Selects type and size of pipe and related materials and equipment, such as supports, hangers, and hydraulic cylinders, according to job specifications. Inspects worksite to determine presence of obstructions. Plans sequence on installation to avoid obstructions and activities of other workers. Cuts pipe using hacksaw, pipe cutter, hammer and chisel, cutting torch and pipe cutting machine. Threads pipe using threading machine. Bends pipe by hand or with pipe-bending tools and machine. Mounts pipe hangers and brackets on walls and ceiling to hold pipe. Assembles and installs a variety of metal or nonmetal pipes and pipe fittings, using threaded caulked, soldering, brazen, fused, or cemented joints, and hand tools. Secures pipes to structure with bracket, clamps, and hangers, using hand and power tools. Test piping systems for leaks by increasing pressure in pipes and observing gauges attached to pipes for indication of leaks.