Application status and development trend of domestic and oversea pipe coatings

3LPE coating stands top on the international market. However, as the external coating of pipe, it has minimum thickness requirement, which results in higher costs. In the meantime, the field joint failure brings safe issues to the operation of pipeline. DowChemical uses special polyethylene and polymer adhesive to develop a new type 3LPE coating. It can effectively avoid the adhesive failure problem existed in current 3LPE coating. Canadian Brederoshaw has developed a new type high performance composited coating (HPCC) with 3-layer powder static spraying technique, which eliminates the obvious lamination in the whole coating system. Also, in the field coating for welded joint, a couple of new type coatings materials such as Maxwell anticorrosion material, polymer mesh coating and liquid polyurethane coating have been developed, which are effective to improve the quality in the field coating for welded joint of 3LPE coating to some extent.