Inside a boiler, condenser or heat exchanger, there can be hundreds of tubes. Each one passes through a thick steel plate called a tube sheet. And every single tube has to be sealed tight in that plate, or water and steam start leaking where they shouldn’t.
That’s the job of a tube expander. You push it into the end of the tube and it rolls the tube wall outwards, a tiny bit, until it presses hard against the hole. No welding needed.
How a Powermaster tube expander works?
A powermaster tube expander has a tapered pin in the middle, called a mandrel, with small rollers around it. As the mandrel turns and moves forward, it pushes the rollers out. The rollers press on the inside of the tube and stretch it a little.
You don’t do this by hand on a big job. The expander is fitted to a drive, which can be air, electric or hydraulic. Some setups also have a torque controller, so it stops at the same tightness on every tube.
Honestly, that’s the part people care about most. When you’re rolling 800 tubes in a shutdown, you want tube 800 to be as tight as tube 1.
Condenser tube expanders and boiler tube expanders
Powermaster splits its range into two main groups.
Condenser tube expanders are for thinner tubes, the kind you find in power plant condensers and heat exchangers. Series like the 800, 900, 1200 and 1300 fall here.
Boiler tube expanders are built for thicker boiler tubes. These include the A, AF3 and P-1000 series, along with models that have bearings or a collar. There’s even an SB series made for sugar mill boilers.
What Affects Tube Expander Price?
People often ask for a single tube expander price, but it really depends on what you need.
The tube size is the first thing. A small condenser expander costs less than a large boiler one. The number of rollers matters too, since an expander with more rollers usually costs more. Then there’s the drive. A basic air drive is cheaper than an electric drive with a torque controller.
Don’t forget spares. Rollers and mandrels wear out, and on a big job you’ll go through a few. It’s worth asking for the price of a spare set at the same time.
Before you ask for a quote
Have your details ready. You’ll need the tube’s outer diameter, wall thickness and material, plus the thickness of the tube sheet. If you know how many tubes you’ll be rolling, mention that too. With this, you’ll get a much more accurate tube expander price, and the right model the first time.
Conclusion
A powermaster tube expander helps you seal tubes evenly and without welding, whether it’s a condenser or a boiler. Price depends on size, rollers and drive, so share your tube details up front.
Tube Expanders lists powermaster condenser and boiler tube expanders, along with air, electric and hydraulic expansion systems, used in over 120 countries.