Method of extending life expectancy of high-temperature piping and life expectancy extension structure of high-temperature piping
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United States of America Patent
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Aug 22, 2017
Grant Date -
Jul 21, 2016
app pub date -
Jan 15, 2015
filing date -
Jan 15, 2015
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Abstract
A method of extending a life expectancy of a high-temperature piping, includes removing a heat insulation material which covers the piping having a high creep rupture risk, and lowering an outer surface temperature of piping, wherein a width of an exposed portion obtained is twice or more a distance from a peeled-off end portion of the exposed portion to a portion where a compressive stress is asymptotical to 0 after a change in stress between a tensile stress and the compressive stress occurring in the piping due to the removal of the heat insulation material is made from the tensile stress to the compressive stress, and the distance is calculated based on the following formulae, βx=5,
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