2.8.3.1
Manufacturer's Calculations Required
a.
Foundation (including bearing and moment forces) and anchor bolts
b.
Stack (Static and Dynamic Analysis)
(1) Stresses due to various loading conditions including wind and
seismic loads
(2)
Damping of vortex shedding and seismic response
(3)
Vibration and damping
(4)
Heat transfer at various design and ambient conditions
(5)
Expansion profiles
(6)
Shipping and erection stress analysis
2.8.3.2
Construction
a.
Provide in annular air space between the two steel shells
insulation with sealing means to accommodate thermal expansion
differentials and lateral deflections or sway of inner and outer
shells.
b.
Provide openings with adequate reinforcement to minimize stress
concentrations.
c.
Design wall thickness of inner shell to be 1.60 mm 1/16 inch
thicker than that required by dynamic and static structural design
but not less than 5 mm 3/16 inch.
d.
Construct outer shell of ASTM A 242/A 242M steel with a plate
thickness not less than [_____] mm inch.
e.
Construct expansion devices of corrosion resistant stainless steel
suitable for the temperatures and flue gas combinations to be
experienced by stacks.
f.
Base construction of 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 allowable stresses of the supporting [concrete] [steel].
g.
Provide openings in breeching and stack for test equipment for
sampling flue gas and for monitoring devices. Openings shall be
properly reinforced and designed for differential expansion.
Breeching opening shall be of double wall construction.
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 stack of corrosion
resistant steel.
i.
Provide suitable anchor bolts furnished by the stack manufacturer.
j.
Accessories to be provided.
SECTION 15501N
Page 63
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