MIL-HDBK-1027/4A
installed on the discharge of the water heater when a valve is installed
between heating equipment and the pool.
f) Chemical Treatment. Automatic chemical treatment should be
provided to maintain water standards and disinfection. The point of
application should be in the recirculation line, downstream of the filter,
pump, heater, and other accessories.
1) Ph balance should be monitored and controlled
automatically. The Ph level of the pool should be maintained between 7.4 and
7.6. Oxidation suffers above Ph 7.6 and corrosion and irritation increase
below Ph 7.4.
2) Chlorine. Sodium hypochlorite and calcium hypochlorite are
two products commonly used for maintaining desired chlorine levels. Gas
chlorination is not permitted. Chlorine residual should be monitored and
controlled automatically. Adjustable chlorinating equipment should be
provided with a capacity to maintain 0.6 to 5 ppm of free residual chlorine
in the pool. Pools used for water survival training will normally be
maintained with free residual chlorine levels between 1.0 and 3.0 ppm.
Chlorination equipment should have the manual capability of raising the
chlorine level for super-chlorination. Super-chlorination is periodically
required to destroy chloramines. Elimination of chloramines allows the
chemical treatment system to maintain disinfection and oxidation while also
minimizing irritants and chlorine odor.
3) Total Alkalinity. Chemical treatment should provide for
manual feed of chemicals to control total alkalinity. Total alkalinity will
normally be maintained in the 80 to 150 ppm range. Muriatic acid is used to
lower total alkalinity. Sodium bicarbonate is used to raise total
alkalinity.
4) Calcium Hardness. Chemical treatment should provide a
means for manual feed of chemicals to control calcium hardness. Calcium
chloride is used to raise calcium hardness. Lowering calcium hardness is
accomplished through dilution with make-up water.
5.2.7.2
Vacuum System. A water-operated, vacuum cleaning system should be
provided for the pool, complete with cleaning tools, hose connections, and
piping connected to the suction side of a vacuum cleaning pump. The vacuum
hose connections should be submerged and located so that all pool surfaces
may be reached with the cleaning tools. The vacuum cleaning system should
discharge from the pump to the approved waste system. In lieu of the vacuum
cleaning system described above, automatic pool cleaners and portable vacuum
cleaner systems with approved filters should also be considered.
5.2.7.3
Compressed Air Systems. Compressed air systems may be required for
diving tanks. See NAVFAC Design Manual 3.05, Compressed Air and Vacuum
Systems, for guidance in the design of compressed air systems.
5.2.7.4
Specialties. The applicability of pool covers should be evaluated,
especially for pools with sporadic use. Pool covers reduce the evaporation
rate and, thus, reduce humidity levels, make-up water, and pool water heating
requirements. Covers should be removed during breakpoint chlorination to
allow the escape of gases produced during chemical reactions associated with
breakpoint chlorination.
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