How Does Lsaw Steel Pipe Work?

What is the LSAW steel pipe?

LSAW (Longitudinal submerged arc welded steel pipe) steel pipe is made of a small leaf plate as raw material, and the steel plate is produced by double-sided submerged arc welding and flaring under the pressure (volume) of the mold or forming machine. The finished product has a wide range of specifications, good weld toughness, ductility, uniformity, and compactness, and has the advantages of large diameter, wall thickness, high-pressure resistance, and low-temperature corrosion resistance. High-toughness, high-quality long-distance oil, and gas pipelines are mostly large-diameter thick-walled LSAW.

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Application of LSAW steel pipes

LSAW steel pipes are used in onshore & offshore oil and gas pipelines, where require careful services, high performance, and tight tolerances. LSAW pipelines are also used to transport flammable and non-flammable liquids and used as structural components in construction projects.

Specification of JS LSAW steel pipes

The LSAW pipe (Longitudinal Submerged Arc Welded Pipe) is made by JCOE and has a straight weld with an outer diameter of usually 323mm to mm. When the outer diameter is greater than 914.4mm, two straight welds are allowed. LSAW pipes are used to transport low-pressure liquid media or high-pressure oil or natural gas, and can also be widely used in structural supports or foundations.
The advantage of the LSAW type is that they can produce thicker pipe wall thickness, up to 120mm.
Specification:
OD: 219mm-mm
Wall thickness: 5.0mm-50mm
Length of each pipe: 6m-18m
Ends treatment: square head (straight cut, saw cut, and torch cut). Or chamfer for welding, chamfering.
Surface treatment: oiled, hot-dip galvanized, electro-galvanized, black, nude, varnish coating/anti-rust oil, protective coating
Packing: Both ends are equipped with plastic plugs, the largest hexagonal bundle is 2,000kg, with several steel bands, each bundle has two labels, wrapped in waterproof paper, PVC sleeve, sackcloth, with several steel bands, plastic cap.

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General Test

1) chemical composition analysis
2) mechanical properties: ultimate tensile strength, yield
Strength, elongation
3) technical performance: flatness test, bending test, blow molding test, impact test
4) appearance and size inspection
5) hydrostatic pressure test
6) X-ray test

The production process of large diameter LSAW steel pipe

Rolling machine→Uncoiler→Unwinder→Retripper leveling machine→Vertical roll centering→Shear butt welding→Strip position control (double-head vertical roller)→Disc shearing→Strip position control (Double-head vertical roller )→ Edge Milling Machine (Fine Milling X Groove)→ Double End Roller→ Strip Surface Cleaning of Strips→ Double End Roller→ Conveyor→ Strip Feeding and Strip Position Control→ Molding Machine→ Inner Welding→ Outside Welding → steel pipe righting device → plasma cutting → straight seam steel pipe outlet

Main features of LSAW steel pipe:

LSAW and SSAW are variants of SAW (submerged arc welded) pipes. The difference between them is the way they are welded. In LSAW pipes, the welding is longitudinal, which means that steel (hot rolled coil plate) is rolled into a pipe and the seam is welded longitudinally. In the SSAW type, steel coils are welded spirally, like a helix, so that the coil (strip) assumes the shape of a pipe. SAW pipes are used mainly in oil and gas transportation. On the other hand, seamless (non-welded) pipes are mainly application in oil and gas exploration projects.

An LSAW pipe (“submerged arc welding”) is manufactured by cutting, bending, and welding steel plates (JCOE process). The two main types of LSAW pipes are the longitudinal (with a single or double straight seam weld, DSAW) and the spiral type (called, HSAW, SSAW or SAWL pipe).

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Spiral steel pipes (SSAW Pipe) and straight seam steel pipes are currently widely used in water pipelines, construction and other industries, but there is a big difference between the two.

1. Different pressure-bearing capacity
The strength of spiral steel pipes is generally higher than that of straight seam steel pipes. The main production process is submerged arc welding. Spiral steel pipes can use blanks of the same width to produce steel pipes with different pipe diameters, and can also use narrower blanks to produce steel pipes with larger pipe diameters.

2. Different specifications
The specifications of spiral steel pipes are generally above 219mm, and most of them are of large diameter. The specifications of straight seam steel pipes are mostly of small diameter, but some manufacturers also have many large diameters.

3. Different prices
Spiral steel pipes are mostly settled by measuring rulers, and the price of straight seam steel pipes is mostly settled by weighing, but the price of spiral steel pipe is about 300 yuan/ton cheaper than that of straight seam steel pipe.