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Pipe standard
ISO2531 AND EN545 CLASS k9 k8 k7 class c40 c30 c25
We can make sure all the technical requirment are according to the international standard.
Composition and class
Metallurgical composition of ductile iron shall confirm to the following requirements (ISO):
3.5% to 3.9% Carbon
1.8% to 2.6% Silicon
Minimum tensile strength: 420(MPa) for pipes
Minimum elastic limits: 300(MPa) for pipes
Minimum elongation at failure: 10% for pipes
Maximum hardness: 230(HB) for pipes
Hydraulic pressure
The pipes of class K9 shall be subject to hydraulic pressure test in the factory as follows:
Diameter (mm) | Hydraulic Test Pressure |
DN80-DN300 | 50 bars |
DN350-DN600 | 40bars |
DN700-DN800 | 32bars |
Internal Lining
The pipes shall be internally lined with a sulphate resisting blast furnace cement mortar. The thickness and the lines shall be in accordance with ISO 4179(1985).The lining shall be applied centrifugally. At the same time cement lining in compliance with ISO4197 could ensure mortar firm, dens, smooth and adhesive.
External Coating
The pipes shall be externally coated in the factory with a metallic zinc coat as primer and a black bituminous or black coal tar based anticorrosive varnish in accordance to ISO 8179(1995). The zinc coat shall be applied by arc gun and the bituminous/tar based coat by an airless gun in at least 2 layers. The quality of zinc spraying conforms to ISO8179,the minimum of zinc spraying per square meter is 130g, and the thickness of bitumen paint is not below 70μm.
The advantage of ductile iron pipe
Ductile iron pipe has the nature of iron, the performance of steel, the anticorrosion performance, good scalability, and easy to install. It is mainly for municipal, industrial and mining water or gas supply and so on. In the low-pressure pipe network, ductile iron pipe with a safe and reliable operation, low damage ratio, easy and fast maintenance, Outstanding antiseptic property.
ductile cast iron pipe