JPS5422890A - Location of damage of corrosion preventive coating film of steel pipe laid on water bottom - Google Patents

Location of damage of corrosion preventive coating film of steel pipe laid on water bottom

Info

Publication number
JPS5422890A
JPS5422890A JP8780877A JP8780877A JPS5422890A JP S5422890 A JPS5422890 A JP S5422890A JP 8780877 A JP8780877 A JP 8780877A JP 8780877 A JP8780877 A JP 8780877A JP S5422890 A JPS5422890 A JP S5422890A
Authority
JP
Japan
Prior art keywords
steel pipe
damage
location
coating film
water bottom
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.)
Pending
Application number
JP8780877A
Other languages
Japanese (ja)
Inventor
Takashi Fujieda
Toshiharu Miyamoto
Tatsuo Takimoto
Tsutomu Kusabetsu
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.)
Sumitomo Chemical Co Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Chemical Co Ltd
Sumitomo Electric Industries 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 Sumitomo Chemical Co Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP8780877A priority Critical patent/JPS5422890A/en
Publication of JPS5422890A publication Critical patent/JPS5422890A/en
Pending legal-status Critical Current

Links

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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE: To accurately locate even a fine flow even at a depth larger than 10m by impressing AC signals between the body of a laied pipe and water or the earth and by moving a search coil in the vicinity of a steel pipe to grasp the variation in the AC signals induced.
COPYRIGHT: (C)1979,JPO&Japio
JP8780877A 1977-07-20 1977-07-20 Location of damage of corrosion preventive coating film of steel pipe laid on water bottom Pending JPS5422890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8780877A JPS5422890A (en) 1977-07-20 1977-07-20 Location of damage of corrosion preventive coating film of steel pipe laid on water bottom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8780877A JPS5422890A (en) 1977-07-20 1977-07-20 Location of damage of corrosion preventive coating film of steel pipe laid on water bottom

Publications (1)

Publication Number Publication Date
JPS5422890A true JPS5422890A (en) 1979-02-21

Family

ID=13925266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8780877A Pending JPS5422890A (en) 1977-07-20 1977-07-20 Location of damage of corrosion preventive coating film of steel pipe laid on water bottom

Country Status (1)

Country Link
JP (1) JPS5422890A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168954A (en) * 1982-03-17 1983-10-05 ブリテイツシユ・ガス・コ−ポレ−シヨン Device for measuring defect of insulating film
JPH02295405A (en) * 1989-05-09 1990-12-06 Mametora Noki Kk Plating part in horticultural transplanter
US5404104A (en) * 1992-03-11 1995-04-04 Agip S.P.A. - Snam S.P.A. Device and method for monitoring and locating defects in, and detachment of, the protective covering of underground or immersed metal structures or pipelines
JPH10206390A (en) * 1997-01-22 1998-08-07 Kawasaki Steel Corp Method for detecting damage of covering of buried steel pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168954A (en) * 1982-03-17 1983-10-05 ブリテイツシユ・ガス・コ−ポレ−シヨン Device for measuring defect of insulating film
JPH02295405A (en) * 1989-05-09 1990-12-06 Mametora Noki Kk Plating part in horticultural transplanter
US5404104A (en) * 1992-03-11 1995-04-04 Agip S.P.A. - Snam S.P.A. Device and method for monitoring and locating defects in, and detachment of, the protective covering of underground or immersed metal structures or pipelines
JPH10206390A (en) * 1997-01-22 1998-08-07 Kawasaki Steel Corp Method for detecting damage of covering of buried steel pipe

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