Carbon Steel 90° Long Radius Butt Weld Elbows

Carbon Steel 90° Long Radius Butt Weld Elbows

The Industrial Standard for High-Performance Piping

Our Carbon Steel 90° Long Radius (LR) Butt Weld Elbows are the definitive solution for changing the direction of flow in high-pressure and high-temperature piping systems. Manufactured from high-grade carbon steel (ASTM A234 WPB), these fittings are engineered to provide superior structural integrity and leak-proof permanence.

The Long Radius design, featuring a curvature of 1.5 times the nominal pipe size, is the industry standard for general service. It ensures a smooth flow path that minimizes pressure drop and reduces turbulence, making it the preferred choice for oil & gas transmission, power generation, and water treatment infrastructure.

Key Features & Benefits

• Optimized Flow Dynamics: The Long Radius (1.5D) curvature creates a gradual 90-degree turn, significantly reducing friction loss and pressure drop compared to short-radius elbows. This efficiency is critical for high-velocity fluid transport and pump discharge lines.

• Permanent & Leak-Proof Integrity: The butt weld connection fuses the fitting directly to the pipe, creating a continuous metal structure. This eliminates potential leak paths associated with flanges or threads, making it ideal for hazardous, toxic, or expensive fluids.

• High Mechanical Strength: Manufactured from ASTM A234 WPB carbon steel, these elbows offer excellent tensile strength and impact resistance, capable of withstanding heavy loads, vibration, and thermal cycling.

• Cost-Effective Durability: Carbon steel provides the optimal balance of strength and affordability, making it the most economical choice for general-purpose industrial piping that does not require corrosion-resistant alloys.

• Space-Saving Design: Butt weld fittings are compact and lightweight compared to flanged assemblies, reducing the overall weight of the piping rack and simplifying insulation requirements.

Technical Specifications

• Material Grade: ASTM A234 WPB / ASME SA234 WPB (Standard Wrought Carbon Steel)

• Alternative Grades: ASTM A105 (Forged), ASTM A420 WPL6 (Low Temperature)

• Size Range: 1/2" to 72" (DN15 to DN1800)

• Wall Thickness: SCH 10, SCH 20, SCH 30, SCH 40 (STD), SCH 80 (XS), SCH 160, XXS

• Radius: Long Radius (LR) = 1.5 x Nominal Pipe Size (Center-to-Face distance)

• Angle: 90 Degrees

• Connection Type: Butt Weld (Beveled Ends prepared per ASME B16.25)

• Standards:

• Dimensions: ASME B16.9 (Factory-made Wrought Fittings)

• Material: ASTM A234 / ASME SA234

Applications

• Oil & Gas: Transmission pipelines, refinery process piping, and gathering systems.

• Power Generation: High-pressure steam lines, feedwater, and cooling water systems.

• Water & Wastewater: Municipal water distribution, irrigation, and treatment plant piping.

• Chemical & Petrochemical: Transport of non-corrosive chemicals, solvents, and hydrocarbons.

• Construction & HVAC: Structural supports, fire protection systems, and heating ducts.

Manufacturing Process

We utilize advanced forming techniques to ensure the integrity of every elbow:

• Hot Push Forming: The primary method for seamless elbows. A carbon steel pipe billet is heated and pushed over a mandrel to form the 90° bend. This ensures uniform wall thickness and superior grain structure.

• Welded Construction: For large diameter elbows (typically DN700 and above), steel plates are cut and welded (segmented or "shrimp waist") to achieve the required curvature.

• Cold Forming: Used for smaller sizes to maintain precise dimensional tolerances.

Quality Assurance

Every Carbon Steel 90° Long Radius Butt Weld Elbow undergoes rigorous quality control:

• Chemical Analysis: Spectrometer testing to verify Carbon, Manganese, and alloy content.

• Mechanical Testing: Tensile strength, yield strength, and elongation verification.

• Non-Destructive Testing (NDT): Radiography (RT) and Ultrasonic Testing (UT) to detect internal flaws in welds (for welded elbows) and material defects.

• Dimensional Inspection: Precision checking of the 90° angle, 1.5D radius, and end-beveling to ensure proper fit-up during welding.

• Surface Treatment: Application of anti-rust oil or black varnish to protect against corrosion during storage and transit.

Packaging

To ensure safe delivery, our elbows are bundled in seaworthy wooden crates or steel pallets with protective separators. Each fitting is clearly marked with the heat number, size, schedule, and "WPB" for full traceability.