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[ILLUSTRATION OMITTED] In this project, Pipeline Current Mapper (PCM), Direct Current Voltage Gradient (DCVG), and Close Interval Survey (CIS) were three applicable indirect assessment tools for collecting data for thorough analysis on the cathodic protection (CP) of certain sections of the 20- and 24-inch transmission pipelines.
In exchange for being able to ratchet up the pressure, SPLC will conduct a Close Interval Survey every two to three feet along the pipeline, perform a depth-of-cover survey, develop a geographic information system data base and install new testing equiPment at the Cortez pumping station, over and above what the ePS currently requires.
A new line chart band for the display of data such as elevation profiles, direct assessment and close interval survey readings, and drain volume values.
They will also utilize the Close Interval Survey Manager (CISM) to manage and analyze close interval survey data.
JW's Pipeline Integrity Services offer the following services to the pipeline industry: Training, Field Supervision and Inspection, Current Attenuation (such as PCM), Alternating Current Voltage Gradient (ACVG), Close Interval Survey (CIS), Direct Current Voltage Gradient (DCVG), Short Locating, Stray Current Mapping, Locating with sub-meter GPS, and Electronic Depths of Cover and data analysis for all services.
Close interval survey, for example, is an excellent tool for locating where cathodic protection levels are low, whereas an electromagnetic survey may produce a DC current profile to show locations of current loss.
Operators use a structured method of integrating the data from inspections, such as Close Interval Survey and Direct Current Voltage Gradient, with the physical characteristics and operating history of the pipeline.
[Figure 2 LLUSTRATION OMITTED] If a close interval survey is to be conducted on a section of pipeline in a joint corridor, the presence of AC voltage on the pipeline should be monitored by recording AC measurements at specified intervals to determine if it is safe to continue.