How do you calculate friction loss on a fire hose?

The process of calculating friction loss in 2½” hose is accomplished by figuring the friction loss as you would for 3” hose and then doubling the result. For example, if the flow in 100 feet of 3” hose is 300 gpm, then the friction loss is 9 psi per 100′. Next, double 9 to obtain the answer of 18 psi per 100 feet.

How much friction do you lose in a fire hose?

Friction loss = 8 psi per 100 feet of hose.

What is the friction loss for 1 3 4 fire hose?

27 psi
The friction loss in a 100-foot section of 1 3/4-inch line flowing 150 gpm is 27 psi.

How is friction loss calculated?

The difference in the character of the flow from the case of water in a pipe stems from the differing Reynolds number Re and the roughness of the duct. The friction loss is customarily given as pressure loss for a given duct length, Δp / L, in units of (US) inches of water for 100 feet or (SI) kg / m2 / s2.

What causes friction loss in fire hose?

To account for friction loss, the pressure at which the pump is working must be increased. The pump pressure must also be or decreased to compensate for the head loss or gain, to produce the desired nozzle pressure.

How do you calculate friction loss in a pump?

Based on resistance coefficient of 0.26, elbow radius divided by pipe diameter equal = 4 and gravity = 9.81….Friction Loss Calculator

1. L/s.
2. L/min.
3. m3/h.

How do you calculate Fanning friction factor?

1. Copyright PipeFlow.co.uk.
2. Fanning Friction Factor.
3. The frictional head loss in pipes with full flow may be calculated by using the following formula and an appropriate Fanning friction factor. hf = f f (L/Rh) x (v.
4. /2g)
5. where: hf = head loss (m)
6. f f = Fanning friction factor.
7. L = length of pipe work (m)

What are three basic principles of friction loss?

First Principle: All other conditions being equal, friction loss varies directly with the length of the hoseline. Second Principle: When hoseline diameter remains constant, friction loss varies approximately with the square of the increase in flow rate. Doubling the flow increases friction loss by a factor four.

How do you calculate TDH?

Total dynamic head = elevation head + friction head loss + pressure head. A. Elevation head – is the vertical distance which the water must be pumped. It is the elevation difference in feet between the pumping level in the well and the pressure tank.

What is friction loss in pump?

Friction loss is the loss of energy or “head” that occurs in pipe flow due to viscous effects generated by the surface of the pipe. Friction Loss is considered as a “major loss”. “Head” is a very convenient term in the pumping business.

What is the unit of a friction factor f?

It is usually symbolized by the Greek letter mu (μ). Mathematically, μ = F/N, where F is the frictional force and N is the normal force. Because both F and N are measured in units of force (such as newtons or pounds), the coefficient of friction is dimensionless.

What is the equation for friction loss?

friction loss = friction loss coefficient * ( flow rate / 100) 2 * hose length /100. The equation is written FL = C* (Q/100)2 *L/100.

How do you calculate head loss in pipe?

Pipe Fitting Loss Formula. Fluid head loss through a fitting can be calculated by the following equation: h = K x v² / 2g. where. h = pressure loss in terms of fluid head, i.e. fluid head loss.

What is fire hose friction loss?

3.3 Friction Loss in 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.

What is the friction loss?

Friction loss. Jump to navigation Jump to search. 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.