JIANGSU LIANZHONG METAL PRODUCTS (GROUP) CO., LTD
JIANGSU LIANZHONG METAL PRODUCTS (GROUP) CO., LTD
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| Appearance requirements for plastic-coated composite steel pipes 1. The coating layer should be smooth and flat, free from scratches, cracks, pinholes and adhesion of foreign matter and other defects. 2. The outer coating of the steel pipe should be red (fire-fighting), black or gray (water delivery). 3. There should be a clear and durable mark on the coated steel pipe, and the content of the mark should at least include: product model, base pipe specification and wall thickness, implementation standard, manufacturer's name or trademark, production date or batch number, etc. |
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