- installs, assembles, fabricates, maintains and repairs mechanical piping systems. Industrial pipefitters analyze blueprints to determine the kind of pipes required and the most efficient method of installation. Responsibilities Lay out, cut and fabricate any system of pipes, valves, traps, regulators and ect. from blueprints or verbal instructions. Maintain and repair all types of valves, regulators, traps and ect. Maintain and repair high pressure hydraulic systems, boilers, associated pip…