1. Ductile iron pipe and fittings shall be in accordance with BS EN 598 1995 or with International Standard ISO 2531 or such other established and internationally recognized standard providing for requirements equal to or exceeding those of ISO 2531 or BS EN 598 1995.
2. Flanges & bolting shall be confirmed to BS 4504 1969 for 16 bar test pressure.
3. Ductile iron pipe and fitting joints, unless otherwise noted in the Schedule of Quantities, shall be either of the ‘bolted gland’ or the ‘flexible non restraining’ spigot and socket type utilising electrometric gasket rings, at the option of the contractor and to the approval in all respects of the Engineer. A complete set of jointing material shall be supplied for each joint together with an additional 5% of the total material and lubricant as spare.
4. All ductile iron pipes and fittings used for sewerage purposes shall be internally lined with a high alumina cement mortar lining in accordance with section 4.4.3 of EN 598 1994. Externally pipes shall be coated with metallic Zinc covered by a finishing layer of a bituminous product or synthetic resin compatible with Zinc in accordance with section 4.4.2 of EN 598 1994.
5. Pipes for underground installation shall either be externally coated at the manufacturer’s factory and with an approved polythene coating or sleeved at site prior to installation. Sleeving shall be to an approved standard, be adequately restrained and free from tears, pinholes and other damage. An approved proprietary system shall he employed for each pipe joint.
6. Pipes for sections of pipeline constructed above ground shall be supplied complete with materials for an appropriate site applied additional coating system to provide a final finished colour to exposed pipes of either white or aluminium to reduce thermal effects.
7. Polythene coating to ductile iron pipes and fittings shall in its manner of application and characteristics comply with DIN standard 30674.
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