... 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...

... indirect inspection criteria of these deep pipelines will also be addressed. Indirect Inspections Depth CIS ACVG CA DCVG INTRODUCTION Indirect Inspections as listed in NACE SP0502-2010 Pipeline External Corrosion Direct Assessment Methodology include above ground survey techniques such as Close...

... the effectiveness of combined CIPS and DCVG surveys for improved data correlation. close interval surveys CIS close interval potential surveys CIPS direct current voltage gradient DCVG combined CIPS and DCVG surveys CIPS DCVG spatial error external corrosion direct assessment ECDA stray current telluric...

... more restricted surface conditions. Various challenges encountered during ECDA for in-plant piping has led to slight modifications of the process to achieve a successful assessment. ECDA in-plant piping congested area header external corrosion direct assessment ACCA CIS DCVG ACVG INTRODUCTION...

...-interval survey CIS DC voltage gradient DCVG AC voltage gradient ACVG AC interference AC-enhanced corrosion ACEC DC interference DCI This paper will discuss three aspects related to data interpretations: Dealing with unexpected data “Threat related” versus “Tool related” ECDA indications...

... surrounding the metallic structures due to the electrolyte (soil, water) corrosivity in different regions is difficult to assess by using isolated methods/approaches. The use of DC basis technologies, such as DCVG and CIS characterize the state of the coating and cathodic protection respectively...

... 2: ECDA Tool Selection Matrix in NACE SP0502-2010 ECDA Standard Practice ⁴ . Figure 3 , 4 and 5 below depict an example of a Close Interval Survey (CIS) applicability index variable indicated when it’s equal to 0, how it is used along with other similar variables in a Tool...

... 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...

... 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...

... us that a current is induced in a conductor when it is cut by lines of magnetic force. When telluric current is flowing, it can have random frequency and varying amplitude. ¹ . Upon my arrival at the LAPS, I discovered the problems of telluric current. 1978 MY HISTORY WITH CIS BY YEAR I...

... 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...

..., but consideration also needs to be given to economic aspects. Slower interruption cycle times will cause a higher cost per mile for the CIS. Fast interruption cycles may not provide accurate data. (fast cycles are often less suitable than slower cycles where the ICCP is provided by linear or very long distributed...

... Standard Practice SP0169-2007 ( 4 ), the accident rate for underground/underwater pipelines can be significantly reduced, thus reducing the cost of corrosion and environmental damage. Introduction close interval surveys CIS close interval potential surveys CIPS direct current voltage gradient DCVG...

...ECDA CIS DCVG stray current limitations resolution measurements Introduction In situations when the ECDA process has to be conducted in areas with AC and DC (static and dynamic) stray current activity, the stray currents (SC) will likely greatly affect any voltage or current-based...

... 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...

... ” Abstract Corporations spend millions of dollars annually performing close interval potential surveys (CIS) on pipeline systems. Without research or knowledge of all influencing impressed current cathodic protection sources prior to conducting the surveys, much of the data collected may be inaccurate...

...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...

... in locating corrosion concerns on this pipeline. ECDA liquid CO₂ Guided Wave Ultrasonic Test corrosion CIS DCVG soil resistivity current attenuation INTRODUCTION In-line Inspection of pipelines can be constrained by issues relating to the ability of flow conveyed tools to navigate tight...