The High-Pressure Stainless Steel 90-Degree BW (Butt-Weld) LR (Long Radius) Elbow is a precision-engineered pipe fitting designed for high-pressure, high-integrity piping systems where flow efficiency and structural stability are paramount. Constructed from seamless 304 or 316 stainless steel, this elbow features a 1.5D radius and butt-weld ends (ANSI B16.25 compliant), ensuring minimal pressure loss and maximum resistance to fatigue in critical applications.
Premium Seamless Design:
Extruded from a single billet of stainless steel (304/316), eliminating weld seams and weak points, with a minimum tensile strength of 515 MPa and elongation ≥30%.
Butt-weld ends with precision bevel (37.5° ±1.5°) for full-penetration welds, compliant with ASME B31.1 (power piping) and B31.3 (process piping) codes.
Flow & Stress Engineering:
1.5D centerline radius (ANSI B16.9 compliant) reduces flow resistance by 20% compared to standard elbows, with a hydroformed internal surface (Ra ≤1.6μm) for laminar flow.
Reinforced heel and toe sections (1.2x wall thickness) withstand thermal expansion forces and vibration, critical for pump and compressor connections in refineries.
Extreme Environment Performance:
316 stainless steel variant with 2% molybdenum resists pitting in chloride-rich environments (e.g., seawater, brine), with a passivated surface reducing corrosion rates by 40%.
Rated for pressures up to 2,500 PSI (schedule 80, 316 stainless steel) and temperatures from -196°C (LNG) to 650°C (steam), with optional heat treatment for high-temperature creep resistance.
Quality Assurance:
100% radiographic testing (RT) for welds (where applicable) and dimensional checks via 3D laser scanning, ensuring compliance with ISO 9001:2015 and customer-specific specifications.
Ideal for mission-critical industrial and infrastructure projects:
Oil & Gas Transmission: High-pressure gas pipelines and refinery process lines, with 316 stainless steel meeting NACE MR0175 for sour gas service.
Nuclear Power: Secondary coolant lines in nuclear reactors, compliant with ASME BPVC Section III (Class 2/3) for safety-related components.
Aerospace Fuel Systems: High-purity fuel lines in aircraft ground support equipment, with 304 stainless steel meeting SAE AS4059 for aerospace fittings.
Marine Propulsion: Engine cooling lines in large vessels, with 316 stainless steel enduring cavitation erosion and saltwater corrosion for 20+ years.
Q: What is the minimum bend radius for this elbow?
A: The long-radius (LR) design has a bend radius of 1.5x pipe diameter (e.g., 152mm for 4" NPS), ensuring compliance with ANSI B16.9 for standard LR elbows.
Q: Can these elbows be cold-formed for custom angles?
A: No, cold-forming may compromise material integrity. Custom angles (e.g., 60°, 30°) are available via hot-forming processes for specific projects.
Q: How to inspect for internal corrosion in long-term use?
A: Use ultrasonic thickness (UT) testing annually to monitor wall thinning, especially in areas exposed to abrasive media or corrosive fluids.
Q: Are there non-magnetic options for sensitive applications?
A: Yes, 316L stainless steel offers low magnetic permeability (≤2.0 μH/m), suitable for MRI facilities and cryogenic magnet systems.
Address
Building 2, No.3991, Binhai 3 Road, Wenzhou Economic Technological Development
Tel
