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API 653 In-Service Inspection Report �� ■� <br /> for =W =W <br /> Inspection <br /> Pacific Ethanol <br /> Tank No. T-7704 Augusts,2013 <br /> Stockton, CA Page 5 of 42 <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 0.06 inch. API 653 <br /> calculation for deflection of this tank is 0.03 inch. API maximum deflection permitted for <br /> this tank is calculated at 0.08 inch (ref. API 653, Para. B.2.2). Differential settlement for <br /> his tank does not exceed the API allowable (ref. API 653, Para. B.2.2).This tank is on a <br /> stable foundation (raised concrete pad). No corrective action or further evaluation of <br /> settlement is necessary at this time. Future settlement should be monitored at the next <br /> API 653 inspection. <br /> The concrete pad foundation has random hairline cracks present. These areas should <br /> be monitored for further degradation. If the cracking worsens, suitable repairs should be <br /> implemented. <br /> There is no moisture barrier in place at the bottom edge projection allowing water to <br /> enter under the tank bottom. A suitable moisture barrier should be installed'around the <br /> entire tank bottom perimeter to minimize moisture'from entering under the tank bottom <br /> that can lead to underside corrosion. <br /> SHELL: Shell thickness calculations indicate the safe fill height of 28.75 feet can be <br /> utilized with product specific gravities up to 1.050. The hydrostatic test height can, <br /> therefore, utilize this maximum fill height(ref. APE 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 twelve (12) <br /> anchor bolts and chairs that are located every 46.5 inches (approximately) around the <br /> tank perimeter (centerline to centerline) and embedded into the concrete pad. These <br /> anchor bolts are each 1.25 inches diameter. Due to the number of anchor bolts presently <br /> installed, seismic and wind overturning anchorage is adequate as long as there is no <br /> corrosion metal loss to the bolts. <br /> RECEVvE <br /> . <br /> 1 <br /> 1 <br /> APIRPTNE.DOT REV 2 232626688-7704r(Rev 1) 11!61 1r2: ' 2014 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />