1/16 inch non-asbestos gasket suitable for the intended service between
frame and cleanout door. Cleanout doors shall be not less than 610 mm 24
inches square except where breeching dimensions are smaller, in which case
cleanout door shall be full height of the breeching and not less than 305 mm
12 inches in length.
2.8.1.5
Breeching Structural Materials
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NOTE: The designer shall detail breeching supports
and breeching stiffening. Breeching hangers shall
be designed to carry not less than 5 times the
breeching weight, or the breeching weight plus 136 kg
300 pounds whichever is greater. Hangers for
rectangular breeching shall be of the trapeze type
with angle or channel support members and hanger
rods. Breeching shall be stiffened with angle or
channel members as required to withstand internal
breeching static pressure.
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Structural and support materials shall be steel and shall comply with
applicable sections of the AISC 335. [Support and stiffen breeching as
indicated.]
2.8.2
Expansion Joints
2.8.2.1
Metallic Breeching Expansion Joints
Provide factory fabricated metallic breeching expansion joints [where
indicated]. Expansion joints shall be guided metal bellows type capable of
a minimum of [_____] mm inches of axial travel. Form metal bellows from
not less than 1.60 mm 1/16 inch thick type 321 stainless steel plate.
Cover plates shall be not less than 3 mm 1/8 inch thick steel plate.
2.8.2.2
Non-Metallic Expansion Joints
Provide factory fabricated non-metallic breeching expansion joints 3 mm 1/8
inch minimum thickness [where indicated]. Expansion joints shall be
constructed of a fluoroelastomer vulcanized to two plies of knitted wire
mesh capable of a minimum of [_____] mm inches of axial compression, [_____]
mm inches of axial extension and [_____] mm inches of lateral offset
[unless indicated otherwise]. Joints shall have a continuous operating
temperature rating of 204 degrees C 400 degrees F, with excursion design
standards up to 400 degrees C 750 degrees F. Operating pressure range
shall be minus 34 kPa (gage) 5 psig to plus 34 kPa (gage) 5 psig.
Expansion joints shall be preformed with integrally molded corners,
suitable for mounting against a 150 mm 6 inch flange. Provide carbon steel
backup bars with slotted holes, bolts, and nuts.
2.8.3
Stacks (For Installation Without Flue Gas Scrubbers)
Free standing, dual wall with insulated annular space, self supporting,
steel construction. Provide stack manufacturer's calculations for
supporting steel and concrete foundations, that suit specified design
conditions. Provide each stack complete with accessories and appurtances,
including test ports, sampling platforms, caged safety ladders, anchors,
sleeves, insulation, base and chair rings, and cleanout door.
SECTION 15501N
Page 62
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