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section Safety <br /> bulletin 3 <br /> date 2/1/91 <br /> page 3 of 6 <br /> The safety observer is not to enter the tank for rescue if the man can get <br /> out himself. <br /> If physical rescue is required, the safety observer is to; <br /> A. Summon the backup man (sound air horn if necessary) . DO—NOT ENTER <br /> the tank without back-up present. <br /> B. Attempt to pull the technician toward the entry hole by means of <br /> the lifeline. <br /> C. Attach lifeline to safety harness. <br /> D. Put on the SCBA and test operation. <br /> E, Enter the tank and assist in the rescue and removal of the man, <br /> after the stand-by person is present at the tank entry hole , <br /> 2, &Pmove_-All Possible Product <br /> Use a hand pump or approved flammable fluid pump to remove as much <br /> product as possible. No more than 1" of product should be in the tank <br /> prior to ventilation. Remove submersible pump if it is accessible. <br /> 3 , Start Ventilation <br /> Connect an approved air mover to exhaust air from the fill pipe or <br /> other pipe or hose within 12" of tank bottom. The air mover must be <br /> grounded when in use, Extend exit point of exhaust at least 6' above <br /> grade. <br /> Continue to ventilate until test with the combustible gas meter <br /> indicates the LEL is less than 10% within 12" of tank bottom. Remove <br /> fill pipe to check. This can take between 2 and 24 hours depending on <br /> the amount of product left in the tank. <br /> If tank lines are manifolded, the line to the tank to be entered might <br /> have to be broken and blanked off to isolate the tank and allow <br /> defuming of the tank. <br /> 4. Cut E_ntXy Hole <br /> Cut entry hole only after tests confirm the vapor level within 12" <br /> of the tank bottom is less than 20% of the LEL. Use only an air <br /> powered saw. The minimum hole size to facilitate rescue if required is <br /> 24" x 24" . <br />