 Standard |
Pipes and fittings are all produced according to GCC Standardization Organization (GSO) GSO EN 295-1:2008 which is fully complying with EN 295, and AST.M C 700.
All these standards are concerned with the clay pipes with socket and spigot used for sewerage and water system under the effect of the gravity at the atmospheric pressure. |
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| Raw Material |
Vitrified clay pipes are produced form homogeneous mixture of raw clay and other suitable materials of clay which has been already fired and grounded to the required grain size. The internal and external surface of the barrel are coated with glaze.
High standards of quality are achieved through the use of modern clay preparation plant and control of firing in shuttle kilns. Quality control is rigorously applied in the interests of consistent high performance standards. Measurement checks are made on every pipe. |
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| Dimensions |
| Pipes and fittings are manufactured to tolerances specified in the standards as well as the deviation from straightness of the barrel of the pipe. |
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| Crushing Strength |
| All pipes are produced to withstand at least the crushing forces listed in the table for different International standards in kN/m . Higher crushing strengths are guaranteed by the company. |
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| Crushing strength in kN/m |
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| * SVCP values are minimum guaranteed crushing strength |
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| Watertightness and Impermeability |
| Pipes and fittings must withstand the relevant watertightness or impermeability tests of the different standards mentioned (5m head of water) and in all cases allowable loss ≤ 0.07 l/m2 x 15min. |
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| Chemical Resistance |
| Clay pipes and fittings are not attacked by substances contained in waste water or ground water or soils and resist developed gases and all chemicals found in sewage (acid and alkali). This fact applies to the body of the pipe and the glaze. Clay pipes and fittings will satisfy the chemical tests of the different international standards in the range of PH 2 - 12 at 70oC. |
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| Joint Characteristics |
1- Watertightness
Pipes and fitting joints must be lastingly impermeable to internal and external water pressures (5m head of water) when subjected to the interactions which may arise between them and their surroundings.
2- Angular Deflection
The tightness of the joint must be maintained when pipes are angularly deflected relative to one another according to the table below.
3- Shear Strength
Tightness must be maintained when the joint is subjected to shear force of the specified load as per the previously mentioned standards, In any case shear strength ≥ 25 N/mm2 nominal size.
4- Joint Chemical Resistance
Joints are not influenced by chemicals and remain tight in the pH range 2 - 12.
5- Temperature Resistance
The efficiency of the joints is maintained at temperature ranging between 10o and 70oC.
6- Resistance to ageing
The compression pressure is of decisive importance for the "Steckmuffe" joint. In order to achieve a permanent tightly sealing joint, it is essential that the initial sealing pressure is continuously maintained at a sufficiently high level. For this requirement, the following factors are made use of:
- Drop in relaxation and an increase in creep deformation.
- The relaxation in stress approaches a limit asymptotically so that finite relaxation is maintained.
- Creep deformation also approaches a limit asymptotically, resulting in finite deformation.
- The remaining relaxation and deformation are sufficient to maintain a fully effective seal. |
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| Resistance to Root Penetration |
| "Steckmuffe" joints are not susceptible to root penetration. |
