accomplished at a differential of [_____] Pa inches of water static
pressure.
2.11.9
Ash Conveyor Pipe and Fittings
Abrasion resistant cast iron alloy free of blowholes and other defects and
suitable for use in ash conveying systems.
2.11.9.1
Conveyor Piping
Centrifugally cast, abrasion resistant cast iron alloy pipe with a Brinell
hardness of not less than 280.
2.11.9.2
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.
2.11.9.3
Hangers and Supports
Provide adjustable roller supports and pipe hangers to properly support the
pipe. System supplier shall design support system and furnish supports.
2.11.9.4
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 iron alloy with wearbacks.
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 all rated not less than 538 degrees C 1000
degrees F.
2.11.9.5
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.
2.11.10
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.
2.11.11
Compressed Air Piping and Accessories
Provide pressure reducing valves, safety valves, pressure gages, manual
plug or ball valves, compressed air piping, as specified under paragraph
entitled "Piping" and other items required for a complete, operable,
2.11.12
Primary Ash Receiver-Separator and Secondary Ash Separator
Provide on top of ash silo two stages of receiving and separating, with
each stage a complete self-contained unit with efficient dust and air
SECTION 15501N
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