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Longevity

 The expected faultless service life of ductile iron pipeline systems:

  • In water supply networks under the condition of soil corrosion, stray current and absence of cathodic protection is 80 to 100 years;
     
  • In sewage networks with hydrogen sulphure it reaches 50 - 60 years.
Corrosion resisting prperties of ductile iron pipes are 5-10 times higher than steel pipes.

 

Total corrosion, mm/year
Ductile Iron Steel 20
Sea water 0,01-0,06 0,1-0,8
Steam and hot water pipelines 0,011 0,048
Petroleum containing liquids 0,013 0,053


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