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LSAW Pipe

LSAW Pipe

Longitudinal Submerged Arc Welded (LSAW) pipe is one of the most reliable and widely used welded pipe types in industries that require large-diameter and high-strength solutions. Known for its superior toughness, dimensional accuracy, and excellent pressure-bearing capacity, LSAW steel pipe is the preferred choice for oil & gas pipelines, water transmission, structural projects, and offshore engineering.

At Emirerri Steel, we are leading LSAW pipe manufacturers, supplying high-quality LSAW welded steel pipes that conform to international standards. With a strong focus on precision manufacturing and strict quality control, we ensure our LSAW pipes deliver durability and performance across critical applications.

LSAW (Longitudinal Submerged Arc Welded) Pipe
LSAW (Longitudinal Submerged Arc Welded) Pipe

What is an LSAW Pipe?

An LSAW pipe is manufactured by bending and welding steel plates with a longitudinal seam using the submerged arc welding (SAW) process. Unlike spiral welded pipes, the welding seam of LSAW welded pipes runs along the pipe length, giving them enhanced mechanical properties and uniformity.

Key Characteristics of LSAW Steel Pipe:

  • Large diameter availability (up to 56 inches)

  • High wall thickness for strength and pressure resistance

  • Smooth internal and external weld seam finish

  • Superior dimensional accuracy and roundness

  • Excellent toughness and durability

Manufacturing Process of LSAW Welded Pipe

The production of LSAW welded steel pipe involves several precise steps to achieve high-quality results:

  1. Plate Selection – High-quality steel plates are selected based on required grades and standards.

  2. Edge Milling – The edges of the plates are beveled for accurate welding.

  3. Forming – Plates are shaped into cylinders using the UOE (U-ing, O-ing, and Expansion) or JCOE (J-ing, C-ing, O-ing, and Expansion) forming process.

  4. Internal & External Welding – Both inside and outside seams are welded using submerged arc welding (SAW) for strength.

  5. Heat Treatment – Pipes are heat-treated to improve toughness and remove residual stresses.

  6. Sizing & Expansion – Pipes are sized and expanded to meet dimensional tolerances.

  7. Testing & Inspection – Hydrostatic, ultrasonic, X-ray, and mechanical tests ensure compliance with ASTM, API, EN, and ISO standards.

Types of LSAW Steel Pipes

Based on application and standards, LSAW welded steel pipes are available in:

  1. Carbon Steel LSAW Pipe – Commonly used in oil & gas and structural projects.

  2. Stainless Steel LSAW Pipe – Corrosion-resistant for chemical and marine applications.

  3. API LSAW Pipe – Manufactured as per API 5L standards for oil & gas transmission.

  4. Structural LSAW Pipe – Used in construction, piling, and offshore projects.

Applications of LSAW Pipe

LSAW welded pipes are used across multiple industries due to their strength and durability:

  • Oil & Gas Industry – Long-distance transmission pipelines for crude oil and natural gas.

  • Water Supply Projects – Transporting water in large-diameter pipelines.

  • Offshore Engineering – Subsea pipelines, platforms, and marine structures.

  • Construction & Infrastructure – Bridges, piling, and structural frameworks.

  • Power Plants – Boiler tubes and high-temperature applications.

Advantages of LSAW Welded Steel Pipe

  • High Strength & Durability – Capable of withstanding high pressures and heavy loads.

  • Large Diameter Capability – Suitable for wide pipelines and infrastructure projects.

  • Uniform Weld Seam – Strong and smooth seam improves performance and safety.

  • Versatility – Applicable in both onshore and offshore projects.

  • Compliance with Global Standards – Manufactured as per API, ASTM, EN, and ISO requirements.

Standards & Specifications

We supply LSAW steel pipes in compliance with:

  • API 5L – PSL1 & PSL2 for oil & gas pipelines

  • ASTM / ASME – A252, A671, A672

  • EN / ISO – EN 10217, EN 10219

  • DIN – DIN 17172, DIN 1629

Why Choose Emirerri Steel as Your LSAW Pipe Manufacturer?

As trusted LSAW pipe manufacturers, we ensure:

  • Extensive Range – LSAW welded pipes in carbon, stainless, and alloy steel grades.

  • Stringent Quality Control – Ultrasonic, radiographic, and hydrostatic testing for every pipe.

  • Customization – Pipes available in various diameters, lengths, coatings, and grades.

  • Global Supply – Serving industries worldwide with timely delivery.

  • Competitive Pricing – High-quality products at cost-effective rates.

  • Proven Track Record – Trusted by oil & gas, infrastructure, and marine sectors globally.

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