Title:
METHOD FOR MEASURING FACE PRESSURE OF EQUIPMENT SEAL PART USED AT HIGH-TEMPERATURE
Document Type and Number:
Japanese Patent JP3308453
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a measuring method in which the contact face pressure of a seal part is measured under a high-temperature condition by a method wherein a numerical formula model in which the relationship between a contact thermal resistance and the contact face pressure is modeled as a contact thermal resistance element, a contact thermal resistance value is computed, the value is used as a condition value and a thermal conduction analysis is performed by a finite element method.
SOLUTION: By a temperature measuring apparatus 8, the temperature of a high-temperature fluid inside an inner tube 2 and temperatures in a plurality of measuring points on the outside surface part of an outer tube 3 are measured. A contact thermal resistance element is assumed between the pressure contact face of both an inner-tube flange 4 and an outer-tube flange 5 and the pressure contact face of a gasket 7, and a numerical formula model regarding the relationship between a contact thermal resistance and a contact face pressure is set. A contact thermal resistance value is computed by the numerical formula model, the value is used as a condition value, a steady heat conduction analysis by a finite element method is performed, and the analytical temperature in the outside surface part of the outer tube at the measuring temperature of the high-temperature fluid is computed. The error between the analytical temperature and the measured temperature of the outer tube 3 is found, the input value of the contact face pressure is changed, and the thermal conduction analysis is repeated until the error becomes a judgment value or lower.
Inventors:
Tadashi Iwayama
Application Number:
JP24271996A
Publication Date:
July 29, 2002
Filing Date:
September 13, 1996
Export Citation:
Assignee:
Kubota Corporation
International Classes:
G01L5/00; F16J15/00; G01N25/18; (IPC1-7): G01L5/00; F16J15/00; G01N25/18
Domestic Patent References:
| JP4238234A |
Attorney, Agent or Firm:
Yoshihiro Morimoto