expansion loop
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expansion loop
[ik′span·shən ′lüp] (engineering)
A complete loop installed in a pipeline to mitigate the effect of expansion or contraction of the line.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
expansion bend, expansion loop

expansion bends
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.