# Calculating Water Flow into a Pipe

• Bob_
In summary: He has a gas pipe with a 40mm hole next to a burst water pipe that is blasting the hole with a constant pressure of 4000 millibar. He is looking for a way to calculate the rate of water flow entering the hole in the gas pipe and asks if Bernoulli's law can be used. Another person jokingly asks if he is related to Bob the Builder. However, Dave is advised to focus on fixing the gas pipe first and not worry about the water flow rate. In summary, Dave needs help with calculating the rate of water flow entering a 40mm hole in a gas pipe that is being blasted by a burst water pipe at work.
Bob_
Hi all,

I have a practical problem at work that I need some help with please!

In the ground, there is a gas pipe that runs alongside a burst water pipe. There is a hole in the gas pipe of approx 40mm in diameter, and the water is blasting the hole with constant water pressure of 4000 millibar.

Any idea how to work out rate of water flow entering the hole in the gas pipe?

Any help much appreciated! The only comparable problems I can find on the net are rate of water leaking out of a hole in a bucket that is full with water (bernoulli's law). Can this equation be used too? Q = A x v?

A gas pipe with a 40 mm hole!*#?

Are you any relation to bob the builder?

Studiot said:
A gas pipe with a 40 mm hole!*#?

Are you any relation to bob the builder?

hahaha yeah
why on Earth are you fixated on a water flow when you have a huge hole in a gas pipe ?
forget the water flow rate, it isn't important to your problem, turn it off and get the gas pipe fixed then get the water main fixed

Dave

## 1. How do you calculate water flow into a pipe?

To calculate water flow into a pipe, you will need to know the pipe's diameter, length, and the pressure difference between the two ends of the pipe. You can then use the Bernoulli's equation or the Darcy-Weisbach equation to calculate the flow rate.

## 2. What is Bernoulli's equation and how is it used to calculate water flow?

Bernoulli's equation is a fundamental principle in fluid dynamics that states that the sum of kinetic, potential, and pressure energies in a fluid system remains constant. It can be used to calculate water flow by equating the pressure energy at the inlet to the pressure energy at the outlet, and solving for the velocity of the water.

## 3. Can you explain the Darcy-Weisbach equation and its role in calculating water flow?

The Darcy-Weisbach equation is an empirical formula used to calculate the pressure drop or head loss in a pipe due to friction. It takes into account the pipe's length, diameter, roughness, and flow velocity. By solving for the pressure drop, you can then calculate the water flow rate using the continuity equation.

## 4. What is the continuity equation and how is it related to calculating water flow?

The continuity equation states that the mass flow rate of a fluid through a pipe is constant. This means that the product of the fluid's velocity and cross-sectional area at any point in the pipe must remain the same. By rearranging the equation, you can solve for the velocity, which is necessary for calculating water flow.

## 5. How accurate are the calculations for water flow into a pipe?

The accuracy of the calculations for water flow into a pipe depends on the accuracy of the input parameters and the equations used. In most cases, the calculations can provide a good estimate of the actual flow rate. However, factors such as turbulence and irregularities in the pipe's surface can affect the accuracy of the results. It is important to use the appropriate equations and input values to ensure the most accurate calculation.

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