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Butt Weld Fittings（BW)
90°/45° Elbow (LR/SR), Equal / Reducing Tee, Concentric / Eccentric Reducer, Cap, Stub End，Short Radius (SR) Elbow
Standards: ASME B16.9, ASME B16.11, EN, JIS, DIN.
Materials: Carbon Steel (A234 WPB), Stainless Steel (304, 316L), Alloy Steel.
Used in petroleum, chemical, natural gas and pipeline systems.
A Butt Weld 45° Elbow (also termed 45° BW Elbow, 45° Long Radius/Short Radius Elbow) is a critical pipe fitting designed to alter the flow direction within a piping system by precisely 45 degrees. It is connected to adjacent pipes via butt welding, a method that creates a permanent, high-strength, and leak-proof joint. 1. Core Characteristics Connection Type: Butt Weld (BW). The ends are precision-machined with beveled edges (typically 37.5° V-groove) to ensure full-penetration welding, forming a seamless metallic bond with the pipe.Angle: Fixed 45° bend, offering a gentler directional change compared to a 90° elbow, resulting in lower flow turbulence and pressure loss.Radius Types:Long Radius (LR): The standard type, with a center-to-end dimension of 1.5 × Nominal Pipe Size (1.5D). It provides the smoothest flow path and is ideal for most general and high-flow applications.Short Radius (SR): Has a center-to-end dimension equal to the nominal pipe size (1.0D), designed for space-constrained installations.Standards: Primarily manufactured to ASME B16.9 (Factory-Made Wrought Buttweld Fittings), with common alternatives including GB/T 12459, EN 10253, and DIN 2605.Size & Pressure: Available in sizes NPS 1/2" (DN15) up to 80" (DN2000). Wall thicknesses cover standard schedules: SCH 40/STD, SCH 80/XS, SCH 160, XXS, catering to various pressure and temperature ratings. 2. Common Materials Carbon Steel: ASTM A234 WPB, Q235, 20# – The most economical choice for general-purpose applications.Stainless Steel: 304, 316L – Excellent corrosion resistance for chemical, food, and marine environments.Alloy Steel: Chrome-Moly (e.g., WP11, WP22) – For high-temperature and high-pressure services (e.g., power plants).Special Alloys: Duplex, Super Duplex, Nickel Alloys (Inconel, Monel) – For extreme corrosive or high-temperature conditions. 3. Key Advantages Superior Joint Integrity: The full-penetration weld creates a continuous, rigid structure that is far stronger and more resistant to leakage than threaded or socket-welded fittings.Efficient Fluid Flow: The 45° angle and smooth internal bore minimize flow resistance, reducing energy consumption and pressure drop.Durability & Low Maintenance: Robust construction withstands vibration, thermal cycling, and harsh operating conditions, ensuring a long service life.Versatility: Compatible with all pipe materials and suitable for a vast range of industrial fluids (liquids, gases, steam, slurries). 4. Typical Applications Widely used in high-pressure, high-temperature, and critical service piping systems across: Oil & Gas (upstream, midstream, downstream)Petrochemical & Chemical ProcessingPower Generation (thermal, nuclear)Pharmaceutical & Food & BeverageShipbuilding & Water Treatment
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Main products: WN, SO, PL, BL flanges, elbows, tees, reducers, caps. Materials: carbon steel, stainless steel, alloy steel. Standards: ASME, ANSI, EN, JIS, DIN. Export to global pipeline projects. Contact Us