Thermo Int. – Induction Heating & Bolt Heating Specialists
Thermo Int. – Induction Heating & Bolt Heating Specialists
Replacing worn boiler tubes is demanding enough. Damage to the surrounding tube sheet can turn a planned maintenance task into additional repair work, higher costs and a longer outage.
Thermo International’s induction heating technology supports boiler tube removal by heating the tube section held within the tube sheet. This localized heating helps release the joint so crews can extract the worn tube with hydraulic pulling equipment.
For power plant engineers and maintenance teams, the goal is straightforward: remove the tube efficiently while limiting damage to the structure that needs to remain in service.
Boiler tubes operate under demanding conditions. Heat, pressure cycling and corrosion can eventually make replacement necessary.
Removing the worn tube requires care, particularly where it is secured within a tube sheet. Cutting, chiseling and other mechanical removal methods can be labor-intensive. If the surrounding tube sheet is damaged, crews may need to complete additional repairs before installing the replacement tube.
That makes the removal method an important part of outage planning. The work involves more than getting the old tube out—it also involves preserving the joint area for the next installation.
Induction heating generates heat directly within electrically conductive metal.
An alternating current flows through a specially designed coil, creating a changing magnetic field. That field induces electrical currents in the surrounding tube material. The metal’s resistance to those currents produces heat.
For a suitable boiler tube removal application, the process works as follows:
This differs from simply heating a freely expanding component. The tube’s confinement within the tube sheet is central to the removal mechanism.
The inductor transfers energy electromagnetically; it does not need direct electrical contact with the tube to generate heat.
The tube sheet must remain suitable for the replacement tube. Localized induction heating can reduce reliance on aggressive mechanical work at the joint, helping limit damage and the repairs that could follow.
Results depend on the tube material, joint condition, equipment setup and removal procedure.
A controlled heating process can help crews prepare the tube for hydraulic extraction. Where it reduces difficult removal work or subsequent repairs, it can also help the maintenance team stay closer to its planned schedule.
Heating time is only one part of the job. Access, joint preparation, pulling, inspection and replacement all contribute to the total maintenance duration.
An application-specific internal coil directs energy into the tube section that needs treatment.
Nearby metal can still warm through conduction, so coil placement, heating duration and temperature monitoring remain important. The objective is to achieve the required tube condition while managing heat transfer into the surrounding assembly.
Consistent coil positioning and defined operating parameters help crews repeat the process across similar tube joints.
That repeatability can be useful during projects involving multiple tubes, particularly when the team establishes the heating and extraction sequence before work begins.
Suitability requires an application review.
Tube material, diameter, wall thickness, access and attachment method all affect the proposed removal process. A welded connection, for example, may require additional preparation before extraction.
Providing drawings and photographs early helps identify these requirements. Thermo International can assess the heating application and help match the power supply and internal coil to the work.
A practical boiler tube removal setup includes more than the induction power supply.
Depending on the application, the project may require:
Thermo International supplies induction power supplies, chillers, recording equipment, transformers, custom coils and related accessories. Discussing the complete job helps clarify what the heating package includes and what the site must provide.
Different projects call for different equipment arrangements.
A defined tube replacement project may suit a rental. Facilities or service companies with recurring induction heating work may prefer to purchase equipment. Thermo International also offers rental arrangements with an option to buy.
The useful comparison is the total cost of completing the work: equipment, accessories, transportation, setup, labor and potential rework.
Discuss your project duration and anticipated future applications with Thermo International to assess the appropriate arrangement.
Before requesting an equipment recommendation, gather:
These details help turn an initial inquiry into a practical heating plan.
Based in Flanders, New Jersey, Thermo International develops induction heating equipment and accessories for power generation and heavy industrial maintenance.
Whether you are replacing worn boiler tubes or evaluating a different removal method for an upcoming outage, our team can help assess the application and identify the heating equipment it requires.
Send us your tube dimensions, joint details, photos and project schedule. Let’s discuss how induction heating could support your next boiler maintenance project.
Call 973-970-9500
Visit ThermoInternational.com