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[
SPECIAL APPLICATION
CHIMNEY GAS SEALS
]
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THE PROBLEM
Numerous fossil-fueled utility chimneys built between the
years 1950 and 1970 used a rope packing design as a gas seal
between adjacent sections of brick liners. Should the rope
packing leak, flue gas may attack the less resistant concrete
chimneys causing leakage and chimney deterioration.
DESIGN SOLUTION
A fabric expansion joint has been designed to eliminate the need
for the original seals as well as provide for improved inspection
and maintenance. Features of the design include:
■
Lower installed cost due to lighter weight materials.
■
Gas seal membrane for long life
■
Easily repairable by heat sealing methods
■
Easily accessible
■
Unique frame design for easy access
■
Chimney air seal
THE PROBLEM
Penetration of flue gas ducts through the chimney liner and outer shell require an air tight seal
for a pressurized chimney annulus. Leaky seals allow the flue gases to enter the annulus and
attack the outer concrete structure shell.
DESIGN SOLUTION
A dual picture frame attached to the duct and the liner
(or shell) utilizing UltraChem
™
Gas Seal Membrane is
installed to span between the two frames creating the
seal. Benefits of the design are:
■
Easily repairable by heat seal methods
■
Lower installed cost due to lighter weight materials
■
Easily accessible for inspection or repair
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