An app for engineers to determine pipe stresses at supports and midspans. At supports, pipe stresses are calculated based on ring girder supports. The calculations are based on the "American Water Works Association - Manual M11 Fourth Edition - Steel Pipe : A Guide For Design And Installation". Pipe stresses can be calculated for various conditions such as pipe empty or pipe full, and with or without water hammer, and at various pipe locations around it based on Figure 7.6 -Stiffener Ring Coefficients of Chapter 7 of the "American Water Works Association - Manual M11 Fourth Edition - Steel Pipe : A Guide For Design And Installation".