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  9-1 Hygienic Tubes and Fittings AalcoTel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com Section 9Hygienic Tubes and Fittings This Section contains specifications for tubes and fittingsmade specifically for applications where cleanliness of theinternal surfaces of the pipes is paramount. Examples are thefood processing, dairy, brewing, and pharmaceuticalindustries.Subsection and TopicsPage Materials and Manufacturing9-3Tubes9-4Bends and Tees9-5Clamp Fittings9-6IDF Unions9-8RJT Unions9-11 Additional Hygienic Fittings and Components9-14 Specifications covered in this SectionPage BS 4825, 1991, Stainless steel tubes and fittings for the food industry and other hygienic applications, Parts 1-5 9-3Hygienic Tubes - BS 4825 : Part 1 (Tubes)9-4Hygienic Bends and Tees - BS 4825 : Part 2 (Bends/Tees)9-5Clamp Fittings - BS 4825 : Part 3 (Clamp Couplings)9-6IDF Unions - BS 4825 : Part 4 (Threaded Couplings)9-8RJT Unions - BS 4825 : Part 5 (Ring Joint Couplings)9-11  9-2 Hygienic Tubes and Fittings Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com Hygienic Tubes and Fittings - General Hygienic tubes and fittings are produced with internal surfaces which are smooth and donot have obstructions or crevices that could capture the product and subsequently causecontamination of the product. This section is based on British Standard BS 4825 : Parts 1to 5 :1991, which covers all the components parts of an hygienic tube system. American,Swedish and German specifications are also available.  ASTM A 249, A 269 and A270 are the most commonly used manufacturing standards for hygienic tubes. The tube is provided with the internal weld bead removed or flattened,although the ASTM specifications do not necessarily provide for this. Specifications Specifications applicable to hygienic tube and fittings are as follows: ❍  ASTM Tube Standards A 249 (see page 3-16), A269 (see page 3-22) and A 270 (see page 3-30).These are the manufacturing standards mostcommonly specified for hygienic tube. ❍ BS 4825 Parts 1 to 5 : 1991 -             . ❍                                     ❍             (see page 9-5). ❍             see page 9-6).   ❍                       ❍               . This covers        ❍ DIN 11850 to 11852. These specifications cover unions suitable for tube in the range 1 to 4 inoutside diameter, and 25 to 100 mm metric (insidediameter). ❍ US 3A, SMS 1145 and SMS Aseptic. These areadditional American and Swedish specificationscovering unions for hygienic applications. Notes 1Expanded type clamp fitting and union parts are available at these sizes.-Other sizes are available although not specified in BS 4825 : Parts 1 to 5 Summary of tube sizes and available fittings to BS 4825 Parts 1 to 5 Long BendShort BendLong TeeShort TeeReducersClamp FittingsIDF UnionsRJT UnionsExpanded Type Fittings 1 12.7  ✔ ✔    T  o   b  e  a  g  r  e  e   d  w   i   t   h  p  u  r  c   h  a  s  e  r 15.88  ✔ ✔ 19.05  ✔ ✔ 25.4  ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 38.1  ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 50.8  ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 63.5  ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 76.2  ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 101.6  ✔ ✔ ✔ ✔ ✔ ✔ ✔ 114.3  ✔ ✔ ✔ 139.7  ✔ ✔ ✔ 168.3  ✔ ✔ ✔ 219.1  ✔ ✔ ✔ 273.0323.9355.6406.4  Hygienic Tubes and Fittings 9-3 Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com Hygienic Tubes and Fittings - General Materials The material grades specified in BS 4825 : Parts 1 and 2 for hygienic tubes, bend and tees are given in the table.Equivalent grades as specified in applicable ASTM tube standards are also included. . ❍ Stainless Steels used for Clamp Couplingsand IDF/RJT Unions . The material gradesspecified in BS 4825 : Parts 1 and 2 for hygienictubes, bend and tees are given above.Comparable grades are also recommended for clamp and union parts (clamps, liners, male partsand nuts). Steels used for expanded type partsmust additionally meet specified hardnessrequirements because the method of assemblyrequires that the tube be expanded on to the malepart or liner. ❍ Seals . Seal materials must be suitable for thetemperature, pressure and chemical conditionswithin the system and must not shall notconstitute a toxic hazard, or support bacterialgrowth, or give rise to unpleasant taste or odour.BS 4825 seal materials in contact with potablewater must comply with BS 6920 : Part 1. If synthetic rubber seals are used, the material musthave a hardness of 75 to 85 IRHD in accordancewith BS 903 : Part A26. Surface Finishes The type of surface finish for both internal and external surfaces should be specified by the purchaser. Themeasure of the surface quality used in BS 4825 is the Roughness Average, Ra, expressed in µ m. This is anarithmetic average of the absolute values of measured profile height deviations taken within a sampling length.See page 10-12 for further information on surface finishes. ❍ Tubes, Bends and Tees . A maximum R a  of 1.0µm is specified for the internal surface and of 2.5µm for external surface. All tubes, bends andtees are to be clean and free from surface defectsand occlusions. No material that might proveharmful during subsequent use or fabrication shallremain on the surface. Types of finishing include bright annealing of tube, descaling, abrasive cleaning, polishing. ❍ Fittings . All fittings have the same finishrequirements as specified for tube. ❍ Clamp Couplings and Unions . An R a  value of 1.0µm is required for all contact and sealingsurfaces. Marking  All tubes are either be marked on the tube or on a securely attached label on the tube, the wrapping or on thebundle. This marking includes the manufacturer’s name and the specification number under which the tube hasbeen manufactured. It also shows the outside diameter and thickness, the material grade and the cast or batchreference to identify the source of the material. Stainless steel grades BS GradeEquivalent Grade in ASTM StandardsCarbon Content, maxDescription of TubeGradeUNS%304S11304LS304030.03Seamless304S31304S304000.07Seamless316S11316LS316030.03Seamless316S13317LS317030.03Seamless316S31316S316000.07Seamless316S33317S317000.07Seamless304S22304LS304030.03Welded304S25304S304000.06Welded316S22316LS316030.03Welded316S26316S316000.07Welded  9-4 Hygienic Tubes and Fittings Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com Hygienic Tubes - BS 4825 : Part 1 Hygienic tube is commonly supplied to the ASTM standards listed on page 9-2. Weldedtube is made by a continuous welded method and either has the weld bead reduced (beadrolled) or removed. Alternatively tubes may be seamless and cold finished. BS 4825 : Part 1 requirements follow. Dimensions and Tolerances Note 1The 1.2 mm wall thickness is for use with expanded fittings. ❍ Length Tolerances . Random or specifiedlengths may be requested. For specified lengths: <6 m, tolerance = +3mm, -0mm. >6 m, tolerance = +6mm, -0mm. ❍ Surface Finish . See page 9-3 for BS 4825requirements. Additional requirements may bespecified by the purchaser. Ordering The purchaser should specify the following: ❍ Grade of Stainless Steel . See page 9-3. ❍ Specification . ASTM A249, A270 or A269 (seeSection 3, page 3-1). ❍ Method of Manufacture . Welded (bead rolled or removed), or seamless tube. ❍ Tube Dimensions . OD and wall thickness. ❍ Nominal Working Pressure and Temperature .If above 20bar and/or 150°C. ❍ Tube Lengths . Random or specified. ❍ Surface Finish . See page 9-3. ❍ Manufacture’s Certificate . If required. ❍ Marking . If continuous marking is required. Marking Tube marking should include: ❍ Manufacture’s Reference . ❍ BS or ASTM Number and Date . ❍ OD and Wall Thickness . ❍ Material Grade . ❍ Material Cast or Batch Number  . Hygienic tube dimensions and tolerances - BS 4825 : Part 1 OD ToleranceWall Thickness Tolerancemmmm%%12.71.2±0.5 (or ±0.1 mm)±1015.881.2±0.5 (or ±0.1 mm)±1019.051.2±0.5 (or ±0.1 mm)±1025.41.6 (or 1.2 1 )±0.5 (or ±0.1 mm)±1038.11.6 (or 1.2 1 )±0.5 (or ±0.1 mm)±1050.81.6 (or 1.2 1 )±0.5 (or ±0.1 mm)±1063.51.6±0.5 (or ±0.1 mm)±1076.21.6±0.5 (or ±0.1 mm)±10101.62.0±0.5 (or ±0.1 mm)±10114.32.0±0.75±10139.72.0±0.75±10168.32.6±0.75±10219.12.6±0.75±10273.02.6±0.75±10323.92.6±0.75±10355.62.6±0.75±10406.43.2±0.75±10

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