Regarding the thickness of the galvanizing layer on hot-dip galvanized steel pipes
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Hello, colleagues and friends! The batch of hot-dip galvanized steel pipes purchased by the unit comes with a product qualification certificate as well as a test report from the Provincial Steel Product Quality Supervision and Inspection Center. This report includes three tests related to the galvanized layer: the weight of the galvanized layer, its uniformity, and its adhesion strength. Galvanized pipe DN80, T=3.2. The total thickness of the galvanizing layer on both the inner and outer surfaces should be no less than 300 g/m2. Which **standard** does this figure come from? Is it reliable?
The key is to have testing methods, or to find a third party to conduct the testing and issue a certificate. Generally, this test report is reliable. It is recommended that, if the quantity is large, it is best to engage a third party for testing, or to obtain warranty documents for certain aspects. It depends on what the contract stipulates. It is usually reliable.
Thank you; these materials are only used to protect the lightning protection grounding grid flat steel, and the quantity is not large. I found relevant information in the **recommendatory standards yesterday; the report issued by the Quality Supervision Bureau meets the requirements of those standards**.
GB3091 specifies 300 or 500; for 500, the thickness is 0.07 mm