What is the diameter of the fire hose nozzle?
1.125 in
What size are fire hoses?
There are three standard-sized hoselines that the fire service uses as a front line attack line: 1½, 1¾ and 2½ inch. The remaining situations might involve large master streams or deck guns. The key with selecting the correct size line is quite simply getting the right amount of water on the fire.
What are the two types of fire nozzles?
There are five basic nozzle types:
- the solid bore.
- the single gallonage (sometimes called variable pressure/variable flow)
- the adjustable gallonage.
- the automatic or constant pressure.
How does a fire hose nozzle work?
Fog nozzles produce a cone-shaped stream of small water droplets. These droplets can more easily be converted into steam, which takes heat from the surrounding air and can even be used to push hot air out of a room. Straight streams discharge water in the shape of a column.
How much force does it take to hold a fire hose?
The usual working pressure of a firehose can vary between 8 and 20 bar (800 and 2,000 kPa; 116 and 290 psi) while per the NFPA 1961 Fire Hose Standard, its bursting pressure is in excess of 110 bar. (11,000kPa; 1600psi) Hose is one of the basic, essential pieces of fire-fighting equipment.
How far does a fire hose shoot?
75 to 100 feet
How much PSI does a fire hydrant have?
Fire hydrants are flow-tested at a residual pressure of 20 psi; therefore, firefighters should understand the typical flow rates of fire hydrants at that pressure.
Why is spare fire hose rolled for storage?
Why is spare fire hose rolled for storage? A) Rolling provides maximum protection to the outer covering of the hose.
How many gallons per minute does a fire hose use?
500 gallons
What is the minimum flow rate for a fire hydrant?
500 gpm
How many GPM can a fire hydrant flow?
| CLASS | Hydrants that on individual test usually have a flow capacity of: |
|---|---|
| CLASS AA | 1,500 gpm or greater |
| CLASS A | 1,000 gpm or greater |
| CLASS B | 500 to 1,000 gpm |
| CLASS C | <500 gpm |
How much does 100 feet of fire hose weigh?
110 pounds
How much does 50 feet of fire hose weigh?
Table 3.2 Comparative Diameters and Weights (100-foot lengths) of Coupled Fire Hose
| Type of Hose | FS SPEC | Max Total Weight (lb) |
|---|---|---|
| High pressure, reel (50 ft only) | 5100-185 | 38.4 |
| Cotton-synthetic jacket, lined | 5100-186 | 56.4 |
| Synthetic jacket, lined | 5100-187 | 43.4 |
| Cotton-synthetic jacket, lined | 5100-186 | 103.9 |
How do you measure a fire hose?
How to determine which size hose you might have.
- Check the female coupling for numbers like 1.5 or 2.5.
- Measure the inside diameter of the male coupling. Do not measure the female coupling.
- Check for numbers stenciled on the hoses.
- Do not measure the hose laying flat.
What is the friction loss in 5 inch fire hose?
0.08
How do you calculate friction loss in a fire hose?
friction loss = friction loss coefficient * ( flow rate / 100) 2 * hose length /100. FL = C* (Q/100)2 *L/100.
What is the friction loss in a fire hose?
Friction loss is the resulting resistance as water (fluid) moves along the inside wall of either a hose, pipe, or hose fittings. Points to remember about friction loss: Friction loss increases as flow (gpm) increases.
How do you calculate friction loss on a fire hose?
Consider the equation: FL = c × (gpm/100)2 × L/100. The “c” term is the so-called friction loss factor and measures the pressure loss per 100 feet. This is multiplied by the square of the volume flow (gpm) and hose length (L) to get total friction loss.
What are the methods used to determine friction loss?
Friction loss is determined by the gpm flowing, the size of the hose and the length of the hose. All three factors must be considered. Most of the fog nozzles have flow rates ranging from 95 to 200 gpm. Don’t get stuck on one flow rate; the fire will dictate which flow rate to use.
How do you calculate nozzle reaction?
The nozzle reaction is found to be: R = ρ Q 2 / A2 , where A2 is the discharge diameter, Q is the volumetric flow rate, R is the magnitude of the nozzle reaction, and r is the water density. This equation shows that the reaction is proportional to the flow rate squared, divided by the nozzle diameter.
How do you calculate nozzle pressure?
Calculates the needed diameter of a nozzle for a specific pressure and flow rate.
- Pressure: psi. ft of water. m of water. bars. kPa. atm. in of Mercury.
- Flow Rate: gpm. lps. cfs. lpm.
- Diameter: in. 128ths in. 64ths in. 32nds in. 16ths in. 8ths in. mm. cm.
How do you calculate nozzle pressure ratio?
The ratio of the nozzle total to static pressure ratio is called the nozzle pressure ratio (NPR). Considering the energy equation for the nozzle, the specific total enthalpy is equal to the static enthalpy plus the square of the exit velocity divided by two.
How is nozzle pressure measured?
The nozzle pressure can be measured with a gauge placed on a nozzle body. Simply purchase a quality gauge and a threaded nozzle cap, combine the two and install in place of a nozzle. Operate the sprayer at your expected spray pressure (say, 60 psi) with all boom sections on.
How do you calculate nozzle size?
To find the correct nozzle size you need to know the flow of your system and the pressure you wish to achieve. First, select the column with the required pressure across the top, then read down the column to find the amount of flow of your system.
What is nozzle capacity size?
Nozzles determine the application volume at a given operating pressure, travel speed, and spacing. If the size of the spray particle (for example, 250–500 microns) is doubled and the application volume stays the same, you have only one-eighth as many spray droplets (Figure 1).
How does nozzle size affect velocity?
The larger nozzle diameter gives more mass of fluid to be carried. It is also related to the momentum energy generated that when the fluid velocity s constant with increasing fluid mass so the momentum gets larger then the jt plunges deeper. The depth of bubble penetration also increased with increasing jet velocity.
Can a nozzle reduce pressure?
The pressure drops in a nozzle is because of the Bernoulli Principle . As fluid enters the smaller cross-section, it has to speed up due to the conservation of mass. Thus pressure energy is converted into faster forward motion, known as velocity. This change makes the pressure drop.
Does nozzle increase velocity?
Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy.
What is nozzle pressure ratio?
The ratio of the nozzle total to static pressure ratio is called the nozzle pressure ratio NPR. NPR = pt8 / p8 = pt8 / p0. Considering the energy equation for the nozzle, the specific total enthalpy ht is equal to the static enthalpy plus the square of the exit velocity divided by two.