Modification of the WaveForm Analyzer/Pulse Generator System for Close Interval Potential Surveys. Final Report, October 1989-July 1992.

摘要

Cathodic protection is used to control corrosion on buried pipelines. The effectiveness of cathodic protection systems is evaluated through the use of pipe-to-soil potential measurements. These measurements can give misleading information unless the IR-drop error is eliminated from the pipe-to-soil potential. Potential measurements are recorded annually along pipelines at designated test points. Periodically, close interval pipe-to-soil potential surveys are performed to evaluate the level of corrosion protection between test points. Close interval data is generally collected at 2.5 foot intervals along the pipeline. Under Phase V of the research effort, a WaveForm Analyzer/Pulse Generator (WFA/PG) System was demonstrated to be an accurate and simple to use system for measuring IR-drop free potentials at test stations. The report documents the continuation of the Phase V work to modify the technology for use in close interval potential surveys. The project established that the modified WFA/PG technology can be used for performing CIS/WFA surveys along gas pipelines. The technique eliminates the need for synchronous current interruption and therefore prevents errors caused by drifting timing cycles and spikes in the potential wave form.