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96322 CATHODIC PROTECTION OF PRESTRESSED CONCRETE CYLINDER PIPE UTILIZING ZINC ANODES

Picture for 96322 CATHODIC PROTECTION OF PRESTRESSED
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Product Number: 51300-96322-SG
ISBN: 96322 1996 CP
Author: Risque L. Benedict, Jerald G. Ott, David H. Marshall, Dale White
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Prestressed concrete cylinder pipe (PCCP) used in two pipelines for the Tarrant County Water Control and Improvement District Number One system has experienced corrosion failure within the first ten years of service. Mechanical damage to the mortar coating during installation and/or waterhammer pressures, due to weather-related power failures which raise line pressure above the elastic strain limit of the outer mortar coating, result in cracking of the coating and develop a migration path for chlorides in the soil to reach the prestress wire. A safe, reliable cathodic protection system is required to keep the lines viable for their design life. A sacrificial zinc anode cathodic protection system was installed, both to prevent corrosion and to minimize embrittlement damage to the prestress wires. Total cost for the retrofit cathodic protection system is about four percent of the cost of the initial construction of the two lines. It is anticipated that the cathodic protection system will extend the useful life of both pipelines for decades. Keywords: calcareous exudate, cathodic protection, elastic strain limit, embrittlement, line surge, prestressed concrete cylinder pipe, strain aging, zinc sacrificial anodes.
Prestressed concrete cylinder pipe (PCCP) used in two pipelines for the Tarrant County Water Control and Improvement District Number One system has experienced corrosion failure within the first ten years of service. Mechanical damage to the mortar coating during installation and/or waterhammer pressures, due to weather-related power failures which raise line pressure above the elastic strain limit of the outer mortar coating, result in cracking of the coating and develop a migration path for chlorides in the soil to reach the prestress wire. A safe, reliable cathodic protection system is required to keep the lines viable for their design life. A sacrificial zinc anode cathodic protection system was installed, both to prevent corrosion and to minimize embrittlement damage to the prestress wires. Total cost for the retrofit cathodic protection system is about four percent of the cost of the initial construction of the two lines. It is anticipated that the cathodic protection system will extend the useful life of both pipelines for decades. Keywords: calcareous exudate, cathodic protection, elastic strain limit, embrittlement, line surge, prestressed concrete cylinder pipe, strain aging, zinc sacrificial anodes.
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98637 CATHODIC PROTECTION CRITERIA FOR PRESTRESSED CONCRETE PIPE

Product Number: 51300-98637-SG
ISBN: 98637 1998 CP
Author: Sylvia C. Hall
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10121 Cathodic Protection Monitoring of Prestressed Concrete Cylinder Pipe (PCCP)

Product Number: 51300-10121-SG
ISBN: 10121 2010 CP
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99543 IN SEARCH FOR CRITERIA TO AVOID EMBRITTLEMENT ON PRESTRESSED CONCRETE PIPE

Product Number: 51300-99543-SG
ISBN: 99543 1999 CP
Author: Risque L, Benedict, Richard O. Lewis
Publication Date: 1999
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Some of many hundreds of miles of prestressed pipe installed in the late 1960’sand 1970’s have failed due to corrosion of the prestressing wire. Is it safe to follow conventional CP protection guidelines?  Should the protection criteria be selected by age and condition of the pipeline, physical and mechanical properties of the wire, and the environmental conditions surrounding the pipeline?
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