When considering chemical treatment programs for closed loop systems, ScaleAwayA900 is a Sodium Nitrite based corrosion inhibitor and is an economical and effective treatment option.

Sodium Nitrite has been used as a corrosion inhibitor for closed loop water systems for many years. Sodium Nitrite functions as an anodic corrosion inhibitor. Nitrite works to form a protective gamma iron oxide film on a metal surface. This layer is formed by the reaction of nitrite and dissolved oxygen and then kept in repair by the nitrite alone. Nitrite is not consumed to any practical extent since little is needed to form this film. It is this film that protects the metal surface from corrosive attack. Nitrite consumption is directly influenced by oxygen entering the closed loop system by the addition of oxygenated make-up water.

Sodium Nitrite offers excellent corrosion protection for ferrous metals. Nitrite functions best when used in the pH range 10.5 - 13.5 and formulations for closed systems often make use of borate buffers. In addition to buffering the pH into the desired range, borates promote passivation by facilitating the absorption of oxygen, and also provide some microbiological control. The concentration of nitrite required for inhibition increase with temperature.

Sodium Nitrite is an oxidizing agent and is not compatible with reducing agents such as sodium sulphite. It also has reduced effectiveness when chlorides and sulphides are present in the water, unless the dosage of nitrite is increased. In general, maintain no less than 2000 ppm of sodium nitrite (preferably 3000 ppm), keeping levels of at least 850 ppm above the total concentration of chloride and sublet present in the closed loop system.

The reactions that affect nitrite are controlled by varying forms of bacteria. Some fungi and other forms of microorganisms have the ability to react with other forms of Nitrogen. The nitrite ion is included either as a primary food source or as an intermediate food source in a number of autotrophic reactions.

The reactions that affect nitrite are controlled by varying forms of bacteria that use nitrite as food. Some fungi and other forms of microorganisms have the ability to react with other forms of Nitrogen. The nitrite ion is included either as a primary food source or as an intermediate food source in a number of autotrophic reactions. Within the context of the Nitrogen Cycle there are three microbiological processes that are relevant to the use of Sodium Nitrite as a corrosion inhibitor closed recirculating water systems. This is where ScaleAwayA171 is used as a primary biocide.

The use of Sodium Nitrite is a closed system as a corrosion inhibitor at levels 2000 - 3000 ppm of nitrite offers an excellent source of nutrition for the three processes described above. Most closed recirculating water systems will have areas of anaerobic and aerobic conditions. Therefore, it is possible to have more than one process operating within the same system. At the present time, there are no field tests available to determine either qualitatively or quantitatively if these processes are occurring.

ScaleAwayA171 is a combination broad spectrum biocide and algaecide for use in cooling water systems where bacteria and biofilm are expected to be present. It provides microorganism control and clean systems.

ScaleAwayA171 is a Gluteraldehyde based biocide and is normally dosed rate: 500 - 1000 ppm in system depending on degree of fouling. ScaleAwayA171 can be dosed continuously or slug dosed. Can be dosed directly from the drum or other suitable container. May be dosed full strength or diluted to any convenient concentration.

ScaleAwayA171 rapidly kills algae, bacteria, viruses, fungi, moulds and other microorganisms.

SERVICE AND MAINTENANCE PLAN
ScaleAway offers a maintenance plan which includes maintaining adequate anti-scalant and corrosion inhibitor levels, keeping equipment clean and ensuring optimum efficiency of the industrial water chiller unit and or closed loop piping reticulation at all times.

Effects of Oxygen Corrosion in Closed Loop Cooling Systems
ScaleAwayA900 for Steel and Copper coils
ScaleAwayA908 for Aluminium coils
ScaleAwayA171 Biocide and Algaecide for Cooling Water systems