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wildfire5 config.pro option documentation for: PIPING_MATERIAL_SOURCE            

piping_material_source

piping_material_source
weight_length*, material_dir
sets the source for material information.
  weight_length - calculates the wet weight of the pipeline using weight/length.
  material_dir - calculates the dry weight of the pipeline using the material file. to use this option, you must set the pro_material_dir file to use.