensure the necessary life of the line
(refer to par. 7.3).
7.2.4.4
Preserving Low Hydraulic Friction. The following
factors tend to lower the hydraulic efficiency:
a)
Tuberculation. Pipes subjected to tuberculation
should be provided with protective lining.
b)
Slime Formation. Provide control of slime by
chemical treatment at the intake of the line. If attributable
to manganese or iron, provide for removing these substances
before the water is transmitted.
c)
Encrustations. Provide for adjusting the
chemical stability of the water as required to prevent excessive
deposition in the line.
7.2.4.5
Structural Requirements. Refer to par. 7.1 for
structural criteria. All steel pipe should be designed in
accordance with AWWA Standard C200, Steel Water Pipe - 6 in. and
Larger.
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