FAQs – Expansion

Low Expansion

Bladder Tank

FAQs, 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.

Medium Expansion


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.

High Expansion
    • Español
    • English
    • Français
    • Ruso