EN 545:2010 - Duktus

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A new standard WHAT HAS CHANGED? For centuries now, cast iron has been used for the pipelines laid for drinking water supply. Today it takes the form of ductile cast iron which, thanks to its ductility, up-to-date connecting techniques and ongoing developments in the internal and external coatings used, will give an assured working life of up to 140 years. The requirements to be met by the material and coatings are laid down in European standard EN 545. A revised version of this standard appeared in December 2010 and the most important changes it contains relate to the changeover from wall thickness classes “K” to pressure classes, and to the reduction in the minimum wall thickness required for class 40, a class which was already included in EN 545:2006. DN External diameter [mm] Minimum wall thickness [mm] Nominal Limit deviations A cast iron pipe from the past Class 20 Class 25 Class 30 Class 40 Class 50 Class 64 Class 100 80 98 +1/-2.7 3.0 3.5 4.0 4.7 100 118 +1/-2.8 3.0 3.5 4.0 4.7 125 144 +1/-2.8 3.0 3.5 4.0 5.0 150 170 +1/-2.9 3.0 3.5 4.0 5.9 200 222 +1/-3.0 3.1 3.9 5.0 7.7 250 274 +1/-3.1 3.9 4.8 6.1 9.5 300 326 +1/-3.3 4.6 5.7 7.3 11.2 350 378 +1/-3.4 4.7 5.3 6.6 8.5 13.0 400 429 +1/-3.5 4.8 6.0 7.5 9.6 14.8 500 532 +1/-3.8 5.6 7.5 9.3 11.9 18.3 600 635 +1/-4.0 6.7 8.9 11.1 14.2 21.9 700 738 +1/-4.3 6.8 7.8 10.4 13.0 16.5 800 842 +1/-4.5 7.5 8.9 11.9 14.8 18.8 900 945 +1/-4.8 8.4 10.0 13.3 16.6 1000 1048 +1/-5.0 9.3 11.1 14.8 18.4 Notes: The figures printed in bold indicate the standard range of pipes supplied. The boxes in the table which are shaded in dark grey represent products to which EN 545 does not apply. The minimum wall thickness for pressure pipes of lower DN sizes is determined by a combination of production-related restrictions, producibility and requirements relating to laying or handling. The minimum wall thicknesses quoted are for joints not subject to longitudinal forces. Pipes of pressure classes between 50 and 100 can be calculated and supplied to special order. Values in boxes shaded in blue correspond to class K9 of EN 545:2006 Ductile iron A demonstration of load-bearing capacity
What do these changes mean FOR MANUFACTURERS AND USERS? Under the new standard EN 545:2010, a ductile iron pipe of, for example, DN 150 and class 40 is supplied in a minimum wall thickness of 3 mm. With non-restrained joints, this wall thickness guarantees a maximum allowable operating pressure PFA of 40 bars. If a ductile iron pipe of a nominal size of DN 150 with the tried and tested nominal wall thickness of 6 mm as used in the past is required, either a K9 pipe under the “old” EN 545:2006 or a class 100 pipe can tendered or ordered. The following points should be taken into account when deciding to use such a pipe • The pressure classes given do not apply when the joints used are restrained. For restrained joints, the pressures ranges for use should be found from the current product documentation issued by the manufacturer. • A reduction in wall thickness inevitably means a reduction in the safety margins. • A ductile iron pipe is “forgiving” (e.g. in case of problems during transportation) and can handle high traffic loads without any problems. • There is a reduction in diametral stiffness as the wall thickness goes down. DN Minimum wall thickness [mm] Minimum diametral stiffness [kN/m²] Class 40 [EN 545:2006] Class 40 [EN 545:2010] The casting process On-site laying practices K9 What we recommend As well as pipes of pressures classes up to class 100 under EN 545:2010, Duktus also continues to supply pipes to EN 545:2006 with no change to the safety margins or to the quality that our customers have come to expect. We know that ductile iron pipes, due to their long “working life”, are the most sustainable investment in the future in water supply. According to the DVGW (German Technical and Scientific Association for Gas and Water) (document W 401 – Entscheidungshilfen für die Rehabilitation von Wasserrohrnetzen [Aids to decision-making for the rehabilitation of water-pipe networks]), ductile iron pipes with a cement mortar coating are the only material that allows pipelines to be costed for an operating life of 140 years. An investment in Duktus pipes means a significant increase in the life of water-pipe networks, reduces demand for raw materials and spares future generations from the financial burden and the need for renovation work. Class 40 [EN 545:2006] Class 40 [EN 545:2010] Class 30 [EN 545:2010] Class 25 [EN 545:2010] 80 3.5 3.0 2,700 1,200 850 – – 100 3.5 3.0 1,500 680 480 – – 125 3.5 3.0 810 370 260 – – 150 3.7 3.0 480 250 160 – – 200 3.9 3.1 230 130 78 – – 250 4.2 3.9 160 91 74 – – 300 4.8 4.6 110 68 68 – – 350 5.3 89 67 – 46 – 400 6.1 72 63 – 34 – 500 – 52 – – 27 – 600 – 41 – – 26 – 700 – 34 – – – 17 800 – 30 – – – 15 900 – 26 – – – 15 1000 – 24 – – – 14.5
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EN 545:2010 - Duktus

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