Here's the free version of Industrial Insulation so that you can try it out before downloading it from the apple store or Google Play. 

How to Use App
By default the app is set to 9" X 1-1/2" pipe Insulation
1.)In top bar click on Pipe Size box to change pipe size of insulation that you are working with (1/2"-36")
2.)Click on Thickness box to enter the thickness of insulation (1"-5")
3.)The First blue symbol is a quick list of charts
The second symbol is an equal tee layout 
The third symbol is an un-equal tee layout
The fourth symbol is a gore pattern layout
The fifth is a lateral layout of 45°
4.)For help using the layout pattern click on the help button or go to the appropriate help selection on the help page by clicking here