Introduction
These programs will work on a mobile device and also on a Desk top PC.
They will also will work off line.
Free version will calculate the internal water pipe diameter up to 50mm (2") for any number of dwellings.
The free version is based on the number of dwellings, but fractional dwellings can be entered.
Maximum Allowable Velocity
The free version of the program uses 2.4m/s. (8 feet/sec).
Minimum Residual Head
This is the pressure that we want to end up with at the last fixture (the worst case).
The International Plumbing Code allows different pressures for different fixtures. However for simplicity, the calculators use 14m (20psi).
This is the pressure that Manufacturers recommend for most mixing and tempering valves.
Screen Shots
Free Version screen

Free Version screen