Corus Tubes EN 10255 transition from BS 1387 Structural & Conveyance Business
EN 10255 A smooth transition with Corus Install Contents 1 Introduction 2 The new standard 4 Detailed comparison 7 Comparison of specifications
Introduction The finished product to BS 1387 is, for all practical purposes unchanged when supplied to the equivalent type or series from the new EN 10255 standard. The new standard contains minor changes to detail but maintains the same overall technical performance requirements for the finished tube. The principal difference is the introduction in EN 10255 of new type L and L1 light tubes, in addition to L2, Medium and Heavy which correspond to the Light, Medium and Heavy tubes as used in BS 1387. The following table gives the directly corresponding types in BS 1387 and EN 10255. Additional Information The following information is applicable to Corus Install tubes supplied to EN 10255: For sizes 17.2mm to 114.3mm OD (10DN to 100DN) the galvanised coating will be in accordance with EN 102040 quality B2. For sizes 13.5, 139.7 and 165mm OD (8, 12.5 and 150DN) the galvanised coating will be in accordance with EN ISO 1461:1999. When required, tubes will be screwed in accordance with EN10226-1 and fitted with a steel socket type heavy in accordance with EN 10241:2000. BS 1387 Light BS 1387 Medium BS 1387 Heavy EN 10255 L EN 10255 L1 EN 10255 L2 EN 10255 Medium EN 10255 Heavy Corus Install tube will be supplied as EN 10255 L2, Medium and Heavy and will fully comply with the requirements of both BS 1387 and EN 10255. Corus Tubes Transition To facilitate specification and use of the new standard, for the period whilst the products are in transition, Corus Tubes will, from the 1st of June 2005, dual reference EN 10255 and BS 1387 in the product descriptions and inspection documents of its Install tubes. On withdrawal of BS 1387 (expected in August 2006) single reference to EN 10255 will be made. CE Marking, as required by the Construction Products Directive, will be introduced onto Corus Inspection documents during the transition period. EN 10255 transition from BS 1387 1
The new standard EN 10255:2004 is the new European standard giving technical delivery requirements for the range of general purpose steel tube, commonly known as gas list, previously specified in the UK as BS 1387:1985. This versatile material has a diverse range of uses in the industrial and general engineering sector, either above or below ground, for conveying liquids and gases or carrying cables. Some typical applications include tube for heating and ventilation, process pipework and sprinkler systems in buildings. Corus Tubes is a major manufacturer of welded hot finished general purpose tube and the information in this document is intended to offer some guidance on how the new European standard differs from BS 1387, particularly in respect of the information to be provided by the customer and the various options available. However, as other standards referenced in BS 1387 have also been changed, for ordering purposes, please refer to EN 10255 for specific requirements in more detail. European standards are produced by CEN, the European standards organisation, and must be implemented by the national standards bodies of all the EU and EFTA member countries. When published by the national body, e.g. the British Standards Institution (BSI) in the UK, the European standard is given the status of a national standard and a national reference is added to the European standard number on the cover and on any other pages included in the national edition, e.g. the National foreword. Thus in the UK the standard is published as BS EN 10255. The main text of the standard, however, remains unchanged and the technical requirements are thus identical in all member countries (although the document is normally translated into the language of the country concerned). As EN 10255 is a harmonised European standard, i.e. a standard that meets the essential requirements of an EC Mandate, thereby enabling CE marking to be applied, the European Commission has agreed that it can be phased in over a period of 21 months. During this transition period to start soon after August 2005, either EN 10255 or BS 1387 can be specified. CE marking will be mandatory 12 months after this date for EN 10255 tube supplied into mainland Europe, but is optional for material supplied into the UK Republic of Ireland or Sweden. From September 2006, EN 10255 will totally replace BS 1387 and the other co-existing National standards in Europe, such as the German standards DIN 2440 and DIN 2441 and the French standard NF A 49-145, which will also be withdrawn. 2 EN 10255 transition from BS 1387
Summary of the main differences between EN 10255 and BS 1387 General Title EN 10255 is needed written around the supply of plain end tubes in the bare and uncoated condition. BS 1387 was written around the supply of either screwed and socketed or plain end tubes in the varnished condition. EN 10255 has a specific grade, S195T, allowing scope for others to be added at a later date. BS 1387 has no specific grade as such, but equates to S195T. Size Range EN 10255 defines tube size by OD x thickness (or thread size and series). BS 1387 defined tube size by nominal (bore) size DN x series. Types and Series EN 10255 has three Light series types L, L1 and L2 as well as a Medium (M) and Heavy (H) series. BS 1387 had only L, M and H. Delivery Conditions EN 10255 requires welded tube to be delivered with the external weld bead trimmed off and also imposes controls on the height of the internal weld bead. BS 1387 imposed no requirements for external bead trimming (although this was normally trimmed off on tubes produced by Corus) or any restrictions on the internal bead height. EN 10255 defines the basic supply condition for tubes as bare and uncoated with options available. BS 1387 defined the basic supply condition for tubes as varnished with options available. EN 10255 defines the basic end supply condition as plain end, again with options available. BS 1387 defined the basic end supply condition as either screwed and socketed or plain end. Certification EN 10255 requires test certification to be supplied with the order, with options available. BS 1387 did not require any test certification to be supplied with the order unless specifically requested by the customer. EN 10255 transition from BS 1387 3
Detailed Comparison between EN 10255:2004 & BS 1387:1985 BS EN 10255:2004 BS 1387:1985 Notes Full title Non-Alloy steel tubes suitable for welding and threading Technical delivery conditions. Screwed and socketed steel tubes and tubulars for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads. EN 10255 is written around the supply of plain end tubes. Threaded ends and sockets are an option. Tube threads shall be external taper per EN 10226-1 or 2. Sockets shall be steel in accordance with EN 10241 or malleable cast iron in accordance with EN10242. Does not contain any details of Tubulars or fittings. Galvanising is an option. Where specified, tubes shall be either suitable for galvanizing to, or supplied galvanized to, EN ISO 1461 or EN 10240, various coating qualities. Status Published August 2004. Co-existence with BS 1387 up to end of May 2006. CE marking may be applied after OJEC (Official Journal of the European Community) announcement (after May 2005). Will be replaced by EN 10255. BS 1387 will be withdrawn at the end of May 2006, after a 21-month transition period following the publication of EN 10255. EN 10255 is prepared under Mandate M/131 and will hence become a harmonised Standard under the CPD. As such the material meets essential requirements and CE marking may be applied. Table 3 on page 8, shows the schedule for the implementation of EN 10255. Steel name S 195 T S (for structural) steel name prefix. 195 for min. yield strength in MPa. T (for tube) steel name suffix. Composition Carbon 0.20% Max Manganese 1.40% Max Phosphorus 0.035% Max Sulphur 0.030% Max Carbon 0.20% Max Manganese 1.20% Max Phosphorus 0.045% Max Sulphur 0.045% Max EN 10255 allows a higher maximum Manganese content, and has reduced maximum levels of Phosphorus and Sulphur. Delivery condition Seamless or (longitudinally) welded tube. Cold formed type L tubes must be heat treated. All other series and types can be heat treated at the manufacturer's discretion. Welded tube only. Supply condition and heat treatment at discretion of manufacturer. Sockets either by welded or seamless process. EN 10255 also allows seamless tube. Sockets can be either EN 10241 (steel) or EN 10242 (malleable iron). (Only steel sockets specified in BS 1387). Size range OD 10.2 to 165.1mm. See Table 1 on page 7, for size range and tolerances plus comparison between OD and DN sizes. Nominal (bore) size DN 8 DN 150 See Table 1 on page 7, for size range and tolerances plus comparison between DN and OD sizes. EN 10255 defines tube size by specified outside diameter (OD) x thickness rather than by nominal (bore) size (DN) x series. It is also permitted to order tubes by thread size and series. A comparison table showing the correlation between specified outside diameter (D), thread size (R) and nominal diameter (DN) is given in Table 1 on page 7. Type designations Light Series 3 types L, L1 and L2 Medium and Heavy series - M and H See Table 1 on page 7 for size range and tolerances plus comparison between OD and DN sizes. See Table 2 on page 7 for specified wall thicknesses. Light (L), Medium (M) and Heavy (H). See Table 1 on page 7 for size range and tolerances plus comparison between DN and OD sizes. See Table 2 on page 7 below, for wall thickness list. L and L1 in EN 10255 relate to ISO 65, L1 to the light series in NF A 49-145 and L2 to the light series in BS 1387. M and H thickness ranges are generally similar to those in BS 1387given in Table 1 on page 7. Thickness tolerance Welded tubes +/- 10% for M, H & L - 8% with the plus tolerance limited by the mass tolerance, for L1 and L2 Seamless tubes ±12.5%. Max. tolerance only applies if the actual bundle weight exceeds theoretical (calculated) value by more than 7.5%. Only welded tubes specified Light -8% Medium and Heavy 10% BS EN 10255:2004 BS 1387:1985 Notes 4 EN 10255 transition from BS 1387
Detailed Comparison between EN 10255:2004 & BS 1387:1985 (continued) BS EN 10255:2004 BS 1387:1985 Notes Thread size 1/8 6 per EN 10226-1 / pren10226-2 1/4 6 per BS 21:1985 BS EN 10226-1 (Taper external threads and parallel internal threads) was published in July 2004. Dimensions of external taper threads and internal parallel threads in EN 10226-1 are generally consistent with BS 21. EN 10226-2 (taper external threads and taper internal threads) is yet to be published. Mass tolerance Welded Tubes: For M, H & L, ± 7.5% for bundles larger than 10t. For L1 and L2, +10% / -8% for individual tubes. Seamless Tubes: See thickness tolerance on page 3. Only welded tubes specified ±4% for consignments larger than 150m +10% / -8% for individual tubes. Available lengths (m) Standard Length: 6 or 6.4 Random length: 4 16, with 2 range Exact Length: No limits set. Random Length: 4m - 7m but can include up to 7.5% of short randoms (1.8 4m) and 5 / 7.5% (depending on diameter) of joined lengths. Mill Length: 6.4 m Approximate Length: By agreement Exact Length: By agreement Longer random lengths. No approximate lengths. Standard lengths equating to mill lengths. Length tolerances (mm) Standard Length: Welded +150 / -50 Seamless ± 500 Random Length: 10% can be below range, but none of these to be less than 3m long (0.75 x 4m minimum) Exact Length: L 6m +10-0 6 < L 12m +15-0 L > 12m +by agreement 0 Random Length: See details above Mill length: - 0 +150 max. Approximate Length: ±150 Exact Length:+6-0 Changes to length tolerances. Weld bead External bead: trimmed flush. Internal bead: not trimmed, height 60% of wall thickness. For tubes to be galvanised, the internal bead to be no higher than 0.3mm + (0.05 x wall thickness). No requirement for bead trimming. New external weld bead trimming requirement and control on ID bead height. No option to trim internal bead. Straightness 33.7mm OD: deviation over tube length L (in mm) not to exceed 0.002 x L. < 33.7mm OD: reasonably straight. 1 in 500 Generally similar requirements. Testing requirements Tensile test, plus bend test or flattening test (depending on OD), leak tightness test, dimensional / visual inspection. Tensile test, plus bend test or flattening test (depending on OD), leak tightness test, bore test on small diameter galvanised tube, dimensional / visual inspection. Tensile test To EN10002-1 To BS18: part 4 EN10002-1 has replaced BS18: part 4. Yield stress (min.) (N/mm 2 ) 195 195 Tensile strength range (N/mm 2 ) 320-520 320-460 EN 10255 allows a higher maximum tensile strength. Elongation (min.) (%) 20 20 Coatings Supplied bare unless customer chooses options for either temporary protective coating or galvanizing. Bare pipe may be ordered as suitable for galvanizing to EN10240 or EN ISO 1461. Galvanized tube to be supplied to EN10240 or EN ISO 1461 (various coating quality options). Supplied varnished unless customer chooses options for either bare or galvanized. Galvanising procedure and quality specified within standard. Basic supply condition uncoated. Options available. Notes EN 10255 transition from BS 1387 5
Detailed Comparison between EN 10255:2004 & BS 1387:1985 (continued) BS EN 10255:2004 BS 1387:1985 Notes End condition Supplied plain end unless customer chooses options for threaded ends or tube with socket. Customer may also choose option to specify socket type. Supplied either plain end or screwed and socketed. Customer may specify screwed tube with no sockets or sockets with a taper thread. Basic supply condition plain end. Options available. End / thread protection Supplied without unless customer chooses options: Plain end - end caps or plugs (types at manufacturer s discretion). Threaded end - thread varnished or with thread protection (types at manufacturer's discretion). No reference to end caps or plugs. Customer option for thread protection on threaded bare tube. Threads on galvanized and varnished tubes to be given a protective coating (type to be at manufacturer's discretion). Option to supply plain end tube with end caps or plugs. Inspection / certification Non-specific in accordance with EN10021. Certificate of compliance with the order 2.1 in accordance with EN10204. Customer option to specify test report 2.2 in accordance with EN10204. Non-specific. No certificate sent with order unless specifically requested by the customer. Where requested, certificate type supplied would be equivalent of EN10204 type 2.1. EN 10255 requires certification with order. Documents may incorporate CE marking after August 2005. Marking on tube Procedure for symbols not specified, only that it should be by a suitable and durable method Only painted bands required. Manufacturers mark. W or S, for welded or seamless. Thickness series / type: H, M, L, L1 or L2. At the manufacturer's discretion, the series / type designation can be replaced by a 50 mm wide colour band as follows: L - Green L1 - White L2 - Brown M - Blue H - Red Each tube to be marked as a minimum within one metre of one end. 50mm wide colour band. Tubes < 4m long, - one band only. Tubes > 4m long, - two bands, one close to each end. Light (L) - Brown Medium (M) - Blue Heavy (H) - Red Bundle labelling Each bundle to have a label attached with the following information: No reference to labelling. EN 10255 requires bundle labels. Manufacturer s name or mark EN 10255 W or S, for welded or seamless The specified outside diameter or thread size. Series or type or specified wall thickness. 6 EN 10255 transition from BS 1387
Table 1: Comparison of Outside Diameters and Tolerances between EN 10255 & BS 1387 showing correlation between specified outside diameter (D), nominal diameter (DN) and thread size (R) EN 10255 BS 1387 EN 10255 & EN 10255 EN 10255 EN 10255/ EN 10255 BS 1387 Specified BS 1387 BS 1387 Outside Nominal Thread Diameter Diameter Designation Type L Type L1 EN 10255 Series Series Type L2 & M & H M & H (D) (DN) (R) BS 1387 L (mm) (mm) (mm) (mm) (mm) (mm) Min Max Min Max Min Max Min Max Min Max 10.2 6 1 / 8 9.8 10.6 13.5 8 1 / 4 13.2 13.9 13.2 13.9 13.2 13.6 13.2 14.0 13.3 13.9 17.2 10 3 / 8 16.7 17.4 16.7 17.4 16.7 17.1 16.7 17.5 16.8 17.4 21.3 15 1 / 2 21.0 21.7 21.0 21.7 21.0 21.4 21.0 21.8 21.1 21.7 26.9 20 3 / 4 26.4 27.1 26.4 27.1 26.4 26.9 26.5 27.3 26.6 27.2 33.7 25 1 33.2 34.0 33.2 34.0 33.2 33.8 33.3 34.2 33.4 34.2 42.4 32 1 1 / 4 41.9 42.7 41.9 42.7 41.9 42.5 42.0 42.9 42.1 42.9 48.3 40 1 1 / 2 47.8 48.6 47.8 48.6 47.8 48.4 47.9 48.8 48.0 48.8 60.3 50 2 59.6 60.7 59.6 60.7 59.6 60.2 59.7 60.8 59.8 60.8 76.1 65 2 1 / 2 75.2 76.0 75.2 76.3 75.2 76.0 75.3 76.6 75.4 76.6 88.9 80 3 87.9 88.7 87.9 89.4 87.9 88.7 88.0 89.5 88.1 89.5 101.6-3 1 / 2 100.3 101.2 - - - - - - - - 114.3 100 4 113.0 113.9 113.0 114.9 113.0 113.9 113.1 115.0 113.3 114.9 139.7 125 5 138.5 140.8 - - - - 138.5 140.8 138.7 140.6 165.1 150 6 163.9 166.5 - - - - 163.9 165.1 164.1 166.1 Notes: 1) EN 10255 can be ordered by Outside Diameter (D) and thickness OR by thread size (R) and Series / Type (L, L1, L2, M, H). 2) BS 1387 is ordered by Nominal Diameter (DN) x L, M or H. Table 2: Comparison of wall thickness between EN 10255 & BS 1387 also showing correlation between specified outside diameter (D), nominal diameter (DN) and thread size (R) EN 10255 BS 1387 EN 10255 & EN 10255 EN 10255 EN 10255 BS 1387 EN 10255 BS 1387 EN 10255 BS 1387 Specified Equivalent BS 1387 Outside Nominal Thread Diameter Diameter Designation Type L Type L1 Type L2 L Series M Series H (D) (mm) (DN) (R) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) 10.2 6 1 / 8 - - - - 2.00-2.60-13.5 8 1 / 4 2.00 2.00 1.80 2.30 2.90 17.2 10 3 / 8 2.00 2.00 1.80 2.30 2.90 21.3 15 1 / 2 2.30 2.30 2.00 2.60 3.20 26.9 20 3 / 4 2.30 2.30 2.30 2.60 3.20 33.7 25 1 2.90 2.90 2.60 3.20 4.00 42.4 32 1 1 / 4 2.90 2.90 2.60 3.20 4.00 48.3 40 1 1 / 2 2.90 2.90 2.90 3.20 4.00 60.3 50 2 3.20 3.20 2.90 3.60 4.50 76.1 65 2 1 / 2 3.20 3.20 3.20 3.60 4.50 88.9 80 3 3.20 3.60 3.20 4.00 5.00 101.6-3 1 / 2 3.60 - - - - - - - 114.3 100 4 3.60 4.00 3.60 4.50 5.40 139.7 125 5 4.50 - - - 5.00 5.40 165.1 150 6 4.50 - - - 5.00 5.40 Notes: 1) EN 10255 can be ordered by Outside Diameter (D) and thickness OR by thread size (R) and Series / Type (L, L1, L2, M, H). 2) BS 1387 is ordered by Nominal Diameter (DN) x L, M or H. EN 10255 transition from BS 1387 7
Table 3: Details of transition period for adoption of EN 10255 / withdrawal of BS1 387 Event Approximate Duration 1 Anticipated Date Comments Publication of EN 10255 August 2004 Introduction Period 9 months To May 2005 2 This period allows time for any necessary changes to be made to National regulations and for existing stocks of BS 1387 to be run down. Either BS 1387 or EN 10255 can be specified. EN 10255 should also be announced in the Official Journal of the European Community during this period, with this announcement setting the date of applicability of EN 10255 as a harmonized standard, i.e. the date after which CE marking can be applied. Implementation Period 12 months To June 2006 2 A further period of co-existence for BS 1387 and EN 10255 but CE marking may be applied to EN 10255 products. EN 10255 is to be used exclusively and CE marking applied. (NOTE: CE marking is not mandatory in the UK, Sweden or Irish Republic but will be required elsewhere in mainland Europe). Withdrawal of BS 1387 1 July 2006 1 The duration periods shown are approximate and are based on an ideal situation. 2 EN 10255 has not yet been announced in the Official Journal of the European Community and accordingly these dates can only be taken as approximate and may be revised. Table 4: Principal Standards referenced in EN 10255 and their equivalents in BS 1387 EN 10255 BS 1387 Standard Title Equivalent Standard referenced EN 10002-1 Metallic materials Tensile testing Part 1: BS 18 (Replaced by EN 10002-1) Method of test at ambient temperature EN ISO 2566-1 Steel conversion of elongation values Part 1: carbon and low BS 3894 (Replaced by EN ISO 2566-1) alloy steels EN 10204 Metallic products Types of inspection documents Manufacturer's certificate of compliance (optional). EN 102321 Metallic materials Tube (in full section) Bend test Specified within BS 1387, not as a separate standard. EN 102332 Metallic materials Tube Flattening test Specified within BS 1387, not as a separate standard. EN 10240 Internal and/or external protective coatings for steel tubes Specified within BS 1387, Specification for hot dip galvanized coatings applied in automatic plants not as a separate standard. EN 10241 Steel threaded pipe fittings ISO 50 (Withdrawn.) (BS 1740) (Replaced by EN 10241) EN 10242 Threaded pipe fittings in malleable cast iron Not specified. EN 10246-1 Non destructive testing of steel tubes Part 1: Automatic electromagnetic Eddy current test specified within testing of seamless and welded (except submerged arc welded) BS 1387 Appendix B, not as a ferromagnetic steel tubes for verification of hydraulic leak tightness separate standard. EN 10226-1 Pipe threads where pressure-tight joints are made on the threads BS 21 (Part replaced by EN 10226-1) Part 1: Taper external threads and parallel internal threads Dimensions, tolerances and designation pren 10226-2 Pipe threads where pressure-tight joints are made on the threads BS 21 (Will be replaced when Part 2: Taper external threads and taper internal threads EN 10226-2 is published.) Dimensions, tolerances and designation EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles Specified within BS 1387, not Specifications and test methods as a separate standard. 8 EN 10255 transition from BS 1387
www.corusgroup.com Care has been taken to ensure that this information is accurate, but Corus Group plc, including its subsidiaries, does not accept responsibility or liability for errors or information which is found to be misleading Designed by Eikon Ltd Corus Tubes Structural & Conveyance Business Sales Enquiries contact: UK Sales office PO Box 6024, Weldon Road Corby, Northants NN17 5ZN United Kingdom T +44 (0)1536 402121 F +44 (0)1536 404127 www.corustubes.com corustubes.s-c@corusgroup.com Technical Helpline (UK Freephone) 0500 123133 or +44 (0) 1724 405060 Corus Tubes Structural & Conveyance Business Sales Enquiries contact: Netherlands Sales office Postbus 39 4900 BB Oosterhout The Netherlands T +31 (0)162 482300 F +31 (0)162 466161 corustubes.s-c@corusgroup.com English Language CT42:2000:UK:07/2005