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Structural and support materials shall be steel and comply with the
applicable sections of the AISC 303 or AISC 350. [Support and stiffen
breeching as indicated].
2.8.1.5
Insulation
Provide insulation on breeching as specified in Section 15080 THERMAL
INSULATION FOR MECHANICAL SYSTEMS.
2.8.1.6
Breeching Paint
When breeching is shop fabricated, wire brush and clean interior and
exterior with a nonflammable solvent and paint with FS TT-P-28 heat
resistant paint, immediately after fabrication. When breeching is to be
fabricated on the job, prime paint steel sheets, one coat each side, prior
to delivery to job site.
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 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
kPa (gage) 5 psig to plus 34 kPa (gage) 5 psig. Expansion joints shall be
pre-formed 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
2.8.3.1
Stacks With Flue Gas Scrubbers
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NOTE: Use stack with acid resistant lining if
temperatures below dew point of flue gas are
expected in stack. Designer has to consider down
drafts in stack at low firing rate.
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Stacks shall be free standing,
self-supporting, steel construction with an
acid resistant lining system.
Provide each stack complete with all
accessories and appurtenances,
including test ports, sampling platforms,
ladders, safety climb devices,
anchors, sleeves, insulation, stainless
SECTION 15502N
Page 88