PROCEDURE 1a

Standard pipe-to-soil voltage measurement at a test post, with the Cathodic Protection installation switched on.

INSTRUMENTATION. AND EQUIPMENT

  1. High resistance voltmeter.
  2. Cu/CuSO4 electrode.(a copper rod will do in the first instance)
  3. Two lengths of flexible cable, each fitted with a voltmeter connector and a crocodile clip.
  4. Field notes
  5. Report forms


METHOD



1.1 Place the electrode (copper rod) 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'.

Notes.



This is the standard type of measurement that has been recorded over many years by most pipeline operating organisations.

The reading will indicate that the CP is functioning and connected in the correct polarity.

Such records can be related to corrected readings where the errors have been identified using other procedures.