LSAW Pipeline Longitudinal Submerged Arc Welded Steel Pipe

Brief version

Longitudinal Submerged Arc Welded (LSAW) pipes are the go-to solution for long-distance oil & gas transport, offshore energy projects and industrial fluid conveyance. Made from premium low-alloy and carbon steels that meet international standards, they use continuous longitudinal welds to eliminate circumferential stress points, delivering superior resistance to internal pressure and external impacts.

Available with customizable specs: outer diameter 457.2–1422.4mm, wall thickness 8–50mm, plus tailored surface treatments like 3PE/3LPE and epoxy powder coatings for harsh marine or desert environments. We offer material selection, end beveling and flange connection services, with production adhering to industry standards. Their modular design streamlines transportation and installation, fitting construction codes worldwide and cutting long-term maintenance costs.

Detailed English version

LSAW Pipeline Full Introduction

Longitudinal Submerged Arc Welded (LSAW) pipes are engineered to meet the most demanding requirements of long-distance oil and gas transmission, offshore energy development and industrial fluid transport. Their core advantage lies in exceptional structural strength and pressure-bearing capacity, making them the preferred choice for critical pipeline projects worldwide.

Crafted from high-quality low-alloy structural steel and carbon steel conforming to international standards, LSAW pipes utilize advanced submerged arc welding technology. The continuous longitudinal welds feature uniform thickness and full fusion, eliminating the stress concentration issues common in circumferential weld designs. This results in superior resistance to internal pressure and external impacts, allowing the pipes to withstand harsh conditions including high pressure, low temperature and corrosive media while minimizing leakage risks.

From plate cutting and forming to welding and post-weld heat treatment, every production step is controlled to maintain strict dimensional accuracy and surface quality. Key dimensions such as outer diameter, wall thickness and ovality are held to tight tolerances. Surface anti-corrosion treatments include external 3PE/3LPE coatings and internal epoxy powder coatings, which boast excellent adhesion, abrasion resistance and chemical stability. These coatings effectively isolate the pipe from corrosive media like soil, water and hydrocarbons, extending service life even in extreme environments such as oceans, deserts and permafrost regions.

Our LSAW pipes offer comprehensive customization options to suit diverse project needs:

Specifications: Outer diameter ranges from 457.2mm to 1422.4mm, with wall thickness adjustable from 8mm to 50mm based on pressure ratings and application scenarios.

Materials: We provide ordinary carbon steel, special steel and low-alloy steel grades tailored to specific project requirements.

Processing: End beveling, threading and flange connection services are available to simplify on-site installation and improve construction efficiency.

Produced in accordance with strict industry standards, LSAW pipes feature high structural stability and long-term corrosion resistance, significantly reducing maintenance needs over their service life. Their standardized modular design supports efficient transportation and installation, compatible with construction specifications across different countries. Whether for segmented laying of long-distance land pipelines or subsea docking of offshore platform pipelines, the unified interface design cuts on-site labor and time costs, accelerating project progress.