Enter the friction factor, pipe length, pipe diameter, fluid velocity, and fluid density into the calculator to determine the pressure loss.

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## Pressure Drop Formula

The following is the pressure drop formula used to calculate a pressure drop through pipe flow.

P = f * (L/D) * (p*V^2 / 2)

- Where P is the pressure drop (pressure loss N/m^2)
- f is the friction factor
- L is the length of the pipe (m)
- D is the pipe diameter (m)
- V is the fluid velocity (m/s)
- p is the fluid density (kg/m^3)

## Pressure Drop Definition

A pressure drop is a change in pressure across a length of pipe that has fluid moving through it. The fluid flow causes a pressure differential across the length due to the forces of friction and flow.

## How to calculate a pressure drop?

- First, determine the friction factor. This is known as the Darcy friction factor and is a combination of friction between the fluid and pipe and internal fluid friction.
- Next, measure the length of the pipe.
- Next, measure the diameter of the pipe.
- Next, determine the fluid velocity. This should be the average velocity of the fluid.
- Next, determine the fluid density. For water, this would be 997 kg/m^3.
- Finally, calculate the pressure drop.

## FAQ

**What is static pressure loss?**

A static pressure loss is a negative change in pressure that is not due to the flow of fluid.

**What is a dynamic pressure loss?**

A dynamic pressure loss arises from the frictional forces of fluid flow.