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97563 LABORATORY STUDY ON THE USE OF COUPONS TO MONITOR CATHODIC PROTECTION OF AN UNDERGROUND PIPELINE

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Product Number: 51300-97563-SG
ISBN: 97563 1997 CP
Author: Oliver C. Moghissi, Pedro F. Lara, Lee Bone, C. Dan Stears, Ross M. Degerstedt
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This paper presents the results of a four year laboratory program to determine the correlation between the potential of a pipeline coating defect and a cathodic protection (CP) coupon buried in the same environment. The factors evaluated include exposed steel area, geometry, distance from CP anodes, and temperature. Buried pipelines and electrically bonded CP coupons experience similar effects from CP systems and interference currents (e.g. Telluric and stray). When if is impractical to correct for voltage drops in pipeline potential measurements by disconnecting all current sources, CP coupons may be used to ensure that adequate cathodic protection has been achieved. Disconnecting coupons from the pipe removes IR-drop and mixed potential emors from coupon potential measurements. This testing was designed for application to the Trans Alaska Pipeline. Site specific engineering evaluations are recommended for application of these results to other pipelines. KEYWORDS: cathodic protection, coupon, Telluric current, stray current, interference, lR-drop, monitoring, pipeline
This paper presents the results of a four year laboratory program to determine the correlation between the potential of a pipeline coating defect and a cathodic protection (CP) coupon buried in the same environment. The factors evaluated include exposed steel area, geometry, distance from CP anodes, and temperature. Buried pipelines and electrically bonded CP coupons experience similar effects from CP systems and interference currents (e.g. Telluric and stray). When if is impractical to correct for voltage drops in pipeline potential measurements by disconnecting all current sources, CP coupons may be used to ensure that adequate cathodic protection has been achieved. Disconnecting coupons from the pipe removes IR-drop and mixed potential emors from coupon potential measurements. This testing was designed for application to the Trans Alaska Pipeline. Site specific engineering evaluations are recommended for application of these results to other pipelines. KEYWORDS: cathodic protection, coupon, Telluric current, stray current, interference, lR-drop, monitoring, pipeline
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Picture for 97564 FIELD PROGRAM ON THE USE OF
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97564 FIELD PROGRAM ON THE USE OF COUPONS TO MONITOR CATHODIC PROTECTION OF AN UNDERGROUND PIPELINE

Product Number: 51300-97564-SG
ISBN: 97564 1997 CP
Author: C. Dan Stears, Ross M. Degerstedt, Oliver C. Moghissi, Lee Bone
$20.00
Picture for 98672 THE USE OF COUPONS FOR MONITORING
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98672 THE USE OF COUPONS FOR MONITORING THE CATHODIC PROTECTION OF BURIED STRUCTURES

Product Number: 51300-98672-SG
ISBN: 98672 1998 CP
Author: K. M. Lawson, N. G. Thompson
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Picture for 98661 CATHODIC PROTECTION PARAMETERS
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98661 CATHODIC PROTECTION PARAMETERS MEASURED ON CORROSION COUPONS AND PIPES BURIED IN THE FIELD

Product Number: 51300-98661-SG
ISBN: 98661 1998 CP
Author: Thomas J. Barlo
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