Estimator's Piping Man-hours ToolEstimating Man-hours for Process Piping Project - Manual of man-hours, Examples The 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...