Over time, fireside tube wastage typically results in the need to replace generating bank tubes, including the stub ends rolled into the tube seats of the steam and mud drums. When it comes to generating bank re-tubing, rely on the proven Induction Heat Tube Extraction technology from B&W.
At B&W, we know that minimizing job cost and boiler downtime, as well as boiler drum shell preservation, are critical; you can’t afford to take chances with tube stub removal.
- Patented technology
- Quick and efficient tube stub removal
- Safe and clean
- Eliminates risk of tube seat and ligament damage
- Reduces or eliminates need for subsequent drum shell repairs
B&W has developed two unique methods for removing tube stubs from tube sheets and drums:
Heat and Pull
The Heat and Pull method rapidly heats the tube stubs in situ to 1000C, using a specially designed induction coil, which causes plastic deformation due to thermal expansion under restraint by the tube sheet (drum). The tube stub is extracted by hydraulic jacking from outside the drum while induction heating from inside the drum. The Heat and Pull method is particularly suited for the removal of heavily over-expanded tube stubs from headers and drums. Prior bell removal is not required, as the bell collapses and is pulled through with the stub.
Heat and Shrink
The Heat and Shrink method heats the tube stubs in situ to 1000C, using a specially designed induction coil, to cause plastic deformation due to thermal expansion under restraint by the tube sheet (drum). When cooled, such as by the application of compressed air to the tube, the tube shrinks, breaking contact with the drum and providing for ease of removal. The tube stub can then be easily driven out of the tube bore.