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J.M. Equipment Co.Inc.,Facility(11754), Used Oil Tank, 22§CCR 66265.192&STI-SP0011 November 2019 <br /> 4.0 Inspection <br /> 4.1 Results: <br /> 4.1.1 Foundation: <br /> The Used Oil tank is currently sitting in a steel container acting as secondary <br /> containment. The inspector was unable to determine what type of supports the horizontal <br /> tank is resting on. The tank is not secured to the steel container nor is the container <br /> secured to the foundation by any mechanical means. <br /> 4.1.2 Containment: <br /> The Used Oil tank is a single-walled tank that depends on the steel container as <br /> secondary containment. This containment is capable of containing 110% of the contents <br /> and is not exposed to precipitation. <br /> 4.1.3 Shell: <br /> The shell is constructed of carbon steel of unknown specification. It is a horizontal <br /> cylindrical design consisting of two (2) lap-welded courses. The shell exterior was <br /> visually inspected and appears in satisfactory condition. The coating was inspected for <br /> disbonding, adhesion, deterioration, and discoloration(See Section 4.1.6). A visual <br /> inspection was conducted over the exterior shell including the shell external welds. No <br /> discrepancies were noted on the welds. The minimum design thickness requirements per <br /> UL-142 for the tank is 0.093". The UT inspection of the tank revealed some indications <br /> that the wall thickness dropped below the requirements listed in UL-142. Thickness <br /> measurements are listed in the engineering data in Appendix B. <br /> 4.1.4 Heads <br /> A visual inspection was conducted over the heads including the head-to-shell weld. No <br /> discrepancies were noted on the welds. The coating was inspected for disbonding, <br /> adhesion, deterioration, and discoloration (See Section 4.1.6). The minimum design <br /> thickness requirements per UL-142 for the tank is 0.093". The UT inspection of the tank <br /> revealed many indications that the wall thickness dropped below the design requirements <br /> listed in UL-142. Thickness measurements are listed in the engineering data in Appendix <br /> B. <br /> 4.1. Appurtenances: <br /> Inspected and evaluated each tank nozzle in accordance with STI SP-001. Evaluated all <br /> nozzles and reinforcement plates for leaks and corrosion. Normal venting is not being <br /> provided to the primary tank. The normal venting shall be at least as large as the filling or <br /> withdraw connection per UL-142 Table 8.2. The tank is not equipped with an emergency <br /> vent. Every aboveground storage tank shall have emergency relief venting...that will <br /> relieve excessive internal pressure caused by an exposure to fire (NFPA 30 22.7.1.1. The <br /> Used Oil tank does have a Murphy 16-06-1117C Liquid Level Device installed for the <br /> purpose of measuring the liquid level. <br /> 5 <br />