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API 653 In-Service Inspection Report <br /> for <br /> Pacific Ethanol HMT Inspection <br /> Tank No. T-6105 ,august 7,2013 <br /> Stockton, CA Page 5 of 45 <br /> 2.0 SUMMARY AND REPAIR RECOMMENDATIONS <br /> The following is a summary of the significant findings of the inspection. <br /> FOUNDATION: The survey found the tank out of level by 0.21 inch. API 653 calculation <br /> for deflection of this tank is 0.12 inch. API maximum deflection permitted for this tank is <br /> calculated at 0.71 inch (ref. API 653, Para. B.2.2). Differential settlement for his tank does <br /> not exceed the API allowable (ref. API 653, Para. B.2.2).This tank is on a stable <br /> foundation (raised concrete pad). No corrective action or further evaluation of settlement <br /> is necessary at this time. Future settlement should be monitored at the next API 653 <br /> inspection. <br /> The concrete pad has random hairline cracks present. These areas should be monitored <br /> for further degradation. If the cracking worsens, suitable repairs should be implemented <br /> The moisture barrier has random areas of failed bond at the bottom edge projection, <br /> allowing water to enter under the tank bottom. A suitable moisture barrier should be <br /> installed around the entire tank bottom perimeter to minimize moisture from entering <br /> under the tank bottom which can lead to soil side corrosion. <br /> SHELL: Shell thickness calculations indicate the safe fill height of 40.0 feet can be <br /> utilized with product specific gravities up to 1.000. The hydrostatic test height can, <br /> therefore, utilize this maximum fill height (ref. API 653, Para. 4.3.3.2). These calculations <br /> do not take into account operational restrictions from such items as the high-level alarms <br /> or owner 1 operator-imposed safe fill restrictions. <br /> This tank is anchored against seismic and wind overturning loads with thirty-six (36) <br /> anchor bolts and chairs that are located every 32 inches (approximately) around the tank <br /> perimeter (centerline to centerline) and embedded into the concrete pad. These anchor <br /> bolts are each 1 inch diameter. Due to the number of anchor bolts presently installed, <br /> seismic and wind overturning anchorage is adequate as long as there is no corrosion <br /> metal loss to the bolts. <br /> There are no reinforcing plates present under the vertical ladder and automatic gauge <br /> supports. These details have been present for an extended period with no issues found <br /> and no corrective action is required at this time. These areas should be monitored in <br /> future for signs of accelerated corrosion due to possible increased stress concentrations. <br /> RECE11141IEZD <br /> APIRPTNE.IJQTREV 2 23262868ff-6105r(Rev 1) esICaY .[Ai4 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />