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Inerting Systems

 

Our equipment Inermatic optimize the consumption of inert gas, continuously analyzing the concentration of O2 and injecting automatically the necessary amount of inert gas.

Inerting is seen as an effective measure for prevention of explosions in the ATEX directives.

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Description of the components of our Inerting Adix Inermatic Systems

Control Unit: It provides a controller, which can be accessed by means of a touch screen where we can modify the inerting parameters, check alarm records and levels of O2. The control panel provides a range of 4 hours in the case of electrical fail.

Sample Analysis Unit: available with an O2 analyzer in different technologies: electrochemical, paramagnetic or of Zirconium oxide. The sample is taken in different points of the installation through aspiration by means of electric pump, controlling the sample flow in every moment and preparing it for its correct analysis.

Manifold: commanded by the control panel which automatically injects the inert gas in the desired area in order to carry out a continual adjustment of the desired O2 concentration. The system has pneumatically driven valves, pressure reducing valves, inert gas flow control, excess pressure valves and manual security bypass.

What is Inerting?

An explosion is a very fast combustion reaction, therefore in order to produce an explosion there must exist a combustible substance, a source of ignition and oxygen. By carrying out combustion trials with mixtures that contain decreasing amounts of oxygen, comes the point in which the flame no longer spreads. At that point, it is said that the minimum concentration of oxygen has been achieved, which can be therefore be used to define the minimum percentage of oxygen in the given mixture, capable of spreading the flame. Based on that information, it is inferred that explosion prevention measures can be obtained with a decrease in the concentration of oxygen, whatever that combustible concentration may be.

In order to reduce the concentration of oxygen normally all or part of the air can be substituted for nitrogen or other inert gasses or vapors like CO2, argon, and water vapor with certain limitations. In general combustible organic compounds do not spread the flame if the O2 content in the mixture of the organic compound, inert gas and air is less than approximately 10.5 and 13% v/v with nitrogen and carbon dioxide respectively as inert gasses.

In the case of employing an inerting method, it is very important to monitor the decrease of O2 content. This can be achieved by:

  • Operating a positive light pressure by means of an automatic supply of inert gas calibrated in pressure by a pressure regulator. Alarms must be installed in order to advise of the loss of pressure in the inert gas supply.
  • An oxygen analyzer also can be employed to regulate the flow of inert gas and maintain a safe level of oxygen.

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