Hot dipped galv.seamless steel pipe is a steel pipe coated with a layer of zinc on the surface. The molten metal reacts with the substrate to form an alloy layer, so that the coating and the substrate are firmly bonded, and the thickness of the coating is uniform. It also has good corrosion resistance due to its galvanized coating.

Steel pipesSteel pipes to BS 1387 are normally specified in the nominal bore sizes given in Table 1. Finishes can be black or galvanised, the latter being preferred for corrosion resistance.

MECHANICAL PROPERTIES OF WELDED JOINTSteel pipes used are API 5LX X52 and X60, with 16 inch outer dia. The wall thickness is 0.5 inch for X52 and 0.25 inch for X60. Welding wire used is of 1.2 mm dia., containing REM. Chemical compositions of pipes and the filler wire are listed in attached Table.

Pre-galvanized steel pipe is one of the most common and popular types of pipe today, made of solid steel with an additional zinc coating. The role of the zinc coating is to prevent the steel pipe from rusting and corroding. Since the pre-galvanized steel pipe does not rust or corrode, the pipe will

If a weld is allowed to cool prior to the postweld heat treatment, the rate of uniform cooling must be controlled to prevent a detrimental effect in the piping.Partial heat treatment of a piping assembly that cannot be fitted completely into a furnace is acceptable if there is at least a 300 mm (1 f

Steel pipe is normally used for pipelines operating at a pressure of 100 psig or more. Steel pipe withstands high pressures, is durable, and has a long operating life cycle. Fiberglass, PVC, or high-density polyethylene (HDPE) pipe is used in certain instances for low-pressure gas gathering pipeline