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API 5L Steel Pipe Specification (Latest 45th Edition Update)15/4/2019
Requirements for the manufacture of two product specification level (PSL1 and PSL2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries. This standard is not applicable to cast pipe.

In a word, API 5L pipe is the carbon steel pipe applied to the oil and gas transmission system. Meanwhile,Plastic Fishing Net Supplier other fluids like steam, water, slurry also could adopt the API 5L standard for the transmission purposes.On the other hand, seamless manufacturing type usually for the small diameters pipe, (the pipe diameter is less than 150 mm or 6 inch, the seamless steel pipe is more applied than steel pipe in welded.)

For your info, there are also big diameters seamless pipe. By hot rolled manufacturing process we could get seamless pipe diameters at most 20 inch (508 mm). But if you need the seamless pipe more than 20, we can get it through hot expanding processes, maximum diameters to 40 inch 1016 mm.Besides Seamless and ERW, SAW manufacturing technologies, in the earliest years the API 5L steel pipe also could be made in furnace lap-welded (deleted in API 5L in 1962).

As the development of pipeline steel plate making technology, pipe forming and welding technology also has been much improved, so a lot of ERW pipe and SAW pipe used in the pipeline constructions. Specially for the big diameter steel pipe, SAW pipe gains a great advantage. With less raw material cost, simplified and uniform production procedures, welded steel pipe has taken the first place in oil and gas line pipe industries.API 5L steel line pipe adopts different steel grades.Some manufacturers are capable of manufacturing steel grade up to X100 and X120. As the steel line pipe grades higher, more strictly control on the carbon equivalent control, and higher mechanical strength performances.

More over, for the same grade API 5L pipe, seamless and welded chemical elements content is different, which welded pipe is required more strictly and lower on Carbon and Sulfur.

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