Hygienic 90-degree elbows are specialised stainless steel fittings used to change the direction of flow in sanitary pipework while maintaining a smooth, crevice-free internal surface to prevent bacterial growth and product contamination. They are essential in the food and beverage, pharmaceutical, and biotechnology industries.
Key Specifications
These elbows are designed to meet stringent hygiene standards, with specific material grades and surface finishes being paramount.
Material Grades: Typically available in AISI 304 (for general use) and AISI 316L stainless steel. The 316L grade, containing molybdenum, offers superior corrosion resistance in acidic or high-chloride environments and is preferred for pharmaceutical applications.
Surface Finish: The internal surface is critical and often polished (e.g., to a dull or bright finish) to achieve a specified roughness average (Ra), minimizing the adhesion of product residues and microbes. Internal weld beads are typically rolled or removed to eliminate crevices.
Radius Options: Available in various radii to optimize flow and minimize turbulence or pressure drop. Common options include 1 x diameter (1D), 1.5 x diameter (1.5D), and 2D, 3D, or 5D long bends. Longer radii offer smoother flow characteristics.
Standards: Manufactured according to key standards like EN 10357, BS 4825, ISO 2037, or ASTM A270, ensuring dimensional accuracy and quality.
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