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1. 发明专利

JP2003004687A Method for detecting damaged location in corrosion-proof coating of embedded metal pipes using two type of frequency signal 有权
标题翻译：使用两种频率信号检测嵌入式金属管道腐蚀防腐涂层位置的方法
公开(公告)号：JP2003004687A
公开(公告)日：2003-01-08
申请号：JP2001190748
申请日：2001-06-25
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OHIRA TAKASHI , SUZUKI SHOJI , SASAKI NOBUHIRO , KAWAKAMI MAKOTO , OBA NOBUO
IPC分类号： G01V3/02 , G01N27/20 , G01V3/12
摘要： PROBLEM TO BE SOLVED: To provide a method for detecting a damaged location in a corrosion- proof coating of embedded metal pipes capable of heightening work efficiency, reducing cost, and accurately knowing the damaged location in the coating. SOLUTION: A signal current is passed between a damaged part 3 in the coating of the metal pipe 2 embedded in the ground to which the corrosion-proof coating 1 is applied and a counter electrode 5 embedded in the ground 4 from a measuring signal transmitter 6. The potential difference of a ground surface is detected by each of wheel electrodes 10 in a receiving device 9 to detect damage in this method for detecting the damaged location in the corrosion-proof coating in the embedded metal pipe. Two types of different carrier-frequency signal currents are simultaneously supplied across the embedded metal pipe 2 and the embedded counter electrodes 5 and 7, and the signals of the two types of frequency components detected by the receiving device 9 are compared with each other to determine the damaged part 3 in the coating.
摘要翻译：要解决的问题：提供一种用于检测嵌入式金属管的防腐蚀涂层中的损坏位置的方法，其能够提高工作效率，降低成本，并准确地知道涂层中的损坏位置。解决方案：信号电流在嵌入到防腐涂层1的地面的金属管2的涂层中的损坏部分3和从测量信号发射器6嵌入地面4中的对电极5之间通过通过接收装置9中的各个车轮电极10检测地面的电位差，以检测该方法中用于检测嵌入金属管中的防腐蚀涂层中的损坏位置的损坏。在嵌入式金属管2和嵌入式对置电极5和7之间同时提供两种类型的不同的载波频率信号电流，并且将由接收装置9检测的两种类型的频率分量的信号彼此进行比较，以确定涂层中的损坏部分3。

2. 发明专利

JP2003004686A Method for detecting damaged location in corrosion-proof coating of embedded metal pipes using integrating means 有权
标题翻译：使用集成方法检测嵌入式金属管道腐蚀涂层中的损坏位置的方法
公开(公告)号：JP2003004686A
公开(公告)日：2003-01-08
申请号：JP2001189099
申请日：2001-06-22
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KOGA RYUJI , SUZUKI SHOJI , MASAGUCHI YOJI , KAWAKAMI MAKOTO
IPC分类号： G01V3/02 , G01N27/20
摘要： PROBLEM TO BE SOLVED: To provide a method for detecting a damaged location in a corrosion-proof coating in embedded metal pipes capable of facilitating measuring work, eliminating restrictions on a measuring range and a location, and highly accurately knowing the damaged location in the coating. SOLUTION: An A.C. signal current is passed between a damaged part 3 in the coating of the metal pipe 2 embedded in the ground to which the corrosion-proof coating 1 is applied and a counter electrode 5 embedded in the ground 4 from a measuring signal transmitter 6. The potential difference of a ground surface between two electrodes is detected by wheel electrodes 8 in a receiving device 7. A ground surface potential which occurs from the damage in the coating of the embedded pipe is detected to detect the damage in the device for detecting the damaged location in the corrosion-proof coating in the embedded metal pipe 2. The receiving device 7 is provided with an integrating circuit 12 for integrating the sine or cosine of the ground surface potential difference. The distribution of the ground surface potential obtained by the integration is displayed on a display device 13. From changed in the waveform thereof, the damaged location in the corrosion-proof coating 1 is detected.
摘要翻译：要解决的问题：提供一种用于检测嵌入金属管中的耐腐蚀涂层中的损坏位置的方法，其能够便于测量工作，消除对测量范围和位置的限制，并且高度准确地知道涂层中的损坏位置。解决方案：交流信号电流在嵌入到防腐涂层1的地面的金属管2的涂层中的损坏部分3和从测量信号发射器嵌入地面4中的对电极5之间通过两个电极之间的地表面的电位差由接收装置7中的车轮电极8检测。检测从嵌入管的涂层中的损坏发生的地表面电位，以检测装置中的损坏检测嵌入式金属管2的防腐蚀涂层中的损坏位置。接收装置7设置有用于积分地表电位差的正弦或余弦的积分电路12。通过积分获得的地表面电位的分布被显示在显示装置13上。从其波形的变化中，检测防腐蚀涂层1中的损坏位置。

3. 发明专利

JPH08146055A METHOD FOR MEASURING PHASE DIFFERENCE BETWEEN VOLTAGE AND CURRENT OF SIGNAL TRANSMISSION CIRCUIT 失效
公开(公告)号：JPH08146055A
公开(公告)日：1996-06-07
申请号：JP28665494
申请日：1994-11-21
申请人： NIPPON STEEL CORP
发明人： KAWAKAMI MAKOTO
IPC分类号： G01R25/00
摘要： PURPOSE: To accurately measure the phase difference of a target signal in a signal transmission circuit including a large noise signal. CONSTITUTION: In a signal transmission circuit 2, a voltage detector 3 and a current detector 4 are arranged at a signal transmitter 1 and a measurement point (P). The detection signals of the voltage detector 3 and the current detector 4 are inputted to the input of signal to be measured of two sets of double- phase lock-in amplifiers 6 and 7 with the output of a reference signal transmitter 5 for transmitting a signal with the same frequency as the signal transmitter 1 to measure the difference of phase output of the lock-in amplifiers 6 and 7, thus measuring the phase difference of voltage current at the measurement point (P).

4. 发明专利

JPH04331900A DEVICE FOR DETECTING DAMAGE ON CORROSION PREVENTING COATING ON BURIED METAL PIPE 失效
公开(公告)号：JPH04331900A
公开(公告)日：1992-11-19
申请号：JP10159591
申请日：1991-05-07
申请人： NIPPON STEEL CORP
发明人： KAWAKAMI MAKOTO
IPC分类号： F17D5/06
摘要： PURPOSE:To precisely detect a damage on a corrosion preventing coating on a buried metal pipe. CONSTITUTION:There are provided a transmitter connecting between a metal pipe 2 and a buried electrode 5, a potential difference signal detecting part 60 composed of terminals 8, 9 which are separated from each other in the longitudinal direction of the metal pipe, and which are connected to the detecting part 60, a reference signal detecting part 50 composed of a terminal 6 at the metal pipe, adjacent to the above-mentioned terminals and an underground reference electrode 7, and a lock-in amplifier 70 using a detection signal from the reference signal detecting part as a reference signal, and a detection signal from the potential difference detecting part as a measured signal, and a detector 90 including an indicator 80 for indicating an output from the amplifier. The lock-in amplifier 70 removes a reference signal and asynchronized noise voltage from the detection signal by means of an a.c. signal from the transmitter 4, and delivers a potential difference caused by the above-mentioned synchronized current to the indicator 80, thereby it is possible to detect a damage 3 on the coating in accordance with the potential difference.

5. 发明专利

JPS63191049A DETECTION OF ANTICORROSION COVER DAMAGE POSITION FOR BURIED METAL PIPES 失效
公开(公告)号：JPS63191049A
公开(公告)日：1988-08-08
申请号：JP2169087
申请日：1987-02-03
申请人： NIPPON STEEL CORP , TOKYO GAS CO LTD
发明人： KAWAKAMI MAKOTO , KURODA YOSHINORI , SAITO KIMIMASA , YAMAGUCHI KENICHI
IPC分类号： G01V3/00 , G01N27/20
摘要： PURPOSE:To detect a cover damage position accurately, by using a reference signal with the frequency the same as that of an AC signal for measurement when a ground surface potential difference is measured employing a wheel electrode. CONSTITUTION:A receiver 7 with a wheel electrode 8 is placed on the surface of ground where a metal pipe 2 provided with an anti-corrosion cover 1. An AC signal current runs is supplied by a measuring signal transmitter 6 between the metal pipe 2 and an opposed pole 5, and a potential difference is measured between two points on the ground surface with the wheel electrode 8 moving along the metal pipe 2 to be inputted into a detection signal input section of a lock-in amplifier 9. A signal with the frequency the same as that of an AC signal current is supplied from a reference signal oscillator 10 to a reference signal input section of the lock-in amplifier 9. After a noise signal with the frequency different from that of the reference signal is removed from a detection signal and changes in the phase are detected to learn the position of a cover damage part. This enables elimination of a wire for reference signal transmission thereby facilitating the detection of a damage position regardless of a longer distance between the transmitter 6 and the receiver 7.

6. 发明专利

JPS61119690A Electrolytic protection method of leg pipe of tension leg platform 失效
标题翻译：拉伸LEG平台的LEG管的电泳保护方法
公开(公告)号：JPS61119690A
公开(公告)日：1986-06-06
申请号：JP24195084
申请日：1984-11-16
申请人： Nippon Steel Corp
发明人： TANIGUCHI YASUYUKI , TAKESHI KOHEI , YOSHIDA KOTARO , KAWAKAMI MAKOTO , KAWAI HARUO
IPC分类号： C23F13/00
摘要： PURPOSE: To provide electrolytic protection to the leg pipe of a tension leg platform for a long period of time without deteriorating the corrosion fatigue characteristic thereof by subjecting the bar-shaped projections provided to the tightening raggedness of said leg pipe and steel core metals of a galvanic anode to butt welding.
CONSTITUTION: Plural pieces of the bar-shaped projections consisting of the same material as the material of the tightening ruggedness of the leg pipe of the tension leg platform which has screw joint parts 2 at both ends of a straight pipe body part 1 and is provided with plural pieces of the above-mentioned ruggedness 3 around the parts 2 are provided to the projecting parts of said ruggedness. On the other hand, the core metals 8, 9 provided with plural sectorial members at both ends thereof are welded in a weld zone 10 into an annular shape to form the galvanic anode 5 wound the part 1 of the above-mentioned leg pipe. The core metal 7 made of the steel in parallel with the axial force direction of the leg pipe provided to said electrode 5 is butt-welded to the end of the above-mentioned projections 4 in the weld zone 6. The above-mentioned anode 5 is thus attached to the leg pipe without giving adverse influence as the notch for the corrosion fatigue of the leg pipe body.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了长时间对张力腿平台的腿管提供电解保护，不会因为所述腿管的紧固和钢芯金属的弯曲而使其腐蚀疲劳特性恶化电镀阳极对接焊接。构成：多个棒状的突起，由与直管体部1的两端的螺纹接合部2相同的张力腿平台的腿管紧固坚固性材料相同的材料构成，在上述凹凸部的突出部设置有多个上述的凹凸部3。另一方面，在其两端设置有多个扇形构件的芯金属8,9在焊接区10中焊接成环状，以形成缠绕在上述腿管的一部分上的电偶极5。与设置在所述电极5上的腿管的轴向力平行的钢制的芯金属7在焊接区6中与上述突起4的端部对接。上述阳极5 因此不会对腿管的腐蚀疲劳的缺口造成不良影响。

7. 发明专利

JPS6183951A Damaged position locating method of corrosion preventive cover of buried metallic pipe 失效
标题翻译：破裂金属管的腐蚀防护罩的破坏位置定位方法
公开(公告)号：JPS6183951A
公开(公告)日：1986-04-28
申请号：JP20412884
申请日：1984-10-01
申请人： Nippon Steel Corp
发明人： KAWAKAMI MAKOTO , SHIMIZU OSAHISA
IPC分类号： G01N27/20 , G01N17/02
CPC分类号： G01N17/02
摘要： PURPOSE:To contrive improvement of detection accuracy, by applying a signal voltage of an order of 1-10Hz between a pipe covered with anti-corrosion substance being buried in the ground and an opposedly installed electrode also embedded in the ground, and detecting a position where the minimum value of two maximum values of ground surface electric potential differences is indicated in an indicator. CONSTITUTION:A signal voltage of an order of 1-10Hz is applied between a metallic pipe 2 covered on its surface with anti-corrosion substance and buried in the ground and an electrode positioned opposedly to the pipe and embedded in the ground also, and a detecting apparatus 7 provided with two electrodes 4 arranged with the specified distance apart along the longitudinal direction of the pipe 2, filter 5 and indicator 6 is made to travel along the ground surface just above the pipe 2. Further, a potential difference of the two points on the ground surface just above the pipe 2 is detected continuously and noises of DC- and AC-portions contained in a detecting signal emitted from the filter 5 and noise of the detecting signal are removed and thus, a position of the minimum value between two positions, where the ground surface potential difference shown in the apparatus 6 is indicated as maximum, is detected and accurate location of the damaged position of the pipe 2 is made available.
摘要翻译：目的：为了提高检测精度，通过在覆盖在地下的防腐蚀物质的管道和也嵌入地面的相对安装的电极之间施加1-10Hz的信号电压，并且检测位置其中地面电位差的两个最大值的最小值在指标中指示。构成：在其表面覆盖的金属管2与防腐蚀物质之间施加1〜10Hz的信号电压并埋在地下，以及与管道相对设置并嵌入地面的电极，检测装置7设置有沿着管2的长度方向隔开规定间隔设置的两个电极4，过滤器5和指示器6沿管道2正上方的地面行进。另外，两者的电位差连续地检测出在管2正上方的地面上的点，从滤波器5发出的检测信号中包含的DC和AC部分的噪声和检测信号的噪声被消除，因此，检测装置6中所示的地表面电位差被指示为最大的两个位置，并且使得管道2的损坏位置的精确位置可用。

8. 发明专利

JPS60249044A CURRENT COLLECTING WHEEL OF COATED FILM DAMAGE POSITION SEARCHING WHEEL 失效
公开(公告)号：JPS60249044A
公开(公告)日：1985-12-09
申请号：JP10446484
申请日：1984-05-25
申请人： NIPPON STEEL CORP , NITSUKEN KOUMU KK
发明人： YAMAGUCHI TOSHIO , KAWAKAMI MAKOTO , SHIMIZU OSAHISA , IIJIMA ISAO
IPC分类号： G01N27/07 , G01N27/20
摘要： PURPOSE:To improve a current collecting rate, and to search a coated film damage position with high accuracy by laminating alternately a holding plate made of an electric insulating material, and a conductive round rubber plate, and clamping and coupling them by many bolts and nuts which have been inserted through them. CONSTITUTION:A holding plate 1 made of an electric insulating material and a conductive round rubber plate 2 are laminated alternately, and on the periphery between both of them 1, 2, many metallic small pieces 3 are placed at an interval in the peripheral direction of the round rubber plate. Also, a conductor 4 for connecting each metallic small piece 3 is placed, the conductor 4 is connected to wheel inserting bearing metallic fittings 5 fixed to the center part of the holding plate 1, and each holding plate 1 and round rubber plate are clamped and coupled by a bolt 6 and a nut 7 which have been inserted over them.

9. 发明专利

JPH01227968A MEASURING METHOD FOR INSULATION RESISTANCE OF INSULATED JOINT FOR BURIED PIPE LINE 失效
公开(公告)号：JPH01227968A
公开(公告)日：1989-09-12
申请号：JP5365788
申请日：1988-03-09
申请人： NIPPON STEEL CORP
发明人： KAWAKAMI MAKOTO , SUZUKI SHOJI
IPC分类号： G01R27/02
摘要： PURPOSE:To accurately evaluate the performance of an insulated joint without being influenced by metal pipes by constituting a bridge circuit with 1st, 2nd metal pipes, variable resistor, grounding pole and reference electrode, and adjusting this variable resistor. CONSTITUTION:The insulated joint 3 is connected between the 1st and 2nd metal pipes 1, 2. One terminal of the variable resistor 4 is connected to the 1st metal pipe 1, and another terminal is connected to the grounding pole 5, then an electrode 6 is connected between the 2nd metal pipe 2 and the grounding pole 5. Further, between the reference electrode 8 inserted into the earth and each of the 1st metal pipe, 2nd metal pipe and the grounding pole 5, potentiometers 9, 11, 10 are connected respectively, thereby the bridge circuit is constituted. With this arrangement, the performance of the insulated joint can be accurately evaluated without being influenced by the metal pipes by means of measuring the insulation resistance of the insulated joint 3 from a balancing condition obtained by adjusting the variable resistor 4.

10. 发明专利

JPS6325074B2 失效
公开(公告)号：JPS6325074B2
公开(公告)日：1988-05-24
申请号：JP24195084
申请日：1984-11-16
申请人： NIPPON STEEL CORP
发明人： TANIGUCHI YASUYUKI , TAKESHI KOHEI , YOSHIDA KOTARO , KAWAKAMI MAKOTO , KAWAI HARUO
IPC分类号： C23F13/00

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