Pressure

Hatati ductile iron pipes are manufactured with standard nominal pressure ranges of K9 for DN100 to DN600 diameters

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Polyethylene Sleeving

Some International Water agencies specify polyethylene sleeving of ductile iron pipes as a means of additional passive corrosion protection. Polyethylene sleeving provides corrosion protection in aggressive soils by creating a uniform environment around the pipe and limiting oxygen exposure.

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Loose PE sleeving is installed on site to ductile iron pipelines in the form of a tubular film. Cut lengths are slipped over the pipe, overlapped and wrapped up tight before securing in place with bands and plastic adhesive tape.

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Polyethylene sleeving should be installed in accordance with ISO14001 “Guidelines for the application of polyethylene sleeving to ductile iron pipeline”. Accredited pipe layers trained in the application of sleeving should be employed.

Seal Coating

An optional bituminous seal coat may be applied to the cement mortar lining on ductile Iron pipes.

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The intended purpose of a seal coat is to reduce the contact between the cement mortar lining and the contents of the water main, thereby restricting lime leaching and consequent high pH levels in supply when conveying soft (i.e. low carbonate alkalinity) water, especially where flow rates are low and residence times are lengthy. Consideration should be given to the use of seal coatings where the total alkalinity of the water being conveyed is less than 30 mg/L.

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The seal coat adhesion rating and coating thickness comply with the requirements of ISO7005-2/EN1092-2 “Ductile Iron pipes and fittings” and ISO16132 “Ductile iron pipes and fittings — Seal coats for cement mortar linings”.