What is inline eductor?
WILLIAMS FIRE & HAZARD CONTROL® (WILLIAMS) Inline Foam Eductors introduce a metered flow of foam concentrate into a pressurized water stream. These Venturi-Type foam proportioners are utilized in conjunction with matched, constant-flow discharge nozzles/devices where adequate water pressure is available.
How far should 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.
Which principle is used in foam eductor?
Foam Eductor is a device that uses the venturi principle to introduce a proportionate amount of liquid concentrateinto a water stream. This venturi principle is used in the foam Eductors to induce foam or other liquid agents into a fire control stream.
What pressure do you pump a foam eductor?
Eductors are typically pumped with a 200-psi inlet pressure. This is due to the high friction loss, roughly 30 percent, through the small Venturi area. The pick-up tube can be placed in a foam bucket or attached to a foam tank supply.
What is foam eductor?
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.
What is a foam eductor and how does it work?
What do you pump a foam inductor at?
What percentage of finished foam is water?
Since foam contains 94-97% water, it is not safe for use on this type of fire. In some cases, foam concentrate is even more conductive than water. Class C fires can be extinguished using nonconductive extinguishing agents such as a dry chemical, carbon dioxide (CO2), or halon.
What is the function of eductor?
An Eductor is a device that works on the venturi effect for pump operation. It is a type of jet pump used to pump out liquid/sediments where the suction head is too low for the normal pump to operate.
How does a foam eductor work?
An eductor is a device that uses the Venturi principle to introduce foam concentrate into the water stream. Water coming in the inlet of the eductor is directed through a tapered section and out through a small orifice (the Venturi) into a larger chamber thus creating a low pressure area within the chamber.
What is Afff made of?
Synthetic foams Aqueous film forming foams (AFFF) are water-based and frequently contain hydrocarbon-based surfactant such as sodium alkyl sulfate, and fluorosurfactant, such as fluorotelomers, perfluorooctanoic acid (PFOA), or perfluorooctanesulfonic acid (PFOS).
How does the in line foam eductor meter work?
In line foam eductors have a metering head with an easy-to-read knob for use with Class A, B and AR-AFFF foam at a variety of percentages. The meter head is equipped with a unique back flush push-button for fast and easy cleaning right on the scene, and is secured to the eductor body with a rugged disconnect.
What’s the flow rate of a foam eductor?
This light weight inline Foam Eductor operates at low pressure 100 PSI. Excellent for use in plants, portable pumps or other low water pressure applications. Variable concentrate settings from 0.5% to 6%. Clear pick up tube with quick Storz connection and stainless steel wand. Flow ranges 60 and 125 GPM.
How much water to flush out foam eductors?
Educt at least 10-15 gallons of fresh clean water to flush out all of the foam concentrate from the metering valve. Visually inspect the educator, metering valve, pick-up hose, and pick-up wand for damage. Repair or replace as needed.
What causes a foam eductor to stop picking up?
Repair or replace as needed. COMMON EDUCTOR PROBLEM CHECK LIST Anything that causes excessive back pressure on the downstream side of the eductor can cause the foam pick-up rate of the eductor to slow or stop altogether. Below are some of the common problems.