Pipe Friction Loss Calculator - Calculator Academy

Enter the friction factor, the length (m), the inner diameter (m), and velocity (m/s), into the calculator to determine the Pipe Friction Loss.

Pipe Friction Loss Formula

The following formula is used to calculate the Pipe Friction Loss.

Pfl = f * (L/D) * (V^2 / (2*g))

Where Pfl is the Pipe Friction Loss (m)
f is the friction factor
L is the length (m)
D is the inner diameter (m)
V is the velocity (m/s)
g is the acceleration due to gravity (9.81m/s^2)

To calculate the pipe friction loss, multiply the friction factor by the ratio of the length to the inner diameter, then multiply by the velocity squared divided by 2 times the acceleration due to gravity.

How to Calculate Pipe Friction Loss?

The following example problems outline how to calculate the Pipe Friction Loss.

Example Problem #1

First, determine the friction factor. In this example, the friction factor is given as .45 .
Next, determine the length (m). For this problem, the length (m) is given as 10 .
Next, determine the inner diameter (m). In this case, the inner diameter (m) is found to be .6.
Next, determine the flow speed. This is 12 m/s.
Finally, calculate the Pipe Friction Loss using the formula above:

Pfl = f * (L/D) * (V^2 / (2*g))

Inserting the values from above yields:

Pfl = .45 * (10/6) * (12^2 / (2*9.81)) = 5.504 (m)

FAQ

What factors affect the friction factor in pipe flow?

The friction factor in pipe flow is influenced by the roughness of the pipe’s interior surface, the flow velocity, the diameter of the pipe, and the viscosity and density of the fluid. Rougher surfaces, higher velocities, and lower viscosities tend to increase the friction factor.

How can pipe friction loss impact a fluid transport system?

Pipe friction loss can lead to a significant drop in pressure over the length of the pipe, affecting the efficiency of fluid transport systems. It can increase energy costs for pumping fluids and may require the use of pumps with higher capabilities or adjustments in pipe design to minimize losses.

Can the pipe friction loss formula be used for any type of fluid?

Yes, the pipe friction loss formula can be applied to any type of fluid, but it’s important to use the correct friction factor and fluid properties (such as viscosity and density) specific to the fluid being transported. The formula assumes a steady, incompressible flow for accurate calculations.