Specification for Hot Dip Galvanizing - Highland

1 Specification for Hot Dip Galvanizing The information below is the coating Specification for Hot Dip Galvanizing available from Highland Colour Coaters & Highland Galvanizers. Hot dip Galvanizing EN ISO 1461 Standard Hot dip Galvanizing EN ISO 1461 Marine 140 microns Hot dip Galvanizing is a proven coating system providing corrosion protection for steel and is defined by the standard EN ISO 1461 Hot dip galvanized coatings on iron and steel articles specifications and test methods This covers the cleaning and pre-treatment of the steel as well as the actual Galvanizing process.

2 For marine environments a higher coating thickness can be achieved by shot blasting the surface prior to Galvanizing . Technical applicator requirements The following conditions are necessary for hot dip Galvanizing to be applied effectively and efficiently, all of which are met by Highland Galvanizers and Highland Colour Coaters. The hot dip Galvanizing should be applied in accordance with ISO 1461 The process should be carried out under a robust quality management system which is audited annually to comply with BS EN ISO 9001:2008 or equal Components should be labelled or identifiable throughout the process ensuring traceability The components should be inspected after Galvanizing to ensure minimum thickness levels have been achieved and any surface defects have been addressed.

3 This includes the touching up of allowable bare patches using the procedure detailed in ISO 1461 Materials should be suitably packaged prior to despatch The galvanizer should be a member of the Galvanizers Association. This enables the galvanizer to access independent technical advice that can be utilised by the specifier if any issues arise with the coating Erection and ongoing care Care must be taken during handling and installation to ensure the coating is protected from damage Materials that are being stored on site should be adequately protected from site operations Stacked, galvanized material that is to be stored outside will risk the formation of white rust.

4 This happens when 2 galvanized surfaces are touching and water is allowed to sit between them. If the material is to be stored for any length of time then it should either be stored inside or adequate spacers should be placed between galvanized layers. Covering Galvanizing can contribute to white rust as the material is more likely to be at risk of sweating. Hot dip Galvanizing attributes The coating is applied to all surfaces, both internally as well as externally Superior corrosion protection for exposed or external steel. Up to 150 years lifespan with no major maintenance Galvanizing is a non-permeable coating that has a higher hardness rating than steel Sacrificial protection built in to coating through electrolytic/cathodic protection Superior edge protection compared to paint systems Factory controlled process producing a repeatable high quality finish Allows quicker and easier site erection reducing time on site and site congestion Onsite welding can be accommodated with the use of the approved touch up procedure detailed in ISO 1461 Capacity Elgin bath size x x

5 With a maximum double dip length of 14m Cumbernauld bath size 7m x x 3m with a maximum double dip length of Due to heat expansion the width of an item should be no more than Both plants can handle components up to 4 tonnes in weight. No pre-treatment is required for a standard coating in line with BS EN 1461:2009. Minimum coating thickness of Galvanizing varies on the steel substrate thickness, with minimum thickness quoted in standard BS EN 1461:2009. Shot blasting can be utilised to provide a thicker galvanized layer (140 microns) for the harshest C5M environments. For a thicker coating we recommend shot blasting to SA Shot blasting may also be utilised to remove paint and heavy rust when refurbishing steel.

6 Materials with moving parts are generally not suitable for the Galvanizing process. Sliding latches and drop bolts should be designed with adequate tolerance built in. Steelwork will require to be adequately vented in order that it can be processed effectively and safely. For further information on this and general design tips for Galvanizing please contact us on the phone numbers below For further information please visit our website at or call 01236 731 444 (Cumbernauld) / 01343 548 855 (Elgin) Updated 11/15