Pipe corrosion monitor

US4611175A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• Ashok Kumar · Jamkhed, IN
• Ellen G. Segan · Urbana, US
• John M. Bukowski · Urbana, US

Key dates

• Filing date: Mar 22, 1984
• Grant date: Sep 9, 1986
• Expiry date: Mar 22, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N17/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method and means for determining the corrosion status of a coated undergrd metallic object without the necessity of excavation. An electrical charge is produced on an area of the pipe, and the rate at which the charge decays is measured. The degree of corrosion of the object is measured as a function of the rate of decay of the charge and the area charged.