There are several answers to this question but when it relates to flowmeters that can be used on different pipe sizes, the specification describing the limitations of the meter are often expressed as a velocity unit e.g. m/s

Watervelocity in a pipe calculator

Note: This calculator is designed for incompressible liquids and the output values volume flow are an uncorrected flow rate. If using an inferential type of flow meter, a Reynolds number compensation should be applied for greater precision.

Pipe velocity is the speed at which fluid flows through a pipe and is usually measured in terms of m/s or ft/s, considering the pipe inside diameter. The velocity.

Velocity in a pipe calculatormetric

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Maximumvelocity in pipeformula

How can I quickly calculate the flow velocity in a pipe if I know the pipe size and the volumetric flow rate?  Example = Let’s say I have a volume flow meter (oval gear meter) and it is showing me that the flow rate is 100 GPM flowing in a 4 inch pipe? What will be the velocity in m/s (meters per second)

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Gems Sensors' Warrick Liquid Level Controllers provide dependable no-moving-parts control and monitoring of conductive liquids. They are available in general purpose water level, low water cut-off, DF Series liquid level control, Series 67 multi-function level control, liquid level relays and intrinsically safe controls. The concept is simple: take advantage of a liquid's conductive properties to complete a circuit and cause a control relay to actuate. Use of permanently-mounted stationary electrodes gives the user precise accuracy, repeatability and no-moving-parts reliability. This simple concept has led to the development of a complete line of conductivity-based liquid level detectors, water level detectors, and control units and electrode fittings shown here. For OEM's we also have the capability to custom configure liquid level control units and electrode fittings to meet your specific application requirements.Learn More About Liquid Level Controls >

Calculatevelocity in pipefrom pressure

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When choosing a meter, it is important to look at the application. For example, if the flow rate is very low, then it is important to know the minimum velocity at which a flow meter will begin to work at an acceptable accuracy. The same can apply to high flow rates. A meter may have mechanical limitations which make it impossible to measure over a certain velocity.