Recommendation for Coatings

Special lining & Coating

Recommendation for Coatings

Type of Coating	Basic Details / Field of Use
Standard Coating	Category – 1 Ductile iron pipes shall be installed with minimum zinc coating of 200g/m² with finishing layer of bitumen of thickness 70 microns (standard coating), in the field with the following specifications: Soils with resistivity higher than 2500 ohm–cm (below water table) or 1500 ohm–cm (above water table). Soil with pH above 6 Soil not containing refuse, cinders, etc.
Other Coatings and Special Coatings	Category – 2 1000 Ω.cm ≤ Soil Resistivity ≤ 1500 Ω.cm (Pipe laid above water table – dry areas) 1500 Ω.cm ≤ Soil Resistivity ≤ 2500 Ω.cm (Pipe laid below water Table – wet areas) Soil with pH above 6 Soil not containing refuse, cinders, etc. Recommended coating: Zinc 200 g/m² with Finishing layer of 100 micron epoxy Category – 3 500 Ω.cm ≤ Soil Resistivity ≤ 1000 Ω.cm Soil with pH above 6 Soil not containing refuse, cinders, etc. Recommended coating: Zinc & Aluminium alloy coating 400 g/m² with Finishing layer of 70 micron of Epoxy Category – 4 Soil Resistivity ≤ 500 Ω.cm Recommended coating: Polyurethane coating in accordance with EN 15189

Type of Coating

Basic Details / Field of Use

Standard Coating

Category – 1
Ductile iron pipes shall be installed with minimum zinc coating of 200g/m² with finishing layer of bitumen of thickness 70 microns (standard coating), in the field with the following specifications:

Soils with resistivity higher than 2500 ohm–cm (below water table) or 1500 ohm–cm (above water table).
Soil with pH above 6
Soil not containing refuse, cinders, etc.

Other Coatings and Special Coatings

Category – 2

1000 Ω.cm ≤ Soil Resistivity ≤ 1500 Ω.cm (Pipe laid above water table – dry areas)
1500 Ω.cm ≤ Soil Resistivity ≤ 2500 Ω.cm (Pipe laid below water Table – wet areas)
Soil with pH above 6
Soil not containing refuse, cinders, etc.
Recommended coating: Zinc 200 g/m² with Finishing layer of 100 micron epoxy

Category – 3

500 Ω.cm ≤ Soil Resistivity ≤ 1000 Ω.cm
Soil with pH above 6
Soil not containing refuse, cinders, etc.
Recommended coating: Zinc & Aluminium alloy coating 400 g/m² with Finishing layer of 70 micron of Epoxy

Category – 4

Soil Resistivity ≤ 500 Ω.cm
Recommended coating: Polyurethane coating in accordance with EN 15189

Note - 1

Suggested coating thickness for polyurethane Coating.

Condition-1

Suggested coating Thickness

500 Ω.cm ≤ Soil Resistivity ≤ 1000 Ω.cm (Pipe laid above water table)

Or 1000 Ω.cm ≤ Soil Resistivity ≤ 1500 Ω.cm (Pipe laid below water table)

& High amount of Sulphate & Chloride in Soil

1500 microns

Soil Resistivity ≤ 500 Ω.cm (Pipe laid above water table)

Or Soil Resistivity ≤ 1000 Ω.cm (Pipe laid below water table) & pH less than 4

& High amount of Sulphate & chloride in Soil

Soils containing refuse, cinders, slag, or polluted by wastes or industrial effluents

2000 microns

Jindal SAW Ltd. is an integral part of the multi-billion-dollar O.P. Jindal conglomerate, one of India’s topmost industry houses…

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