Steam turbine system inspecting method

Details Steam turbine system inspecting method Steam turbine system inspecting method

2005-11-15

2005-11-15

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C073S627000

Reexamination Certificate

active

06965834

ABSTRACT:
The present invention provides a method of inspecting a target component part (e.g., valve casing) of an apparatus (e.g., steam control valve) included in a steam turbine system. When a time period in a range of 24 to 100 hours passes from the shutting-down of the turbine system, or before a temperature of an atmosphere surrounding the component part is lowered to 100° C., the width of the opening of the crack formed in the component part or a clearance relating to the component part is measured without disassembling the target component part and an enclosing member (e.g., valve casing) from the apparatus. As the measurement is performed when a thermal stress is induced in the component parts or when the temperature distribution is wide, the risk level of the crack or the clearance is determined accurately.

REFERENCES:
patent: 4680470 (1987-07-01), Heald
patent: 5164826 (1992-11-01), Dailey
patent: 6487922 (2002-12-01), Bauer et al.

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