placing undue stress on any part of the boiler or setting. For lifting and
handling of the boiler, lifting lugs shall be welded to the steam drum.
Boiler skid shall be reinforced and provided with space beneath the end of
the beam for jacking the unit during installation. Holes shall be provided
in the main beam for use by a rigger to drag or lift the unit by its base
frame for final positioning, if this method recommended by boiler
manufacturer.
2.3.5.5
Boiler Casing and Insulation
Boiler shall be completely encased in a double casing and filled with
blanket insulation. Casing shall be constructed of not lighter than 3.4 mm
10 gauge welded black steel sheets. Casing shall be gastight and shall be
reinforced with structural steel to provide rigidity and prevent buckling.
Refractory or insulation behind the waterwall tubes shall be not less than
65 mm 2 1/2 inches thick. Insulation shall be of sufficient thickness to
ensure an average casing temperature in the furnace area not in excess of
60 degrees C 140 degrees F with a surface air velocity of 0.25 meters per
second 50 fpm and an ambient air temperature of 38 degrees C 100 degrees F
when operating at full capacity. Insulation material and installation
shall be as recommended by the boiler manufacturer. Exposed portion of the
boiler drum shall be insulated with mineral wool block and enclosed in a
welded 3.4 mm 10 gauge steel casing, field installed. Refractory and
insulation shall be factory installed.
2.3.5.6
Access Door and Observation Port
The boiler shall be provided with access doors in sufficient number, size
and location for cleaning, inspection and repair. Access door shall be
gastight and interior surfaces exposed to direct radiation and high
temperature shall be lined with approved refractory material to prevent
excessive heat loss. Access doors that are large or weigh more than 23 kg
50 pounds shall be hinged. In addition, at least two observation ports
with cast iron covers shall be provided, one on the front and one on the
rear wall of the furnace, so that the entire inner surface of the furnace
is visible from one or more ports.
2.3.5.7
Settling Chamber
**************************************************************************
NOTE: Specify for No. 4 and No. 6 fuel oil.
**************************************************************************
Settling chamber for the removal of fly ash shall be provided below the
last pass of the boiler with suitable means for frequent cleaning without
shutting down the boiler.
2.3.5.8
Soot Blower
**************************************************************************
NOTE: Specify for No. 4 and No. 6 fuel oil.
**************************************************************************
Boiler shall be provided with soot blower for convection bank cleaning.
Soot blower shall be steam operated, valve-in-head type and shall be
furnished complete with wall sleeve, clamps, hangers, supports, manual
operating chains and other appurtenances required for a complete
installation. The blower elements shall be so arranged that all parts of
the heating surfaces shall be cleaned of soot deposits when rotated by
SECTION 15561A
Page 30
Previous Page
