2.16
CHEMICAL TREATMENT AND WATER SOFTENING EQUIPMENT
2.16.1
Chemical Feeder
A feeder unit shall be provided for each boiler. Chemical feeder shall be
automatic proportioning, shot type, 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.
2.16.2
Chemical Feed Pumps and Tanks
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 HTW
return line to the system circulating pumps and shall have capacity to feed
a maximum of 5.3 mL/sec 5 gph.
2.16.3
Water Softening Equipment
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NOTE: If softening equipment for makeup water is
not required as determined in accordance with TM
5-810-1 , entire paragraph should be deleted. If
water softening equipment is required, list desired
water treatment conditions; e.g., pH level,
hardness, chemical concentrations.
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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 [_____] g
grains hardness when operating at a sustained softening rate of [_____]
L/secgpm. The system shall be based on the data below. Test sets shall be
provided for pH comparator for the range [_____] to [_____] sulfide
SECTION 15555A
Page 56
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