Laserfiche WebLink
STI External Tank Inspection <br /> UPRR—Stockton yard,Stockton,CA TNKO-0295 <br /> June 2019 <br /> anteagroup <br /> 2.6 INSPECTION INTERVAL <br /> Next Formal External Inspection(Fel)Interval <br /> Formal external inspection interval as determined from STI-SP001 standards shall not exceed 20 years. <br /> Next formal external inspection due before 5/15/2039. <br /> Next Formal Internal Inspection(FII)Interval <br /> Due to the size of the tank and the spill control,no Formal Internal Inspection interval was conducted in <br /> accordance with STI-SPD01. <br /> 2.7 DEFINITIONS <br /> Continuous Release Detection Method(CRDM) <br /> A means of detecting a release of liquid through inherent design. CRDM is passive because it does not require <br /> sensors or power to operate. Liquid releases are visually detected by facility operators. The system shall be <br /> designed in accordance with good engineering practice. <br /> Several acceptable and commonly used CRDM systems are as follows: <br /> • Release prevention barrier(RPB)(described in definition of release prevention barrier). <br /> • Secondary containment AST,including double-wall AST or double-bottom AST. <br /> • Elevated AST,with or without release prevention barrier. <br /> Release Prevention Barrier(RPB) <br /> A liquid containment barrier that is installed under the AST.Its purpose is to divert leaks toward the perimeter of <br /> the AST where they can be easily detected,as well as to prevent liquid from contaminating the environment.RPBs <br /> are composed of materials compatible with the liquid stored in the AST and meet appropriate engineering <br /> standards. Examples are steel (as in steel double bottom tanks), concrete, elastomeric liners or other suitable <br /> materials,provided the above criteria are met. <br /> Category 1(AST) <br /> The AST shall be repaired or replace if more than 3 square inches of any one square foot of the tank shell(i.e. <br /> approximately 2%)is found to be less than 50%of the original shell thickness,or if the remaining shell thickness <br /> of an area is less than 25%of the original shell thickness at any point. <br /> XINOGEM <br /> 9 us.artteagroup.com <br />