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• <br />1.0 GENERAL <br />1.1 This standard covers the inspection of shop fabricated steel tanks built to a <br />nationally recognized standard for aboveground storage tanks that are <br />intended for the aboveground storage of noncorrosive, stable, flammable, and <br />combustible liquids having a specific gravity not exceeding that of water. <br />1.2 The purpose of the inspection shall be to determine the condition of the tank <br />and whether it is leaking. <br />1.3 The scope is limited to the tank foundation, supports, inner and outer walls, <br />piping to the face of the first flange, the first threaded joint, or the first welded- <br />end connections, including normal and emergency vents. Other accessories <br />are not included. <br />1.4 This Standard is intended for use by organizations and/or individuals who are <br />knowledgeable and experienced in aboveground tank inspection. Applicable <br />federal, state and local laws, regulations and ordinances concerning tank <br />inspection shall also be consulted. <br />1.5 Consult the tank manufacturer prior to making any alterations or repairs to a <br />tank. <br />0 2.0 DEFINITIONS <br />2.1 Aboveground storage tank-a tank which is wholly aboveground, i.e. not <br />partially buried. The tank may be resting on the ground, or set on supports, <br />such as saddles, skids, legs, etc. It may be installed in an underground vault. <br />2.2 Primary tank-for tanks which are single-wall, it is the containment tank. For <br />double-wall tanks, it is the inner tank. <br />2.3 Secondary tank-for tanks which are double-wall, it is the outer tank. <br />2.4 Double wall tank-an aboveground storage tank with a tank contained within a <br />containment tank. This will form an interstitial (annular) space between the <br />two tanks which is capable of being monitored for leakage into the space from <br />either the interior or exterior walls. <br />2.5 Single-wall tank-an aboveground storage tank with only one wall or shell. <br />2.6 Secondary containment dike-a structure which is intended to contain product <br />resulting from a spill, leak, or rupture of the tank. The tank may be either <br />single wall or double wall. The dike may be either open or closed at the top. <br />AST Inspection Standard 1 September 2000