# Surge Pressure Calculator, Formula, Surge Pressure Calculation

## Surge Pressure Calculator:

Enter the values of velocity of the fluid, V(m/s) and density of the fluid, D(kg/m3) to determine the value of Surge pressure, P(Pa).

 Enter Velocity of the Fluid: m/s Enter Density of the Fluid: kg/m3 Result – Surge Pressure: Pa

## Surge Pressure Formula:

Surge pressure refers to the sudden increase in pressure within a fluid system due to a rapid change in flow velocity, often caused by abrupt valve closure or pump startup /shutdown.

This pressure spike can lead to significant stress on pipes and fittings, potentially resulting in system damage or failure. Surge pressure is also known as “water hammer” in pipelines and is characterized by loud banging noises caused by the fluid’s momentum.

Surge pressure – the additional pressure created by the sudden flow change.

Fluid density – the mass of the fluid per unit volume.

Fluid density – the mass of the fluid per unit volume.

A denser fluid (like water) will generate a higher surge pressure compared to a less dense fluid (like air) under the same conditions.

A higher fluid velocity (faster flow) leads to a more significant surge pressure when the flow is suddenly stopped or started.

Surge pressure, P(Pa) in Pascals is calculated by the product of 0.8, velocity of the fluid, V(m/s) in metres per second and density of the fluid, D(kg/m3) in kilograms per cubic metres, kg/m3.

Surge pressure, P(Pa) = 0.8 * V(m/s) * D(kg/m3)

P(Pa) = surge pressure in Pascals, Pa.

V(m/s) = velocity of the fluid in metres per second, m/s.

D(kg/m3) = density of the fluid in kilograms per cubic metres, kg/m3.

### Surge Pressure Calculation:

1. A fluid with a density of 850 kg/m3 is flowing at a velocity of 2.5 m/s in a pipe. Calculate the surge pressure.

Given: V(m/s) = 2.5m/s, D(kg/m3) = 850kg/m3.

Surge pressure, P(Pa) = 0.8 * V(m/s) * D(kg/m3)

P(Pa) = 0.8 * 2.5 * 850

P(Pa) = 1700Pa.

1. A surge pressure of 2400 Pa is observed in a pipeline with a fluid density of 960 kg/m3. Determine the velocity of the fluid.
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Given: P(Pa) = 2400Pa, D(kg/m3) = 960kg/m3.

Surge pressure, P(Pa) = 0.8 * V(m/s) * D(kg/m3)

V(m/s) = P(Pa) / 0.8 * D(kg/m3)

V(m/s) = 2400 / 0.8 * 960

V(m/s) = 3.13m/s.