Standard pipe-to-soil voltage measurement at a test post, with the Cathodic Protection installation switched on.
INSTRUMENTATION. AND EQUIPMENT
- High resistance voltmeter. Link to details of instrumentation
- Cu/CuSO4 electrode.
- Two lengths of flexible cable, each fitted with a voltmeter connector and a crocadile clip.
- Field notes
- Report forms
1.1 Place the electrode firmly in the standard ground position.
1.2 Connect the electrode to the positive pole of the voltmeter.
1.3. Connect the negative pole of the voltmeter to the pipeline test point connection.
1.4. Record the voltage reading on the record sheet under the heading 'P'.
This is the standard type of measurement that has been recorded over many years by most operating organisations. It has been given the name of 'Pipe to soil potential' but this is incorrect as the measurement is a voltage, taken using a voltmeter or a data-logger.
The reading will indicate that the CP is switched on and connected in the correct polarity.
Such records can be related to corrected readings where the errors have been identified by using other procedures.
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