There are piping systems throughout the entire shipyard that serve the facilities with water, gas and air. Maintenance pipefitter apprentices learn to maintain the various piping systems throughout the shipyard’s 550- acre facility. Maintaining these piping systems and facilities is critical to shipyard operations. Apprentices in this trade become proficient in many skills and processes, including bending, threading, brazing and welding. They also learn how to overhaul valves and repair piping systems of various materials such as steel, copper and PVC.