Where high temperature water is utilized as a heat recovery system medium,
the system shall be provided with proper expansion tank, dump tank,
pressurization system, circulation pumps, makeup water facilities,
controls, unit heaters, and piping as specified in Section 15555A CENTRAL
HIGH TEMPERATURE WATER (HTW) GENERATING PLANT AND AUXILIARIES.
2.2.15
Pressure Gauges
Gauges shall be heavy-duty industrial type conforming to ASME B40.100,
style as required, suitable for pressure or vacuum specified, with minimum
152 mm 6 inch diameter dial, except as otherwise specified. Pressure
gauges shall be installed on each boiler, on the low-pressure side of each
pressure reducing valve, on the discharge side of each pump, and where
shown or where required for proper operation. Gauges shall be readily
accessible and easily read from the operating floor. Gauges shall be
equipped with integral or separate siphons and shall be connected by brass
pipe and fittings with shutoff cocks. Where pressure-reducing valves are
used, gauges shall be placed close to the pressure-reducing assembly, both
downstream and upstream, but connected approximately 3 m 10 feet therefrom.
Operating ranges of the gauges shall be as follows:
Pressure Range,
Gauges
kPa
kPa
Boiler
690-860
0-1380
Medium-Pressure Steam
345
0-690
Low-Pressure Steam
14-35
0-210
Boiler Feed Pump
1034
0-1380
Other Pumps
140-345
0-690
Pressure Range,
Gauges
Psig
Psig
Boiler
100-125
0-200
Medium-Pressure Steam
50
0-100
Low-Pressure Steam
2-5
0-30
Boiler Feed Pump
150
0-200
Other Pumps
20-50
0-100
2.2.16
Thermometers
Thermometers shall conform to ASME PTC 19.3, Type I, Class 3, with wells.
Mercury shall not be used in thermometers. Temperature ranges shall be
suitable for the intended use. Thermometers shall be installed in the
feedwater pipeline between the feedwater heater and boiler feed pump in the
main condensate return line before entering the surge tank, and elsewhere
as indicated or specified. Thermometers shall have straight or angle stems
as required and shall be easily read from the operating floor.
2.3
WATER TREATMENT EQUIPMENT
**************************************************************************
NOTE: The proper condition of feedwater and boiler
water is of major importance in assuring long life
and minimum maintenance of any heat recovery system.
Due to varying conditions in different locations, it
is impossible to set forth specific control
standards. If water treatment is covered in another
SECTION 15845A
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