pipe-to-soil potential

pipe-to-soil potential

[′pīp tə ¦sȯil pə‚ten·chəl]
(electricity)
The voltage potential (emf) generated between a buried pipe and its surrounding soil, the result of electrolytic action and a cause of electrolytic corrosion of the pipe.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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By estimating pipe-to-soil potential along the cased pipeline segment and, possibly corrosion rates on the carrier pipe, CAPCOM can help determine whether the cased pipeline section is adequately protected or not, or whether it is time to conduct preventive maintenance.
CIS, also referred to as Close Interval Potential Survey (CIPS) measures the pipe-to-soil potential at equally spaced intervals directly over the buried pipeline section.
The product is designed to obtain IR-free pipe-to-soil potential measurements along with AC and DC corrosion current densities by integrating with either traditional buried reference cells, single, or dual coupon cathodic protection (CP) test stations.
CIPS, which records the pipe-to-soil potential every 1 to 2 meters, indicates how efficiently the CP system is operating.
Measurement Method Measured CP Status Criteria Parameter (a) -850 mV "ON" P/S * ON (b) -850 mV Polarized P/S OFF (c) 100 mV Polarization P/S OFF (d) 300 mV Polarization Shift P/S ON and OFF (e) Tafel Segment P/S and i (#) ON and OFF (f) Net Protective Current P/S ON and OFF Measurement Method Voltage Where to Measure Criteria Drops Ground level, above (a) -850 mV "ON" Consider pipe, 50-ft to 5-mi intervals (b) -850 mV Polarized Eliminate Same as (a) (c) 100 mV Polarization Eliminate Same as (a) (d) 300 mV Polarization Shift Consider Same as (a) (e) Tafel Segment Eliminate Not generally used (f) Net Protective Current Not Same as (a) Consider Note: * pipe-to-soil potential; (#) current density.
The unit measures rectifier volts and amps, pipe-to-soil potential, additional shunts and more.
The unit is capable of measuring rectifier volts and amps, pipe-to-soil potential, test points, critical bonds and more.
Field technical services include specialized surveys such as soil resistivity, pipe-to-soil potential, close interval coating evaluation (DCVG and ACVG), current requirement and interference tests.
It measures current direction and magnitude (AC and DC current) in the pipeline to supplement and extend the pipe-to-soil potential data already available, and;
Today, multi-purpose, built-for-purpose, all-in-one, pipeline integrity automation, wireless, data communication radios are available that monitor and report all cathodic protection rectifier operations, automate rectifier interruption, monitor rectifier operational status, monitor and report pipe-to-soil potential, pipeline pressure and pipeline pigging operations.
The CP survey consisted of performing the annual pipe-to-soil potential survey oil the original pipeline systems as well as the new pipe installed as part of the expansion project.