Compressed air foam technology
AssigneeSogepi S.A.
InventorsTino Krüger, Günter Dorau
Life of this patent
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Abstract
The method is for continuously producing compressed-air foam, notably for fire fighting or for decontamining, by supplying both compressed air and a mixture of water and at least a foaming agent to a foaming chamber (5) outputting foam to a nozzle (9) via a pipe (8). The mixture of foam agent and water and the compressed air are each continuously supplied to the foaming chamber (5) at a constant pressure and at a constant volume flow rate, e.g. by means of pressure regulators (1, 2) and of flow rate regulators (3, 4). The foam pressure is regulated at the outlet of the foaming chamber (5) for maintaining the foam mixing pressure in the foaming chamber constant, preferably by a self-operating valve (6). The foaming chamber can advantageously be of a static type comprising sieves.
Claims17
A method for continuously producing compressed-gas foam for fire-fighting or for decontamining by supplying both compressed gas and a mixture of liquid and at least a foam agent to a foaming chamber having an outlet for outputting foam, comprising the steps of:
- continuously supplying the mixture of foam agent and liquid to the foaming chamber at a first constant pressure and at a first constant volume flow rate;
- continuously supplying the compressed gas to the foaming chamber at a second constant pressure and at a second constant volume flow rate;
- and
- regulating, in an open-loop control, the foam pressure at the outlet of the foaming chamber for maintaining the foam mixing pressure in the foaming chamber constant by applying a target gas pressure to a self-operating valve connected to the outlet of the foaming chamber, wherein the self-operating valve is adapted to regulate the foam pressure at the outlet of the foaming chamber so as to equal the target gas pressure.
A method for continuously producing compressed-air foam for fire-fighting or for decontamining by supplying both compressed air and a mixture of water and at least a foam agent to a foaming chamber having an outlet for outputting foam, comprising the steps of:
- continuously supplying the mixture of foam agent and water to the foaming chamber at a first constant pressure and at a first constant volume flow rate;
- continuously supplying the compressed air to the foaming chamber at a second constant pressure and at a second constant volume flow rate;
- and
- regulating, in an open-loop control, the foam pressure at the outlet of the foaming chamber for maintaining the foam mixing pressure in the foaming chamber constant by applying a target gas pressure to a self-operating valve connected to the outlet of the foaming chamber, wherein the self-operating valve is adapted to regulate the foam pressure at the outlet of the foaming chamber so as to equal the target gas pressure.
A method for continuously producing compressed-air foam for fire-fighting or for decontamining by supplying both compressed air and a mixture of water and at least a foam agent to a foaming chamber having an outlet for outputting foam, comprising the steps of:
- continuously supplying the mixture of foam agent and water to the foaming chamber at a first constant pressure and at a first constant volume flow rate;
- continuously supplying the compressed air to the foaming chamber at a second constant pressure and at a second constant volume flow rate;
- and
- regulating, in an open-loop control, the foam pressure at the outlet of the foaming chamber for maintaining the foam mixing pressure in the foaming chamber constant by applying a target gas pressure to a self-operating valve connected to the outlet of the foaming chamber, wherein the self-operating valve is adapted to regulate the foam pressure at the outlet of the foaming chamber so as to equal the target gas pressure, the self-operating valve being a pinch valve.
Dependencies are inferred from the claim text.