section, the requirements should be reviewed for
compatibility with the requirements of waste heat
recovery systems. A study should be made as follows:
a. Internal Treatment: Conventional internal water
treatment should be used along with regular boiler
blowdown. Water treatment should consist of
alkalinity adjustments and chemical additions for
the removal of dissolved oxygen and treatment of
residual hard-scale-forming materials. Treatment
may also be required for sludge dispersal and to
prevent foaming.
The following values can be used as a guide:
pH
10.5 - 11.2
O2
0 ppm
PO4
20-40 ppm
TDS
3500 ppm, max.
b. External Treatment: Makeup water must be
treated to remove calcium, magnesium, and total
iron. Special attention should be given to water
which contains suspended solids, a high residual of
iron and sodium chloride, and dissolved oxygen.
c. Condensate Return Line Corrosion: Corrosion in
the return line will allow harmful iron oxide to
enter the boiler system where it can adhere to the
internal surfaces and reduce the heat transfer. It
is recommended that steps be taken to protect the
condensate return system from the corrosive effects
of oxygen and carbon dioxide.
For additional information concerning control of
internal chemical conditions, refer to ASME Boiler
and Pressure Vessel Code, Section VII (Recommended
Rules for Care of Power Boilers), Subsection C7.
**************************************************************************
Water treatment equipment is required and shall be as specified in Section
[_____].
2.4
BUILDING HEATING EQUIPMENT
Unit heaters and radiators for building heating shall be as specified in
Section [_____].
2.5
PIPING
Piping shall be as specified in Section [_____].
2.6
INSULATION
Insulation shall be applied in sufficient thickness to limit the surface
temperature of the lagging to not more than [50] [65] degrees C [120] [150]
degrees F when in still air at site maximum dry bulb temperature. Heat
transfer calculations shall be submitted to the Contracting Officer to
substantiate insulation material and thickness selection. Insulation shall
SECTION 15845A
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