d.
Filters: Provide a disposable cartridge type prefilter and
afterfilter at the air dryer. Filter cartridges shall have a 517
kPa 75 psi differential pressure rating, and the design flow clean
pressure drop shall not exceed 1.40 kPa 0.2 psi.
Filter shall be
designed to remove liquid water and oil particles 5 microns and
larger. Provide an additional afterfilter for instrument air.
Filter shall combine three filter mechanisms - mechanical
separation, coalescence and absorption - in a single, cartridge
type unit. Filtration efficiency shall be greater than 99.99
percent at 0.5 micron particle size for oil and other
contaminants. A visible color change shall indicate when element
should be replaced.
e.
Pressure Reducing Regulator: Self-operating type designed for not
less than a 1724 kPa (gage) 250 psig operating pressure, a normal
operating temperature range of minus 29 degrees C 20 degrees F to
plus 66 degrees C 150 degrees F, and shall deliver constant
reduced pressure compressed air. Regulator shall have an
adjustable outlet pressure range of at least 34 to 690 kPa (gage)
5 to 100 psig with not less than 4 ranges. Provide external
adjusting screw for adjustment throughout each spring range.
Provide internal pressure tap for outlet pressure registration.
]2.8
BREECHING, EXPANSION JOINTS, STACKS AND DAMPERS
2.8.1
Breeching
Rectangular cross section, stiffened on sides, top and bottom, and
fabricated of not less than 5 mm 3/16 inch thick black steel plate unless
otherwise noted. Stiffeners shall be not less than 65 by 50 by 6 mm 2 1/2
by 2 by 1/4 inch steel angles welded to exterior with 50 mm 2 inch leg
outstanding. Separation of stiffeners shall not exceed one meter 3 feet
o.c. [Connect breeching to [each boiler flue gas outlet,] [intermediate
heat recovery equipment,] [air pollution control equipment,] [and to stack
as required].]
2.8.1.1
Breeching Access Doors
**************************************************************************
NOTE: Specify locations for breeching access and
cleanout doors. Where practical show locations on
project drawings. Show access and cleanout door
details on project drawings.
**************************************************************************
Construct access doors with frame and hinged door of cast iron or
reinforced steel plate. Frame shall be not less than 686 by 787 mm 27 by
31 inches with access opening of not less than 508 by 610 mm 20 by 24 inches.
Connection to breeching shall be gasketed and made with minimum 15 mm 1/2
inch diameter hot-dipped galvanized bolts, lockwashers, and nuts spaced not
more than 125 mm 5 inches on center. Sides of the access door shall have
not less than two quick clamp positive closing latches, with the long side
opposite the hinges containing three clamps to give a gastight seal. Side
of access door opposite the hinges shall contain a minimum 80 by 125 mm 3
by 5 inch size handle. Provide a gasket consisting of 10 mm 3/8 inch
diameter fire proof resilient rope seal and mastic compound between the
hinged access door and the access door frame. Provide breeching access
doors at the following locations [and where indicated]:
SECTION 15502N
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