Measuring and testing – Vibration – By mechanical waves
Patent
1980-11-13
1983-07-19
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73 60L, 73 1DV, G01N 2904
Patent
active
043937110
ABSTRACT:
A method of in-service ultrasonic detection of intergranular stress corrosion cracking conditions in pipe sections of nuclear power plants. A plurality of ultrasonic return signal features and an associated general form of algorithmic combination are selected on the basis of ultrasonic pipe studies to use in distinguishing return signals from cracking conditions and geometric reflectors. A calibration pipe sample having a prearranged configuration with geometric reflectors substantially corresponding to the unknown pipe section and at least one known cracking condition is provided. Sequential ultrasonic examinations are performed using the calibration pipe sample first to enable tuning of the algorithmic combination to optimize the ability to distinguish return signals from geometric reflectors and known cracking conditions followed by an ultrasonic examination of the pipe section using the same selected return signal features and the selected algorithmic combination of the values to ascertain presence or absence of a cracking condition. A kit of parts including a crack detection instrument and a variety of calibration pipe samples corresponding to the various pipe section configurations in a nuclear power plant is also disclosed.
REFERENCES:
patent: 3453871 (1969-07-01), Krautkramer
patent: 3756071 (1973-09-01), Dury
patent: 3933026 (1976-01-01), Ham et al.
patent: 4173139 (1979-11-01), Conn
patent: 4182154 (1980-01-01), Lather et al.
patent: 4290308 (1981-09-01), Dau
Ciarlante Anthony V.
Electric Power Research Institute Inc.
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