99543 IN SEARCH FOR CRITERIA TO AVOID EMBRITTLEMENT ON PRESTRESSED CONCRETE PIPE

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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?

Product Number: 51300-99543-SG

ISBN: 99543 1999 CP

Author: Risque L, Benedict, Richard O. Lewis

Publication Date: 1999

Industries: Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control

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In the mid-1980’s, the prestressed concrete cylinder pipe (PCCP) industry addressed pipe performance and reliability issues that arose in the 1970’s by adopting more stringent quality standards for high strength PCCP prestressing wire. Many hundreds of miles of prestressed pipe installed in the late 1960’sand 1970’shave performed very well, but some have failed due to corrosion induced failure of the prestressing wire. Cathodic protection (CP) has been installed on a number of pre-1980 PCCP pipelines, but is it always safe to do so following conventional CP protection guidelines? Should the protection criteria required to conservatively and safely protect prestress wire be selected on the basis of the age and condition of the pipeline, the physical and mechanical properties of the wire, and the environmental conditions surrounding the pipeline? What environments and wire properties favor the use of sacrificial anodes rather than impressed current systems? Keywords: Prestressed concrete cylinder pipe (PCCP), occluded cells, micro-environments, dynamic strain-aging (DSA), hydrogen embrittlement sensitivity test (HEST), hydrogen embrittlement (HE), stress corrosion cracking, critical hydrogen concentration for embrittlement.