Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1989-07-17
1990-12-25
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
2940208, 2940213, 294264, 29428, B23P 700
Patent
active
049792946
ABSTRACT:
An improved method for the speedy and efficient repair of tubes contained in a furnace boiler waterwall involves milling an elongated slot at each end of a damaged tube section in a water wall, which section is thereafter cut away and replaced with a replacement tube section having elongated slots milled at each end which are cut to mate to existing tubes. The replacement tube section and existing tubes are aligned to form elongated slots through which interior welds are made to secure the replacement tube section. The elongated slots are then closed with covers cut from a second section of replacement tubing, and the water wall web is attached to the replacement tube section to complete the repair. Also disclosed are a milling machine used to mill the elongated slots, and drill and saw fixtures to aid in cutting away the damaged tube section. The improved method and apparatus enhance the precision and uniformity with which boiler tube repairs may be made, increase access to perform internal welds in boiler tubes and permit some prefabrication of necessary repair parts, thus reducing furnace down time for repair.
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National Board Inspection Code, III Repairs & Alterations to Boilers & Pressure Vessels by Welding, Dig. 8 Tube Window Patching Method.
Bowman Paul W.
Estill Andrew F.
Gatherwright Michael D.
Smith Robert L.
Cuda I.
Goldberg Howard N.
The Dayton Power & Light Company
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