hinged bypass plate to permit passage of clinkers.] Inlet and outlet
flanges shall be standard drilled pipe flange. Rotor blades and sealing
arrangement shall be the manufacturer's standard for the intended service.
When rotors are equipped with adjustable tips, provide a service door in
the body of the valve for tip adjustment. Provide packing gland type shaft
seals with suitable packing materials. Shaft bearings shall be outboard
sealed ball bearings. Periphery seals shall be such that a complete seal
is accomplished at a differential of [_____] inches of water static
pressure.
2.12.9
Ash Conveyor Pipe and Fittings
Abrasion resistant cast iron alloy free of blowholes and other defects and
suitable for use in ash conveying systems.
2.12.9.1
Conveyor Piping
Centrifugally cast, abrasion resistant cast iron alloy pipe with a Brinell
hardness of not less than 280.
2.12.9.2
Elbows and Fittings
Cast iron alloy with a Brinell hardness of not less than 350 and shall have
renewable wearbacks not less than 25 mm one inch thick.
2.12.9.3
Hangers and Supports
Provide adjustable roller supports and pipe hangers to properly support the
pipe. System supplier shall design support system and furnish supports.
2.12.9.4
Contractor's Option
At the Contractor's option, conveyor pipe handling only fly ash may be
Schedule 80 black steel pipe in lieu of the iron alloy pipe; however outlet
fitting, elbows, tees and laterals shall be cast iron alloy with wearbacks
and the pipe for a distance of one meter 3 feet after the cast iron alloy
fittings shall be cast iron alloy pipe. Provide pipe with couplings or
split flanges, bolts and gaskets, rated not less the 530 degrees C 1000
degrees F.
2.12.9.5
Expansion Joints
Stainless steel bellows type with abrasion resistant liners of a Brinell
hardness not less than 350 or slip tube expansion joints fabricated of cast
iron alloy, of Brinell hardness not less than 280, machined for smooth
sliding fit with its mating part to absorb system thermal movement and
shock loads.
2.12.10
Vacuum Air Piping
Provide from the secondary separator to the tertiary bag filter and from
the tertiary bag filter to the [steam exhauster] [mechanical exhauster] not
less than 10 gage, ASTM A 211, spiral welded, vacuum air piping with ASTM A
570/A 570M, standard radius, mitered 10 gage elbows.
2.12.11
Compressed Air Piping and Accessories
plug or ball valves, compressed air piping, as specified under paragraph
SECTION 15502N
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