Homepage     Downloads Datasheets Technical publications Surcharges     Calculation Softwares     Quick Delivery Program Usipack® Abrapack®     Dreaming of Steel Video	Water industry   Potable water system     Stainless steel solutions for :   Potable water distribution: stainless steels have been used for a long time for potable water piping systems but their cost has been a limiting factor when compared to cast iron or carbon steel. The introduction of duplex grades like UR 35N or UR 45N has changed the situation. Indeed, the high mechanical properties of these grades make possible to reduce the wall thickness and their excellent corrosion resistance allows to get rid of any internal and external protection, leading to drastic cost savings of pipe fabrication and installation. The cost to performance ratio provided by UR 35N or UR 45N make these grades particularly competitive for buried pressure piping systems. Supermartensitic grades can be used in low aggressive environments.     Storage tanks: reduction of wall thickness and weight may be achieved by using UR 35N and UR 45N duplex grades. The absence of coating leads to shorter and simplified fabrication and erection. Stainless steel tanks provide a superior quality of potable water as a result of the extremely low level of metal leaching.     Potable water treatment: stainless steels type 304L, 316L and UR 35N are widely used in potable water treatment plants : piping, pumps, filters, chlorine/ozone mixing towers … Thanks to its better abrasion-corrosion resistance, UR 35N grade may be specified when high flow rates or turbulences are encountered.     Waste water treatment: a wide range of applications where stainless steels type 316L have been used successfully. Higher grades like 316LN or UR 45N may be selected in aggressive environments.     For most of these applications, duplex stainless steels are a reliable and value for money alternative to coated, galvanized steels, concrete and other materials. You can order publications about this topic from the Publication Download portal.    Back to top                          Water industry   Sea water     Sea water aggressiveness is the result of chloride ions and bacteriological activity.       Mo free stainless steels are not suitable for use in sea water. A range of high moly grades such as duplexes UR 45N, UR 47N+, UR 52N+ and super austenitics like UR B25, UR B46, UR B26 or UR B66 may be used, depending on parameters like temperature, geographical location, dissolved oxygen, water velocity, water contamination and vessel design.       You can order publications about this topic from the Publication Download portal.    Back to top                          Water industry   Desalination     Reverse osmosis process: even though temperature is low, the presence of oxygen, high pressure and the critical design of the cells and fitting systems favor crevice corrosion. In such conditions, 6Mo grades like UR B25 or UR B66 are required, the last one allowing to reduce the wall thickness of the equipments as a result of its higher mechanical properties.         Thermal processes: the very low oxygen content of brine explain why 316L has been used for years to build flash chambers despite the high temperature. Nevertheless, the resistance of this grade to stress corrosion cracking is critical and in case of leak or periodic plant shutdown, oxygen may enter the installation and 316L may pit within a very short period of time. The superior localized corrosion resistance provided by the duplex grade UR 45N combined to its much higher mechanical characteristics account for the rapid development of this grade in thermal desalination processes. This grade or higher alloyed duplex grades like UR 47N+ or UR 52N+ may be selected for sea water cooling systems.       316L, UR 45N and clad plates may be sourced from INDUSTEEL    Back to top