Method for measuring thickness of boiler water tube
AssigneeMitsubishi Materials Corporation
InventorsNobuhiro OGUMA, Shimpei HIROSE, Kazuya SYOJI, Masatoshi NAKAMURA, Yasuo YASUDA
Life of this patent
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Abstract
An inspection hole is formed on a side surface of a boiler water tube in a longitudinal direction, a base side of a guide pipe is connected to the inspection hole, and usually, a closing member is attached to the guide pipe. In a case where the thickness of the boiler water tube is measured, the closing member is released from the guide pipe, an ultrasonic probe is inserted into the boiler water tube from a tip side of the guide pipe, and the ultrasonic probe is moved in the boiler water tube.
Claims20
A method for measuring the thickness of a boiler water tube which measures the thickness of a boiler water tube by irradiating an inner circumferential surface of the boiler water tube with an ultrasonic wave from an ultrasonic probe while moving the ultrasonic probe inserted into the boiler water tube, the method comprising:
- forming an inspection hole on a side surface of the boiler water tube in a longitudinal direction, connecting a base side of a guide pipe to the inspection hole, and usually, attaching a closing member to the guide pipe;
- and
- releasing the closing member from the guide pipe, inserting the ultrasonic probe into the boiler water tube from a tip side of the guide pipe, and moving the ultrasonic probe in the boiler water tube when the thickness of the boiler water tube is measured
- wherein the boiler water tube is in a vertical state, the base side of the guide pipe is connected by being inclined upward in an angular range of 5 degrees to 60 degrees with respect to a shaft center of the boiler water tube, the closing member is a long bolt member, and an air pocket is not formed in a tip side of the bolt member when the bolt member is screwed into the guide pipe.
(canceled)
A method for measuring the thickness of a boiler water tube which measures the thickness of a boiler water tube by irradiating an inner circumferential surface of the boiler water tube with an ultrasonic wave from an ultrasonic probe while moving the ultrasonic probe inserted into the boiler water tube, the method comprising:
- forming an inspection hole on a side surface of the boiler water tube in a longitudinal direction, connecting a base side of a guide pipe to the inspection hole, and usually, attaching a closing member to the guide pipe;
- and
- releasing the closing member from the guide pipe, inserting the ultrasonic probe into the boiler water tube from a tip side of the guide pipe, and moving the ultrasonic probe in the boiler water tube when the thickness of the boiler water tube is measured,
- wherein the boiler water tube is in a vertical state, the base side of the guide pipe is connected by being inclined downward in an angular range of 5 degrees to 60 degrees with respect to a shaft center of the boiler water tube, and the closing member is a long bolt member.
A method for measuring the thickness of a boiler water tube which measures the thickness of a boiler water tube by irradiating an inner circumferential surface of the boiler water tube with an ultrasonic wave from an ultrasonic probe while moving the ultrasonic probe inserted into the boiler water tube, the method comprising:
- forming an inspection hole on a side surface of the boiler water tube in a longitudinal direction, connecting a base side of a guide pipe to the inspection hole, and usually, attaching a closing member to the guide pipe;
- and
- releasing the closing member from the guide pipe, inserting the ultrasonic probe into the boiler water tube from a tip side of the guide pipe, and moving the ultrasonic probe in the boiler water tube when the thickness of the boiler water tube is measured,
- wherein the boiler water tube is in a horizontal state or an inclined state, the base side of the guide pipe is connected by being inclined in an angular range of 5 degrees to 60 degrees with respect to a shaft center of the boiler water tube, the closing member is a long bolt member, and an air pocket is not formed in a tip side of the bolt member when the bolt member is screwed into with the guide pipe.
Dependencies are inferred from the claim text.