foam generating equipment combines water with foam concentrate to produce finished fire fighting foam. The proportioning and application of the foam is essential to ensure proper fire extinguishment. The NFPA and EN standards specify the ratio of foam concentrate to water needed for an effective fire suppression. This ratio varies by type of fuel (hydrocarbons or polar solvent/alcohol) and is described as either 1 x 3 (1% water, 3% foam) or 1 x 5 (15% water, 5% foam).

The proportioning system typically utilizes an atmospheric storage tank with a positive displacement water motor powered pump. The pump is sized to accommodate the specific foam concentrate and can be operated on a variety of power sources including electric, diesel or gas engines.

In operation, the foam generator is controlled by a variable spray nozzle 2 which may be set to deliver a low, medium or high expansion foam. The nozzle is adjusted to direct the foam solution stream over the surface of a fixed or adjustable screen. As the solution comes into contact with the screen, it expands into millions of tiny stable bubbles that separate the fuel from oxygen, providing immediate fire extinguishment.

The DF130 mobile foam unit is designed and built for one man operation. It is an ideal solution for protecting oil and loading terminals, paint and solvent stores, boiler and engine rooms and diked flammable liquid storage areas. Delta also offers a full range of high expansion foam generators for use as part of a fixed installation.