# Readers ask: How to calculate flow rate through a pipe when the velocity is not known?

## How do you calculate flow rate in a pipe?

The equation for pipe diameter is the square root of 4 times the flow rate divided by pi times velocity. For example, given a flow rate of 1,000 inches per second and a velocity of 40 cubic inches per second, the diameter would be the square root of 1000 times 4 divided by 3.14 times 40 or 5.64 inches.

## How do you calculate water velocity in a pipe?

How to Calculate Water Velocity. Thus, the velocity v is equal to the flow rate Q divided by the cross-sectional area A. When using this formula all units should be in the same form.

## How do you calculate velocity and flow rate?

Flow rate and velocity are related by Q=A¯v where A is the cross-sectional area of the flow and v is its average velocity.

## How do you calculate the fluid flow through a hole in a pipe?

How to Calculate the Fluid Flow Through a Hole in a Pipe

1. Step 1: Collect Measurements of the Pipe. Obtain measurements: diameter (D) of the hole in the pipe and height (h) of the surface of the fluid above the hole.
2. Step 2: Determine the Cross-Sectional Area.
3. Step 3: Find the Fluid Velocity.
4. Step 4: Find the Fluid Volume Flow (Flux)

## How do you calculate flow rate and pressure in a pipe?

Multiply this answer by the pressure drop across the pipe, measured in pascals. With a pressure drop, for instance, of 80,000 pascals, 0.0025 x 80,000 = 200. Multiply the constant pi by the answer to Step 1: 3.142 x 0.0025 = 0.00785. This answer is the pipe’s cross-sectional area.

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## What is the flow rate of a 1 inch pipe?

Assume Average Pressure. (20-100PSI) About 12f/s flow velocity
1″ 1.00-1.03″ 37 gpm
1.25″ 1.25-1.36″ 62 gpm
1.5″ 1.50-1.60″ 81 gpm
2″ 1.95-2.05″ 127 gpm

## What is the maximum water velocity in pipe?

Water velocities in pipes and tubes should not exceed certain limits

Application Maximum Velocity
(m/s) (ft/s)
Tap water 1.0 – 2.5 3.3 – 8.2
Cooling water 1.5 – 2.5 4.9 – 8.2
Suction boiler feed water 0.5 – 1.0 1.6 – 3.3

## How much water will flow through a 2 inch pipe?

2inch pipe: 850 gallons per minute.

## Is flow rate the same as velocity?

Flow is a measure of air output in terms of volume per unit of time. Velocity refers to how fast the air is moving in distance per unit of time. The common units are feet per second, metres per second, etc. ​Pressure is the measure of force applied on an area.

## How do I calculate flow rate?

Q=Vt Q = V t, where V is the volume and t is the elapsed time. The SI unit for flow rate is m3/s, but a number of other units for Q are in common use. For example, the heart of a resting adult pumps blood at a rate of 5.00 liters per minute (L/min).

## How is flow rate calculated?

Depending on your system, use a bucket and a stopwatch to measure flow. Attach a tube or hose onto your spigot and time how long it takes to fill a 5 gallon bucket. If your spigot can fill a 5 gallon bucket in 47 seconds, you can figure out the flow rate with the following formula. Flow rate = volume / time.

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## How do you calculate area of flow?

If the liquid is flowing through a pipe, the area is A = πr2, where r is the radius of the pipe. For a rectangle, the area is A = wh where w is the width, and h is the height. The flow rate can be measured in meters cubed per second (m3/s), or in liters per second (L/s).

## How does diameter of a pipe affect flow rate?

Pipe Diameter (D): The larger the pipe diameter is, the slower the flow velocity will be. Optimal flow rate can be maintained without increasing the velocity, if a larger pipe is specified.

## How do you calculate water loss?

Total water loss is calculated by subtracting the amount of water billed or consumed from the amount of water produced.