Pipe joints or couplings – Flexible joint – rigid members – Bellows
Patent
1979-05-18
1981-06-16
Callaghan, Thomas F.
Pipe joints or couplings
Flexible joint, rigid members
Bellows
428133, 428236, 428251, F16L 5102
Patent
active
042733650
ABSTRACT:
An expansion joint and a fabric which may be used in connection therewith are disclosed. The expansion joint and fabric are particularly suitable for joining conduit sections through which high temperature, highly corrosive gases are conveyed, such as flue gases in a power plant. The fabric material includes a pair of foil-fabric composites in which a metallic foil is bonded to a high temperature resistant material, such as glass cloth. Between the two foil-fabric composites is a fluid impervious barrier preferably comprising an inner metallic foil of alloy material. The foil-fabric composites are stiffer than the high temperature resistant material alone, and this limits the motion and flexibility of the expansion joint to such an extent that the inner foil is not crumpled and damaged during use and handling. At the same time the stiffening is not so great that the ability of the expansion joint to accommodate relative movement between conduit sections is substantially affected. One of the foils bonded to one of the layers of high temperature resistant material eliminates the need for an internal, rigid erosion shield in the expansion joint by providing sufficient protection against impingement on the fabric of hot, dirty gases containing high amounts of particulate matter. The other foil bonded to the other layer of high temperature resistant material protects against damage to the expansion joint material from the outside.
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