Coated Steel Pipe

Various kinds of protective coatings and linings are available for ensuring long-term durable service of the pipelines. Polyethylene, polyurethane, liquid epoxy, and fusion-bonded epoxy which meet AWWA or other national standard are typical coating and lining system. Many kinds of joint are applicable for providing long-term watertight operation without maintenance. Both lap-welded slip joint and double welded-butt joint result in strong and permanently tight joint under such severe conditions as earthquake or irregular settlement.

Basically, exterior surface of steel pipe and fitting are coated with polyethylene by powder fusion method. In order to increase mechanical and chemical properties of the coating, a fusion bonded epoxy layer is followed by a modified-polyethylene adhesive layer for 3-layer system which ensure the coated pipelines maintain long-term service by preventing their deterioration and corrosion leaks.

The interior and exterior surfaces of the steel pipes and fittings are coated and lined with 100% solids, rigid polyurethane system which meets AWWA Specification C 222. As this system provides environmental and safety compliance such as volatile organic compound(VOC) content, cost-effectiveness, appearance and high performance, it is regarded as an ideal corrosion protection measurement for many pipeline systems but not limited to potable or sewage water pipeline, sea water system, power plant, marine piling, and infrastructure in harsh, industrial or marine environments.

The liquid epoxy system exhibits excellent corrosion-resistance properties and provides good smoothness to maintain flow capacity for pipes and fittings used for water works and other industry. Recently, epoxy coating materials made from mixture of BPA-free epoxy resins and nano-silver additives are applied to improve safety compliance and performance for water service.

Because of wide range of design, welding and fabrication processes applicable to steel pipe provide a solution to most problems which may be encountered in many kinds of pipe industry. Both interior and exterior surfaces of the fittings are coated and lined with polyethylene, polyurethane, epoxy, and other protective materials in accordance with the requirements called for the standard or customer's specification.