MIL-HDBK-1003/3
7.2
Water Systems
7.2.1
General.
The following applies to both hot and chilled
water systems.
7.2.1.1 Exterior Water Piping Design. For exterior piping
design criteria, refer to MIL-HDBK-1003/8A.
7.2.1.2 Water Velocity. Noise, erosion, and pumping costs can
be excessive if the water velocity selected is too high.
Installation costs become excessive if the selected water
velocity is too low. Table 9 gives recommendations:
Table 9
Water Velocities
Type of Service
Recommended Velocity (fps)
General Service
4 to 7
City Water
3 to 7
Boiler Feed
6 to 15
Pump Suction and Drain Lines
4 to 7
7.2.1.3
Water Treatment. Selection of a water treatment system
is based on analysis of makeup water and its anticipated
contribution to internal corrosion and scale formation in
distribution piping and heat transfer equipment, both of which
will affect system efficiency and capacity. Obtain services of a
water treatment specialist to perform a water analysis, if not
available at the site, and to make specific recommendations on
type and quantity of chemicals used. Coordinate the decision on
type of chemicals specified with the local environmental program
manager to ensure chemicals can be properly handled and disposed
of and that pollution control regulations are properly addressed.
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