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In-Service AST Inspection Report <br /> Formal External Inspection of 10,000-Gallon Tank(AST-3) <br /> Valley Pacific Petroleum Services,Inc.-Stockton Facility <br /> Page 4 <br /> 0 One bottom side 1-inch NPT coupler with a threaded plug approximately 2- <br /> inches northwest of the center support saddle. <br /> 1.9.2. The tank was equipped with two 2-inch diameter normal vents which terminated <br /> approximately 15 feet above ground level and were observed to be in working <br /> condition. The vent covers were missing from the end of the vent pipe. The tank <br /> was equipped with emergency relief venting installed as required by the National <br /> Fire Protection Association(NFPA)uniform fire codes and NFPA 30 flammable <br /> and combustible liquid codes. <br /> 1.9.3. Tank liquid level gauges for both compartments were installed and visible along <br /> the northwestern containment wall. Condor inspectors used a graduated stick <br /> gauge to compare with installed tank level gauges. The northern compartment <br /> inspector measurement was 60.5 inches and matched the gauge reading of 60.5 <br /> inches. The product level in the southern compartment measured 25.5 inches; <br /> 0.5-inch lower than the gauge reading of 26 inches. Overfill alarms or vent <br /> whistles were not installed. <br /> 1.10. Grounding equipment was not installed on AST-3. <br /> 1.11. The tank was not equipped with stairways,handrails, or platforms. <br /> 1.12. Surface coatings observed on all surfaces of the tank shell, heads, and supports appeared <br /> to be in good condition. However, along the top of tank concentrated on the southeast end <br /> of the tank multiple instances of paint failure were observed. Maintenance of a tank's <br /> protective coating is strongly recommended to prevent external corrosion of the tank <br /> shell,pipe-fittings, and piping. <br /> 2. Original Shell Thickness of the AST <br /> 2.1. Original tank documentation was not provided for review. <br /> 2.2. The tank manufacturer was determined by examining the nameplate installed on the tank. <br /> 2.3. The tank's nameplate identifies it with an Underwriters' Laboratories (UL) designation. <br /> This indicates the tank is manufactured to the UL 142 specification for aboveground <br /> storage of flammable liquids. <br /> 2.4. According to several ultrasonic thickness(UT)measurements,the original shell thickness <br /> is presumed to be approximately 0.250 inches or 1/4-inch rolled steel with an average <br /> thickness of 0.243 inches of remaining steel. The original thickness of the tank's heads is <br /> presumed to be approximately 0.250 inches or 1/4-inch rolled steel with an average of <br /> 0.259 inches of remaining steel. <br /> 3. Horizontal ASTs <br /> 3.1. Shell plates, welds and ancillary equipment were inspected for indications of exterior <br /> corrosion, buckling, distortion due to stress, cracking, pinholes and mechanical damage. <br /> There were no signs of corrosion or damage on the exterior tank surface. Minor leakage <br /> from ancillary piping at both pumps mounted on the tanks topside. <br /> 3.1.1. UT measurements and visual inspection of the tank shell revealed no significant <br /> internal or exterior corrosion. Refer to the thickness measurements and <br /> photographs attached to this report. <br /> 3.2. The tank shell was inspected for indications of modifications that may have been made in <br /> the past. Brackets and platforms for ancillary tank equipment and piping appear <br /> consistent with the original design. No evidence of modification to the original tank was <br /> identified. <br /> V44_0o�, <br /> �� CONDOR <br />