expansion differentials and lateral deflections or sway of the
inner and outer shells.
b.
Opening Reinforcement: Provide openings with adequate
reinforcement to minimize stress concentrations.
c.
Inner Shell: Design wall thickness of the inner shell to be 1.50
mm 1/16 inch thicker than that required by dynamic and static
structural design but not less than 5 mm 3/16 inch.
d.
Outer Shell: Construct of ASTM A 242/A 242M steel with a plate
thickness not less than [_____] mm inch.
e.
Expansion Devices: Construct of corrosion resistant stainless
steel suitable for the temperatures and flue gas combinations to
be experienced by the stacks.
f.
Base construction of the stack shall transmit forces and moments
in the shell to the [foundation] [supporting steel] without local
stresses of appreciable magnitude being induced in the shell or
exceeding the allowable stresses of the supporting [concrete]
[steel].
g.
Provide openings in breeching and stack for test equipment for
sampling flue gas and for metering devices. Openings shall be
properly reinforced and designed for differential expansion.
Breeching opening shall be of double wall construction. All
penetrations through inside shell of stack shall be completely
welded to provide proper sealing between the stack and the opening.
h.
Provide top 1.22 meters 4 feet cone section of the stack of
corrosion resistant steel.
i.
Anchor Bolts:
provide suitable anchor bolts.
2.7.3.2
Construction Accessories
Accessories to be provided:
a.
Cleanout Door: Provide double wall insulated steel plate door
complete with 25 mm one inch round hinge pin, gasket and not less
than 18 swing bolts.
b.
Inspection Trolley: Provide a ring of Type 304 Corrosion
Resistant Steel (CRES) to support an inspection or painter's
trolley. Weld ring and support from the stack plates with not
less that three brackets 10 by 65 by 381 mm 3/8 by 2 1/2 by 15
inches. Space brackets at not more than 610 mm 2 feet on centers
around the circumference of the stack.
Provide a three wheel CRES flat rail trolley of 227 kg 500 pound
capacity. The trolley shall have guides to prevent it from leaving
the track and a hole shall be provided in the hinge plate for the
attachment of [_____] meters feet of 6 mm 1/4 inch CRES plow steel
cable.
c.
Ladder: Provide each stack with an external ladder with cage for
the full height of the stack. Construct ladder and cage of corro
sion resistant steel in accordance with ANSI A14.3.
SECTION 15511N
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