EPA requirements in accordance with Section 01670 RECYCLED / RECOVERED
MATERIALS. Insulation shall be Class 5 mineral fiber block conforming to
ASTM C 612. Insulating block shall be laid in approved mortar specifically
manufactured for this purpose or recommended by the insulating material
manufacturer. Firebrick shall conform to ASTM C 27 and ASTM C 155.
Firebrick shall be interpreted to include straight brick, radial brick,
wedge brick, skew-type brick, cupola blocks, and other similar shapes.
Firebrick shall be laid up in air-setting mortar. Each brick shall be
dipped in mortar, rubbed, pushed into place, and then tapped with a wooden
mallet until it touches the adjacent bricks. Mortar thick enough to lay
with a trowel will not be permitted. Mortar shall conform to ASTM F 1097.
Maximum mortar joint thickness shall not exceed 3.2 mm 1/8 inch and average
joint thickness shall not exceed 2.0 mm 1/16 inch. Main arches of the
boiler and flue connection shall be insulated above the firebrick and,
where exposed to the weather, shall be protected with a suitable concrete
or brick slab. Firebrick floors shall be insulated from the supporting
floors with insulating brick except that if the supporting floor has full
bearing on earth, a 75 mm 3 inch layer of contained dry sand may be used in
lieu of insulating brick. Minimum thickness for walls shall be [_____] mm
inches to limit the temperature of the outer casing to 49 degrees C 120
degrees F in an ambient temperature of 21 degrees C 70 degrees F when the
unit is operating at full rated capacity, and as determined by a surface
pyrometer.
2.2.11.2
Expansion Joints
Joints shall be provided in the firebrick masonry at [approximately the
locations shown] [spacings of approximately 2.44 meters 8 feet]. Joints
shall be 12.7 mm 1/2 inch wide and shall completely separate the sections
without any interlocking of the bricks. [The locations may be changed from
those indicated by as much as 300 mm 12 inches in either direction for
convenience of construction and shall be changed as necessary, by offset or
otherwise, to avoid weakening the arch over an opening.] No expansion
joint shall be closer than 300 mm 12 inches to the vertical side of an
arched opening or to the top of the brick forming the arch over the
opening. When joints are offset, there shall be no bonding of the
horizontal faces between the two courses of brick along the offset. In
addition, to allow for expansion of the inner face, a series of 3.2 mm 1/8
inch wide vertical openings spaced 1.8 m 6 feet apart shall be provided on
the furnace side of the wall. Proper provision shall be made for expansion
and contraction between boiler foundation and floor.
2.2.12
Boiler Setting
Boiler shall be constructed to comply with ASME BPVC SEC VIII D1 and shall
be provided with insulation, steel base, water column with gauge, automatic
feed water pump control and low water cutoff, steam pressure gauge, relief
valve, automatic steam pressure control and blowoff, and soot-blower.
2.2.12.1
Boiler Foundation
Foundation structure shall be provided and installed in accordance with
manufacturer's recommendations and as indicated. Structural systems
supporting pressure parts, tubes, and refractory shall have a safety factor
to permit delivery of boiler, jacking, and rigging.
2.2.12.2
Supports
Boilers and separator drums shall be provided with support lugs and saddles
SECTION 15846A
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