This App can also be used by the field Drilling and Mud Engineers for setting cement, high viscosity and lost circulation pills using weighted average methods to estimate the OD and ID of the tubulars as only one string is allowed in the model. Should the weighted average method be used the estimated volumes should be compared with the actual calculated volumes to check for the amount of error for the displacement of the pill. The author is not responsible for any errors in the mathematics or Engineering principles of this App.