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In-Service AST Inspection Report <br /> Formal External Inspection of 8,500 Gallon Tank(AST-6) <br /> Valley Pacific Petroleum Services,Inc. <br /> Page 4 <br /> 1.9.2. The Tank was equipped with three 2-inch diameter normal vents which terminated <br /> approximately 15 feet above ground level and were observed to be in working <br /> condition. The tank was equipped with emergency relief venting (long bolt <br /> manways) installed as required by the National Fire Protection Association <br /> (NFPA)uniform fire codes and NFPA 30 flammable and combustible liquid codes. <br /> 1.9.3. Pneumatic tank liquid level gauges for three compartments were installed and <br /> visible along the northwestern containment wall. Condor inspectors manually <br /> measured the tank volumes to compare against installed tank level gauge readings. <br /> The northern compartment manual measurement was 42-inches; 2.5-inch higher <br /> than the gauge reading of 39.5-inches.The product level in the center compartment <br /> measured 29.5-inches. The center compartment liquid level gauge was non- <br /> operational during the time of the inspection. The product level in the southern <br /> compartment measured 63-inches; 3-inches higher than the gauge reading of 60- <br /> inches. Overfill alarms or vent whistles were not installed. <br /> 1.10. Grounding equipment was not installed on AST-6. <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. <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 0.262-inches of remaining steel. The original thickness of the northwest tank <br /> head is presumed to be approximately 0.250 inches or 1/4-inch rolled steel with an average <br /> of 0.224-inches of remaining steel. The original thickness of the southeast tank head is <br /> presumed to be approximately 0.250 inches or 1/4-inch rolled steel with an average of <br /> 0.261-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. <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 consistent <br /> with the original design.No evidence of modification to the original tank was identified. <br /> 3.3 INSPECTION SUMMARY <br /> The following sections provide a summary of the inspection completed for the tank. <br /> i CONDOR <br />