How does AutoPIPE calculate the weight of a typical pipe fittings (i.e. Tee, elbow, reducer, etc..)?
AutoPIPE fittings are made up of equivalent center-line length of straight pipe with assigned pipe properties. Change the pipe properties used to construct a fitting in order to account for different fitting weights.Reducer are the only exception, (from online help): Over the length of the reducer, AutoPIPE assumes an average of the connecting pipes for the outside diameter (Do), wall thickness (t). This affects the reducer weight, pipe contents weight, and section properties. Material properties (E, a, and allowable stresses) from the pipe at the near end of the reducer are extended to the far end of the reducer.
Tee, Cross, or Branch Piping Components - Modeling Approaches