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97564 FIELD PROGRAM ON THE USE OF COUPONS TO MONITOR CATHODIC PROTECTION OF AN UNDERGROUND PIPELINE

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Product Number: 51300-97564-SG
ISBN: 97564 1997 CP
Author: C. Dan Stears, Ross M. Degerstedt, Oliver C. Moghissi, Lee Bone
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This paper presents the results of a four year field program on the use of coupons to monitor the adequacy of the Trans Alaska Pipeline System’s (TAPS) cathodic protection systems. The objective of the program was to evaluate the use of coupons to correct for lR-drop, anode/pipe mixed potentials, and Telluric currents. Coupon monitoring assemblies were designed and installed at over 400 locations in different types of geological strata. Design guidelines, material specifications, and construction and monitoring techniques were developed to efficiently and effectively install and monitor cathodic protection coupon stations. Data evaluation included, coupons connected to the pipe and cathodic protection system (CP coupon), free corroding coupons (corrosion coupon), coupon “on” and instant-off potentials, polarization potentials, soil resistivity and temperature effects, and surface vs close proximity potentials. As a result of this field and supporting laboratory program, if was concluded that coupons can and will be used to monitor the adequacy of the TAPS cathodic protection systems. Keywords: Trans Alaska Pipeline System (TAPS), Telluric currents, lR-drop, CP coupon, corrosion coupon, cathodic protection, resistivity, polarization potentials, anode/pipe mixed potentials.
This paper presents the results of a four year field program on the use of coupons to monitor the adequacy of the Trans Alaska Pipeline System’s (TAPS) cathodic protection systems. The objective of the program was to evaluate the use of coupons to correct for lR-drop, anode/pipe mixed potentials, and Telluric currents. Coupon monitoring assemblies were designed and installed at over 400 locations in different types of geological strata. Design guidelines, material specifications, and construction and monitoring techniques were developed to efficiently and effectively install and monitor cathodic protection coupon stations. Data evaluation included, coupons connected to the pipe and cathodic protection system (CP coupon), free corroding coupons (corrosion coupon), coupon “on” and instant-off potentials, polarization potentials, soil resistivity and temperature effects, and surface vs close proximity potentials. As a result of this field and supporting laboratory program, if was concluded that coupons can and will be used to monitor the adequacy of the TAPS cathodic protection systems. Keywords: Trans Alaska Pipeline System (TAPS), Telluric currents, lR-drop, CP coupon, corrosion coupon, cathodic protection, resistivity, polarization potentials, anode/pipe mixed potentials.
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Picture for 97563 LABORATORY STUDY ON THE USE
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97563 LABORATORY STUDY ON THE USE OF COUPONS TO MONITOR CATHODIC PROTECTION OF AN UNDERGROUND PIPELINE

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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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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