expansion fitting

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Related to expansion fitting: pipe expansion joint

expansion bend, expansion loop

expansion bends
A bend (usually in the form of a horseshoe or ?) which is inserted in a pipe run to provide for the expansion of the pipe resulting from a temperature change.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Design Tip: In lieu of steel piping with field-applied insulation and applied expansion fittings, many engineers find it more convenient and cost-effective to specify a pre-engineered listed double-wall exhaust flue system offered by many of the same manufacturers that sell boiler exhaust flues.