Hollow plug for blocking a heat exchanger tube
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United States of America Patent
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-
Jun 11, 1991
Issued Date -
N/A
app pub date -
Dec 11, 1989
filing date -
May 15, 1987
priority date (Note) -
Expired
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Abstract
A hollow plug for blocking a heat exchanger tube includes an expansion zone expanded into a frictional connection with the heat exchanger tube. An outer surface in the expansion zone has a first part with a relatively greater surface hardness and a second part with a relatively lesser surface hardness. The first part has a greater surface hardness than the heat exchanger tube. The second part has a lesser surface hardness than the heat exchanger tube. The first part also has a relief pattern.
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