TECHNICAL DATA Alfa Laval offers a range of Mechanical Polish as well as Electropolish finishes. Mechanical polishing is achieved by using a progressive series of abrasives, from low to high grit. This allows a consistent internal finish and both optimal and economical cleaning. Electropolishing is a further process that promotes a chromium-enriched surface layer that maximizes corrosion resistance as well as minimizing bacterial build up on surface cavities. Metallurgy - Incoming raw material goes through a stringent inspection process to ensure its chemistry will be ideal for both weldability and electropolishing Quality Control Methods - Our manufacturing facilities operate under an approved ISO 9001 quality standard. Wall thickness integrity is maintained with fabrication grade minimum wall tubing for all cold-formed tubular products. Our BPE fittings are designed for use with all current orbital welding equipment. After cold forming, our tube product is resized to ensure that the ovality falls within the prescribed BPE tolerances. End facing is provided with a machined square-cut method. This allows for the most accurate and consistent orbital weld result. All fittings are put through 100% visual inspection and ovality and squareness tolerances are inspected with calibrated equipment. Surface finish is inspected with a calibrated profilometer to ensure the Roughness average (Ra) maximum is not exceeded. Hygienic fittings identified with this symbol on the following pages are accepted as meeting the 3A Hygienic standards by the appropriate committees of the International Association of Milk, Food and Environmental Sanitarians, U.S. Public Health Service, and Dairy Industry Committee. Surface specification for Alfa Laval Hygienic range Hygienic tubes Alfa Laval designation BC BD CC CD Tri-Clover ® Hygienic Surface texture (Ra µm) Internal Surface Welded area External < 0.8 < 0.8 < 0.8 < 0.8 < 1.6 < 1.6 < 1.6 < 1.6 pickled < 1.0 pickled < 1.0 < 0.8 < 0.8 < 0.8 Standard designation BC BD CC CD No. 4 1 1 According to 3A 33-01 section D1 According to EN 10357-A EN 10357-A EN 10357-A EN 10357-A 3A Treatment Annealed Annealed Not annealed Not annealed Annealed Dimension ranges EN 10357- ISO 2037 A X X X X X X BS 4825 X X Tri-Clover ® Hygienic X Hygienic Fittings Surface designation Dimension ranges Product Internal External DIN ISO BS Mat Mat X Unions Semi bright Semi bright X X X Mirror Mirror 3A 3A Mat Mat X Raw Raw X Raw Semi bright X Bends Raw Polished X X Semi bright Semi bright X Polished Polished X Mirror Mirror 3A 3A Mat Mat X Raw Raw X Tees Polished Polished X X X Mirror Mirror 3A 3A Mat Mat X Raw Semi bright X Reducers Raw Polished X X Semi bright Semi bright X 3A 3A Explanation of surface designation for fittings Alfa Laval designation Surface texture (Ra µm) Internal Mat < 1.6 Raw < 0.8 1 Semi bright < 0.8 1 Not guaranteed in welds Bended area Not spec. Not spec. Not spec. Method Shot Blasted As fabricated or tumbled As fabricated or tumbled Tri-Clover ® Hygienic X X X X