Estimating Man-hours for Process Piping Project - Manual of man-hours, ExamplesThe author of this Manual, has an expertise of 45 years in his professional work as Head of Work, Project Manager and finally as president of a Company of Constructions and Industrial Assemblies in different plants of Chemical Processes, Refineries, Pipelines, Gas Compressors and Thermal Power plants of their country and abroad, exercising the direction of the works and the control of the resources used for their execution, particularly in the case of installation of piping. This Manual that gives the Reader is the fruit of that Technical Expertise.