Method and a system of diagnosing corrosion risk of a pipe...

Details Method and a system of diagnosing corrosion risk of a pipe... Method and a system of diagnosing corrosion risk of a pipe...

2005-03-01

2009-06-02

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S635000, C324S444000, C324S071200, C205S775500, C166S250050, C392S457000

Reexamination Certificate

active

07541817

ABSTRACT:
A method of diagnosing corrosion risk of a buried pipe due to DC stray currents and/or AC voltages induced in soil employs a metal probe including a first, exposed part having a first specific resistivity, and a second, sealed reference part having a second specific resistivity. The probe is buried in the soil, and the AC current and voltage between the pipe and the probe are measured, from which the spread resistance is determined. The resistances of the first and second probe parts are determined by respectively passing first and second excitation currents through the first and second probe parts and measuring the voltages across them. The resistance measurements are stored, and the steps are repeated periodically. The corrosion of the first probe part is determined from the measurements according to an algorithm, and the pipe corrosion risk is diagnosed from an empirical combination of the corrosion of the first probe part, the spread resistance, and the AC voltage measured.

REFERENCES:
patent: 5389216 (1995-02-01), Balkanli
patent: 5404104 (1995-04-01), Rivola et al.
patent: 5821742 (1998-10-01), Carr et al.
patent: 6160403 (2000-12-01), Kajiyama
patent: 6359434 (2002-03-01), Winslow et al.
patent: 6774814 (2004-08-01), Hilleary
patent: 6936158 (2005-08-01), Nielsen et al.
patent: 2003/0006148 (2003-01-01), Nielsen et al.
patent: 2003/0169058 (2003-09-01), Pierre et al.
patent: 2004/0232924 (2004-11-01), Hilleary et al.
patent: 2008/0260324 (2008-10-01), Takahashi et al.
patent: 2064124 (1981-06-01), None

Affiliated with

Also associated with

Rating

Method and a system of diagnosing corrosion risk of a pipe... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and a system of diagnosing corrosion risk of a pipe..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a system of diagnosing corrosion risk of a pipe... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4081733