MIL-HDBK-1003/11
11.4.7 Water Treatment Selection Factors. See Table 13 for a general guide
to possible means of avoiding circulating water problems. For collateral
reading on the problem, refer to "Water Treatment" in the American Society
of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE), Systems
Handbook, Chapter 33.
Table 13
Circulating Water Treatment Selection Factors
Water Problem
Once-Through
Closed Recirculating
Open Recircu
Treatment System
Treatment System
Treatment S
Scale
Polyphosphates.
Chemical cleaning of
Continuous
Hydrogen-ion con-
heating equipment.
blowdown.
centration (pH) con-
Softening, pH control.
Polyphosphat
trol. Manual
pH control.
cleaning.
Softening.
Manual clean
Corrosion
Corrosion resistant
Corrosion resistant
Corrosion re
materials.
materials.
materials.
Coatings.
Deaeration.
Coatings.
Corrosion inhibitors.
Corrosion inhibitors.
Corrosion
pH control.
pH control.
inhibitors.
pH control.
Erosion
Erosion resistant
Erosion resistant
Erosion resi
materials.
materials.
materials.
Velocity limitations.
Velocity limitations.
Velocity
Removal of abrasives.
Filtration.
limitations
Filtration.
Slime and
Chlorinator.
Chlorinator.
Continuous
algae
Chemical algaecides
Chemical Algaecides.
blowdown.
and slimicides.
Manual cleaning.
Chemical
Manual cleaning.
algaecides.
Velocity
Manual clean
Delignification
None
None
pH control.
of wood
Fungus rot
None
None
Pretreatment
wood.
11.4.8 Types of Circulating Coolant Systems. The purpose of the
circulating coolant systems is to transfer heat from the heat generating
source to a lower temperature heat sink. Four examples of cooling systems
are illustrated as typical approaches to the plant design, see Figures 7, 8,
9, and 10. Efforts should be made to isolate the engine cooling circuits
from contaminated or dirty coolants as one means of ensuring proper engine
performance, maximum life, and minimum maintenance.
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