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Bag manufacturer shall furnish following actual test data for each bag
material lot used:
Permeability (ASTM D 737)
MIT Flex (ASTM D 2176)
Tensile Strength (ASTM D 1682--Method IR-T)
Mullen Burst (ASTM D 3887)
Weight (ASTM D 3776)
Thickness (ASTM D 1777)
Count (ASTM D 3775)
Yarn Weight (ASTM D 578)
Fabric Treatment Content
The fabric shall meet the following specifications.
Permeability
[_____]
MIT Flex
[_____]
Tensile Strength
[_____]
Mullen Burst
[_____]
Weight
[_____]
Thickness
[_____]
Weave Thread Count
[_____]
(warp x fill)
Yarn Weight
[_____]
Type of Finish
[_____]
Weight of Finish
[_____]
(Percent of fabric weight)
[_____]
Provide material lot analyses prior to manufacture of bags. Prior to
processing, the yarn shall be inspected for cleanliness, binder content,
broken filaments, denier and tensile strength. Substandard yarns shall be
rejected. Sizing applied to yarns shall be removed from the fabric prior
to applying the finish. Stitching used in filter bag fabrication shall be
made using [_____] thread. Filter bags shall be packaged and protected as
necessary to prevent damage during shipping and outdoor storage at the job
site. Material not meeting the requirements of this specification shall be
rejected and replaced with materials of the specified type and quality at
no additional expense to the Government. The Contracting Officer or his
representative shall have uninhibited access to areas in which the
fabrication of materials governed by the specifications takes place.
2.8.5
Hoppers
Hoppers shall be pyramidal-type fabricated from ASTM A 240/A 240M, type
317L cold-rolled steel plate having a minimum thickness of 6 mm 1/4 inch.
Hoppers shall be properly stiffened, from the outside only, and shall be
constructed with a minimum valley angle of 60 degrees from the horizontal.
Hoppers shall be of welded construction and shall be welded to the modules
to form a gas-tight unit. Welded joints shall be sealed by continuous
fillet or continuous complete penetration groove welds as applicable.
Hoppers shall span no more than one module. Steel reinforcements not in
contact with the gas or ash may be either type 317L stainless steel or ASTM
A 242/A 242M structural steel. If the latter is used, welding rods shall
be specifically selected for the service. Provide protection of rods
against moisture whether for factory or field assembly. Provide key
interlocked access doors on each hopper on both sides of any hopper baffle.
Hopper access doors shall be interlocked to fly ash level detectors to
SECTION 15864N
Page 49
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