# Pipe Sizing

Required pipe diameter depends on a few parameters specific to the application. For heating and cooling installations the pressure drop of the fluid in pipes should be lower than the circulator pump head at the given fluid flow rate. For natural gas installations, the available pressure at the burner should be at least the minimum required by the burner itself to ignite. In both cases the pressure drop of the fluid should be within some predefined limits. The pressure drop itself is calculated as:

\(\Delta p = \lambda \cdot \frac{l}{D_{h}} \cdot \frac{\rho \cdot v^{2}}{2}\)

where

\( \frac{1}{\sqrt{\lambda}} = -2.0 \cdot log_{10}\left( \frac{2.51}{Re \cdot \sqrt{\lambda}} + \frac{\epsilon}{3.7 \cdot D_h}\right) \)

These are just two of the equations that are used to determine the pressure drop of a fluid flowing through a pipe when the flow is turbulent. How do you solve that?

It turns out it’s pretty easy.

When dealing with a heating or cooling system, use Heating Pipe Size.

When dealing with natural gas installations, use Natural Gas Pipe Size.

Both apps are available on the App Store. Using them, you will never have to worry about those two equations or their parameters. Each of the apps requires just the input of parameters relevant to the use case. For the calculation of required pipe diameter in hydronic heating or cooling systems, the engineer never starts thinking about water density at specific temperature, or about water velocity inside pipe, which in turn has its own roughness, and about relative roughness which is a function of pipe diameter. Or the Reynolds number. An engineer who needs to size pipe sections in a heating or cooling system generally thinks in terms of heat output of heating bodies and generators and required temperature difference between flow and return water. That’s basically everything. The only other input that needs to be specified is length of each pipe section, specification of fittings and valves which represent local pressure drop and pipe material. Everything else should be automatically computed - and with these apps, it is.

Some features:

- small, fast, easy to use
- just the most important user input, focused on the use case
- recommended diameter is shown, but user can choose a larger or a smaller one
- no data connection required
- always in your pocket
- no in-app purchases
- no ads
- no personal data required or collected
- no user tracking

## User reviews

### Natural Gas Pipe Size

Erdgasleitung ★★★★★

von MOMOG62 - 10 Dec, 2013

Ich benutze diese App sehr viel und immer mit Erfolg.

Habe die Angaben oft nachgerechnet und sie stimmten immer.

### Heating Pipe Size

heating pipe size ★★★★★

by italianrott - 3 Oct, 2012

Molto rapida. Usata per preventivi e dimensionamenti e un aiuto valido e rapido. Complimenti!

Excellent ★★★★☆

by Test Patrol - 16 Jan, 2013

Very fast and simple estimate pipe size. Support for ethyleneglykol would be nice.

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