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11181 Methodology for Surveying Buried Plant Piping for Coating Condition and CP Effectiveness

Picture for 11181 Methodology for Surveying Buried Plant Piping for Coating Condition and CP Effectiveness
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Product Number: 51300-11181-SG
ISBN: 11181 2011 CP
Author: Andy Smart, Steve Biagiotti, Andy Jensen and Eric Elder
Publication Date: 2011
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$20.00
$20.00
Grounded plant piping networks and cross country pipelines are different, and so must be their respective corrosion survey methods. Pipeline coating condition and cathodic protection (CP) survey techniques do not provide meaningful data in a plant environment.

This paper presents a unique plant corrosion survey process and discusses how the subsequent graphical presentation facilitates data interpretation and analysis. A computer based data logger is used to collect Cu/CuSO4 reference cell potentials measuring areas of the plant, while dual earth current voltage gradients are collected in a rectangular co-ordinate “normal” X-Y grid. The process is called an Area Potential and Earth Current (APEC) survey. After processing, the APEC data is integrated for evaluation into a Geographic Information System (GIS) in relation to the location of all buried plant assets. The APEC survey presents a massive data set that enables this specialized indirect inspection survey methodology to provide the information necessary to define significantly active corrosion cells, determine the plant piping coating condition, and evaluate the performance of all influencing CP systems from a detailed graphical representation.

The paper introduces the APEC survey methodology, and the slide presentation will provide case histories demonstrating the effectiveness of APEC in a plant environment.

Keywords: nuclear, power plant buried pipe, cathodic protection, grounded piping, indirect inspection, pipe-to-soil, earth currents, voltage gradients, CIS, DCVG, plant piping, corrosion surveys, polarization, geographic information system, methodology, telluric current, monitoring, data loggers, rectangular coordinates, polar coordinates, area potentials
Grounded plant piping networks and cross country pipelines are different, and so must be their respective corrosion survey methods. Pipeline coating condition and cathodic protection (CP) survey techniques do not provide meaningful data in a plant environment.

This paper presents a unique plant corrosion survey process and discusses how the subsequent graphical presentation facilitates data interpretation and analysis. A computer based data logger is used to collect Cu/CuSO4 reference cell potentials measuring areas of the plant, while dual earth current voltage gradients are collected in a rectangular co-ordinate “normal” X-Y grid. The process is called an Area Potential and Earth Current (APEC) survey. After processing, the APEC data is integrated for evaluation into a Geographic Information System (GIS) in relation to the location of all buried plant assets. The APEC survey presents a massive data set that enables this specialized indirect inspection survey methodology to provide the information necessary to define significantly active corrosion cells, determine the plant piping coating condition, and evaluate the performance of all influencing CP systems from a detailed graphical representation.

The paper introduces the APEC survey methodology, and the slide presentation will provide case histories demonstrating the effectiveness of APEC in a plant environment.

Keywords: nuclear, power plant buried pipe, cathodic protection, grounded piping, indirect inspection, pipe-to-soil, earth currents, voltage gradients, CIS, DCVG, plant piping, corrosion surveys, polarization, geographic information system, methodology, telluric current, monitoring, data loggers, rectangular coordinates, polar coordinates, area potentials
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