Masilela, ZPereira, J2007-02-072007-06-072007-02-072007-06-071998-06Masilela, Z and Pereira, J. 1998. Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines. Engineering Failure Analysis, vol. 5(2), pp 99-1041350-6307http://hdl.handle.net/10204/1584http://hdl.handle.net/10204/1584External coatings on buried pipelines offer the first line of defence against corrosion with cathodic protection systems in place to protect bare metal at coating defects. Holiday detection, before pipe laying, does not guarantee pipelines are without coating defects after pipe laying. The coating is more than likely to be damaged during pipe construction. The DC voltage gradient (DCVG) method, to locate coating defects on underground pipelines, was initially used for rehabilitation of older pipelines. This technique is now increasingly gaining popularity as a good quality control tool when used on newly laid pipelines to detect coating damage, most of which could be attributed to construction work. On a recently built 50 km long gas pipeline coated with fusion bonded epoxy (FBE), it was proved that more than 80% of defects located after pipe laying were due to mechanical damage during construction. The factory related defects seen were in the form of pinholes or pimples most of which could not be seen by the naked eye and relied on holiday detection for identification.518280 bytesapplication/pdfenCopyright: 1998 Elsevier Science LtdCathodic protectionCoating failuresCorrosion monitoringCorrosion protectionSurface coatingsArticleMasilela, Z., & Pereira, J. (1998). Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines. http://hdl.handle.net/10204/1584Masilela, Z, and J Pereira "Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines." (1998) http://hdl.handle.net/10204/1584Masilela Z, Pereira J. Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines. 1998; http://hdl.handle.net/10204/1584.TY - Article AU - Masilela, Z AU - Pereira, J AB - External coatings on buried pipelines offer the first line of defence against corrosion with cathodic protection systems in place to protect bare metal at coating defects. Holiday detection, before pipe laying, does not guarantee pipelines are without coating defects after pipe laying. The coating is more than likely to be damaged during pipe construction. The DC voltage gradient (DCVG) method, to locate coating defects on underground pipelines, was initially used for rehabilitation of older pipelines. This technique is now increasingly gaining popularity as a good quality control tool when used on newly laid pipelines to detect coating damage, most of which could be attributed to construction work. On a recently built 50 km long gas pipeline coated with fusion bonded epoxy (FBE), it was proved that more than 80% of defects located after pipe laying were due to mechanical damage during construction. The factory related defects seen were in the form of pinholes or pimples most of which could not be seen by the naked eye and relied on holiday detection for identification. DA - 1998-06 DB - ResearchSpace DP - CSIR KW - Cathodic protection KW - Coating failures KW - Corrosion monitoring KW - Corrosion protection KW - Surface coatings LK - https://researchspace.csir.co.za PY - 1998 SM - 1350-6307 T1 - Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines TI - Using the direct current voltage gradient technology as a quality control tool during construction of new pipelines UR - http://hdl.handle.net/10204/1584 ER -