Pipe Threading Machines
Pipe threaders spin pipe at high torque. If a glove, sleeve or rag gets caught on the rotating pipe, it can wrap up a worker’s arm in a split second, causing broken bones, amputations or worse. The machine will not stall on its own.
- Construction
- Plumbing
Photo: threading machine with foot switch, pipe supported on a stand
Types of equipment
- Threading machines: a chuck spins the pipe while a die head cuts threads. They often include a cutter and reamer.
- Portable power drives: handheld drives that turn a die head on stationary pipe. They need a support arm to resist torque.
- Roll groovers mounted on threading machines have the same rotating-pipe hazards.
Set-up
- Machine on a stable, level surface, legs locked
- Foot switch working, so the machine stops when you lift your foot. Never block or bypass it
- Pipe supported with stands so it can’t whip, sag or fall
- Area around the rotating pipe barricaded, especially the far end of long pipe
- Dies sharp; cutting oil filled; oil drip pan in place
- GFCI protection; cord and plug in good condition
- Operator’s manual read and guards in place
Operating
- Keep hands, rags and loose clothing away from the rotating pipe and chuck.
- Roll sleeves tight or wear close-fitting sleeves; no loose jackets, hoodie strings or jewelry.
- Stand on the side with the switch, within reach of the foot switch at all times.
- Stop immediately if the pipe binds, wobbles or the chuck slips.
- Wait for the pipe to stop completely before touching it, wiping it or measuring threads.
- Use only one operator; a helper should stay clear of the rotating pipe.
- Wipe up oil drips to prevent slips.
- Ream pipe ends and handle burrs and metal chips carefully.
Gloves and rags are the wrap-up hazard. Many manufacturers warn against wearing gloves near rotating pipe. If gloves are needed for oily or sharp pipe, wear snug ones, keep them off the turning pipe, and never wrap a rag around your hand to hold or wipe spinning pipe.
Portable power drives
- Always use the support arm or a pipe vise to take the torque; never rely on your body to hold it.
- Brace for kickback when the die binds.
- Use the switch that requires you to hold it on, and release it to stop.
Cutting oil
Cutting oil can irritate skin and cause rashes. Wash it off at breaks, and don’t keep oily rags in your pockets. Store used rags in a closed metal container. See Oily Rags.
Standards & references
- 29 CFR 1926.300: Tools, general requirements (construction)
- See also: Plumbing & Pipefitting · Pipe & Tubing Cutters
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