1) Bell, bead with power hammers, or weld pressure vessel tube ends, in order to ensure leak proof joints.

2) Bolt or arc-weld pressure vessel structures and parts together, using wrenches and welding equipment.

3) Examine boilers, pressure vessels, tanks, and vats to locate defects such as leaks, weak spots, and defective sections so that they can be repaired.

4) Inspect assembled vessels and individual components, such as tubes, fittings, valves, controls, and auxiliary mechanisms, to locate any defects.

5) Install manholes, hand holes, taps, tubes, valves, gauges, and feed water connections in drums of water tube boilers, using hand tools.

6) Install refractory bricks and other heat-resistant materials in fireboxes of pressure vessels.

7) 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.

8) Locate and mark reference points for columns or plates on boiler foundations, following blueprints and using straightedges, squares, transits, and measuring instruments.

9) Position, align, and secure structural parts and related assemblies to boiler frames, tanks, or vats of pressure vessels, following blueprints.