# How Do I Calculate the Size of Water Pipes?

## Answer

To calculate the size of a water pipe, start by estimating the flow rate, pipe diameter and then measure the pipe run. Get the length of the pipe equal to resistance of fittings and then calculate the effective pipe length. In addition, get the pressure at the start of the section and at the end of the section to get the correct pipe size.
Q&A Related to "How Do I Calculate the Size of Water Pipes"
 1. The symbol for pi. Not all calculators are equipped with such a key. Multiply pi by 0.25. 2. Press the multiply button again and enter the pipe diameter squared. 3. Press the multiply http://www.ehow.com/how_6390417_calculate-flow-giv...
 Simply measure the L x W and figure in the PITCH and check the average rainfall for the area your in the weather service gives you this information. Here is an article I wrote in http://wiki.answers.com/Q/How_do_you_calculate_the...
 This sort of calculation is really complex. It depends on the area of exposed copper, the temperature differential between the pipe and surrounding air, the orientation of the pipe http://www.quora.com/How-do-you-calculate-the-pote...
 The table should have axises, more like a graph not a table one should have pipe sizes the other should have pressures, where they intersect should be a number. this will be the flow http://answers.yahoo.com/question/index?qid=200809...
1 Additional Answer
You can calculate the size of water pipes by multiplying the product of the square of the radius and the height by 3.1412. The number 3.1412 is a constant called pi, arrived at by dividing 22 by 7. You can also get the rate of water flow by dividing the amount of water collected by the answer got in this calculation.
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