Membrane tube diffuser and PRO₂AIR Pre-PUR^® membrane diffuser tube promote considerable energy savings. Standard EPDM tube diffuser materials are less durable and efficient. NORRES Schlauchtechnik benefits from the further development of product qualities in the field of environmental technology: The PRO₂AIR Pre-PUR^® Membrane tube diffuser and the NORRES PRO₂AIR Pre-PUR^® membrane diffuser tube are more effecient to use due to lower pressure loss. Both products offer significant energy savings thanks to improved Pre-PUR^® raw material quality.

Initial situation and problems of previously used solutions

Other tube diffusers currently available in the market tend to form a kink during intermittent operation; This can result in permanent kinking can be a primary cause of damage with long term use.  If damage of this kind occurs, sludge can get into the system; significantly more air escapes from a defective or ruptured diffuser than from an intact one. There is a rapid decrease in oxygenation, leading to reduced oxygen transfer efficiency and impacting the diffuser's reliability. The poor durability of previously used materials was previously attempted to be improved by asymmetrical support body, which is also not an optimal and at the same time an expensive solution. With other tube diffusers, leaching of the plasticizer in the raw material, may occur during use and over time leads to a proportionally increasing pressure loss. And finally: High energy consumption results from high pressure loss and low oxygen yield.

The solution: Pre-PUR^®

Thanks to the use of advanced Pre-PUR^® quality, the PRO₂AIR Pre-PUR^® diffuser membrane and the PRO₂AIR Pre-PUR^® membrane tube diffuser differ in significantly lower pressure loss and considerable energy efficiency. Both products are 100% free of softeners and thus permanently elastic. An embrittlement or hardening of the membrane does not take place. They are due to special stabilizers chemically, hydrolytically and thermally stable. The membrane material has a very good resistance to municipal and industrial waste water according to the current leaflet DWA-M115. Thanks to the premium polyurethane, the membrane tube diffuser as well as the mebrane diffuser tube are convincing due to their high tensile and tear resistance, are durable and can be subjected to high loads.
The new NORRES PRO₂AIR Pre-PUR^® membrane tube diffusers resist permanent kinking better than ever before. In a De Mattia test, based on DIN ISO 132, PRO₂AIR Pre-PUR^® membrane tube diffusers achieved up to four times better resistance to permanent kinking than other materials. In addition, both products have an optimized slit perforation. The membrane tube diffuser is perforated using a specially developed technique that assures optimal quality consistency. This guarantees a uniform bubble pattern and optimal oxygenation efficiency across the complete specific air flow range. It goes without saying that the new PRO₂AIR Pre-PUR^® is permanently resistant to microbial attack and hydrolysis, and the minimal maintenance requirement is a further point in its favour.