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LSAW Steel Pipe (Longitudinal Submerged Arc Welded Pipe), DSAW Pipe, SAWL Pipe

LSAW (Longitudinal double submerge arc welding) steel pipe is a type of welded pipe. It is known for its straight seam.

These pipes are made by bending steel sheets into a cylinder shape. They are then welded along the length of the pipe.

They’re used in:

  • Infrastructure development
  • Construction sites
  • Oil and gas transportation
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What is LSAW Pipe?

LSAW (SAWL) steel pipes are made by welding hot-rolled steel plates. This is done using the JCOE or UOE forming process.

LSAW (Longitudinal double submerge arc welding) is a welding method used to join different pieces of metal. LSAW pipes differ from pipes made using other SAW processes. They use both AC and DC currents. 

The DC voltage ensures that the current flows in a closed path and the resultant effect is zero. This doesn’t let the current come in contact with metal. As a result, the quality of pipes remains unmatched. These pipes are also used in construction sites.

What is LSAW Pipe

Specifications of LSAW Steel Pipe

LSAW Pipe-lsaw steel pipe Specifications-UNIASEN
  • Name: LSAW Steel Pipe (Longitudinally Submerged Arc Welding)
  • Standard: API 5L, ASTM A53, EN10025, DIN17100, JIS G3101, ASTM A252, AWWA C200-97
  • Grade: GR.A, GR.B, GR.1, GR.2, GR.3, X42, X46, X52, X56, X60, X70, Q235, Q345, S355J0H, S355JR
  • Sizes:
    Out diameter: 8″ ~ 64″( 219.1mm ~1626mm, DN200~ DN1600)
    Thickness: 6mm ~ 75mm(SCH 5S~SCH XXS)
  • Surface Coating: Varnishing, Oiling, Hot Dip Galvanizing (FBE, 2PP, 3PP, 2PE, 3PE)
  • End Type: Plain, Bevelled, Threaded, Grooved
  • Joint Method: Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
  • Pipe Machining: Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

LSAW steel pipe Advantages

lsaw pipe manufacturer-LSAW steel pipe features

Large Diameter

Our LSAW steel pipes are known for their capability to be manufactured in large diameters. These pipes are good for moving a lot of liquids or gases in certain situations.

Thick Wall Thickness

UNIASEN LSAW steel pipes are available with thick wall thickness. They are suitable for high-pressure applications, such as in the oil and gas industry.

LSAW steel pipe features


LSAW pipes are a good choice for projects that need to transport fluids or gases over long distances. This is because they can be made in long lengths, which saves money.

LSAW Pipe manufacturer and supplier-LSAW steel pipe features

Resistant to Corrosion

LSAW steel pipes can resist corrosion well, which makes them suitable for tough environments.

UOE LSAW Pipe Forming Process

The UOE method is used to produce dimensionally precise LSAW pipes.

The first step is to prepare steel plates and shape them into ‘U’ shapes using a U-press or cold rolling.

The next step is to convert U-shaped plates into O-shape by curving the open ends inward.

These O-shaped plates are then welded longitudinally to create a smooth seam.

After that, hydraulic or mechanical methods are used to expand the O-shaped pipes. This method is quite effective and has been in use for a long time.

LSAW UOE Pipe manufacturing process

JCOE LSAW Pipe Forming Process

The JCOE pipe is a special kind of pipe. It is made by connecting two pipes into a J shape. Then, they are bent into a C-shape and an O-shape. Finally, the edges are arc welded together.

The JCOE pipe has the same function as ordinary pipes. But, it has better quality, is easier to process, and is easier to transport.

This creates a square or rectangular channel. It faces the interior and holds the wrapped core material. The channel also has a curved surface that faces the exterior.

The body is expanded by high-pressure air cylinders to control dimensions.

LSAW JCOE Pipe manufacturing process

China LSAW Pipe Production Line

The application of LSAW Pipe

LSAW pipe is widely used in oil and gas pipelines. They need pipes with very large diameters, thick walls, and high strength. This is to move hydrocarbons over long distances. In the meantime, LSAW pipe is highly recommended for many uses. These include: weight bearing piles, combination wall piles, water treatment, the thermal sector, bridge construction, and others. Specific applications in the following industries:

Oil and Gas Transportation

LSAW pipes are widely used in oil fields, natural gas production and transmission pipeline systems.

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Hydraulic Conveyance

LSAW pipes can be used in large-scale water conservancy projects, such as reservoirs, canals and urban water supply systems.

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Bridge Construction

Including bridge support structures, bridge piers and bridge decks.

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Building Structures

Such as large buildings, commercial centers and industrial facilities. The high strength and durability of LSAW pipes are suitable for building structures.

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LSAW Steel Pipe VS SSAW Steel Pipe

Both types of pipes use the SAW technique. But their manufacturing methods are different.

SSAW forms the plates into a spiral and then welds along its length to make the seam.

While LSAW bends steel plates into a cylindrical shape and then welds it.

LSAW pipes are better for construction sites because they are stiff.

In contrast, SSAW pipes are flexible due to their spiral shape.

However, both types of pipes have their respective advantages and disadvantages.

LSAW Steel Pipe

  • LSAW pipes are quite expensive
  • Welded in longitudinal direction
  • Not much efficient
  • Outer diameter ranges between 16 Inch and 60 Inch
  • Mainly used for medium/high pressure applications
  • Thickness tolerance is moderately precise

SSAW Steel Pipe

  • SSAW pipes are cheaper compared to LSAW pipes
  • Welded in spiral direction
  • Highly efficient
  • Outer diameter ranges between 20 Inch and 100 Inch
  • Mainly used at construction sites
  • Thickness tolerance is moderately precise
  • Geometry accuracy is low

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