burner box when oil fired.
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c.
Observation Doors: Provide boiler with not less than [_____] by
250 mm 10 inch observation doors and [_____] 100 by 100 mm 4 by 4
inch peep doors.
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NOTE: At the text below, do not specify less than 8
observation doors and consider using more when it is
desired. On traveling grate stokers an observation
door should be located above each air zone on both
sides of the boiler which will probably result in
using a greater number of observation doors.
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d.
Door and Opening Frames: Frames and front plates for openings for
doors, soot blowers, overfire air openings, and other such items,
in the pressure parts shall be completely gastight and airtight.
Doors shall close against planed seats or the equivalent and shall
be provided with heavy latches. Anchor door frames securely.
There shall be no air leaks between door frames and setting.
2.2.3.8
Draft Connections
Provide draft connections through setting and steel casing for draft and
airflow connections for combustion control and metering. Provide draft
connections for measuring furnace draft, boiler outlet gas pressure, [and]
economizer outlet gas pressure, [and fly ash collector outlet gas
pressure]. Provide other openings as required for temperature elements and
other combustion control and metering items in accordance with ABMA 103,
recommended standard instrument connections unless otherwise specified.
Connection
Minimum Size
Thru setting
50 mm
Flue gas
25 mm
Air ducts (windbox)
25 mm
Connection
Minimum Size
Thru setting
2 inches
Flue gas
1 inch
Air ducts (windbox)
1 inch
2.2.4
a.
Support the boiler entirely independent of the casing and tile
work, in a manner that will allow for expansion and contraction
without straining part of boiler or affecting the setting.
Support boiler and stoker entirely on structural steel work
extending down to foundations as indicated.
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NOTE: At the text below, provisions must be made
for adequate boiler foundations based on soil
conditions at each plant location. Foundations
should be typically detailed on the drawings.
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SECTION 15502N
Page 56