Resistance to pressure of cast iron networks
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Standard requirements according to EN 12056
Gravity wastewater drainage systems and ventilation systems generally operate without pressure. Although this does not exclude the possibility of pressure arising in the systems under specific operating conditions.
EN 12056-1 section 5.4.2 Water and Gas Tightness, states that drainage installations must be sufficiently water and gas tight to withstand operating pressure.
Furthermore, EN 12056-5, Section 6.3 states, with respect to securing pipe systems: Non-anchored pipes must be secured and/or supported in such a manner that they cannot be disconnected during use. The arising reaction forces must be addressed.
For the specific application of rainwater, EN 12056-3, Section 7.4.6 stipulates: Internal Rainwater pipe shall be able to withstand the head of water likely to occur in the event of a blockage. The same precautions should be taken as a pipework liable to undergo accidental overloading: securing of bottom bends and joints with adequate grip collars or HP couplings.
Internal pressure resistance
Couplings are the link between the different parts of the system and ensure that the whole system is watertight. As the robust cast iron components can address any pressure hazard, then the couplings will be submitted to the strain.
In a drainage network, pressure resistance requirements are dependent on:
- The height of the water column between the considered point of the network and the first outlet located upstream. Generally speaking, we differentiate domestic wastewater networks from rainwater networks.
- The risk of accidental loading. The most frequent cases are due to occasional obstruction of downstream pipeline or flooding of the public network.
Gravity drainage systems generally operate without pressure
However, our systems are designed to withstand accidental overloading from occasional obstruction of downstream pipeline.
In terms of coupling requirements, we will differentiate between “standard pressure” couplings (SMU PAM, PAM Rapid and PAM R) and “high pressure” HP couplings. Recommendations will be based on their admissible pressure loads, type and height of network, and position in the network.
Download our couplings brochure
Download our couplings brochure for more information about the pressure resistance!