... mitigation 24-hour recording measurement accuracy Cips Dcvg INTRODUCTION The new NACE Standard SP21424-2018 provides a set of simple criteria for assessing the risk of AC corrosion on existing collocations between powerlines and cathodically protected pipelines. Specifically, the AC current density...

... Corrosion Direct Assessments, and remedial program decisions. Guidance for identifying when these issues may be relevant and methods for detecting and compensating for these issues will be provided. close-interval potential survey CIPS CIS ECDA equalization current IR free measurement error metallic...

...Abstract Close Interval Potential Surveys (CIPS) and Direct Current Voltage Gradient (DCVG) surveys are important parts of any pipeline integrity or External Corrosion Direct Assessment (ECDA) program. Changes in technology and computing have introduced new tools for data acquisition and display...

... for properly interpreting survey results in a station are given. external corrosion direct assessment ECDA CIPS DCVG congested piping unpiggable facility station INTRODUCTION Effective assessment of facility piping has lagged behind assessments of cross-country pipelines. The reasons...

...Operator errors while performing a survey Close interval potential surveys and DCVG surveys are prone to errors. Survey crews must be familiar with the equipment, it’s limitations and with methods to correctly perform CIPS and DCVG surveys. Errors can occur due to the resistance of the soil. Under...

...Other strategies, such as using an integrated CIPS/DCVG survey in conjunction with a proprietary formula for calculating the %IR were successfully applied and helped dealing with the most unexpected situations encountered in the field. A more realistic analysis indicated that an excessive number...

... are discussed in detail in this paper. ECDA CIPS DCVG AC interference DC interference isolating flange INTRODUCTION An integrated close interval potential/direct current voltage gradient (CIPS/DCVG) survey ³ was conducted in 2012 on an NPS2 gas lateral in northern Ontario as part of the ECDA...

... could pose a threat to pipeline integrity, and describes the challenges encountered in developing a mitigation program. The reliability of indirect inspection tools along directionally bored sections of pipe, in correlation with special soil conditions, is also discussed. ECDA CIPS DCVG Directional...

...The findings of each existing ILI dig were then analyzed in conjunction with the CIPS/DCVG data in order to develop an adequate prioritization protocol. For example, Figure 1 indicates that dig 30-2010 was performed in this section at chainage 1209.3. A 56% through wall pit was found, which...

... 50 gas pipelines in Ontario, are presented and rationalized. Possible error scenarios resulting from neglecting the interaction between various types of indications are developed from existing sets of data. External corrosion direct assessment ECDA close-interval potential survey CIPS close...

... in current interrupters, caused by the influence of remote rectifiers, introduced by local changes in soil resistivity during the DC Voltage Gradient Survey, and produced by transient currents during the Close Interval Potential Survey. ECDA CIPS DCVG HVAC powerlines influence survey transient...

... produces data which is ideally formatted for the ECDA management software module, the productivity of the entire process was significantly improved. Close-interval potential survey close-interval survey CIPS CIS DCVG external corrosion direct assessment ECDA indirect inspection potential survey...

... survey. Close-interval potential survey close-interval survey CIPS CIS external corrosion direct assessment stress corrosion cracking direct assessment ECDA SCCDA SCC indirect inspection potential survey cathodic protection survey CP INTRODUCTION Materials Performance Feb, 1998 contains...

... output, as the maximum voltage associated with a defect is measured automatically due to the increased spacing between the two reference electrodes. There are several advantages to the combined CIPS and DCVG survey. Both sets of data are gathered at exactly the same time, in exactly the same place under...

...Question reference electrodes position CIPS test need to precisely locate the pipeline, else the soil will produce great influence to the ON/OFF result. Thus it is required to place the reference electrodes over the pipe directly. But the defects often exist in the side of the pipeline, this may...

... for the application of integrity management, such as survey selection, preparation, locating and distance measurement, data integration, and data validation. Close-interval potential survey close-interval survey CIPS CIS external corrosion direct assessment stress corrosion cracking direct assessment ECDA...

...External Corrosion Direct Assessment ECDA corrosion close interval surveys CIS close interval potential surveys CIPS Direct Current Voltage Gradient DCVG soil resistivity AC Current Attenuation surveys ACCA coatings direct assessment in-line inspections ILI pipeline integrity...