(b) Obstruction Lights:
FAA AC 150/5345-43 Type L-810.
(3) Painter's Trolley: Provide a ring of Type 304 stainless
steel to support an inspection or painter's trolley. Provide a
three wheel standard steel flat rail trolley of 227 kg 500 pounds
capacity. Guide trolley to prevent it from leaving the track.
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NOTE: Velocity cones decrease cold air down drafts
and increase velocity of discharged flue gas but
increase flow resistance of stack; they may be used
when justified.
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(4) Velocity Cone: Provide stack with an acid resistant lined
truncated velocity cone. Velocity cone shall be lined with the
same insulating refractory as applied to the stack with a 80 mm 3
inch minimum thickness. Cone shall be 1220 mm 4 feet long, bolted
to top of stack, and shall taper to a diameter of [_____] mm inches
inside.
2.8.4
Dampers
2.8.4.1
Multilouver Dampers
Provide factory fabricated parallel multilouver dampers for two position
service (open-closed) and opposed blade damper for modulating control.
Construct damper frame of distortion resistant welded steel channels with
raised seat to ensure free nonbinding operation of blades and to keep
blades square in the frame. Construct blades of [_____] mm inch thick
steel plate in a stressed skin airfoil-shape with fully welded seams
containing no external ribs. Blade deflection in mm inches shall not
exceed the length in mm inches divided by 360, consistent with AISC 335
beam deflection criteria. Blade shafts shall be stainless steel. Blades
shall be pinned to blade shafts. Louver shaft bearings shall be outboard
type and shall be self-lubricating and self-cleaning.
Bearing seals shall
be gastight.
a.
Multilouver Damper Linkage: Damper linkage shall be adjustable
and of pinned construction for easy removal and shall be designed
to handle full operation torque. Linkage on dampers in clean flue
gas areas shall operate from a single connection point.
b.
Control Damper Operators: Provide control damper operators as
shown. Operators shall be pneumatically operated with positive
positioning, manual override, and hydraulic or oil immersed gear
trains. Each operator shall be full-proportioning type, with
spring return to position shown in case of loss of power. Damper
operating speeds shall be selected and adjusted so that operators
will remain in step with controllers. Operators acting in
sequence with other operators shall have adjustment of control
sequence as required by the operating characteristics of the
system.
c.
Two-Position Damper Operations: Two-position damper operators
shall be pneumatically operated with air cylinder, four-way valve,
and solenoid valve arrangement.
SECTION 15502N
Page 92
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