tubes are utilized, they constitute the plane of entry.
2.1.4.9
Burners
Burners shall conform to requirements of NFPA 8501, UL 296, and UL 726,
except as otherwise specified. Flame safeguard controls shall be equipped
with repetitive self-checking circuits.
2.1.4.10
Generator
The HTW generator shall have the continuous capacity within the specified
range at the specified pressure with boiler feed water at approximately
[_____] degrees C degrees F. The flue gas outlet temperature shall be
[_____] degrees C degrees F, based on excess air of [_____] percent and
carbon loss of [_____] percent, at all loads above 50 percent of maximum
continuous capacity. Output capacity shall be based on tests of the HTW
generator [and burner] as a unit.
2.1.4.11
Nameplates
Each HTW generator shall have nameplates stamped with:
a.
Maximum continuous capacity in Watts Btuh.
b.
Radiant heating surface in square meters sq. ft.
c.
Total heating surface in square meters sq. ft.
d.
Design pressure in Pa psig.
2.2
HIGH TEMPERATURE WATER GENERATOR DETAILS
Mercury shall not be used in thermometers.
2.2.1
HTW Generators and Components
HTW generators shall be [site assembled] [shop assembled] type and arranged
to suit firing equipment as specified. The HTW generators shall be
designed for continuous operation at the capacity indicated. Unit shall be
designed to burn [fuel oil specified] [and] [coal of size and analysis
specified]. Watertube, waterwall type HTW generating units shall be
furnished complete with [oil burners] [and] [stokers for coal firing],
forced and induced draft fans, control and instrument panel with limit and
automatic controls, soot blowers, [over fire air system,] feedwater
regulator, low water flow cutoff and alarm, feed piping, and all other
fittings, auxiliaries, and appurtenances necessary for safe and efficient
operation. Firing equipment and boiler shall be matched and adjusted in
accordance with the boiler manufacturer's requirements. [The HTW generator
shall be factory-fabricated and assembled on a steel foundation or
foundations, or shipped in not more than three complete subunits to
minimize field erection.] Combustion controls shall be provided.
2.2.1.1
Headers
Boiler shall be header-and-tube construction with header diameter limited
to accommodate the water flow and required distribution with a reasonable
pressure drop. The use of drums or excessive header sizes will not be
acceptable. Headers shall be seamless steel ASTM A 106/A 106M, Grade B.
Headers shall not be located in primary radiant furnace section. Bottom
SECTION 15555A
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