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2.23.1
Chemical Feeder
A feeder unit shall be provided for each boiler. Chemical feeder shall be
automatic proportioning, shot, or pump type. All appurtenances necessary
for satisfactory operation shall be provided. Size and capacity of feeder
shall be based upon local requirements and water analysis. Chemical feed
pumps and tanks shall be furnished as a package with the pumps mounted on
and piping connected to the tank. The pump cylinders, plungers, ball check
valves, and check valve bodies shall be of corrosion-resistant materials
suitable for the chemicals being pumped. Volumetric accuracy of the pumps
shall be within one percent over the range indicated. Pump capacities
shall be adjustable by positioning crank pin with micrometer setscrews.
Stroke length scale shall be divided in percentage graduations engraved on
scale. Cylinders shall be replaceable for increased or reduced pressure or
capacity ranges. Drive motors shall be suitable for the electrical power
available and shall have drip-proof enclosures. Tanks shall be made of
polypropylene and mounted on legs. Tanks shall have filling and drain
connections and gauge glass. Each tank shall be furnished with one pump,
mounted and piped with black iron pipe and fittings, with suction strainer
and stainless steel screen, and with 13 mm 1/2 inch relief valve with steel
body and stainless steel trim. Each tank shall have hinged cover. Tank
bottom shall be dished concave to a radius equal to the diameter of the
tank. Units shall be for phosphate or caustic feed and sulfite feeding.
Motor-driven agitator shall be provided. The pump shall be designed to
feed the chemical solutions into the boiler feedwater system.
2.23.2
Water Softening Equipment
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NOTE: Need for softening equipment for makeup water
will be as determined in accordance with TM 5-810-1.
If water softening is not required, delete the
paragraph.
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A [single] [double] unit automatic water softener system shall be provided
as indicated. The system shall be designed for a working pressure of
[_____] Pa psig. The system shall be complete with raw and regenerate
water distribution; under drain; inlet and outlet connection in upper and
lower header respectively; resin removal connecting pipe legs; control
valve for service, backwash, regenerate, and rinse; water meters, pressure
gauges, brine storage, and measuring tank and controls for automatic
operation. Brine tank shall be either hot-dipped galvanized after
fabrication or polypropylene. Brine piping shall be either all copper pipe
and fittings or Schedule 80 PVC. The equipment shall have a total capacity
between regenerations of not less than [_____] liters gallons of water of
[_____] grams grains hardness when operating at a sustained softening rate
of [_____] L/second gpm. The system shall be based on the data below.
Test sets shall be provided for pH comparator for the range [_____] to
[_____] sulfite comparator, and phosphate comparator.
2.23.2.1
Water Analysis
The source of the raw water is [_____].
The analysis of the water is
approximately as follows:
SECTION 15559A
Page 68
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