Fastening structure for use at low temperature

Details Fastening structure for use at low temperature Fastening structure for use at low temperature

2007-01-30

2007-01-30

Hewitt, James M. (Department: 3679)

Pipe joints or couplings

End to side or plate

Sput

C285S329000, C285S381100, C285S905000, C403S030000, C220S560040

Reexamination Certificate

active

10845069

ABSTRACT:
A first flange and a second flange are superposed and fastened with a bolt and a nut in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange has a thickness L1and a coefficient of linear expansion α1, the second flange has a thickness L2and a coefficient of linear expansion α2, superposed first flange and second flange have a thickness L, and the bolt has a coefficient of linear expansion α, a relation of L·α≧L1·α1+L2·α2is satisfied, i.e. heat shrinkage of the bolt is not smaller than the total heat shrinkage of the first and second flanges. Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.

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Patent Abstracts of Japan, “Fastening Method of Low Thermal Expansion Coefficient Material,” vol. 2002, No. 7, Jul. 2002, & JP 2002-089519, Abstract only.

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