shall be 300 mm 12 inches in diameter and a maximum of 10 meters 35 feet in
length or 200 mm 8 inches in diameter and a maximum of 7.32 meters 24 feet
in length. Each bag shall have at least eight for 300 mm 12 inch bags or
five for 200 mm 8 inch bags sewn-in rings of welded steel, galvanized or
cadmium plated, or welded stainless steel after fabrication. Bags shall
attach to the thimbles by means of quick release clamps. Clamps shall not
require tools for adjustments or installation. Upper bag suspensions shall
provide for ease of adjustment, tensiding, and bag replacement. The
suspension shall not use threaded members such as bolts and nuts for
adjustment or attachment of bags. Bag caps and other suspension hardware
that comes in direct contact with the bag fabric shall be cadmium-plated
steel or stainless steel. The method of attaching the bags to the cap and
thimble shall provide a leakproof seal. The Contractor shall supply insert
materials necessary to precoat the bags for initial start-up on oil.
2.8.2.1
Spare Equipment
Furnish ten percent extra bags and ten percent extra clamps.
2.8.3
Bag Guarantee
Bags and cages, or bags and sliprings, as applicable, shall be guaranteed
for 2 calendar years from startup. In case of failure during that period,
Contractor shall supply a replacement without cost to Government.
Contractor shall provide the number of spare bags, and cages, if
applicable, required to replace the bags in baghouse. These bags, and
cages if applicable, shall not be used as replacement during startup and
testing. If bag, and cage, if applicable, replacement exceeds 10 percent
in any compartment during the first 2 years, replacement of all bags, and
cages, if applicable, in that compartment shall be provided by the
Contractor at no cost to the Government. The replacement bags, and cages,
if applicable, shall be guaranteed for an additional 2 years. Bags shall
be inspected for creases, folds, abrasions, holes, and tears prior to
installation. Any bag with one or more of the preceding imperfections
shall be rejected. Cages or rings, as applicable, shall be inspected for
corrosions, sharp edges, bends, bad or broken welds, eccentricity, or burrs
prior to installation. Any cage or ring with one or more of the preceding
imperfections shall be rejected.
2.8.4
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NOTE F: Factors involved in selecting fabric filter
bag materials include:
1.
Duration of cleaning.
2.
Type of cleaning arrangements.
3.
System temperature level.
4.
Coal type.
5.
Sulfur dioxide removal efficiency.
NEEDLED felts are most commonly specified for
pulse-jet units. Precoat bags with fly ash prior to
operation. Fabric specifications are dependent upon
material.
SECTION 15864N
Page 48
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