FAQs – General

Alta Expansión - High Expansión

What volume of foam give these generators?

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.

Where should they be located in the installation?

Always above the risk to be flooded.

What coefficient subtract the effect of “flattening” of the foam due to the height?

According to the NFPA-11-A, the volume of foam produced by the generator, to be discounted 15%, by that coefficient.

Is it appropriate for the back of the generator is outside the risk?

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.

How is that achieved eliminates foam?

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 expansiónLow expansionBas foisonnement

Baja Expansión - Low Expansion - Bas foisonnement

What area does this sprinkler low expansion foam?

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.

What volume of foam gives?

· 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 - Tank d’émulseur atmospherique

Do these proportioning may work in a different position to the horizontal?

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.

Why is there a diver for the tank filler tube?

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.

What is better to have full or in any position the?

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 tube, which are connected the suction elements why not get to the bottom of the tank?

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

Does every few years have been for periodic pressure testing tanks membrane?

Membrane tanks are pressure vessels in accordance with Royal Decree 2060/2008 of 12 December, approving the Regulation on pressure equipment and complementary technical instructions. Periodic testing and pressure vessel are (s / RD 2060/2008):faq mxc-i


A membrane tank should it be permanently pressurized?

Sabo Española strongly that the membrane tank is pressurized with the following configuration is recommended:
faq mxc-i
This can prevent the presence of air (in case the tank is not pressurized), to put the system into operation, the membrane can break.

How should load the 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.

What if the installation operates a certain time and the tank empty?

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.

What the two valves at the bottom generatrix of proportioning used?

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.

What is the drop of the membrane tank?

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

As used the Faqs Sabo Española

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