Heavy Wall LSAW Steel Pipe For High Pressure Service

Heavy Wall LSAW Steel Pipe for High Pressure Service are engineered specifically for demanding high-pressure applications. Representing the pinnacle of structural integrity and reliability in the piping industry, these pipes are manufactured using advanced forming technologies such as JCOE or UOE processes, followed by double-sided submerged arc welding. This production method ensures superior weld quality, uniform wall thickness, and exceptional mechanical properties, making them the preferred choice for critical infrastructure projects where safety and longevity are paramount.

The production of Carbon Steel LSAW Pipes involves a rigorous sequence of steps designed to maximize strength and integrity:

‌Plate Preparation:‌ High-quality carbon steel plates undergo ultrasonic testing to detect any internal defects before processing .

‌Forming (JCOE):‌ The steel plate is progressively formed into a "J," then "C," and finally an "O" shape using specialized molding machines. This asymptotic bending method minimizes residual stress and maintains excellent pipe geometry .

‌Pre-Welding:‌ A preliminary weld is applied to hold the shape, often using MAG (Metal Active Gas) welding, ensuring stability before final welding .

‌Submerged Arc Welding:‌ Both the inner and outer seams are welded using tandem multi-wire submerged arc welding. This technique provides deep penetration and superior weld toughness .

‌Mechanical Expansion:‌ The pipe undergoes overall mechanical expansion treatment. This critical step reduces internal stress, prevents stress corrosion cracking, and ensures high dimensional accuracy

‌1. Exceptional Pressure Resistance

Designed to withstand extreme internal pressures, heavy-wall LSAW pipes utilize high-grade carbon and low-alloy steels (such as API 5L X65-X80, ASTM A672, or EN10217 P265GH). The thick wall structure provides robust resistance against burst pressure, ensuring safe transportation of oil, natural gas, and other fluids over long distances.

2. Superior Weld Integrity

The submerged arc welding process creates a smooth, defect-free longitudinal seam. Unlike spiral welded pipes, the straight seam of LSAW pipes offers more predictable stress distribution. Post-weld expansion treatments further relieve internal stresses, enhancing the pipe's resistance to stress corrosion cracking and improving overall dimensional accuracy.

3. Large Diameter and Customizable Specifications

LSAW technology allows for the production of large-diameter pipes (typically ranging from 406mm to over 1800mm) with wall thicknesses extending up to 60mm or more. This flexibility enables engineers to design pipelines that meet specific flow rate and pressure requirements without compromising on structural strength.

4. Excellent Low-Temperature Toughness

Manufactured from high-quality steel plates, these pipes exhibit excellent toughness even in low-temperature environments. This characteristic is crucial for offshore projects and pipelines located in arctic or cold regions, preventing brittle fracture under harsh climatic conditions.

To enhance durability in various environments, Heavy Wall LSAW Steel Pipe for High Pressure Service can be supplied with protective coatings.

Common options include Black painting, Fusion Bonded Epoxy (FBE), 3-layer Polyethylene (3PE), 3-layer Polypropylene (3PP),

coal tar epoxy, and bitumen coating.‌

‌Oil and Gas Transmission:‌ Primary choice for long-distance crude oil, natural gas, and petroleum product pipelines due to high-pressure resistance .

‌Petrochemical Industry:‌ Used for fluid transport in refineries and chemical plants .

‌Water and Sewage Systems:‌ Large-diameter water transmission lines and sewage outfalls .

‌Structural Engineering:‌ Piling for bridges, offshore platforms, and heavy structural supports .

‌Power Generation:‌ Boiler tubes and hydraulic systems in power plants

Heavy Wall LSAW Steel Pipe for High Pressure Service undergoe strict quality control per Standard requirements
* Hydrostatic Pressure Testing
* Non-Destructive Testing (X-Ray, Ultrasonic)

* Chemical composition test
* Mechanical Property Testing
* Dimension & Visual Inspection
* Full Traceability (Mill Test Certificates 3.1 provided)

* Accept third party inspection before shipment

* High quality assured & Fast delivery.
* Rich experiences(23+years) in Technics/Production/Post-sales.
* Technical & full set of documents support (API 5L, ISO, MTC, ITP &MPS .etc)

Kevin

Tianjin shenzhoutong steel pipe co.,ltd

kevin@tjshenzhoutong.com

Mob/whatsapp/wechat +86 15267768016

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