A pipefitter is a tradesperson who installs, assembles, fabricates, maintains and repairs mechanical piping systems. Pipefitters usually begin as helpers or apprentices. Journeyman pipefitters deal with industrial/commercial/marine piping and heating/cooling systems. Typical industrial process pipe is under high pressure, which requires metals such as carbon steel, stainless steel, and many different alloy metals fused together through precise cutting, threading, grooving (Victaulic), bending and welding. A plumber concentrates on lower pressure piping systems for sewage and potable water (tap water), in the industrial, commercial, institutional, or residential atmosphere. Utility piping typically consists of copper, PVC, CPVC, polyethylene, and galvanized pipe, which is typically glued, soldered, or threaded. Other types of piping systems include steam, ventilation, hydraulics, chemicals, fuel, and oil.
In the United States, many states require pipefitters to be licensed. Requirements differ from state to state, but most include a four- to five-year apprenticeship. Union pipefitters are required to pass an apprenticeship test (often called a "turn-out exam") before becoming a licensed journeyman. Others can be certified by the N.C.C.E.R.
Pipefitters install, assemble, fabricate, maintain, repair and troubleshoot mechanical piping systems carrying fuel, chemicals, water, steam and air in heating, cooling, lubricating and various other process piping systems. Pipefitters are employed in the maintenance departments of power stations, refineries, offshore installations, factories and similar establishments, by pipefitting contractors.
In North America, union pipefitters are members of the United Association. Wages vary from area to area, based on demands for experienced personnel and existing contracts between local unions and contractors.
Difference between pipefitting and pipelaying
Pipefitters should not be confused with pipelayers. Both trades involve pipe and valves and both use some of the same tools. However, pipelayers usually work outside, laying pipe underground or on the seabed, while pipefitters typically work inside, installing piping in buildings or ships. One author summarizes the different tasks this way:
- Pipe layers operate the backhoes and trenching machinery that dig the trenches to accommodate the placement of sanitary sewer pipes and stormwater sewer drainpipes. They use surveyor’s equipment to ensure the trenches have the proper slope and install the pieces of pipe in the trenches, joining the ends with cement, glue or welding equipment. Using an always-open or always-closed valve called a tap, pipe layers connect them to a wider system and bury the pipes.
- Pipe fitters plan and test piping and tubing layouts, cut, bend or fabricate pipe or tubing segments and join those segments by threading them, using lead joints, welding, brazing, cementing or soldering them together. They install manual, pneumatic, hydraulic and electric valves in pipes to control the flow through the pipes or tubes. These workers create the system of tubes in boilers and make holes in walls and bulkheads to accommodate the passage of the pipes they install.
- https://tradesecrets.alberta.ca/trades-occupations/profiles/0074/ Steamfitter/Pipefitter Trade Profile. Alberta Trade Secrets. 1995-2010.
- Will Charpentier, Pipe Layers vs. Pipe Fitters, Demand Media.