A free program for Android, by Thinkov.

Tube Math Pipefitter is an application that solves the problems of the pipe fittings using the same technology as a spreadsheet, and its purpose is to help the user solve the problems that typically arise in the fitting process, such as the size of the pipe to use, the type of connection, the direction of the connection, etc. 

The user can enter the data and the result will appear immediately. 

The application is designed to be used by professionals in the field of pipe fittings.

How to use:

The first thing to do is to select the case you want to solve.