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.
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 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.
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.
A membrane tank should it be permanently pressurized?
Sabo Española strongly that the membrane tank is pressurized with the following configuration is recommended:
This can prevent the presence of air (in case the tank is not pressurized), to put the system into operation, the membrane can break.
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):