Patent ID: 8091425
Filing Date: 2012-01-10
Classification: F16L,G01N

Abstract:
1. An ultrasonic testing method of a threaded joint of pipes or tubes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part corresponding to each part of the pin on an inner peripheral surface and being fastened with the pin by way of a lubricant, the method comprising the steps of: transmitting and receiving ultrasonic waves to and from a plurality of locations along a longitudinal axial direction of the threaded joint in at least one of the internal thread part, the metal seal part, and the shoulder part of the box; detecting echo intensities and reception times of echoes for the plurality of locations; and detecting an abnormal portion in the threaded joint based on longitudinal axial directional distribution of the echo intensities and longitudinal axial directional distribution of reception times of the echoes.