An eductor is a device that uses the Venturi principle to introduce foam concentrate into the water stream. A metering valve is attached to an inlet to this chamber and when open allows the higher atmospheric pressure outside the chamber to push the foam concentrate into the chamber..
Subsequently, one may also ask, how far can a foam eductor be from the nozzle?
Using the 65% rule, distance from a 95 gpm eductor to a foam nozzle is a function of the back pressure. Fire ground hydraulics dictates that a 95 gpm foam stream will flow through 200 ft. of 1.75” hose with a 100 psi nozzle when 130 psi is at the supply end of the hose.
Furthermore, what is inline inductor? Inline Inductors. Inline Inductors are proportioners characterized by a self suction mechanism of venturi type: the foam concentrate, instead of being inside a bladder tank, is contained in a foam container directly connected to the Inline Inductor.
Also to know, what is the correct operating pressure for an inline foam eductor?
Standard inlet operating pressure is 200 psi on all eductors (1400 kPa/14 bar). There is a wide variety of foam concentrates.
How does a foam eductor work?
An eductor is a device that uses the Venturi principle to introduce foam concentrate into the water stream. A metering valve is attached to an inlet to this chamber and when open allows the higher atmospheric pressure outside the chamber to push the foam concentrate into the chamber.
Related Question Answers
How does foam extinguish flammable liquid fires?
Unlike other extinguishing agents - water, dry chemical, CO2, etc., a stable aqueous foam can extinguish a flammable or combustible liquid fire by the combined mechanisms of cooling, separating the flame/ignition source from the product surface, suppressing vapors and smothering.Why do firefighters use foam?
Firefighting foam is a foam used for fire suppression. Its role is to cool the fire and to coat the fuel, preventing its contact with oxygen, resulting in suppression of the combustion. The surfactants used must produce foam in concentration of less than 1%.Which is an advantage of compressed air foam?
Because foam is a more efficient extinguishing agent than water, it allows firefighters to extinguish the fire quicker, which decreases their exposure time. Second, the high energy of a CAF stream provides a longer reach, allowing firefighters to operate farther away from the incident in a safer location.What is the function of a standpipe system?
The function of a standpipe system is to provide: a water supply for interior attack lines. Standard operating procedures generally require that an attack line be connected to a standpipe system outlet: one floor below the fire floor.What is the benefit of class A foam?
Class A foam wets and cools fuels better than plain water. Class A foam concentrate serves two primary functions in improving water for structure fire attack, overhaul and exposure protection: Class A foam concentrate reduces water's surface tension so it can penetrate Class A fuel surfaces.How often do you test fire hose?
NFPA 25, Chapter 6, table 6.1. 1.2 states that fire hoses should be tested every 5/3 years, and they should be pressure-tested annually, in accordance with NFPA 1962 , Care, Use, Inspection, Service Testing, and Replacement of Fire Hose, Couplings, Nozzles, and Fire Hose Appliances revised in 2013.Which is an advantage of a smooth bore nozzle?
The smooth-bore will also maintain the same water pattern to reach the seat of the fire, keeping the pattern compact and getting large amounts of water at the seat of the fire.Which type of load is most commonly used for Preconnected attack lines?
The three most common hose loads for preconnected attack lines are the minuteman load, the flat load, and the triple- layer load.Which type of foam is effective on polar solvents?
Burning polar solvents require a special type foam for extinguishment because these liquids destroy the widely available proteinbase foams and aqueous film-forming foams (AFFF). In 1933, it was discovered that chemical foam could be modified to give an alcohol-resistant foam.What is the primary way that water extinguishes fire?
The primary way water extinguishes fire is by: Absorbing heat. The energy required to raise the temperature of a substance by one degree is called: .What type of foam is made from animal byproducts?
Protein-based foam Protein foams are made from either animal blood and byproducts, from soybeans, or from a combination of both. 
