A) Technical Specifications

Product Name Ductile Iron Pipe with Socket & Spigot ends suitable  for Push-on-Jointing
Class of Pipe C20, C25, C30, C40, C50, C64, C100 & Class K9
Size Range DN 80mm to DN 1000mm
Standard Length 5.5m / 6.0m
Internal Linings    
  • Cement* Mortar Lining     
  • Cement Mortar Lining with  Bituminous Seal Coat     
  • Cement Mortar Lining with Epoxy  Seal Coat   
 *Cement Type: OPC/ Sulphate  Resistant Cement/ Blast Furnace Slag  Cement  / High Alumina Cement
Outside Coatings    
  • Zinc Coating (130 gm/m2  or 200 gm/m2  or 400 gm/m2) with  finishing layer of Bitumen/ Blue Epoxy/ Red Epoxy      
  • Polyethylene Sleeving    
 Alloy  of Zinc and Aluminum with or without other metals having a minimum mass of 400 gm/m2  with finishing layer of Bitumen/Blue Epoxy/Red Epoxy
Coating of Joint Area Bitumen;      Epoxy;      Polyurethane.
Conforming Specifications IS 8329 ;      ISO 2531 :      ISO 7186 ;      BS EN 545 ;      BS EN 598
Quality Certifications British Standards Institute and DNV
Product Certifications British Standards Institute and Bureau Veritas


Currently Class K9 and Class 40 pipes are being manufactured and supplied. Other classes will be offered in the near future.

B) Dimension Details

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C) Lining /Coating on Ductile Iron Pipes

Internal Lining

Ductile Iron Pipes installed in water systems today are normally provided with cement mortar lining. Use of cement lining of the pipe avoids tuberculation by creating a high pH at the pipe wall, and ultimately by providing a physical barrier to the flow water to contact with the pipe wall. Further, linings are also smooth, which results in high coefficients with Haizen Willams C as 140 (Colebrook coefficient k = 0.1). In case of sewerage application, suitable lining will provide corrosive resistance to septic transformation (cycle of sulphates, sulphuric acid) to avoid severe carrion to pipe wall. The advantages of internal cement mortar lining are:

  •    Internal protection of pipe wall against fluid aggressiveness
  •    Improvement and performance of pipe flow characteristics
  •    For potable water pipelines, assurance of keeping water quality within  
       specified limits.
  •    Withstand against corrosion due to septic transformations.

Types of Lining & Service Conditions

    Type of Lining Material Service Condition Reference Standards
    Ordinary Portland Cement Drinking water ISO 4179BS EN 197-1
    Blast Furnace Slag Cement Drinking water ISO 4179BS EN 197-1
    Portland Slag Cement Drinking water ISO 4179BS EN 197-1
    Sulphate resistance Cement Raw water/Drinking Water/ Sea water/ Non-septic Sewers ISO 4179BS 4027
    High Alumina Cement Septic Sewers/ Drinking Water/Acids/ Alkali waters/ Pickling Brine/ Sea water ISO 4179BS EN 14647
    Cement Mortar Lining with Bituminous/epoxy Seal Coat Drinking water/ Sewers ISO 4179BS EN 14901

    Outer Coating

    Intrinsic corrosion resistance of Ductile Iron in various corrosive soils is as least as good as and even somewhat better than that of Cast Iron, as there is not much variation chemically between the two materials. When subjected to corrosion, the nodular graphite of ductile iron pipes forms corrosion by products that adhere firmly to the unattached metal, which provides a barrier against further corrosion. In addition, uniform spreading of spheroidal graphite of ductile iron results in less susceptible to deep localized pitting than that of grey iron pipe, which is important in evaluating its relative resistance to failure by perforation. Due to rubber gasket jointing, ductile pipes are electrically discontinuous. As a result, long line corrosion current, which is dependent on exposure of a single electrical unit to varying soil conditions, can not develop. Additionally, any accumulation of stray current is limited to short electrical units and usually is of little significance in developing corrosion.

    Additional external protection to ductile iron pipe provides long service performance, especially for smaller diameter pipes where wall thickness is comparatively less. Following external protection is normally being provided:-

    Types of Coating

    S. No. Type of Coating Reference Standards
    1 Zinc coating with finishing layer of Bitumen/ Epoxy ISO 8179 -1
    2 Zinc coating with finishing layer with additional protection by polyethylene sleeving ISO 8180
    3 Alloy of Zinc and Aluminum with or without other metals having a minimum mass of 400 gm/m with finishing layer. ISO : 14713