Introduction.- Fluids and Fluidifyable Ssubstances.- Definitions Regarding the Fluids to be Transported and the Transportation System.- Transportation Systems.- Necessary Disciplines for the Theoretical Approach of the Treaty.- Fluid Mechanics.- Strength of Materials in Cylindrical Enclosures.- Thermodynamics.- Fundamental Objective of the Text.- Optimization of Piping Systems.- Generalized Lagrange Method for Several Variables.-Transportation of Liquid Substances Through Pipes.- Introduction.- Fluids and Fluidifyable Ssubstances.- Definitions Regarding the Fluids to be Transported and the Transportation System.- Transportation Systems.- Necessary Disciplines for the Theoretical Approach of the Treaty.- Fluid Mechanics.- Strength of Materials in Cylindrical Enclosures.- Thermodynamics.- Fundamental Objective of the Text.- Optimization of Piping Systems.- Generalized Lagrange Method for Several Variables.-Transportation of Liquid Substances Through Pipes.