0
Friction loss is one of the things we use that's critical when pumping a fire truck with crosslays/hose off the truck. The most common formula runs off 100ft sections in the following size/FL format:
1.75 hose (crosslay/jump line): ~13.5 PSI loss per 100' section 2.5" hose (blitz line): ~18 PSI loss per 100' section 5" hose: .08 PSI loss per 100' section
All rates are based on your typical flow rate in GPM's...however the more gallonage the more friction loss.
There is an accepted standard for GPM and friction loss:
1.5" hose 100GPM at 30PSI per 100'
1.75" hose 150 GPM at 32 PSI per 100'
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Which as more resistance a garden hose or a fire?
Difficult to say. Hydraulic resistance is proportional to diameter as well as length and velocity. Water moving very slowly in a short length of either type of hose would have negligible resistance. The more likely answer you want is that high-velocity water in a garden hose would experience MUCH more resistance (friction loss) than that in any fire hose of larger diameter. The actual numbers will depend upon specific friction-loss factors, including the type and size of hose and the gallons per minute. For example, the friction loss coefficient in a 1.5-inch fire hose (24) is more than ten times what it would be in a 2.5-inch hose (2.0) and 100 times that of a 4-inch hose (0.2).
What is the standard length of a fire hose onboard a ship?
in America the standard length of a fire hose is 50 feet Hose used if wildland fire suppression comes in 100 foot sections
What are some fire fighting equations?
PDP= NP + FL +/- H PDP=Pump Discharge Pressure NP=Nozzle Pressure FL=Friction Loss H=Head Pressure FL=CQ^2L in kPa FL=Friction Loss C=Friction Loss Coefficients Q=Flow divided by 100 L=is equal to the number 30 m lengths Approx. Fire Flow requirements for a structure fire=l*w*h*1.3 L=length of the building W=width of the building H=Height of the building 1.3=constant
What is the friction loss in 100feet of 5 inch fire hose?
It depends on flow. 2 PSI for 500 GPM 8 PSI for 1000 GPM 18 PSI for 1500 GPM 32 PSI for 2000 GPM This is per 100' ft If your flows are big, ie. defensive conditions, you must relay for anything over a couple hundred feet in length. Capt. Ridgeway Tumwater Fire
How much does 100 ft of 4 inch fire hose weigh?
100 pounds with couplings, 68 without.
What force stops manchines from being 100 percent efficient?
Reducing its temp. heat is the most common form of energy, and when a machine has friction, it is creating heat. by reducing the amount of friction, maybe by using some kind of lubricant between the objects, it will create less heat and thus use less energy input, with a higher input to out put ratio.
How much does a 100 ft section of 2.5 inch in diameter fire hose weigh with water?
That section of hose holds 25.5 gallons of water when it's full, which weighs about 213 pounds. To that, add the weight of the empty hose, which I don't know.
Whats the longest fire hose firefighters use?
Firefighters normally use hose sections of 50 feet so that they can add sections or take away sections to make the needed length. Many larger diameter hoses are used in lengths of 100 feet and can be connected for thousands of feet, if necessary. The friction losses inside smaller hoses would make longer hose lines impractical. Many commercial buildings include "standpipes" in their construction so that a firefighter can simply carry 150 feet of hose (in a "high-rise pack") inside the building, connect it to the standpipe outlet, and use water pressure in the standpipe to fill the hose and put out the fire where the nozzle is directed.
What is the maximum water flow through a 3 inch fire hose?
To find the maximum flow you would need to know the maximum pressure. A typical fire nozzle pressure would be up to 100 psi with a diameter of 1 to 1.25 inches. The GPM would be between 300 GPM and 460 GPM through the nozzle. If it were simply a 3-inch pipe with an oversized pump, running at 100 psi with no nozzle, you could (in theory) move over 3,000 GPM through the pipe (ignoring friction loss). Even at 80 psi, a master stream through a 2-inch nozzle moves over 1,000 GPM.
How much does a 100 ft section of 5 inch in diameter fire hose weigh with water?
It is an accepted fire service understanding that 5" Large Diameter Hose (LDH) will hold 1 gallon/ft. On average a 100' section of 5" empty weighs 110 lbs. With water weighing 8.33 lbs/gal. a 100' section of LDH filled with water will weigh approximately 944 lbs.
Does friction reduce efficiency of a machine?
When a machine is running at 100 % efficiency there is no loss of energy anywhere. That means the machine is running silently and if turned off will continue to run without stopping. In the real world there is sound and there is friction. Both sound and friction are examples of less than perfect efficiency
How calculate the static loss in plenum box?
Take width x Height of the plenum, Calculate Equivalent Diameter, Then for the specified air flow rate, Find the Static loss factor( feet / 100 feet of WC). then Calculate Friction Head ie,((Feet/100 ft of WC x Length of the plenum)/100)
