Pipe Diameter Calculation

Impossible, too many unknowns e.g length.
Why not just measure it? Or it's circumference and divide by pi.
Del

What an attitude!

Do it yourself

Use an online calculator. They'll work for anybody.

For deeper study, you can search the Web for Hazen-Williams, Dacry-Weisbach, and Colebrook equations; along with Moody chart.

Oh boy.......

Time to REVISIT HYDRAULICS 101!

Wrongpath....

Here is a real answer that you may actually benefit from........rather than the bable of chuckleheads.

It is the flow, density of the fluid and engineering common sense about the maximum velocity you can tolerate that will set the pipe inner diameter.

In the correct engineering of a piping system, there is usually a trade-off between the cost of pumping and the cost of the piping that will set the pipe size. Most systems are designed for 3 - 10 feet per second velocity....but there are exceptions.

Some selected systems (such as suction piping to sensitive pumps) should be designed to 2 - 4 FPS.

In certain chemical systems, ( such as sulfuric acid in carbon steel systems) a velocity of 1 - 2 FPS is best.

The maximum operating pressure is used to select piping wall thickness and the pressure rating of valves.

Hope that this helps

The first thing you should do, is to determine the thickness of the pipe that you would require based on the internal pressure. You could refer to ASME 31.3 to do the necessary calculations. This is to ensure that the thickness chosen is able to overcome the pressure.

than with the flow you have, smartly choose a pipe diameter, use darcy's law (refer to the web for the formula) and determine the frictional loss due to this pipe size diameter. You can play around with the pipe diameter until you have a satisfactory frictional lose.

Hope this helps