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.
|Total corrosion, mm/year|
|Ductile Iron||Steel 20|
|Steam and hot water pipelines||0,011||0,048|
|Petroleum containing liquids||0,013||0,053|