Boiler tube bank repair

Details Boiler tube bank repair Boiler tube bank repair

1993-11-17

1994-10-18

Bilinsky, Z. R.

Gear cutting, milling, or planing

Milling

Process

408 1R, 408 80, 409180, B23B 3500

Patent

active

053562488

ABSTRACT:
A method for repairing boiler tube walls by cutting out and replacing a worn or damaged section thereof involves the use of a power tool having a rotary milling head specially adapted to remove membrane material from between tube ends which are exposed when the damaged section is removed. The method and apparatus of the invention allows for the rapid and precise removal of membrane material from between the exposed tube ends to facilitate subsequent bevelling and welding operations, while substantially reducing the risk of weakening or damaging the tube wall by avoiding excess removal of material therefrom.

REFERENCES:
patent: 3759625 (1973-09-01), Iversen
patent: 3999452 (1976-12-01), Larsen
patent: 4498820 (1985-02-01), Brennan
patent: 4633555 (1987-01-01), Legge
patent: 4761104 (1988-08-01), Hillestad
patent: 5007778 (1991-04-01), Hillestad et al.
patent: 5033347 (1991-07-01), Hillestad et al.
patent: 5044075 (1991-09-01), Brennan et al.
patent: 5171111 (1992-12-01), Kishimoto

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