The input and output data used by external servers for calculation of the pipe pressure drop. 
   Namespace:   Autodesk.Revit.DB.Plumbing  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Remarks
 Roughness, Length, Flow, Diameter, Density, and Viscosity field values are input data for the calculation. ReynoldsNumber, FlowStatus, Friction, FrictionFactor, Velocity, Coefficient, and PressureDrop are output values.