The minimum thickness of steel for pipes the same nominal diameter of the pipe, according to the EVN 10220:1993 or equivalent.All of the steel pipes and spare parts will be lined on the inside by the concrete made from Portland cement contains sulphate and original software, minimum thickness is 300 micro. Inside cover-layer cement slurry, the experience is similar to the mortar layer specified in the malleable cast iron pipe.The black steel pipe welding depends on the specifications of the machine. In all welding positions to paint 1 abrasive material layer to satisfy the above requirements.
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