The production of water supply coated composite steel pipes should meet the industry standards and comply with relevant national and industry laws and regulations on environmental protection, safety and health. The surface of the water supply coated composite steel pipe should be flat, smooth, and free from obvious scratches, dents, bubbles, and other defects. The coating should be uniform, without peeling, cracks, pinholes, and have a consistent color. The size of water supply coated plastic composite steel pipes should meet the design requirements