Pipe Velocity Calculator

The diameter of a pipe can be calculated from the velocity and flow rate of a fluid flowing through it using the following equation:

d = (4 * Q) / (π * v)

d is the diameter of the pipe, in meters (m)

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

v is the velocity of the fluid, in meters per second (m/s)

π (pi) is approximately equal to 3.14159.

The velocity of water flow in a pipe can be calculated using the following equation:

v = Q / A

v is the velocity of the water, in meters per second (m/s)

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

A is the cross-sectional area of the pipe, in square meters (m^2)

The flow rate of a fluid in a pipe can be calculated from its velocity and the pipe's cross-sectional area using the following equation:

Q = v * A

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

v is the velocity of the fluid, in meters per second (m/s)

A is the cross-sectional area of the pipe, in square meters (m^2)

Note that the velocity should be measured at a point in the pipe where the flow is fully developed and there is no significant turbulence. This is typically at a distance of at least 10 pipe diameters downstream from any disturbances in the flow, such as valves or bends.

The formula for the flow velocity of a fluid in a pipe is:

v = Q / A

v is the velocity of the fluid, in meters per second (m/s)

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

A is the cross-sectional area of the pipe, in square meters (m^2)

This equation states that the flow velocity is proportional to the flow rate and inversely proportional to the cross-sectional area of the pipe.

The flow rate represents the volume of fluid that passes through a given point in the pipe in a unit of time, and the cross-sectional area represents the space available for the fluid to occupy.

So, as the flow rate increases or the cross-sectional area decreases, the flow velocity will increase.

Typical water velocity in a pipe is generally between 0.7-2.4 m/s:

Cold water velocity - 1.5-2.4m/s or 5-8 ft/s

Hot water flow velocity - 1.2-1.5m/s or 4-5 ft/s

Hot water return velocity - 0.7-1m/s or 2-3 ft/s

This depends on the variables:

• The local standard

For example, pipes are generally designed for higher velocities in the USA compared to the UK

• The pipe material

For example, stainless steel pipes can generally be designed to higher velocities than copper pipes

• If the pipe is above a habitable space

For example, if the pipe is above a room such as a bedroom, the pipe velocity should be kept low to avoid undue noise

• The application

For example, pipes containing hot water in recirculating systems should be designed to a lower velocity than cold water pipes

Velocities should generally not go lower than 0.7m/s as this is required to maintain a self-cleansing velocity. For example, if liquids contain solid particles, engineers try to achieve a higher velocity so that the heavy particles in the liquid don’t settle and cause blockage in the pipe.

Yes, reducing the size of a pipe will generally increase the velocity of the fluid flowing through it. According to the principle of conservation of mass, if the pipe's cross-sectional area decreases, the fluid's velocity must increase to maintain the same flow rate.

This relationship can be expressed mathematically using the following equation:

Q = v * A

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

v is the velocity of the fluid, in meters per second (m/s)

A is the cross-sectional area of the pipe, in square meters (m^2)

The velocity will increase as the cross-sectional area decreases, and as the cross-sectional area increases, the velocity will decrease. This is known as the continuity equation and is a fundamental principle of fluid dynamics.

No, the velocity of a fluid flowing in a pipe does not increase with the size of the pipe.

The velocity of a fluid in a pipe is determined by the balance between the flow rate and the cross-sectional area of the pipe.

If the flow rate remains constant and the cross-sectional area increases, the velocity will decrease.

The relationship between the flow rate, velocity, and cross-sectional area of a pipe can be expressed mathematically using the following equation:

Q = v * A

Q is the volumetric flow rate, in cubic meters per second (m^3/s)

v is the velocity of the fluid, in meters per second (m/s)

A is the cross-sectional area of the pipe, in square meters (m^2)

If the flow rate remains constant, increasing the cross-sectional area of the pipe will decrease the velocity, and decreasing the cross-sectional area of the pipe will increase the velocity.

The velocity of a fluid in a pipe is not directly related to the size of the pipe, but rather to the balance between the flow rate and the cross-sectional area of the pipe.