REPAIRING THICK-WALLED HIGH-PRESSURE VESSELS BY ELECTRIC ARC WELDING,
DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)
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A welding technique is described for weld build-up of damaged areas in thick-walled vessels and to restore reaction columns and heat exchangers. Three columns and a heat-exchanger were kept under observation during one operating year. The equipment worked at a pressure of 280-300 atmospheres and a temperature of 350-390C inside the reaction columns and 200-350C in the heatexchangers. According to the readings of surface thermocouples the temperature of the outer walls of the apparatus fluctuated within the limits 160-220C. Only in some units was there observed a local overheating to temperatures 250-300C. Visual examinations showed that no visible defects whatever had developed in the repaired areas on the vessel walls.