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0 0 <br /> 2. The tank has a flat spot which has a maintain a minimum velocity of 200 feet per <br /> cross measurement greater than the minute to remove all smoke, outgassing or <br /> radius of the tank endcap; vaporization of toxic and/or flammable <br /> substances from the tank. Additionally, tanks <br /> shall be ventilated by an eductor in accordance <br /> 3. The tank has a dent which has a with section A5.2.3.3(1) or other suitable <br /> cross measurement greater than the means. <br /> radius of the tank endcap or which <br /> portrudes into the tank greater than one <br /> inch for every foot of tank radius; A10.4.5.4 Testing of flammable vapor and <br /> oxygen concentrations shall be continuous <br /> 4. The tank has a seam split greater during welding. Vapor monitoring shall be <br /> than 1/2 inch wide or greater than 1/6 within 3 feet of where the welding is being <br /> the circumference of the tank in length. performed, monitoring the vapors at the tank <br /> bottom(see A5.2.4.1). <br /> A10.4.4 Repair of breaks or splits in joints <br /> (seams) shall be by welding in accordance with <br /> section A10.4.5. A10.4.5.5 Weld repair of perforations in the <br /> tank shell or heads shall be by continuous <br /> welding of the steel plate(s) edges to the <br /> A10.4.5 WELD REPAIRS existing tank wall. The plate(s) shall overlap the <br /> perforation(s) by at least 1 inch. Steel plates <br /> A10.4.5.1 Ventilation of the tank interior shall used as weld repairs shall be equal or greater <br /> be accomplished by blowing air into the tank to than the original tank metal thickness and match <br /> form a positive pressure within the tank. See the contour of the existing tank wall. Original <br /> also API Publication 2009 for more information tank metal thickness shall be based on the <br /> on weld repair precautions. original tank metal thickness as listed below by <br /> the tank capacity and diameter. <br /> A10.4.5.2 Welding shall not be performed until <br /> the tank has been abrasive blasted to white <br /> metal or, if lined, the lining shall be removed at <br /> least 6 inches in all directions from the area to Capacity Diam. Original <br /> be welded. If lined, the lining shall be <br /> thoroughly cleaned and dried of any visible Thickness <br /> liquids prior to welding. U.S.gallons Inches Inches <br /> Up to 285 42 0.067 <br /> 286 to 560 48 0.093 <br /> 561 to 1100 64 0.123 <br /> A10.4.5.3 Respiratory protection shall be worn 1101 to 4000 84 0.167 <br /> by personnel in the tank. A freely moving 4001 to 12000 126 0.240 <br /> exhaust hood shall be used for control of fumes 12001 to 20000 144 0.302 <br /> generated during welding. Hoods shall be within <br /> 12 inches of the area being welded and shall 20001 to 50000 144 0.356 <br /> 2n <br />