PipeFitter Reference app 
For on the job information:
To the right is a full functioning version of PipeFitter App

How to use app
1.)Choose from the list the chart required for the job
2.)Click on Next or Back to get to the previous screen or List to get back to the Main List
4.)Imperial & Metric measurements available on some of the measurement charts
Now available for free with ads on apple app store or paid version without ads