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Extra info for Operator's Circular. Welding Theory and Application. reporting Errors and Recomending Improvements
Using a flexible tube or hose, direct a stream of exhaust gases into the container. Make sure there are sufficient openings to allow the gases to flow through the container. f. Allow the gases to circulate through the container for 30 minutes. g. Disconnect the tube from the container and use compressed air (minimum of 50 psi (345 kPa)) to blow out all gases. h. Close the container openings. After 15 minutes, reopen the container and test with a combustible gas indicator. If the vapor concentration is in excess of 14 percent of the lower limit of flammability, repeat cleaning procedure.
Generally, special ventilation or protective equipment other than that specified in paragraph 2-4 is not needed for protection from exposure hazards associated with welding with thoriated tungsten electrodes. d. Metal Fumes. The physiological response from exposure to metal fumes varies depending upon the metal being welded. Ventilation and personal protective equipment requirements as prescribed in paragraph 2-4 shall be employed to prevent hazardous exposure. Section V. 2-19. SAFETY PRECAUTIONS FOR WELDING AND CUTTING CONTAINERS THAT HAVE HELD COMBUSTIBLES EXPLOSION HAZARDS a.
C. Drain the solution thoroughly. d. Close all openings in the container except the drain and filling connection or vent. Use damp wood flour or similar material for sealing cracks or other damaged sections. 2-34 TC 9-237 e. Use steam under low pressure and a hose of at least 3/4-in. 05 mm) diameter.