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66.22.17 Inspection and Maintenance of Aboveground Storage Tanks
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Pontoons in external floating roof tanks shall be inspected, at intervals not exceeding 5 years, by visual and atmospheric testing methods to ensure that the pontoon covers are mechanically secured to the floating roof deck and to ensure the pontoons do not contain liquids or vapors resulting from leaks or corrosion holes in the pontoons. If liquids, or flammable vapor concentrations at or above 25 percent of the LFL are found, the liquids or vapors shall be safely removed and the source of the leak shall be repaired. The finding of vapors at levels below 25 percent of the LFL shall result either in the implementation of monitoring of the tank pontoons at least annually to assure that vapors in the flammable range are not achieved before corrective action is taken or removal of the tank from service. Rim vents, if any, shall also be inspected to ensure that they are not frozen open. [30:22.17.4]
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