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    • 2. 发明专利
    • METALLIC MATERIAL FLAW DETECTOR
    • JPH05164746A
    • 1993-06-29
    • JP35150291
    • 1991-12-11
    • TOHO GAS KKTOKYO GAS CO LTDOSAKA GAS CO LTD
    • YAMADA ISAMUWASHIMI TAKASHIHOSOHARA YASUHARUSUZUKI KIWAMUKOSHIMIZU YUJIROMORIHARA KATSUMI
    • G01N27/90
    • PURPOSE:To prevent the deterioration of flaw detecting accuracy of a flow detecting device due to the magnetic characteristic peculiar to a metallic material when the metallic material is tested for flaws. CONSTITUTION:When an exciting signal is impressed upon an exciting coil set on a metallic material MT to be tested in a state where the standard voltage of a test piece to be used as a standard is set in a digital switch 7 and a received signal is outputted from reception coil RC, a phase difference signal corresponding to the phase difference between a reference signal corresponding to a standard signal and the received signal is outputted from a phase comparison circuit 17 and, after the phase difference signal is converted into a direct current by means of a low-pass filter 18, the signal is outputted from a terminal T5. Since a comparator 9 changes the frequency of the standard signal by driving servomotors M1 and M2 and variable resistors VR1 and VR2 until the difference between the phase difference signal and the standard voltage becomes zero, the fluctuation of the phase difference signal caused by the magnetic characteristic peculiar to the metallic material MT is corrected. Therefore, when an abruptly thickness reducing section is found during the course of moving a remote field eddy current sensor PRB, a phase difference signal corresponding to the degree of thickness reduction is outputted from the filter 18.
    • 3. 发明专利
    • FASTENING DEVICE FOR PIPE JOINTING
    • JPH0657788A
    • 1994-03-01
    • JP21601092
    • 1992-08-13
    • TOHO GAS KKREX IND CO
    • IMAGAWA TAKASHIWASHIMI TAKASHIMARUYAMA MASAAKIFUJITA YOSHITO
    • E03B7/00F16L1/00
    • PURPOSE:To improve workability by a method wherein annular pressing members provided over the circumference of a pipe are bound together, being placed facing a jointing flange on the other pipe, and the annular pressing members and the jointing flange are fastened together with a pair of fasteners. CONSTITUTION:In a pair of pipes P1 and P2, each of which is formed in an extended diameter at its one end with a jointing flange 15 provided, the end of one pipe is fitted, through a wedge-like sealing material 19, into the end in the extended diameter of the other pipe. Then, annular pressing members 18 provided over the circumference of the pipe are placed, facing a jointing flange 15 of the other pipe, and is pressed against the wedge-like sealing material 19. A first fastener 41 is then pressed from the outside to the annular pressing members 18. A second fastener 43 is provided so that it can move relatively against the first fastener 41 in the axial direction that is approximately in parallel with the axis of a fixing bolt 14. Furthermore, a movable press-down member 71, formed integral with the second fastener 43, is pressed from the outside against the jointing flange 15. The first fastener 41 and the press-down member 71 are brought close together to fasten the jointing flange 15 and the annular pressing members 18, both of which are placed in between.