High-strength Welded Pipe For Demanding Applications
Dsaw pipe offers high-strength, durable solutions for oil and gas pipelines, water transmission, and structural applications with superior weld quality.
High-strength Welded Pipe For Demanding Applications
Dsaw pipe offers high-strength, durable solutions for oil and gas pipelines, water transmission, and structural applications with superior weld quality.
DSAW Pipe (Double Submerged Arc Welded Pipe) is a high-quality welded steel pipe produced using a double-sided submerged arc welding process, ensuring exceptional strength and durability. Available in Longitudinal Submerged Arc Welded (LSAW) and Spiral Submerged Arc Welded (SSAW) configurations, DSAW pipes are designed for high-pressure applications in oil and gas pipelines, water transmission, and structural projects, adhering to standards like API 5L, ASTM A252, and ASME B36.10.
The manufacturing process involves forming steel plates or coils into cylindrical shapes, with V-shaped grooves prepared on both interior and exterior surfaces for welding. A single pass of submerged arc welding on both sides, protected by flux, ensures 100% weld penetration, creating a robust and reliable bond. DSAW pipes are available in diameters from 4 inches to 167 inches (100 mm to 4267 mm) and wall thicknesses from 3/32 inch to 4 inches (2.1 mm to 100 mm), making them suitable for large-diameter and thick-walled applications.
DSAW pipes undergo stringent quality control, including ultrasonic testing, hydrostatic testing, and non-destructive examinations, to ensure defect-free welds and compliance with industry standards. Protective coatings such as 3LPE, galvanizing, or Fusion Bonded Epoxy (FBE) enhance corrosion-resistant DSAW pipe performance in harsh environments like offshore pipelines or chemical processing plants. Available in lengths up to 155 feet for spiral formats, these pipes are ideal for long-distance pipelines.
Compared to Electric Resistance Welded (ERW) or seamless pipes, DSAW pipes offer superior weld quality and dimensional accuracy, making them ideal for large-diameter, high-pressure applications such as load-bearing piles or combination wall piles. With tensile strengths starting at 415 MPa for API 5L Grade B, they provide excellent mechanical performance. Customizable end finishes (beveled, plain, or threaded) ensure compatibility with complex piping systems.
DSAW pipes address critical challenges like corrosion, high pressure, and structural stress, making them a reliable choice for engineers seeking durable industrial piping solutions for oil and gas, water supply, and construction projects. Their high weld quality and versatility ensure long-term performance in demanding conditions.
Double submerged arc welded (DSAW) spiral steel pipe is favored in industries such as oil and gas, slurry transportation, and urban construction due to its high-pressure capacity, low resistance, low-temperature resistance, corrosion resistance, and ease of installation and maintenance.
Introduced in 1940, double submerged arc welding (DSAW) is a highly efficient welding method distinct from manual welding. It uses a flux system delivered through a funnel to the welding area, protecting the weld with molten flux rather than electrode coating. The continuous wire feed eliminates the need to replace electrodes, ensuring uninterrupted welding.
In DSAW, the arc burns within a cavity formed by the welding wire, base material, and flux, creating stable combustion known as submerged arc welding. Key advantages include:
Modern advancements include double-wire and multi-wire DSAW, further enhancing efficiency for large-scale applications.
Our technical team provides comprehensive solutions for pipeline projects, tailored to meet system and budgetary requirements. In collaboration with partners, we offer integrated services, including:
| Grade | C (% max) | Si (% max) | Mn (% max) | P (% max) | S (% max) |
|---|---|---|---|---|---|
| API 5L Grade B | 0.28 | 0.45 | 1.20 | 0.03 | 0.03 |
| ASTM A252 Grade 2 | 0.26 | - | 1.40 | 0.04 | 0.05 |
| ASTM A671 | 0.24 | 0.13-0.45 | 0.98 | 0.035 | 0.035 |
The chemical composition ensures weldability, strength, and corrosion resistance for DSAW pipe in demanding industrial applications.
| Grade | Tensile Strength (MPa min) | Yield Strength (MPa min) | Elongation (% min) |
|---|---|---|---|
| API 5L Grade B | 415 | 245 | 23 |
| ASTM A252 Grade 2 | 414 | 241 | 25 |
| ASTM A671 | 450 | 240 | 22 |
These properties ensure DSAW pipes deliver robust performance in high-pressure and structural applications.
DSAW Pipes (LSAW and SSAW) offer superior weld quality and large-diameter capabilities compared to other welded pipes like ERW or HFW. Below is a comparison highlighting key differences.
| Feature | DSAW Pipe (LSAW/SSAW) | ERW Pipe | HFW Pipe |
|---|---|---|---|
| Welding Process | Double Submerged Arc Welding (inside and outside) | Electric Resistance Welding | High-Frequency Welding |
| Diameter Range | 4–167 inches | 1/2–24 inches | 1/2–24 inches |
| Wall Thickness | 2.1–100 mm | 1.5–20 mm | 1.5–20 mm |
| Applications | Oil/gas pipelines, water transmission, structural piles | Water, gas, low-pressure systems | Water, oil, low-pressure systems |
| Weld Quality | High (100% penetration) | Moderate | Moderate |
| Cost | Higher (complex process) | Lower | Lower |
Why Choose DSAW Pipes? Their superior weld quality, large diameter range, and high-pressure resistance make DSAW pipes the preferred choice for critical applications compared to ERW or HFW pipes.
Double-sided welding ensures 100% penetration and strength.
Available from 4 to 167 inches for diverse projects.
Enhanced by 3LPE, FBE, or galvanizing coatings.
Ideal for oil, gas, and water pipelines.
Precise sizes for seamless installation.
Meets API 5L, ASTM A252, and ASME B36.10 standards.
DSAW pipes on process
Double-Sided Submerged Arc Welding (DSAW) spiral steel pipes are manufactured from strip steel coils using a precise, multi-step process to ensure strength, durability, and quality for demanding applications.
Spiral steel pipes are formed from strip steel coils, welding wires, and fluxes, which undergo strict physical and chemical testing. The process begins with butt joint welding of strip head and tail using single or double-wire submerged arc welding, followed by automatic repair welding after coiling. The strip is leveled, trimmed, planed, cleaned, and pre-bent before forming, with electric contact pressure gauges ensuring smooth conveying. Roll forming (external or internal control) and weld gap control devices maintain precise pipe diameter, alignment, and weld quality.
Welding is performed using American Lincoln electric welding machines for stable single or double-wire submerged arc welding. Welds are inspected via online continuous ultrasonic testing for 100% coverage, with defects marked and addressed. Pipes are cut into individual pieces using air plasma cutting, followed by first inspection for mechanical properties, chemical composition, weld fusion, and surface quality. Additional manual ultrasonic and X-ray inspections verify defect repairs, and X-ray television or filming checks butt welds and D-shaped joints. Each pipe undergoes a hydrostatic pressure test with radial sealing, and pipe ends are mechanically processed for precise verticality, bevel angle, and edge finish.
This rigorous DSAW process ensures spiral steel pipes meet high standards for applications in oil and gas, construction, and water pipelines, delivering robust performance and reliability.
Explore DSAW pipes with targeted long-tail keywords for specifications, applications, and materials.
Note: DSAW pipes meet international standards, ensuring high performance and reliability. Contact suppliers for detailed specifications.
DSAW Pipes provide robust, high-strength solutions for critical applications across a global scale, serving industries such as oil, gas, filtration, refrigeration, refining, petrochemical, and offshore, ensuring durability and reliability in demanding environments.
Transports crude oil and refined products over long distances.
Supports natural gas transportation in pipelines.
Used in filtration systems for fluid processing.
Facilitates coolant transport in refrigeration systems.
Handles refined products in processing plants.
Transports chemicals in petrochemical facilities.
Supports offshore pipelines and structural applications.
Used in load-bearing and combination wall piles.
Supports bridges and heavy equipment foundations.
Why Choose DSAW Pipes? Their high weld quality, large diameter range, and corrosion resistance make them ideal for critical applications across oil, gas, filtration, refrigeration, refining, petrochemical, offshore, and infrastructure industries.
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