Ductile iron pipe
Benefits of ductile iron pipe
|Solid under loads|
In underground conditions, the ductile cast iron pipe has a semi-rigid behaviour: it offers an excellent compromise between mechanical stress in the wall (small DN) and ovality (large DN). It can be laid in high and low height of cover, and easily in soil of low rigidity. The ”ground/semi-rigid pipe” system offers optimum mechanical stability over time, without risk of buckling in large DN.
The PAM pipelines are designed to withstand pressures much greater than the values usually encountered on the networks. The wall thickness is calculated with a safety factor of 3 with respect to the maximum operating pressure. This additional safety margin is very useful to the impacts during installation, accidental overpressure and mechanical operating fatigue.
The ductile cast iron structure has a high elastic deformability and a high resistance to crack initiation: it results in excellent impact resistance. The cast iron pipes are perfectly suited to transport conditions over long distances (truck, train or ship), handling conditions on sites and to different types of backfilling. The ductile cast iron pipelines may be laid in very difficult areas: rocky mountain slopes for hydroelectric plants, crossings for cantilever bridges, rockfill for submarine outlets.
|Push-in joint system|
Quick and self-sealing, the watertightness of the STANDARD push-in joint results from radial compression of the sealing ring (1), by simply inserting the spigot ends into the socket. It does not require any tightening of bolts or a welding process.
The STANDARD “push-in” joint is ideally suited for laying in trenches or overhead, irrespective of weather conditions.
The centrifugation process ensures a perfectly smooth and even cement surface. The Colebrook roughness coefficient of an isolated pipe is k = 0.03 mm. PAM recommends the use of an average value of k = 0.1 mm for sizing networks in order to take into account all the different load losses caused by singular points (tee fittings, elbows, valves, etc.)
All PAM products comply with the current European (EN) and international (ISO) standards.
Through the work of PAM research centre and their knowledge of corrosion phenomena in the soil, the PAM ductile iron pipelines have the latest coating technologies and often exceed the minimum industry standards.
It is also in this centre that the joints are developed and tested in the most extreme conditions. The durability performance of our material, its strength and advanced protection make our ductile iron pipes one of the best choice for your network.
Saint-Gobain PAM is located in over 68 countries on four continents, and thanks to our extensive sales network, we are currently active in more than 140 countries so help is always close at hand. Saint Gobain PAM offers advice and technical assistance to clients until completion of works.
Manufacturing process of ductile iron pipe
- Production an treatment of the molten metal (metallurgy);
- Casting and heat treatment (foundry);
- Testing, coating and lining (products finishing).
These three steps are of course closely inter-related, and continuous control and inspection along the full manufacturing cycle ensure optimum and constant quality of the products.
To know more about this manufacturing process of our ductile iron pipe, watch the image below.