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Ductile Iron Pipes


Ductile Iron Pipes


Ductile Iron Pipes have proved a high efficiency in Multi-purposes, whether, for potable water ,industrial water or waste water, due to its flexibility and high performance regarding stresses and corrosion – resistance.
Ductile iron pipes are the pipes for present and future.
Since its introduction into the marketplace in 1955, Ductile Iron pipe has been recognized as the industry standard for modern water and wastewater systems. More than six decades of field experience have proven its strength, durability, and reliability  for transporting raw and potable water, sewage, slurries, and process chemicals. Ductile’s high degree of dependability is primarily due to its high strength, durability, impact and corrosion resistance. Designed and manufactured to the industry’s most stringent standards,
Ductile Iron pipe resists damage during shipping and handling, and once installed withstands the most demanding operating conditions, including water hammer, frozen ground, deep trenches, areas of high water table and heavy traffic, river crossings, pipe on supports, rocky trenches, and areas of shifting, expansive, and unstable soils. Installation is simple. Unlike some pipe materials, Ductile Iron pipe requires no complex line-and-grade drawings or laying schedules. It can be installed in a wide variety of trench and bedding conditions and can be easily cut in the field. Direct tapping, even in straight lines, doesn’t affect its integrity. And, once installed, Ductile Iron pipe is virtually maintenance free.
The pipe is manufactured in 6m nominal laying lengths from DN150mm – DN1000mm diameters in a range of standard pressure classes and nominal wall thicknesses.
Ductile Iron is furnished with several different types of joints, and a wide variety of standard fittings are available without special order. Although Ductile Iron pipe is usually furnished with cement mortar  lining, optional internal linings are also available for a wide range of special applications.
And Ductile Iron’s generally larger-than-nominal inside diameters, combined with its high flow coefficient, offer substantial savings on pumping and power costs over the life of the pipeline


Range of Pipes

ENC produces Ductile Iron pipes from DN 150 mm to DN 1000 with nominal Laying Length 6 m according to the International Standards ISO 2531 and EN 545

Ductile iron pipes are protected externally with a pure zinc – coat and bitumen BS 10
Ductile iron pipes are internally by cement mortar-lining.
Pipes withstand external pressure resulting from heavy loads, the pipes are not affected, resisting fracture and keeping their original shape due to elasticity property.

pipes withstand internal high pressure during factory tests:
– 60 bar for diameters up to 300 mm.
– 50 bar for diameters from 350 up to 1000 mm.
– 40 bar for diameters from 700 up to 1000 mm

  Pipes have the advantage of small wall thickness which leads to an increase in the internal diameter for the same nominal diameter compared with other types of pipes.
 Pipes have the advantage of high resistively against the high salinity of ground water, aggressive soil and stray electric currents.
 Ductile Iron Pipes are the best types suitable for erection in cities with bending streets  

Applied specification standards :

Ductile Iron Pipe     

EN 545(part 4) , ISO 2531

Push-on Gasket                                                            

EN 681-1, ISO 4633

Cement lining                                                              

EN 545(part4.4.3), ISO 4179

External Coating                                                          

EN 545 ( part4.4.1), ISO 8178

Dimensions of Socket and Spigot Pipes                   

EN 545(part 9.1)

Polyethylene Covering                                               

EN 545(part4.4.1) ,ISO 8180

Zinc coating                                                                  

EN 545 ( part6.6), ISO 8179

Bitumen Coating                                                          

EN 545( part


EN 545 (part 9.1)


Ductile Iron Pipes Applications

  • Due to Ductile Iron pipe’s exceptional strength and durability,
    it can be used in a wide variety of wastewater  applications
  • Ductile Iron pipe is utilized for innovative
    solutions of sewerage piping problems. Illustrated is an
    “at grade” gravity sewer.
  • Well-suited for difficult installations due to its inherent
    strength, Ductile Iron is an excellent piping material for use
    in gravity sewer applications. Its superior ring strength,
    combined with its bottle-tight joints, makes it ideally suited
    for deep trenches and installations in areas of high water table
  • Ductile Iron pipe has long been the material of choice for
    water and waste water treatment plant piping due to its
    wide selection of joints and fittings and the fact that it can
    be fabricated for any application.
  • Ductile Iron is well-suited for use in pipe-on-supports
    applications due to its tremendous beam strength


  • Ductile Iron pipe is often used for inverted siphons in
    difficult installations such as the stream crossing shown
    here because of its great strength, joint integrity, and

       its versatile and readily available joints and fittings.

Technical Details


a  A tolerance of +1 mm applies
b Thicknesses are greater than calculated for “smoothing” between C40 and C30 and also between C30


Internal protection for the pipes

Ductile pipes are used for conveying a wide variety of media,  untreated water, drinking water, sewage. Such liquids can affect the nature of the pipeline in very many aggressive ways.
Our production range contains a number of tried-and-tested interior linings to combat virtually all forms of aggression.

Cement mortar linings conform with ISO 4179/EN 545.
The cement-mortar lining prevents tuberculation of the pipe by creating a high pH condition at the pipe wall and stops the production of red water.

The seal coat provides a barrier between soft or acidic waters and the cement-mortar lining.
Additionally, cement-mortar linings create a hydraulically smooth flow surface inside the pipe, resulting in less friction and thus, less head loss.
Cement mortar linings helps to maintain same flow area and co-efficient of friction over a long period of time

External protection for the pipes

Pipes buried in soil are exposed to soil aggression. So a variety of external protection measures are available to match various type of aggression. 

The following coatings, paints sheaths, and wrappings have long proven themselves in practice: 

1.  Bitumen coating.
According to  (ISO 8179/EN 454),       
plus a top bitumen coating of at least 70 µm. Zinc spraying fuses and sprays zinc wire onto the pipe surface. The following bitumen coating comprises a blend of resistant,   tropics-proof bitumen and inert fillers.

2. Zinc coating

One of the particular features of the external zinc coating is its ability to restore the continuity of the protective layer where small areas of local damage exist. The Zn++ ions migrate through the pore sealer to plug the damage and then convert into stable, insoluble zinc corrosion products


Epoxy lining
Epoxy linings comprise a two component material that is sprayed. They are used from 1 to 14 pH. The thickness of the linings is such to withstand a test at 5 kV. the use of such high-grade and costly material is limited to the few instances in which the medium has a pH lower than 2. 
 (epoxy coating upon Request)

  • N.B : (ENC) can be offer any protected ( Internally & Externally ) by other protection materials upon customer request.