ductile iron pipe class K9

ductile iron pipe with socket and spigot ISO2531 K9/EN545 6M/5.7M internal cement lining,external zinc/bitumen painting

Ductile cast iron socket and spigot  pipes and accessories shall be centrifugally casted in accordance with ISO 2531(1998) class K9

Water tightness shall be insured by the push-on joint for the pipes

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

hydrostatic pressure

The pipes of class K9 shall be subject to hydrostatic pressure test in the factory as follows:

DN80 to DN300:50 bars

DN350 to DN600:40 bars

DN700 to DN800: 32 bars

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.

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.

ductile iron pipe class K9