Which series of pipes are galvanized pipes?
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Pipes are divided into three series: Ia, Ib, and II. As for the conduit used for instruments, we generally refer to it as DN15, or 1/2 inch, without specifying which series it belongs to
Galvanized pipes are not classified into series such as Ia, Ib, II. Galvanized pipes are classified according to the type of pipe; they refer primarily to steel pipes that have been treated with zinc plating on top of ordinary steel pipes. Galvanizing is used to prevent oxidation of the inner wall of steel pipes, thereby improving their wear resistance and corrosion resistance. As for the conduit for instruments you mentioned, it is determined by the purpose of the pipe, being mainly used for laying wires and cables. The specifications for such pipes are generally indicated in DN or inches, such as DN15, 1/2 inch, etc., but there is no specific series classification. As mentioned above, there are many criteria for classifying pipes, and whether a pipe is assigned to a certain series depends mainly on the criteria used for classification. Not all types or applications of pipes have a clear classification system. .
The most cost-effective and practical option is likely the welded steel pipe for cable sleeves specified in YB_T 5305-2020. Secondly, GB13793 and GB8162 should also work.