Practical Guidelines for the Inspection and Repair of Hot Dip Galvanized Coatings

Information courtesy of: HOT DIP GALVANIZERS ASSOCIATION SOUTHERN AFRICA

Test Sampling

To properly evaluate hot dip galvanized coatings, it is essential that random selected specimens be representative of the inspection lot. An inspection lot is a single order or single delivery load. For products complying with ISO 1461 the minimum number of articles from each inspection lot that forms the control sample shall be in accordance with table 1.

Typically, the test unit for compliance with EN 10240 shall be, for each size, one tube per first 500 tubes and subsequently one per 1000 tubes for outside diameters greater than 21.3mm and one per 2000 tubes for smaller diameters.

Unless otherwise specified by the purchaser, an acceptance inspection should be arranged and undertaken before the products leave the premises of the galvanizer.