COMPLIANCE INFO_2012 - 2014 - Laserfiche WebLink

Home Browse Search

and be equipped with a filter so that in the event that you accidentally draw product into the hose, the filter will prevent the product from reaching the instrument and damaging it. 7.8.1.11. First, test for oxygen levels with a Xerxes-supplied, calibrated oxygen monitor. Record the results on the Tank Entry Work Permit. 7.8.1.12. Second, test for flammable vapor using a Xerxes-supplied, calibrated combustible-gas indicator. This instrument will detect if any flammable vapors or gases are present and, if so, indicate the amount of vapors or gas present in the atmosphere as a percentage of the lower explosive limit (%LEL). You are prohibited from entering a tank if flammable vapor concentrations exceed 10% LEL. Record the results on the Tank Entry Work Permit. 7.8.1.13. Third, test for toxic substances if product residue may still be in the tank. Do not enter a tank that has not been emptied of product and double rinsed at a minimum. If there is residue remaining in the tank that may contain product vapors, the site supervisor must determine what potential toxic substances are likely to be encountered and then determine the vapor levels. Record the results on the Tank Entry Work Permit. 7.8.1.13.1. If the tank's most recent product was a petroleum product, such as gasoline, first test for benzene vapors. Place a detector tube, specifically designed to test for benzene vapors, into an extension hose connected to a gas-detector pump, lower the tube into the tank within 12 inches of the tank bottom and draw a sample of air according to the instructions included with the detector tubes. 7.8.1.13.2. Raise the detector tube out of the tank and read the stain (if any). Record the results on the Tank Entry Work Permit. 7.8.1.13.3. Refer to Table 2 to determine how to proceed if a stain is detected on the detector tube. 7.8.1.13.4. If toxic vapor levels exceed those listed in Table 2 for safe tank entry, do not enter the tank. Continue to vent the tank for an additional 30 minutes at a minimum and then test again for benzene vapors with a new detector tube. If vapors do not fall below acceptable levels, call the field service coordinator or plant manager before proceeding. Do not enter the tank for any reason. 7.8.1.13.5. Repeat this process for quantifying other petroleum hydrocarbon vapors by using a different detector tube designed specifically for a wide range of petroleum hydrocarbons. 7.8.1.13.6. If results and conditions are acceptable, enter the tank with a full-face respirator and test again for both benzene and other petroleum hydrocarbon vapors at the opposite end of the tank and in areas where product has collected. If vapors exceed those listed in Table 2 for safe tank entry without a respirator, evacuate the tank and reassess I 26