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Po Box 1928 API 653 SIMILAR SERVICE <br /> P0 M0 BeNICIA,L7073A94510 <br /> TEL 707 334 3400 KRK PETROLEUM TRACY,CA <br /> FAx 707 926 2684 <br /> ENGINEERING$INSPECTION,INC www•powersei.com Tank 2 (Candidate Tank) <br /> EXECUTIVE SUMMARY <br /> Powers Engineering and Inspection was contracted by KRK Petroleum to evaluate and provide <br /> an API 653 Similar Service Assessment for scheduling the next Out-of-Service Inspection(s) for <br /> Candidate Tank 2 at the YRC Freight Terminal facility in Tracy, CA with Control Tank 3 at the <br /> same facility. <br /> Tank 2 was constructed in 1991 by Brown Minneapolis Tank. The tank is a 24-ft diameter x 24-ft <br /> tall with a butt-welded shell with a cone roof. The tank is currently in Diesel service. <br /> Next <br /> Inspection Methods Results <br /> Scheduling Employed <br /> Goal <br /> 1 Determine if Review of • Review of Terminal Records provided by KRK <br /> the proposed Storage Tank Petroleum confirms that Tank 2 has stored Diesel <br /> similar Inspection and products and was constructed in a manner similar <br /> service construction to sister tank 3 (Class A — Crude oil per API 653 <br /> requirements records Table H.1). Tank 3 has stored Diesel. Tanks 2 and <br /> have been 3 were installed in 1991 and both had 5/16-in <br /> met. bottoms built to API 650. <br /> • Both candidate Tank 2 and control Tank 3 are <br /> located at the YRC Freight Tracy, CA facility in the <br /> same tank farm, sharing the same environmental <br /> conditions. <br /> o Both tanks are near identical in design and build <br /> (see similar service data sheet below for more <br /> information). <br /> 2 Determine o Visual inspection. • Candidate Tank 2 and control Tank 3 were <br /> remaining life . Review of constructed with an 5/16-in lap welded bottom on a <br /> for Tank terminal records concrete ring wall foundation. <br /> Bottom and historical • In 2011, an MFL scan was performed on the <br /> tank report bottom of control Tank 3 resulting no signs of <br /> bottom inspection significant soil-side corrosion. <br /> data. . The control Tank 3 was visually inspected with only <br /> minor product side corrosion identified (<0.04-in <br /> deep) mainly along triple lap joints. <br /> • Similar service corrosion rates were based on data <br /> from a previous Powers Engineering and <br /> Inspection in 2011 for control Tank 3. <br /> • Using the most recent data from control Tank 3, the <br /> calculated corrosion rate is 0.00263 in/year. <br /> • The thresholds for repairs for control Tank 3 utilized <br /> in 2011 were 0.100-in remaining for the bottom and <br /> 0.170-in remaining for the bottom annular (annular <br /> late t-min from API 653 Table 4.5). <br /> 3 Determine e Visual inspection. • Inspection of the shell courses on control Tank 3 <br /> remaining life . Review of was performed in 2016. UT drops performed on <br /> for tank shell terminal records control Tank 3 during the internal inspection in 2016 <br /> and historical indicated nominal thickness along the shell courses. <br /> tank report Inspection intervals will be based on specified <br /> bottom inspection intervals from API 653. In some cases, shell <br /> API 653 SIMILAR SERVICE YELLOW FREIGHT TANK 2 TRACY,CA 2019.DOCX Page 2 of 21 Date Printed:614119 9:53 AM <br /> ©2017 PE&I Inc. <br />