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Ductile iron pipes for drinking water supply An investment in the future The new standard for ductile iron pipes EN 545:2010

En 545 Englisch Netz

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Ductile iron pipes fordrinking water supply

An investment in the future

The new standard for ductile iron pipes

EN 545:2010

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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 thick-

ness 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.

A new standardWHAT HAS CHANGED?

Ductile iron A demonstration of load-bearing capacity  

DN

External diameter [mm] Minimum wall thickness [mm]

NominalLimit

deviationsClass 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 7.7250 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 s izes is determined by a combination of production-related restrictions, producibility and requirements relating to laying or handling. The minimum wall thicknessesquoted 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

 A cast iron pipe from the past 

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What do these changes meanFOR MANUFACTURERS AND USERS?

The casting process On-site laying practices

DN

Minimum wall thickness [mm] Minimum diametral stiffness [kN/m²]

Class 40[EN 545:2006]

Class 40[EN 545:2010]

K9Class 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 – – – 151000 – 24 – – – 14.5

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.

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 Rehabili-

tation 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.

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WESTERN & NORTHERN

EUROPE & POLAND

Duktus Rohrsysteme Wetzlar GmbH

T +49 (0) 6441 49 2260

F +49 (0) 6441 49 1613

[email protected]

SOUTH-EASTERN

EUROPE & CIS

Duktus Tiroler Rohrsysteme GmbH

T +43 (0) 5223 503-105

F +43 (0) 5223 503-111

[email protected]

CZECH REPUBLIC AND

SLOVAK REPUBLIC

Duktus litinové systémy s.r.o.

T +420 311 611 356

F +420 311 624 243

[email protected]

MIDDLE EAST AND

NORTH AFRICA

Duktus Pipe Systems FZCO

T +971 (0) 4 886 56 80

F +971 (0) 4 886 56 40

[email protected]

© • 038 • 01/11 • e 500 • BD

Rhineland

Harald Oster

M +49 (0) 172 73 12 936

[email protected]

Rhine-Main/Southern Palatinate

Heinz-Jörg Weimer

M +49 (0) 151 16 76 87 62

[email protected]

Rhine-Ruhr/NW-Germany

Jürgen Schütten

M +49 (0) 160 71 97 668

 jue rgen .schuet ten@ dukt us.com

Saxony

Michael Klee

M +49 (0) 172 72 39 895

[email protected]

Saxony-Anhalt/Leipzig

Uwe Hoffmann

M +49 (0) 172 72 21 174

[email protected]

Thuringia

Uwe Strich

M +49 (0) 172 81 23 089

[email protected]

Applications Engineering

T +49 (0) 6441 49 1251

[email protected]

AUSTRIA

Tyrol & Vorarlberg

Werner SiegeleM +43 (0) 664 44 30 721

[email protected]

Upper Austria, Northern Salzburg

Ingo KriegM +43 (0) 664 61 18 599

[email protected]

Styria, Carinthia, Southern Salzburg

Walter KorenjakM +43 (0) 664 54 88 353

[email protected]

Styria, Carinthia

Rudolf StelzlM +43 (0) 664 83 48 083

[email protected]

Vienna, Lower Austria, Burgenland

Robert Bladsky

M +43 (0) 664 61 18 595

[email protected]

Vienna, Lower Austria, Burgenland

Gerald Pasa

M +43 (0) 664 32 28 835

[email protected]

Your contacts

Duktus S.A.

Innsbrucker Straße 516060 Hall in TirolAustria

T +43 (0) 5223 503-215

www.duktus.com

DuktusRohrsysteme Wetzlar GmbH

Sophienstraße 52-5435576 WetzlarGermany

T +49 (0) 6441 49 2401F +49 (0) 6441 49 1455

www.duktus.com

DuktusTiroler Rohrsysteme GmbH

Innsbrucker Straße 516060 Hall in TirolAustria

T +43 (0) 5223 503-0F +43 (0) 5223 43619

www.duktus.com

Duktuslitinové systémy s.r.o.

Kost’álkova 1527266 01 BerounCzech Republic

T +420 311 611 356F +420 311 624 243

www.duktus.cz

DuktusPipe Systems FZCO

South Jebel Ali Free ZoneJAFZA View 18/Office No. 909Dubai/U.A.E.

T +971 (0) 4886 56 80F +971 (0) 4886 56 40

www.duktus.ae

GERMANY

Baden-Württemberg/Saarland

Alexander Bauer

M +49 (0) 160 719 76 69

[email protected]

Bavaria

Wilhelm Faulstich

M +49 (0) 172 73 14 807

[email protected]

Berlin/Brandenburg/MV

Lutz Rau

M +49 (0) 172 72 21 175

[email protected]

Hesse/Southern Lower Saxony

Karl-Wilhelm Römer

M +49 (0) 172 72 21 162

[email protected]

ITALY

South Tyrol/Trentino

Christoph Obkircher

M +39 (0) 345 66 08 948

[email protected]