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cement mortar lined ductile iron pipe,
cement lined pipe
BSEN598 Internal Cement Lined Pipe Ductile Iron Centrifugal Cast For Sewage
EN598 high alumina cement mortar lined Ductile Iron Pipe overview:
Dutile iron pipe under EN598 standard shall be delivered with an external coating of zinc with finishing layer and an internal lining of high alumina cement mortar,This shall not preclude special coating arrangements for products which deviate from the requirements for specific design reasons. Pipes for sewers and drains shall be identified externally by one of the following colours: brown, red or grey. This is to allow easy identification of installed sewers and drains. Pipes specifically intended for rain water or surface water sewers (separate systems) may be identified by a different colour other than those used for potable water pipes.The iron thickness of fittings used for pressure sewers shall be in accordance with EN 545, The iron thickness of fittings used for gravity sewers shall be equal to or higher than those of pipes of the same DN.
The metallic zinc coating shall cover the external surface of the pipe and provide a dense, continuous, uniform layer. It shall be free from such defects as bare patches or lack of adhesion. The uniformity of the coating shall be checked by visual inspection. When measured in accordance with 6.7, the mean mass of zinc per unit area shall be not less than 130 g/m2. The purity of the zinc used shall be at least 99,99 %.
The finishing layer shall uniformly cover the whole surface of the metallic zinc layer and be free from such defects as bare patches or lack of adhesion. The uniformity of the finishing layer shall be checked by visual inspection, the mean thickness of the finishing layer shall be not less than 70 mm and the local minimum thickness not less than 50 mm.
Unless otherwise specified in the corresponding European Standard, the internal cement mortar lining of ductile iron pipes shall comply with the requirements
Internal lining of high alumina cement mortar
The cement mortar lining of ductile iron pipes shall constitute a dense, homogeneous layer covering the total internal surface of the pipe barrel. It shall be works-applied by a centrifugal spinning process or a centrifugal spray head or a combination of these methods. Smoothing with a trowel is permitted.Prior to application of the lining, the metal surface shall be free from loose material and oil or grease.
The cement mortar mix shall comprise high alumina cement (with a minimum alumina content of 40 %), sand and water; chloride-free admixtures may be used when necessary. The ratio by mass of sand to cement shall not exceed 3,5. At mixing stage, the ratio by mass of total water to cement depends on the manufacturing process and shall be determined such that the lining is in conformance with 220.127.116.11 and 5.10; it shall not exceed 0,38 in the fresh lining immediately after application.The sand shall have a grading which is adapted to the lining process and thickness, and it shall not contain organic impurities or fine clay particles which can affect the lining quality.The water used in the mortar mix shall be drinking water quality or water that has no harmful effect on the characteristics of the lining.
After application of the fresh lining, controlled curing shall be carried out so as to provide sufficient hydration to the cement.
Packing: bundled with steel belts or in bulk
Shipment: in bulk or container.
Much of the production of ductile iron is in the form of ductile cast iron pipe, used for water and sewer lines. Ductile cast iron pipe is stronger and easier to tap, requires less support and provides greater flow area compared with pipes made from other materials like PVC, concrete, polyethylene or steel. Ductile Iron Pipe is the most widely-used pipeline product in water supply and water drain/sewage projects.
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