Struggling With Leaking Boiler Tubes? Choose the Right Expanding Tools



Any leak in the boiler tubes can lead to major downtime, cost you money from high repair bills, and reduce the efficiency of your equipment. The reason for a leak can be due to poor rolling of the tube and the tube sheet joint.

Choosing the proper tube expander tool allows your technician to get an evenly rolled and tightly sealed connection each time. Knowing how the boiler tube expanders work and selecting the appropriate tool for you ensures that leaks won’t occur.

Why Do Boiler Tube Joints Develop Leaks?

There is huge stress on the boiler tubes because of the high temperatures, pressures, and heating/cooling cycles that they have to endure. When there is under-rolling of the tubes into the tubesheet, small openings remain that lead to leakage of steam or water. Conversely, over-rolling results in compression of the walls of the tube, failure of the joint, and shortened lifetime of your equipment.

This problem mostly occurs due to improper selection of the right tool, incorrect settings of the tool, and incorrect rolling process. The key to success lies in proper expansion of the tube.

How Does an Expander Tool Improve Tube Joint Quality?

An expander tool applies smooth mechanical force to press a metal tube tight against the inside of the tubesheet hole. This perfect fit keeps the tube in position and provides a perfect seal when the procedure is done in accordance with proper working procedures.

Expansion is done through the use of steel rollers surrounding a mandrel, which is a tapered steel pin. The rolling action of the mandrel causes the rollers to expand the tube uniformly by pushing outwards against the inner wall of the tube.

What Should You Consider When Choosing Boiler Tube Expanders?

Choosing a boiler tube expander depends on the evaluation of certain critical facts regarding your particular application setup.

  • Expansion specification: Always adhere to the target expansion specifications to avoid over-expansion or under-expansion of tube walls.

  • Material compatibility: Different metals react differently under pressure; therefore, ensure the expander is compatible with the tubing hardness.

  • Tube dimensions: Determine the tube dimensions, such as outer diameter, wall thickness, and holes in the tubesheet, before purchasing the tool.

  • Tool compatibility: Ensure your tool connects easily to your drive motor and fits your work area.

Running through these quick steps helps techs roll consistent joints, skip annoying rework, and keep boilers running reliably.

How Can Better Tube Expansion Reduce Maintenance Costs?

Correct expansion of the tubes is an effective method to prevent unnecessary leak repair costs and avoid unnecessary replacement of the tubes. Rollers and mandrel inspection, along with correct tool adjustment and following the manufacturer’s guidelines, can also assist in achieving consistency in results. Standardization in tube preparation and tube expansion can reduce inconsistencies.

Conclusion: 

The basics of good tube joints start with using the right equipment, measuring, and expansion. The use of the right equipment helps the maintenance crew avoid the chances of leakage, maintain the integrity of the tube, and improve the efficiency of the boiler.

POWERMASTER provides various industrial tools that are specialized in tube handling and installation. The company has different tube expanders and other industrial equipment, which makes it possible for experts to handle various tube dimensions according to the needs of the application.

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