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API 510 In-Service Inspection Report <br /> for Inspection <br /> Ethanol <br /> Vessel No. VS-6104 August 6,2013 and January 9,2014 <br /> Stockton, CA Page 6 of 29 <br /> INSPECTION SUMMARY (CONT'D.) <br /> Heads: Visual (VT) inspection of the tank heads noted random areas of minor coating <br /> failure with dirt stains and rust present. This condition does not affect the overall <br /> integrity of the tank. This is provided as information only and consideration should be <br /> given to monitoring and maintaining the tank coating as necessary. <br /> Ultrasonic (UT) testing of the tank heads revealed a minimum remaining thickness of <br /> 0.448 inch and an average thickness of 0.472 inch. The nominal thickness of the tank <br /> heads (per data plate) is 0.438 inch. <br /> Nozzles: It should be noted that this was an external inspection only and no inspection <br /> of the internal nozzles was performed or required at this time. <br /> The nozzles have random areas of coating failure with surface rust present, particularly <br /> on the flange, bolts and threads. Consideration should be given to properly cleaning and <br /> coating these details as necessary to minimize future corrosion. <br /> The nozzles and coupling welds were found in acceptable condition based on Visual <br /> (VT) inspection. <br /> It should be noted that there is a sight gauge present for monitoring product level. This is <br /> stated here for information only. Visual (VT) inspection of this device found it in <br /> acceptable condition at this time. <br /> Venting 1 Pressure Relief Device: The tank has a 6-inch pressure 1 vacuum vent <br /> present working with 6-inch product nozzles (fill and service lines). It should also be <br /> noted that there is a 2-inch vacuum relief line present. Visual (VT) inspection found <br /> them in acceptable condition. Based on this information, tank venting appears to be <br /> adequate. <br /> RECOMMENDATIONS: Based on the recent operating history, the age of this vessel <br /> and the results of this inspection, no changes in current operating practices for this <br /> vessel are recommended at this time. Current operating temperature and pressure <br /> limits can be maintained until the next out-of-service (internal) inspection, which should <br /> be performed as soon as scheduling permits or at the next vessel outage, whichever <br /> occurs first. In-service (external) inspection should be conducted at 5-year intervals. <br /> R E E I V E D <br /> NOERPTNE.00T REV 2 23262868 Tank VS-6104r(Rev 1) 1�(OJT41:2(, j 014 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />