# How do you calculate friction loss in a fire hose?

Using the hand method, for each 100-foot length of 1¾-inch hose flowing 200 gpm, the friction loss is 48 psi: 2 x 4 x 6 = 48 psi. For a 3-inch supply line flowing 300 gpm, the friction loss per 100-foot section would be 9 psi: 3 squared equals 9 psi.

Friction loss = 8 psi per 100 feet of hose.

Subsequently, question is, what is the friction loss in 5 inch fire hose? The friction loss for five-inch line flowing 500 gpm is roughly two psi.

Beside above, what is the friction loss formula?

In mechanical systems such as internal combustion engines, the term refers to the power lost by overcoming friction between two moving surfaces. friction loss = friction loss coefficient * ( flow rate / 100) 2 * hose length /100. FL = C* (Q/100)2 *L/100.

What is the flow rate of a fire hose?

The 1 1/2-inch double jacket fire hose provides 5.06 gallons per minute per dry pound of hose (150 GPM / 29.6 lbs dry = 5.06 GPM/pound). While 150 GPM may be plenty in many situations, this hose trades ease of use for lower flow rates.

### What does friction loss mean?

From Wikipedia, the free encyclopedia. In fluid flow, friction loss (or skin friction) is the loss of pressure or “head” that occurs in pipe or duct flow due to the effect of the fluid’s viscosity near the surface of the pipe or duct.

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### What is Jet Reaction?

Jet Reaction is a motorcycle built by British motorcycle land-speed record challenger Richard Brown. The motorcycle is powered by a turboshaft helicopter engine converted to afterburning turbojet.

### How long is a fire engine hose?

The standard length is 50 ft (15.24 m). Supply and relay hoses are large-diameter, fabric-covered, flexible hoses used to bring water from a distant hydrant to the fire pumper, or to relay water from one pumper to another over a long distance.

### What is friction factor in pipe flow?

Friction factor (μ) is defined as the ratio between the force required to move a section of pipe and the vertical contact force applied by the pipe on the seabed.

### How do you size a water pump?

Quick Formula Water horsepower = minimum power required to run water pump. TDH = Total Dynamic Head = Vertical distance liquid travels (in feet) + friction loss from pipe. Q = flow rate of liquid in gallons per minute. SG = specific gravity of liquid (this equals 1 if you are pumping water) Water horsepower =

### What is Moody chart used for?

Moody chart. In engineering, the Moody chart or Moody diagram is a graph in non-dimensional form that relates the Darcy-Weisbach friction factor fD, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

### How do you find the Darcy friction factor?

Observe the value of the friction factor for laminar flow at a Reynolds number of 1000. If the value of the friction factor is 0.064, then the Darcy friction factor is plotted in the Moody diagram. Note that the nonzero digits in 0.064 are the numerator in the formula for the laminar Darcy friction factor: fD = 64Re.