Which nozzle pressure is a smoothbore nozzle design to operate?
Which nozzle pressure is a smoothbore nozzle design to operate?
Therefore, if the common 150-gpm nozzle is being used, reducing the flow rate is not an option. Reducing the nozzle pressure is an option and is being applied as U.S. fire departments are switching from high-pressure fog nozzles (100 psi) to smooth bore nozzles or low-pressure fog nozzle (50-75 psi).Feb 29, 2020
How do you calculate nozzle pressure?
https://www.youtube.com/watch?v=Xpq5dyrpz-8
How do you calculate gpm on a smooth bore nozzle?
There is a simple way of estimating the square of a fractional number close to one. For example, (1 1/4)2 is equal to 1.25 x 1.25, which is approximately (1.250. 25) X (1.25 + 0.25) = (1.0) x (1.5) = 1.5. A 1 1/4-inch nozzle tip will therefore flow about 200 gpm x 1.5 = 300 gpm at 50 psi.Jan 10, 1990
Which advantage does a fog stream nozzle have over a smooth bore nozzle?
By doing so, its stream achieves a greater surface area, and thus a greater rate of heat absorption, which, when compared to that of a smoothbore nozzle, speeds its transformation into the steam that smothers the fire by displacing its oxygen.
What are fog nozzles used for?
Fog nozzles are designed to provide a dispersed stream to protect personnel. Teeth are provided to break up the water into smaller droplets for better heat absorption and steam effect.
What is the difference between a constant Gallonage nozzle and an adjustable Gallonage nozzle?
The volume control for a constant-gallonage nozzle is similar in principle to that of a fixed orifice smooth bore nozzle. The adjustable-gallonage nozzle is a modified constant gallonage nozzle with several orifice sizes that the nozzle operator can manually select.Oct 30, 2015
What is a straight stream nozzle?
Water or fire retardant projected directly from the nozzle (as contrasted with a fog or spray cone), provided by a solid stream orifice or by adjusting a fog jet into a straight stream pattern.
What are the two types of fire nozzles?
- Smooth-Bore Nozzles. Smooth-bore nozzles, a type of manual nozzle, have a simple, cylindrical design that doesn't consist of any internal parts to facilitate the control of gallonage or pressure. ...
- Constant Gallonage Spray Nozzles. ...
- Automatic Spray Nozzles.
How many types of fire nozzles are there?
four
What is a fire nozzle?
in fire fighting, a device for generating and directing a stream of water, foam, powder, or other fire-extinguishing substance. The simplest type of nozzle is a tube with a terminal attachment that adjusts the stream.