Installation Method of BS1387 British Standard Hot-dip Galvanized Pipe and Welded Pipe

BS1387 British standard hot-dip galvanized steel pipe is a hot-dip galvanized steel pipe which is formed by bending a strip or a coiled plate into a spiral shape and welding the inner and outer joints by double-sided submerged arc automatic welding. It can be widely used for the following reasons. Used in the production of water, electricity, chemical and other industries: 

1) As long as the forming angle is changed, steel pipes of the same width can be used to produce steel pipes of various calibers, which are easy to adjust. 

2) Because the continuous bending is formed, the length of the spiral tube is not limited, and the length can be determined at will. 

3) The weld spiral is evenly distributed on the circumference of the entire spiral tube, so the spiral tube has high dimensional accuracy and strong strength. 

4) It is easy to change the size and is suitable for the production of small batch and multi-species spiral tubes. The weld seam of the hot-dip galvanized steel pipe is longer than the weld seam of the straight pipe of the same specification, and the pressure of the hot-dip galvanized steel pipe under the same specification wall thickness*. The defect of the weld of the hot-dip galvanized steel pipe is "oblique defect". In the course of use, the principal stress direction of the steel pipe, that is, the length of the equivalent defect in the axial direction of the steel pipe is smaller than that of the straight seam pipe; secondly, since the pipeline steel is a rolled steel plate, the impact toughness has a large anisotropy, and the rolling is smooth. The CVN value of the direction can be three times higher than the CVN value perpendicular to the rolling direction.