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Title: Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement

Abstract

A method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet.

Inventors:
 [1];  [1]
  1. Pittsburgh, PA
Issue Date:
Research Org.:
Westinghouse Electric Corp., Pittsburgh, PA (United States)
OSTI Identifier:
868556
Patent Number(s):
5166627
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
DOE Contract Number:  
AC11-76PN00014
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; remote; tube; crevice; detection; current; voltage; probe; resistance; measurement; determining; extent; contact; electrically; conducting; conductive; tubesheet; surrounding; based; electrical; constant; source; applied; interior; probes; voltmeter; connected; measure; injection; inversely; proportional; amount; namely; measured; current injection; constant current; electrically conductive; electrically conducting; electrical resistance; current source; inversely proportional; resistance measurement; conductive tubes; voltage probe; conductive tube; /324/

Citation Formats

Kikta, Thomas J, and Mitchell, Ronald D. Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement. United States: N. p., 1992. Web.
Kikta, Thomas J, & Mitchell, Ronald D. Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement. United States.
Kikta, Thomas J, and Mitchell, Ronald D. Wed . "Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement". United States. https://www.osti.gov/servlets/purl/868556.
@article{osti_868556,
title = {Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement},
author = {Kikta, Thomas J and Mitchell, Ronald D},
abstractNote = {A method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

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