Tubular heat exchanger and method for bending tubes
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United States of America Patent
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Jun 29, 1993
Issued Date -
N/A
app pub date -
Jun 3, 1992
filing date -
May 15, 1989
priority date (Note) -
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Abstract
The method of bending relatively thin wall tubing to form a tubular heat exchanger that has relatively tight bends with controlled wrinkles. For example, 1.75-inch outer diameter stainless steel tube may have a wall thickness of 0.035 inches and be bent using a controlled-wrinkle bend die to a 180.degree. bend having a centerline radius of 2.5 inches. The relatively high tube collapse that results from bending in such manner without the use of a ball mandrel does not detract from performance of the heat exchanger in a relatively low flow rate furnace application.
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