Table of Contents

Abstract

Specifies requirements for the cathodic protection of external surfaces of fixed immersed structures, including offshore platforms, wharves, jetties, pontoons, sewage treatment plants, water treatment plants, lock gates, pump station piles in rivers, weirs, mooring buoys, piling, foundations and water inlet/outlet structures.
RECONFIRMATION NOTICE
Technical Committee MT-014 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 14 July 2016.
The following are represented on Technical Committee MT-014:
Australasian Corrosion Association
Australasian Corrosion Association, NZ Branch
Australian Chamber of Commerce and Industry
Australian Electrolysis Committee
Australian Industry Group
Australian Paint Manufacturers' Federation
Australian Pipelines and Gas Association
AUSTROADS
Bureau of Steel Manufacturers of Australia
CSIRO
Galvanizers Association of Australia
Galvanizing Association of New Zealand
Materials Australia
New Zealand Abrasive Blasting Association
New Zealand Heavy Engineering Research Association
United Water International
Water Services Association of Australia

Scope

This Standard specifies requirements for the cathodic protection of external surfaces of fixed immersed structures, including offshore platforms, wharves, jetties, pontoons, sewage treatment plants, water treatment plants, lock gates, dam gates, pump station piles in rivers, weirs, mooring buoys, piling, foundations and water inlet/outlet structures.
Whilst fixed immersed structures are rarely affected by stray direct traction currents, there are some significant examples where this does occur and where mitigation is required. Examples of affected fixed immersed structures are underwater tunnels and electrically continuous sheet piling along water-ways and harbours.
This Standard does not apply to steel in concrete structures, see AS 2832.5.
The Standard specifically covers the following subjects which relate to cathodic protection:
The design of structures requiring cathodic protection.
Coatings for use on immersed metal structures.
Criteria for the choice of cathodic protection potential.
The design of cathodic protection systems.
The installation of cathodic protection systems.
The control of interference currents on foreign structures.
The cathodic protection of structures subject to stray direct current.
The operation and maintenance of cathodic protection systems.
This Standard employs conventional (positive) current flow, for consistency with accepted practice, and uses the potential sign conventions specified in AS 1852. In order to understand the various electrochemical reactions that occur at electrodes during cathodic protection, it should be recognized that electron flow occurs in the opposite direction to conventional current flow.

Guidance on the general use and design of cathodic protection systems and factors affecting the corrosion of immersed metallic structures are given in Appendix A.
This Standard employs positive current flow. The international convention is that the potential of an electrode is measured with respect to the potential of an electrode situated in the electrolyte. In the absence of cathodic protection, positive current in a corroding system flows through the electrolyte from the more negative to the more positive portion of the circuit. The aim of cathodic protection is to move the potential of the structure in the negative direction so that positive current flows on to it.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 29/07/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 29/07/2016
Pages
ISBN
Committee	MT-014
Supersedes	DR 05048 AS 2832.3-1992