Industrial Fans and the Atex Directive

Concerning Industrial Fans, you cannot help dealing with ATEX, sooner or later.

This acronym (made up by the first letters of the words ATmosphéres and EXplosibles) identifies two different directives of the European Community:

  • No. 2014/34/UE, that became law on the 30th March 2014, which regulates the devices and machinery working in potentially explosive atmospheres, and is directed to manufactures of devices destined to be used around potentially explosive atmospheres; the manufactures must certify these products: the directive before, Directive No. 94/9/CE, has been canceled by this new one, starting from the 20th April 2016;
  • la 99/92/CE, which is directed to the users of certified devices and concerns safety and health of the workers in potentially explosive atmospheres: it is implemented in backgrounds where explosions can actually occur.

The ATEX Regulations indicate the essential requirements that the devices must have concerning safety and health: you can easily realize that respecting these requirements is essential for industrial fans that are installed in backgrounds where explosions can potentially occur.

The main suppliers of industrial ventilation systems, including Euroventilatori International, supply certified ATEX fans equipped with all necessary technical documentation.

Before installing an industrial fan you must evaluate the risks concerning the background where the fan is going to work. However, the choice of installing an industrial fan that meets the requirements of the ATEX directive is completely up to the Customer.

In this case, a supplier like Euroventilatori International can best assist and advise the Customer, thanks to its staff of highly qualified technical experts.

Atex zone table

The ATEX zones chart

The fans that meet the requirements of the ATEX directive are built following some particular expedients in order to avoid sparks caused by the friction between the spinning part and the fix one; there are different parts and characteristics that are accurately examined before assembling the fan.

Dust zone table

Depending on the background , the ATEX directive indicates the Fan and Motor Type

Furthermore, once the devices are working, accurately planning the maintenance and the cleaning is of fundamental importance, depending on the type of background where the fan works and depending on the materials that are eventually driven in it: dusts are potentially dangerous, because they set down even where mobile and fixed parts are closer and can therefore cause sparks.

Euroventilatori International provides, together with its own certified ATEX fans, all certifications and technical manuals which are necessary in order to best use the device; it can also assist its Customers in extremely short times, through the intervention of its highly qualified staff.

LiveCurve: advanced features to choose an industrial fan

The LiveCurve software performed by Euroventilatori International allows the user to simulate the aeraulic curves for the range of fans that our company produces, in order to be able to make an initial selection of the fan types which are most suitable for his own needs.

livecurve interface and work area

LiveCurve Interface: you can see the working point indicated on the graph and the position of the panel for the selection of air flow and pressure values.

But what makes Livecurve the most advanced software for the simulation of air flow/pressure curves on the market?

As well as the basic features, which have been described in the last post, Livecurve allows the user to simulate and instantly make comparisons among many curves that represent the relation between the two parameters, speeding up the selection process of the most suitable industrial fan.
Let’s get into the possibilities offered by this appliance and let’s take a closer look at some advanced features of this interface: the most captivating element is obviously the Livecurve graphic on the right.
It provides the immediate representation of the air flow/pressure graph, which is developed according to the working point that was selected earlier choosing the required values.
A little orange rectangle on the graph indicates the working point, the point on the graph located by the values you have selected. This point is part of the curve which refers to the chosen fan type, as indicated in the list on the left below on the display.
If we choose a different Fan Type, we will see how the curve changes, since every fan has its own specific curve. Otherwise, the working point will always be the same we have chosen, even if it will be placed differently on the curve we see.

On the Data Panel, on the right, you can find the explanation and summary of the values of air flow, pressure (total, static and dynamic), rotation speed, power (kW), efficiency, noise level and load (static and dynamic) that refer to the working point you have selected.
That is a very important and extremely useful feature: if you move the mouse over the curve and you scroll it, you will see that the information reported on the Data chart, which summarizes all data on the right, will consequently change. This way you can see all the values concerning the relation/ratio of air flow/pressure which refer to the fan type you are currently analyzing.
If you click on a point of the curve, a temporary working point will be set: changing the fan type, it will be maintained for the air flow value and we will immediately obtain the corresponding pressure value.
To identify the conditions where the chosen fan type will work, LiveCurve provides the Utilization Area right above the graph: here you can select the modality (inlet or outlet), change the altitude and the temperature where the fan will work or switch to the inverter mode, where you can explore the graph to find the working point that better fits your needs.
If you want to see also the curves that represent the power and the performance, you only need to choose the related options on the graph panel, where you can even change the units of measurement and the type of visualization, choosing between static curve or dynamic pressure curve, and between logarithmic and linear scale.
Livecurve is an original simulator which allows the user to choose the industrial fan which better fits his needs and to make an initial selection among the items: however it is very important that plant engineers and technical experts analyze each specific case, in order to adapt the features, if necessary, to the customer’s needs and to create this way a real custom-made machinery.

Here is the Video Tutorial on the Euroventilatori International Youtube channel:

Backward blades, forward blades, straight blades to industrial fans

industrial fans bladesIn the post “Industrial fans explained to non insiders / laymen” we introduced the distinction between axial and radial or centrifugal fans.  In this post we will exclusively deal with radial fans, and in particular, with the blades included in the impeller.
You should keep in mind that in radial fans, the air (or the fluid) meets the impeller in axial direction and leaves it perpendicularly  to the axis of the fan.
In this context, blades are fundamental. They are divided into three categories:

  • Backward blades: in this type of impeller, the fluid is driven by the convex part of the blades (the back).
  • Forward blades: in this type of impeller, the fluid is driven by the concave part of the blades (the front).
  • Straight blades: impeller where the fluid is processed  indistinctly with the back or front side

Concerning the performance, using negative blades involves a lower absorbed power and therefore a lower energy consumption: they typically offer an higher performance.  In the same way, at equal range and size, the forward curved fan offers an higher performance concerning pressure, but also an higher absorbed power, and therefore an higher energy consumption.