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0 0 <br /> repaired. There shall be no holidays in the lining shall possess a minimum flexural strength of <br /> on final test. To maintain compliance with tank 20,400 psi, it shall be a minimum of 1/4" in <br /> tightness requirements of 40 CFR 280.33(d)(1), thickness, it shall be compatible with the <br /> perforations shall have been welded or sealed product stored, and it shall have center punch <br /> with metal plugs. Certification of the tank test marks along the perimeter for the drill not less <br /> shall be provided by the Contractor to the tank than 1 inch from the edge of the cover plate and <br /> owner using form AF2. the tank access opening with a maximum of 5 <br /> inches between holes when measured from <br /> center to center. <br /> A13.1.4 Any above test failures shall require <br /> correction in accordance with the lining material <br /> manufacturers specifications and retesting until A14.1.4 The cover plate may be used as a <br /> the above testing specifications are met. template. 21/64" holes shall be drilled through <br /> the tank a minimum of 1 inch from the tank <br /> access opening. When using a fiberglass cover <br /> A13.1.5 Prior to closing a tank, air pressure plate, the holes are to be drilled through the <br /> tightness tests of the piping may be conducted cover plate and tank. When using a steel cover <br /> from the interior of the tank if required. plate, the 21/64" drilled holes into the tank wall <br /> are to be centered in the 3/4 inch diameter holes <br /> A14.0 TANK CLOSING of the steel cover plate. <br /> A14.1 If an opening has been cut, the tank shall <br /> be sealed as follows: A14.1.5 Steel cover plates shall be abrasive <br /> blasted to white metal on all sides. The tank <br /> A14.1.1 A 7 gauge minimum thickness steel or a shell exterior which will be under the cover <br /> 1/4 inch minimum thickness fiberglass cover plate and within 6 inches of the cover plate shall <br /> plate, formed to the contour of the tank, shall be abrasive blasted to white metal and covered <br /> be made to overlap the access opening at least With the manufacturers recommended lining <br /> two inches on each side. materials. Fiberglass lids shall be abrasive <br /> blasted on the interior and exterior edges <br /> inward a minimum of 3 inches from the <br /> A14.1.2 A steel cover plate shall have 3/4 inch perimeter of the lid. <br /> diameter holes along the perimeter. The holes <br /> shall not exceed 5 inches of separation between <br /> holes when measured from center to center, nor A14.1.6 Before the lining materials on the <br /> shall the holes be located less than 1 inch from exterior tank shell cures, the cover plate shall be <br /> either the edge of the cover or tank access fastened to the tank using minimum 3/8 inch <br /> opening. diameter by 1-1/2 inch long (minimum) bolts <br /> with washers minimum diameter of 1-1/2 inches <br /> (see figure 6). <br /> A14.1.3 When a fiberglass reinforced plastic <br /> (FRP) cover plate is used, the weight of the <br /> fiberglass shall be a minimum of 22 percent of A14.1.7 When not using self tapping bolts,the <br /> the overall weight of the fiberglass and resin,it bolt shafts are to be placed through the holes <br /> ?.6 <br />