Pressure gauges shall be installed on the low-pressure side of each
pressure reducing valve, on the suction and discharge side of each pump, on
inlets and outlets of heat exchangers, on the feedwater heater, and where
shown or required for proper operation. Pressure gauge shall be installed
on each boiler and shall have a [254.0 mm 10 inch dial] [304.8 mm 12 inch
dial] face. Gauges shall be installed so as to be accessible and easily
read from the operating floor. Gauges shall be equipped with integral or
separate siphons, and pulsation dampeners and shall be connected by brass
pipe and fittings with shutoff cocks. Where pressure reducing valves are
used, upstream and downstream gauges shall be placed close to the pressure
reducing assembly, but connected approximately 3 m 10 feet therefrom. The
operating ranges of the gauges shall be approximately twice the normal
2.21
THERMOMETERS
Thermometers shall be bimetallic type with stainless steel case and stem,
separable stem, separable thermowells, and temperature range suitable for
the use encountered. Thermometers shall be installed in the feedwater
heater storage and steam areas, boiler feed pump; in the main condensate
return line before entering the surge tank; in the combustion air inlets
and outlets of air preheaters, water inlets, and outlets of economizers; in
the suction and discharge of boiler feed pumps; in air inlets to forced and
induced draft fans; in the flue gas inlets and outlets of economizers and
air preheaters; and elsewhere as indicated or specified. Thermometers
shall have a universal joint and shall be easily read from the operating
floor. Thermometers shall have 127.0 mm 5 inch scales except where 304.8
mm 12 inch scales are required for remote reading and plus or minus 1
percent accuracy.
2.22
WATER METER
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NOTE: For boilers having less than 4,540 kg (10,000
lbs) per hour steaming capacity, a mechanical type
feedwater meter may be provided in accordance with
this paragraph. Plants having metered zeolite
softeners used exclusively for boiler makeup
purposes will not require an additional cold water
makeup water meter. Boilers over 4,540 kg (10,000
pounds) per hour capacity will have
indicating-recording meters and they shall be
integrating type where indicated.
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Water meter, including the three-valve bypass and connections, shall be
provided in the cold water makeup line [and in each boiler feedwater line].
Water meters shall be disk type with reinforced disk for hot water above
65 degrees C 150 degrees F and rubber or synthetic polymer disk for cold
water, and shall be constructed of bronze composition and cast-iron
protected by noncorrosive coating. Moving parts subject to wear shall be
easily removable. Meters shall conform to the requirements of AWWA C700.
2.23
CHEMICAL TREATMENT AND WATER SOFTENING EQUIPMENT
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NOTE: Inapplicable type of chemical feeder will be
deleted in accordance with the requirements of TM
5-810-1.
SECTION 15559A
Page 67
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