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PRCI PR-255-9616
- Fiber Optic Strain Monitoring of Pipelines
- Report / Survey by Pipeline Research Council International, 01/01/2000
- Publisher: PRCI
$98.00$195.00
L51778e
McDermott Technology
Need: In current practice, pressurized pipeline walls are subject to large stress and strain. Under static conditions, the strain remains unchanged, but under adverse conditions such as corrosion, earthquakes, unstable soils, etc., the strain may increase with time. A method is needed for the early detection and location of excessive strain in pipelines. With such detailed knowledge, repair and stabilization work may be performed in a timely manner at reduced cost and before a catastrophic failure.
Benefit: The objective of this project was to demonstrate the feasibility of using fiber optic Bragg grating sensors (BGS) to measure axial and bending strain in pipes. Work was performed by McDermott Technology Inc. (MTI) and included BGS design and procurement. In addition to the pipe strain testing, a number of other evaluations were performed. Several methods were evaluated to protect and encapsulate the BGS, which are embedded inside an optical fiber, and strain transfer tests were performed on two of the encapsulation approaches. A high strain bending test to failure was performed on one BGS. A special test section was used to characterize the performance of the BGS and compare to standard electrical resistance foil strain gages.
Result: Based on the very encouraging results obtained from this project, MTI recommends continued development with the ultimate goal of commercialization of the technology for pipeline strain monitoring. In the next phase of work, additional promising methods of fiber encapsulation and manufacture should be investigated with emphasis on low potential production cost. Confirmatory tests must be performed on the final encapsulation method to verify that strain components (axial, bending, and hoop) can be separated and that the fiber remains immobilized. A long length of fiber with embedded BGS and encapsulated in a continuous stainless steel sheath should be manufactured.
McDermott Technology
Need: In current practice, pressurized pipeline walls are subject to large stress and strain. Under static conditions, the strain remains unchanged, but under adverse conditions such as corrosion, earthquakes, unstable soils, etc., the strain may increase with time. A method is needed for the early detection and location of excessive strain in pipelines. With such detailed knowledge, repair and stabilization work may be performed in a timely manner at reduced cost and before a catastrophic failure.
Benefit: The objective of this project was to demonstrate the feasibility of using fiber optic Bragg grating sensors (BGS) to measure axial and bending strain in pipes. Work was performed by McDermott Technology Inc. (MTI) and included BGS design and procurement. In addition to the pipe strain testing, a number of other evaluations were performed. Several methods were evaluated to protect and encapsulate the BGS, which are embedded inside an optical fiber, and strain transfer tests were performed on two of the encapsulation approaches. A high strain bending test to failure was performed on one BGS. A special test section was used to characterize the performance of the BGS and compare to standard electrical resistance foil strain gages.
Result: Based on the very encouraging results obtained from this project, MTI recommends continued development with the ultimate goal of commercialization of the technology for pipeline strain monitoring. In the next phase of work, additional promising methods of fiber encapsulation and manufacture should be investigated with emphasis on low potential production cost. Confirmatory tests must be performed on the final encapsulation method to verify that strain components (axial, bending, and hoop) can be separated and that the fiber remains immobilized. A long length of fiber with embedded BGS and encapsulated in a continuous stainless steel sheath should be manufactured.
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