Study blueprints to determine locations, relationships, and dimensions of parts. Assemble large vessels in an on-site fabrication shop prior to installation, in order to ensure proper fit. Attach rigging, and signal crane hoist operators to lift heavy frame and plate sections and other parts into place.Clean pressure vessel equipment, using scrapers, wire brushes, and cleaning solvents.Shape and fabricate parts, such as stacks, uptakes, and chutes, in order to adapt pressure vessels, heat exchangers, and piping to premises, using heavy- metalworking machines such as brakes, rolls, and drill presses.

Bell, bead with power hammers, or weld pressure vessel tube ends, in order to ensure leak proof joints.Bolt or arc-weld pressure vessel structures and parts together, using wrenches and welding equipment.Examine boilers, pressure vessels, tanks, and vats to locate defects such as leaks, weak spots, and defective sections so that they can be repaired.Inspect assembled vessels and individual components, such as tubes, fittings, valves, controls, and auxiliary mechanisms, to locate any defects.Install manholes, handholes, taps, tubes, valves, gauges, and feed water connections in drums of water tube boilers, using hand tools.Install refractory bricks and other heat-resistant materials in fireboxes of pressure vessels.

Study blueprints to determine locations, relationships, and dimensions of parts. Assemble large vessels in an on-site fabrication shop prior to installation, in order to ensure proper fit. Shape and fabricate parts, such as stacks, uptakes, and chutes, in order to adapt pressure vessels, heat exchangers, and piping to premises, using heavy- metalworking machines such as brakes, rolls, and drill presses.

Lay out plate, sheet steel, or other heavy metal, and locate and mark bending and cutting lines, using protractors, compasses, and drawing instruments or templates.Locate and mark reference points for columns or plates on boiler foundations, following blueprints and using straight edges, squares, transits, and measuring instruments.Position, align, and secure structural parts and related assemblies to boiler frames, tanks, or vats of pressure vessels, following blueprints.Repair or replace defective pressure vessel parts, such as safety valves and regulators, using torches, jacks, caulking hammers, power saws, threading dies, welding equipment, and metalworking machinery.Shape seams, joints, and irregular edges of pressure vessel sections and structural parts in order to attain specified fit of parts, using cutting torches, hammers, files, and metalworking machines.Straighten or reshape bent pressure vessel plates and structure parts, using hammers, jacks, and torches.