Abstract: An ultrasound flaw detection device which detects abnormalities within a tube while moving in the tube by pressure of water flow. The ultrasound flaw detector includes an ultrasound probe (11) which emits an ultrasound wave from an inside of the tube to a tube wall and receives an echo signal, a pulser-receiver (12) which transmits a pulse signal to the ultrasound probe and to which the received echo signal is inputted, a memory unit (14) which stores the received echo signal, a control unit (15) which controls transmitting timing of the pulse signal from the pulser-receiver to the ultrasound probe and controls writing of the received echo signal to the memory unit, and a power supply unit (19); a flexible member (25) which connects the plurality of parts of the ultrasound flaw detector; and a centering member (26) which keeps the ultrasound probe approximately centered within the tube.

Abstract: It is intended to provide an ultrasound flaw detection device of an immersion-type that is inserted into a tube and is capable of moving smoothly within the tube just with water pressure, as well as an ultrasound flaw detection system.

Abstract: An improved insert type supersonic crack hunting apparatus is capable of discovering cracks in a boiler steel tube from inside the tube. A crack hunting section provided with a probe, a slip ring for transmitting an ultrasonic signal issued from the probe, a rotary use motor for rotary the crack hunting section and an axial feed motor for moving the crack hunting section in an axial direction are connected in sequence. An axial feed nut for converting rotation of the axial feed motor into movement in the axial direction is disposed between the rotary use motor and the axial feed motor. In addition, there is provided a coupling section, in which a front end of a flexible shaft connected to the axial feed motor is coupled to a rear end of a shaft connected to the axial feed nut. An axial feed shaft thrust bearing for supporting the coupling section is disposed between the axial feed nut and the axial feed motor.

Abstract: An improved cleaning system for a horizontal type tube assembly which can achieve cleaning of the outer surfaces of the tubes in the tube assembly automatically by remote control without necessitating human labor of workers who are compelled to work in a narrow limited space, is disclosed.

Abstract: An automatic tube circumference scanning apparatus automatically performs inspections, repairs and other operation on a group of tubes arrayed in a narrow space and extending in horizontal directions. The apparatus includes an upper support/traverse section mounted on an upper tube in the group of tubes so as to be able to travel along a tube axis and to stop and grip the upper tube, a lower support/traverse section mounted on a lower tube so as to be able to travel, stop and grip the lower tube, a flexible rail extending vertically between the upper and lower support/traverse sections and fixed thereto, and a probe scanning section mounted on the flexible rail so as to be able to move up and down and which grips any arbitrary tube between the aforementioned upper and lower tubes for making a probe scan around such tube.

Abstract: An automated ultrasonic examination system for heat transfer tubes in a boiler makes it possible to perform ultrsonic examination from inside of the heat transfer tubes without necessitating the removal of scale from the outer surfaces of the boiler tubes by polishing and without necessitating access to places where manual measurements are difficult or impossible to make.

Abstract: A two-part type cable insert nozzle has spherical seats formed on a female die and a male die. An automatic restoring member restores the female die to coaxial alignment with the male die. The automatic restoring member may include a pressing element surrounding the male die between a nozzle holder for coupling together the female die and the male die and a flange portion fixedly secured to the outer circumference of a tubular portion of the male die and spaced from and opposed to the nozzle holder. Alternatively, the member may be a spring provided within cable insert holes extending through the male die and the female die.

Abstract: A cable insertion nozzle is provided of the type having a spherical seat formed by two female and male portions of a ball and socket joint, which is characterized in that in the inner peripheral surfaces of the female and male portions is formed a recess which has a rectangular shape in longitudinal cross section and a circular shape in transverse cross section when the axis of the female segment coincides with that of the male segment, and in the recess is floatably inserted a cylindrical member the end portions of which are provided with a collar section and whose inside diameter is substantially identical with the original inside diameter of the female and male segments, whereby no step is created in the inner face of the nozzle, thereby permitting smooth conveying of the cable and the like.