Table of Contents
How do you calculate water velocity?
Find the surface water velocity (in m/s) by dividing the distance from AA to BB (in this example, 10 m) by the average time (in seconds) and multiply this result by 0.85 (a correction factor) to estimate the average water velocity of the stream. Average water velocity = 0.5 m/s x 0.85 = 0.425 m/s.
What is fire hose nozzle?
in fire fighting, a device for generating and directing a stream of water, foam, powder, or other fire-extinguishing substance. Fire-hose nozzles can generate narrow or dispersed streams, and they make it possible to stop the flow without shutting off the supply. …
How does a water nozzle work?
Single-fluid or hydraulic spray nozzles utilize the kinetic energy imparted to the liquid to break it up into droplets. This most widely used type of spray nozzle is more energy efficient at producing surface area than most other types.
How do you calculate the speed of water flow?
Distance (or length) divided by Time equals Rate. Rate is the flow rate or speed of the water, using the unit “meters per second.
How do you calculate flow through a hose?
Flow rate is the volume of fluid per unit time flowing past a point through the area A. Here the shaded cylinder of fluid flows past point P in a uniform pipe in time t. The volume of the cylinder is Ad and the average velocity is ¯¯¯v=d/t v ¯ = d / t so that the flow rate is Q=Ad/t=A¯¯¯v Q = Ad / t = A v ¯ .
What size is a fire hose?
The standard three sizes of hose lines are 1½, 1¾ and 2½ inch. Depending on the size and severity of the fire, hose line requirements vary to get the job done efficiently.
How do you use a water hose nozzle?
To use your hose, you control the water flow by squeezing the trigger on the grip and directing the end of the nozzle where you want the jet of water to go. The trigger will often control how far the water stream goes and how much pressure it has.