Why choose ductile iron pipe?
Ductile iron pipe has the nature of iron and characteristics of steel. It has good mechanical performance, good ductility and flexibility. Safety factor of "3" enables DIP to withstand high water pressure and protect pipes against water hammer. Zinc coating and cement mortar lining guarantee 50 year of lifespan. Compared with PE, Steel pipe and PCCP, DIP has imcomparable advantages.
General comparison between different pipe material
|Joint||Flexible,joint deflection||Unstable||Affected by external factors||Depends on welding quality|
|Resistance to internal pressure||25-64||8-16||<20||-|
|Resistance to external pressure||Good||Medium||Cannot repair||Good|
|Internal lining||Anti-corrosion & anti-abrasion||Anti-corrosion||OPC,corroded by sewage||Bad adhesion|
|External coating||Good, cathodic protection||Good||Lack cathodic protection||Bad, lack cathodic protection|
|Lifespan||50 years||Design 50 years,affected by environment||10-15 years after failure||15-20 years|