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How to Improve Accuracy of Anode Output Estimated From Field Gradient Measurements

Survey of sacrificial anodes mounted on complex structures sometimes includes field gradient measurements for example made by stabbing an anode using a twin-cell probe.Typical practise is for survey companies to convert the twin-measurements of potential into an estimated anode output but there is a risk that estimates may be inaccurate if the method used does not appropriately take into account factors such as:The stab is made away from the middle of the anodeThe probe is not oriented perpendicular to the surface of the anodeThe structure around the anode leads to distortion of the electric fields for example because there is a coating defect to one side of the anode or the structure is not symmetric around the anodeThrough the use of examples this paper investigates the effect of such factors on measured field gradient. It goes on to show how field gradient measurements made with probe orientations which do not correspond to electric-field flux-lines or which are not central on an anode can nevertheless be used to estimate anode output.The paper seeks to provide reference material which can be used to simplify estimation of anode output from measured field gradients.

Product Number: 51319-12910-SG
Author: Tim Froome
Publication Date: 2019
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