Gas Pipelines

Longitudinal Welded Pipe for Natural Gas Transmission

    Outside Diameter: Ф406mm - 1422mm

    Wall Thickness: 8mm - 60mm 

    Length: 3m - 12m

Under normal circumstances, longitudinal welded pipes are used for machine structural purpose. As an ISO 9001:2008 company, we guarantee not only quality but also great service.


Specifications of Longitudinal Welded Pipe:

1) Outside Diameter: Ф15 - 200mm

2) Wall Thickness: 1mm - 18mm 

3) Length: 3m - 12m

4) Steel Grade: Q195, Q235

5) Standard: SY/T5037-2000, GB/T9711.1-97, API Spec 5L

Production Method:

UOE is a method used for production of longitudinally welded large diameter pipes. Longitudinal edges of steel plates are first beveled using carbide milling equipment. Beveled plates are then formed into a U shape using a U-press and subsequently into an O shape using an O-press.

Longitudinal edges of the plates are then tack welded followed by internal and external welds.

Pipes manufactured by this process are subject to expanding in order to relieve internal stresses and obtain a perfect dimensional tolerance.

After the pipes are conveyed to cold expansion, hydrostatic testing and NDT inspection, the pipes will be subject to final inspection for compliance to customer requirements.

Starting from the incoming control stage and lasting until the final inspection stage, the entire process is monitored and supported by computerized systems. Traceability is achieved by input controls and barcodes throughout entire production lines.

Packaging of Longitudinal Welded Pipe

Shanghai Metal Corporation Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.

1) Shanghai Metal Standard

2) Customization 

Applications of Longitudinal Welded Pipe:

Longitudinally welded steel pipes are used in onshore and offshore oil and gas pipelines requiring critical service, high performance, and tight tolerances. LSAW pipes are also used in conveyance of flammable & nonflammable liquids, and as structural members in construction projects.

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