Locates and marks reference points for columns or plates on foundation, sing master straight edge, squares, transit and measuring tape and applying knowledge of geometry Attaches rigging or signals crane operator to lift components to specified position Aligns structures or plates sections to assemble boiler frame, tanks or vats sing plumb bobs, levels, wedges, dogs or turnbuckles Hammers, flame-cuts, files grinds irregular edges of sections or structural parts to facilitate fitting edges together Bolts or arc-welds structures and sections together. Positions drums and headers into supports or bolts or welds supports to frame Aligns water tubes, connects and expands ends to drums and headers using tube expander Bolts or welds casing sections, uptakes, stacks, baffles and such fabricated parts as chutes, air heaters, fan stands, feeding tube, cat walks, ladders, coal hoppers and safety hatch to frame using wrenches Performs minor maintenance or cleaning activities with tools and equipment Installs manholes, handholds, valves, gauges and feed water connection in drums to complete assembly of water tube boilers Signals crane operator in lifting parts to specific positions Assists in testing assembled vessels by pumping water or gas under specified pressure into vessels and observing instruments for evidence of leakage Repairs boilers or tanks in field by unbolting or flame cutting defective sections or tubes, straightening plates using torch or jacks, installing new tubes, fitting and welding new sections and replacing worn lugs on bolts May fasten and caulk sections of vessels, using pneumatic fasteners and caulking hammers May line firebox with refractory brick and blocks May fabricate parts such as, stacks, uptakes, and chutes to adapt boiler to premises in which it is installed Flame cutting and knowledge of torch use Responsible for observing and complying with all safety and project rules