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A special type of high-temperature fabric expansion joint developed by Piping
Technology & Products, Inc. is the furnace sealing bag. The pictures below
show examples. The objective of the bag is to seal a furnace around the air
inlet conduits and thus prevent heat loss. Because of thermal expansion of both
the conduits and the furnace, the bag must be able to expand and contract during
normal cycles of operation.
The bag consists of a tapered sleeve formed from layers of flexible, flame-
and heat-resistant impervious fabric, which is connected at its upper end to
another sleeve in the furnace floor. The lower end of the bag is connected to
the air inlet conduit (usually a pipe) so as to form an airtight seal. The
connection to this pipe is made such that the fabric is collapsed when the
furnace is cold and extended when the furnace is hot. When required, a tapered
coil spring formed from suitable metal is installed around the conduit inside
the bag. This prevents the fabric from collapsing inward during vacuum
conditions inside the furnace. For most applications, band straps may be used to
attach the bag at both ends.
This expansion joint provides a simple and cost-effective solution to a
problem with potentially high energy losses. These bags function through the
maintenance 'shut-down' cycles for large furnaces and can be replaced after
several years of operation.
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Furnace Sealing Bag
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Layered furnace Sealing Bag
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