By Brian Holtsbaum
This e-book offers an in depth step by step strategy for onshore cathodic defense exams together with rectifier inspections and troubleshooting, structure-to-electrolyte (pipe-to-soil) power measurements, direct present size, diagnostic checking out (troubleshooting cathodic security systems), adjustive surveys, commissioning of cathodic defense platforms, shut period strength surveys, DC stray present checking out, electric isolation checks, highway casing isolation checking out, AC unsafe voltages on pipelines, and soil resistivity measurements. every one of those attempt strategies have been ready as modules that may be used self sufficient of one another. The textual content can be specifically invaluable to cathodic defense technicians in supporting with their box checks, to cathodic security technologists or experts within the research of the exams info and for individuals interested by the learning of cathodic defense group of workers.
desk of Contents
1. Rectifier Adjustment, Inspection, and easy Troubleshooting
2. Structure-to-Electrolyte power size
three. Direct present Measurements
four. Diagnostic checking out (Current Requirement)
five. Adjustive Survey
6. Commissioning Survey
7. shut period power Survey
eight. Direct present Stray present Interference
nine. electric Isolation
10. street and Railroad Cased Crossings (Basic)
eleven. Alternating present Voltage checking out
12. Soil Resistivity dimension
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Extra resources for Cathodic Protection Survey Procedures
Adjust taps if the DC current is too high. 2 Test the rectifying elements for a shorted diode and replace, as required. 3 Inspect for signs of arcing to the rectifier case. Determine cause and repair, as necessary. 1 The DC output of most rectifiers is monitored by a DC voltmeter and a DC ammeter with either an internal or external shunt. 2 Faulty meters can give a false indication of trouble. For example, a failed ammeter with accompanying DC voltage suggests that there is trouble in the external circuit, while the trouble is in the ammeter itself.
Do not assume that the most negative reading is always the ON reading because it may not be. It is imperative that reverse changes in potential be seen and recorded. 5 ON/OFF structure-to-electrolytepotentials are typically conducted before a depolarization test is completed as a baseline in addition to comparing the OFF values to the native potentials. 6 s after interruption. 3). 8 If using an analog voltmeter, a noticeable reduction in the speed of the needle’s descent can be seen, at which point the reading is taken as the OFF value.
2 If the fault appears to be in a shallow anode bed that still has some current output, conduct a close interval potential survey over the anode area. Operating anodes will be depicted by the increase in the voltage gradient (IR drop) centered through each anode. There will be minimal change in potential through the depleted anode section(s). 34 CATHODIC PROTECTION PROCEDURE NO. 1 Measure the AC voltage and compare with the rectifier rating. If it is a dual-AC input rectifier, confirm that the taps are set correctly for the AC supply.