Does anyone know where to find detailed equations on the advantica/stoner water hammer surge model. The client my company is working for has hired advantica to do these water hammer cases for heavy crude and they have produced a report that makes recommendations that effect our P&ID's. I would just like to have a better understanding of what they are doing, the stamping PE is going to cloud there recommended items on the P&ID and disclaimer that he is not responsible but advantica is. When I talked to them all I got was that the stoner model was different than the method of characterization. I have looked up water hammer in perrys and bought the 2 books (fluid transients and symposium on water hammer from 1933) that were cited under the abbreviated water hammer equation in perrys. I have not had a ton of time to go throught these 2 books yet but I did notice the books went into the method of characterization but I did not see to much on the stoner method. I also learned that the stoner model was more of a finite element analysis and the method of characterization was an exact solution but only applied to simple systems.