|Outer Surface:||Zinc And Bitumen Layer||Inner Lining:||High-alumina Cement|
concrete lined ductile iron pipe,
cement lined pipe
BSEN598 Standard Ductile Iron Pipe High Alumina Cement Mortar Lining Anti Rust
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.
Thickness and surface condition
The nominal thickness of the cement mortar lining and its tolerance shall be as given in Table 4.
The surface of the cement mortar lining shall be uniform and smooth. Trowel marks, protrusion of sand grains and surface texture inherent to the method of manufacture are acceptable. However, there shall be no recesses or local defects which reduce the thickness to below the minimum value given in Table 4. The grinding of the lining in order to remove the top surface of the internal layer is permitted provided the finished lining complies with all requirements.
Fine crazing and hairline cracks associated with cement rich surfaces may appear in dry linings. Shrinkage cracks inherent to cement-bound materials may also develop in the dry linings. After curing of the lining and under normal storage conditions, the crack width and the radial displacement (disbondment) shall not exceed the values given in Table 4.
Table 4 — Thickness of cement mortar lining
|Thickness||Maximum crack width and radial displacement|
|Nominal value||Limit deviation a|
|80 to 300||4||- 1,5||0,4|
|350 to 600||5||- 2,0||0,5|
|700 to 1200||6||- 2,5||0,6|
|1400 to 2000||9||- 3,0||0,8|
|a The lower limit only is given.|
Cement mortar linings at pipe ends may have a chamfer of maximum length 20 mm.
NOTE Storage of pipes and fittings in a hot, dry environment can cause metal expansion and mortar shrinkage which can result in the dry lining developing areas of disbondment and shrinkage cracks exceeding the width given in Table 4. When the lining is re-exposed to water, it will swell by absorption of moisture and the cracks will close to conform to Table 4 and will eventually heal by an autogenous process.
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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