The duties performed by HT's include: installing, maintaining and repairing valves, piping, plumbing system fittings and fixtures, and marine sanitation systems. Repairing decks, structures and hulls by welding, brazing, riveting and caulking; examining, testing welds and various shipboard structures; fabricating with light and heavy gauge metal such as aluminum, stainless steel, sheet copper and brass, steel, sheet and corrugated iron; heat treating, hot and cold forming of metals; pipe cutting, threading and assembly; repairing installed ventilation ducting; repairing metal, wood and fiberglass boats; installing and repairing insulation and lagging; operating marine sanitation systems
Navy ships are made of metal. Metal and water, especially salt water, do not go good together. HT's fight a 24-7 battle against the elements to keep their ship seaworthy and in good repair. The ships systems we often take for granted, plumbing, heating ventilation and air conditioning are in constant operation. They are not luxuries but absolute necessities and must be kept in top operating shape. To compound the problem, most systems are redundant so there is twice as much to keep up.
At sea you can not just run to Lowes or Builder's Square every time you need repair parts. HT's must be creative and resourceful. Talk about no job to big or small? HT's must be ready for anything from fixing a leaky faucet to repairing a gaping hole in the hull from an enemy shell, all at a moment's notice.