2.1.3.4
Ash Discharge
[Spreader stoker units with continuous or intermittent automatic mechanical
ash discharge grates, or one of the traveling grate type, shall have a
maximum loading of 2.2 Mega watts/square meter 700,000 Btuh/square foot of
grate area.] [Underfeed dumping grate units shall have a maximum loading
1.4 Mega watts/square meter 450,000 Btuh/square foot of grate, assuming a
10 percent maximum ash content and 1205 degrees C 2,200 degrees F minimum
ash softening temperature. The area shall not include side dumping areas.]
2.1.3.5
Radiant Heating Surface
Effective radiant heating surface shall be as specified in ASME BPVC SEC I.
For firetube steel firebox boilers it shall be the total water backed area
within the furnace boundaries exposed to the flame. The mean circumference
shall be used for corrugated crown sheets.
2.1.3.6
Furnace Volume
Furnace volume for watertube or firetube boilers is defined as the cubical
volume between the top of the grate and the first plane of entry into, or
between, the tubes. If screen tubes are utilized, they constitute the
plane of entry.
2.1.3.7
Boiler Operating Capacity
The boiler shall maintain continuous capacity within the specified range at
the specified pressure with boiler feedwater at a temperature of
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 maximum continuous capacity.
Moisture in steam and boiler water concentrations shall be in accordance
with ABMA Boiler 400.
2.1.3.8
Boiler Output Capacity
Output capacity of the boiler shall be based on tests of the boiler as a
unit.
2.1.3.9
Boiler Markings
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NOTE: Delete brackets if the boiler does not
include a superheater.
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Each boiler shall be stamped with:
a.
Maximum continuous capacity in Watts Btuh.
b.
Radiant heating surface in square meters square feet.
c.
Total heating surface in square meters square feet.
d.
Furnace volume in cubic meter cubic feet.
e.
Boiler unit design maximum allowable working pressure.
f.
[Superheater final steam temperature in degrees C degrees F.]
SECTION 15559A
Page 20
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