Greater efficiency
- Perfect water tightness: Guaranteed for life. Protection against possible increases in the groundwater level is ensured; the quality of the gaskets is guaranteed to withstand internal and external pressures of up to 0.5 bar.
- Resistance against every type of attack: Impenetrable even when they are subjected to the action of the chemical agents present in the ground or in waste water.
- Strength and flexibility: The considerable adaptability to any ground and its natural subsidence prevents and reduces the possibility of failure; the stability criteria comply with the severest international earthquake standards.
Reduced costs
- Easy installation: The significantly lower weight of the elements (on average 30-40 kg) enables simple and fast installation. Transport costs are lower; it is not necessary to use heavy machines.
- Adaptability: The manholes are designed so that they can be connected to every type of pipe; it is also possible to connect a pipe long after installation, as only 100% virgin HDPE is used.
- Negligible maintenance costs: Chemical resistance and durable seal. Once installed, HDPE manholes do not require maintenance for decades.
Lower reliability
- Insufficient seal: The manhole is critical for the quality of the sewerage system. Accredited studies confirm that more than 50% of the concrete manholes installed are not watertight; this causes contamination of the flow or, worse, pollution.
- Resistance not guaranteed: Internal corrosion phenomena are possible; chemical agents may damage the structures.
- Short-term strength: Modifications, vibrations, ground subsidence and significant temperature variations may result in cracks and splits causing spills or infiltrations.
High and unpredictable costs
- Difficult installation: 1 meter high manholes of 1 meter diameter may weight up to 1 ton. Even if made from several elements , when lifted singularly, they still have a considerable weight. The transport and handling difficulties, the installation time as well as the safety requirements increase and with these the overall costs.
- Continuous maintenance: Subsequent interventions are made necessary by the use of a material, which does not guarantee the required water tightness, resistance and strength qualities. Over time, there is inevitably an increase in the need for both routine and major unforeseen maintenance operations.
