Standard

AS 3894.1

Published

Note: This standard has a new edition: AS 3894.1

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Abstract

This document provides a practical test method for the on-site determination of the presence of voids, pinholes, holidays, cracks and other discontinuities that penetrate to the substrate, in a non-conductive, protective coating of at least 150 μm thickness (see Note) on a conductive substrate, using the high voltage or “brush” method.  NOTE Where coatings are less than 150 μm thick, an alternative method such as the low voltage wet sponge method (refer to AS 3894.2) should be used.  This document is applicable to site testing of coated metal items of equipment or structures which may be subjected to long-term burial or immersion, such as structural steel, pipelines, storage vessels, bridges and mobile/transportable containers. The method is confined to testing instruments that can provide a minimum voltage of 500 V. This document is not intended to apply to coating types incorporating pigments that conduct an electric current, such as zinc dust and aluminium flakes.  The voltages recommended in this document are intended to be applied to a dry surface under conditions of normal atmospheric pressure and temperature.

Document information

  • Standard from SA_AC
  • Published:
  • Version: 0
  • Document type: IS