Gas Technology Institute
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Stress Measurement in Metal Pipes

SKU: GRI-05/0061
Stress Measurement in Metal Pipes

A method of measuring the total stress in metal pipe will improve repair/replace decisions and enhance the safety of natural gas operations. The objective of this program is to develop a sensor that can detect probable future locations of breakage in buried metal pipe due to bending stress.
Document Type
Report
Report Type
Final Report
Report Period
10/98 - 02/05
Corporate Source
Gas Technology Institute, Des Plaines, IL
Sponsor
GRI, Des Plaines, IL
Pagination
35p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
A method of measuring the total stress in metal pipe will improve repair/replace decisions and enhance the safety of natural gas operations. The objective of this program is to develop a sensor that can detect probable future locations of breakage in buried metal pipe due to bending stress. It was determined that a variation of acoustic bi-refringence is the most promising approach for identifying sections of pipe at risk. There is a linear relationship between the velocity of sound in steel and cast iron pipe and the state of stress in the pipe. An Electro-Magnetic Acoustic Transducer (EMAT) was designed and developed to generate and detect the required sound waves. Proof-of-concept measurements in both steel and cast iron show that there is enough change in velocity with stress to make the technique viable. Further development of this technique should continue.
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