JPS6429753A - Method for measuring pipe current of metal pipe - Google Patents

Method for measuring pipe current of metal pipe

Info

Publication number
JPS6429753A
JPS6429753A JP62186330A JP18633087A JPS6429753A JP S6429753 A JPS6429753 A JP S6429753A JP 62186330 A JP62186330 A JP 62186330A JP 18633087 A JP18633087 A JP 18633087A JP S6429753 A JPS6429753 A JP S6429753A
Authority
JP
Japan
Prior art keywords
pipe
current
contact
voltage
contact pieces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62186330A
Other languages
Japanese (ja)
Other versions
JP2561286B2 (en
Inventor
Hidemasa Nonaka
Akio Nakashiba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Gas Co Ltd
Original Assignee
Osaka Gas Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osaka Gas Co Ltd filed Critical Osaka Gas Co Ltd
Priority to JP62186330A priority Critical patent/JP2561286B2/en
Publication of JPS6429753A publication Critical patent/JPS6429753A/en
Application granted granted Critical
Publication of JP2561286B2 publication Critical patent/JP2561286B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE:To detect a pipe current with high accuracy with a specific operation expression by allowing four or more contact pieces to bring into contact with the inner surface of a metal pipe, and measuring a voltage between the contact pieces of the inside in a state that a constant-current source is not connected between the outermost contact pieces. CONSTITUTION:An underground buried pipe 21 is constituted by forming an asphalt cover 23 on the outer periphery of a metal pipe 22. In the pipe 22, plural mobile bodies 25-28 are inserted, and they are connected to each other by flexible cables 29-31, always keep an interval constant and run in the direction as indicated with an arrow 45. Also, on the mobile bodies 25-28, conductive contact pieces 32, 33; 36, 37; 34 and 35 are provided vertically, respectively, and their tips are brought into contact with the inner surface of the pipe 22. First of all, a voltage V1 between each contact piece 33, 36; 36, 37; 37 and 34 is measured by voltmeters 41-43, respectively. Subsequently, a DC constant-current source 38 is connected between the contact piece 32 and 35, a current DELTAI determined in advance is allowed to flow, and in the same way, a voltage V2 is measured by the voltmeters 41-43. In such a way, a pipe current I flowing in the pipe axis direction of the pipe 22 can be derived by calculating the expression I=DELTAI.V1/(V2-V1).
JP62186330A 1987-07-24 1987-07-24 How to repair underground metal pipes Expired - Lifetime JP2561286B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62186330A JP2561286B2 (en) 1987-07-24 1987-07-24 How to repair underground metal pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62186330A JP2561286B2 (en) 1987-07-24 1987-07-24 How to repair underground metal pipes

Publications (2)

Publication Number Publication Date
JPS6429753A true JPS6429753A (en) 1989-01-31
JP2561286B2 JP2561286B2 (en) 1996-12-04

Family

ID=16186458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62186330A Expired - Lifetime JP2561286B2 (en) 1987-07-24 1987-07-24 How to repair underground metal pipes

Country Status (1)

Country Link
JP (1) JP2561286B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5510712A (en) * 1994-05-02 1996-04-23 Schlumberger Technology Corporation Method and apparatus for measuring formation resistivity in cased holes
US5608323A (en) * 1993-06-10 1997-03-04 Shell Oil Company Arrangement of the electrodes for an electrical logging system for determining the electrical resistivity of a subsurface formation
JP2014158990A (en) * 2013-02-19 2014-09-04 Mitsuboshi Belting Ltd Pin hole detection method of water blocking sheet
JP2017015436A (en) * 2015-06-29 2017-01-19 株式会社福田組 Electric survey method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4831298B2 (en) * 2005-08-31 2011-12-07 電子磁気工業株式会社 Hardening depth measuring device
FR2930337B1 (en) * 2008-04-22 2011-03-25 Freyssinet SYSTEM FOR OBTAINING INFORMATION RELATING TO A PIPELINE AND ASSOCIATED METHOD
KR102218957B1 (en) * 2019-05-28 2021-02-23 경일대학교산학협력단 Pressure measurement apparatus having air-pocket structure that is placed in the building structure for safety diagnosis

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159038A (en) * 1985-12-30 1987-07-15 シユルンベルジエ　オ−バ−シ−ズ　エス．エイ． Boring-casing diagnostic device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159038A (en) * 1985-12-30 1987-07-15 シユルンベルジエ　オ−バ−シ−ズ　エス．エイ． Boring-casing diagnostic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5608323A (en) * 1993-06-10 1997-03-04 Shell Oil Company Arrangement of the electrodes for an electrical logging system for determining the electrical resistivity of a subsurface formation
US5510712A (en) * 1994-05-02 1996-04-23 Schlumberger Technology Corporation Method and apparatus for measuring formation resistivity in cased holes
JP2014158990A (en) * 2013-02-19 2014-09-04 Mitsuboshi Belting Ltd Pin hole detection method of water blocking sheet
JP2017015436A (en) * 2015-06-29 2017-01-19 株式会社福田組 Electric survey method

Also Published As

Publication number Publication date
JP2561286B2 (en) 1996-12-04

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