The foam chamber is typically used to apply low-expansion
foam solution onto the surface of liquids stored in storage
tanks, quickly creating a secure foam blanket. The most
common structures these are installed into are vertical fixed
(cone) roof storage tanks, either with or without internal
Systems are usually designed to NFPA 11 (Standard for Low-,
Medium-, and High-Expansion Foam), the foam solution is
applied across the complete surface area of the liquid.
Foam chambers are defined by NFPA 11 as Type II Discharge
Outlets for delivering foam to the surface of a flammable
liquid. They can be used in conjunction with inline foam
inductors, balanced-pressure foam proportioning systems,
bladder tank proportioners or foam tenders.
The Foamtech low-expansion foam handline nozzles can be
used with all low-expansion foam concentrates, such as
fluoroprotein (FP), aqueous film-forming foam (AFFF),
alcohol resistant aqueous film-forming foam AR-AFFF) and
Class A concentrates.
These portable, air-aspirating nozzles can also be used to
extinguish a variety of flammable liquid fires using Foamer
Class B foam concentrates.
Typical applications include municipal fire departments,
Crash-Fire-Rescue (CFR) vehicles; or for handline
applications around tank farms, loading racks, aircraft
hangars and chemical plants.
When using SILV-EX PLUS Class A foam, an effective
blanketing foam is produced. This blanketing foam is ideal
for structural fires and other deep-seated risks involving
tyres, rolled paper, baled cotton and coal bunkers.
The advantage of low-expansion foam compared to medium-
expansion is the greater stream range and superior cooling
effect achieved by the higher water content.
Foam generators are designed to expand foam solution into
millions of tiny bubbles in which the solution is expanded in
volume to a range exceeding 200:1.
The extinguishing effectiveness of the Foamtech HX generator
(FCH*-250) is achieved via a combination of the following:
Free air movement essential for continued combustion
Transition to steam of the water content of the foam
solution dilutes the oxygen concentration, achieving a
level below which combustion cannot be supported.
Reduced surface tension of the foam solution draining
from the expanded foam penetrates the Class A
materials, extinguishing deep-seated fires.
Foam solution lowers the temperature below thecombustion point or auto-ignition temperature of
Class A and B fuels.
The insulating and heat-reflecting properties of the
foam blanket provide a heat shield preventing fire
spread and extinguishes deep-seated fires.