Alta Expansión - High Expansión
The volume of foam produced is the product of the flow of water mixed with foam that comes, by the expansion ratio.
· In the case of GAE-250, at a pressure of 4 bar is:
23x 816 = 190 128 l / min.
· For the GAE 400, at a pressure of 4 bar:
378 x 820 = 309 960 l / min.
Always above the risk to be flooded.
According to the NFPA-11-A, the volume of foam produced by the generator, to be discounted 15%, by that coefficient.
For relatively small enclosures, in case of a real fire, hot air, mixed with aerosols, dust, etc., tends to rise, and since generators should be located at the top of the premises is to occur if making a bubble of hot air foam, the expansion force of the air is greater than the surface tension of the microfilm and the foam breaks, bursting so a much smaller amount of foam is achieved. It is therefore desirable that the foam forms with clean air at room temperature, it is necessary to study the location of generators and try to get most fulfilling this condition.
About time and influences the room temperature, will gradually bursting bubbles, producing clear, decanting the water into the ground where it can be removed more easily.
Baja Expansión - Low Expansion
It depends on the height of your location, but for a situation over 3m., Relative to ground level deck area of 9 square meters, although the projection is circular.
· The amount of foam produced is the product of the flow, by the expansion ratio.
· For this model, UAS, the flow rate at 3 bars, is 70 l / min.
· The expansion ratio is from 1 to 6 (depending on the type of foam concentrate), so the volume of foam produced is:
· 70 x 6 = 420 l / min of foam.
Deposito Espumógeno Atmosféricos - Foam Concentrate Tank
The proportioning venturimétricos have to work horizontally, which is its normal position, not vertical or inclined.
In the case of the proportioning mod. SE-Z-ES and SE, the suction will be at the top while in the case where the mod. SE-PRO, the vacuum remains at the bottom.
To prevent foam formation when filling , since otherwise , if the foam is poured freely by dropping a single orifice from a height a large amount of foam which would prevent filling in a single operation would occur on deposit . With the dip tube is achieved by filling the foam from the bottom , so that this problem does not occur.
The foam is slightly evaporable, if the tank is not full at all, said vapors just rusting tank wall, said oxidation is slow, because inside the tank is painted in epoxy, therefore and for greater longevity of the foam, in order to reduce as much as possible to the surface in contact with the atmosphere, an atmospheric tank containing foam is much better that it is always fully booked.
The suction tube is just biased and not in contact with the bottom, but reaches about 50 mm from it, this is to prevent suction positos, gels, etc. oxide plates, which eventually are deposited in the tank bottom.
The ability of the same, when constructed, is already taken into account this “loss” of volume.
Depósitos de Membrana - Bladder Tank
Each reservoir, with the foam inside the membrane, is provided with technical sheets for the filling process.
You must explicitly follow these instructions in order to perform a correct filling. Otherwise you run the risk of seriously damaging the membrane.
As the operating time of the installation takes place, the inside of the membrane is emptied and the space between the membrane and the inner wall of the tank is filled with water in the same amount as foam exits the interior of the membrane.
Where appropriate a very prolonged operation would empty the tank of foam concentrate and water-filled encounter.
By proportioning only pass water because he can not leave foam inside the tank, by exhaustion, and so until the installation will not stop ie it will be pulling water, no foam mixture.
They have two functions, draw the line foam and sampling of water mixed with foam, for observation by refractometer or conductivity of the mixing ratio.
Depends primarily on the flow and diameter of each proportioner is designed for a maximum flow rate – minimum flow between a chosen percentage correct dosage, usually 3% or 6% is guaranteed. The more flow rate the pressure drop. Normally a maximum flow for a given diameter of proportioning, the maximum pressure drop is between 0.9 and 1.1 bars.
In our catalog you will see the pressure drop for each proportioning diameter, depending on the desired flow rate.
Generales - General
Below we show a relation of frequently asked questions about the general aspects of the web.
One of the most freequentes doubt this site is how I buy.
1. On the internet
2. By phone
3. In our commercial business, contact a commercial