HEAT TRANSFER TUBE FOR STEAM GENERATOR AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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May 16, 2013
app pub date -
Jun 7, 2011
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Jun 28, 2010
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Abstract
In a heat transfer tube for a steam generator, a surface roughness of an inner surface of the tube is measured along a longitudinal direction and an amount of dimensional variation in a length of 50 mm taken from a measured roughness chart is 4 μm or less and an amount of bend crookedness in a portion of a length of 1000 mm from a tube end is 1 mm or less. Hence, when the tube is produced, an inspection of the tube by an eddy current flaw detection can be conducted at a high S/N ratio and hence an inspection efficiency can be improved, and when the tube is assembled into a heat exchanger, the assembling operation can be easily performed.
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