kilograms 2,000 pounds, whichever is heavier. Capacity shall be clearly
indicated on hoisting equipment. Factor of safety for hoisting equipment
shall be not less than five on load-sustaining parts based on ultimate
strength. Hoist shall be provided with automatic mechanical load brake and
electric motor brake, either of which will sustain rated load in any
position. Monorail shall have minimum capacity of 150 percent of heaviest
piece of equipment to be lifted or 908 kg 2,000 pounds, whichever is
heavier. Provide angle stops on the monorail at each end to prevent trolley
over-travel. Provide 460 volt, 3-phase, 60-hertz, totally-enclosed, roller
ball-bearing type motor rated on 30-minute, 55-degree C rise-duty basis,
specifically designed for NEMA Class 2--Light Duty Industrial Service for
cranes. Monorail and hoist control shall be by push button station
suspended from hoist on pendant cord of sufficient length to allow
operation from penthouse floor or walkway level. Push buttons shall
control all hoist and trolley motions and shall provide "dead-man" control
action. Enclosed reversing-type magnetic starters shall be mounted on
hoist. Upper and lower limit switches shall be provided to prevent hood
over-travel. Provide double-acting limit switch to prevent trolley
over-travel in either direction. Conductor system shall be rigid enclosed
safety-type runway conductor, supported and insulated to conform to NFPA 70.
2.7.4
Absorber Product Removal System
Provide necessary equipment, structural support steel, instrumentation, and
controls required for continuous removal, transfer, and short-term storage
of absorber product material and fly ash from the bottom hopper section of
each spray dryer absorber vessel. The design capacity of the conveying
equipment provided shall be at least 120 percent of the maximum expected
rate of accumulation of fly ash and absorber product in the vessel based on
the specified maximum inlet loadings of sulfur dioxide and particulate. The
Contractor's conveying system shall continuously transfer the collected
material to a holding bin or bins from which the ash handling system will
intermittently convey it to an ash silo. The total capacity of the holding
bins provided shall be not less than that required to store the quantity of
fly ash and absorber product material representing ten hours of operation
of the conveying system at design capacity. The holding bin or bins shall
be provided with auxiliary equipment, controls and instrumentation required
to keep the control room operator informed as to the system status,
minimize fugitive dust emissions and maintain the flow of material to the
ash handling system when needed. Structural design requirements shall be
as specified. Structural design shall be based on a density of 47 kg per
cubic meter 100 pounds per cubic feet. Capacity shall be based on a
density of 16.5 kg per cubic meter 35 pounds per cubic feet. Provide a
flanged outlet connection for interface with the ash handling system to be
provided by the Contractor.
2.8
FABRIC FILTER BAGHOUSES
**************************************************************************
NOTE: The use of an electrostatic precipitator
(ESP) with the dry scrubber instead of a fabric
filter baghouse is not acceptable.
**************************************************************************
Provide [_____] fabric filter baghouses, complete with flue gas bypass,
inlet and outlet flue gas manifolds, dampers, bags and bag attachment with
support hardware, ash collection hoppers, pulse jet or reverse gas cleaning
systems, and accessories required for a complete and operable installation.
Each fabric filter baghouse shall meet the performance criteria specified
SECTION 15864N
Page 43
Previous Page
