COMPLIANCE INFO_1986-2002 - Laserfiche WebLink

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Pumps used for the removal of Bottom Sediment and Water shall be explosion - proof. Shovels used to remove solid sludge shall be of the non-ferrous or sparkproof type. 7-3 Inspection of Tank Prior to Surface Preparation Inspection of the interior may be made with one of several forms of internal inspection lamps or flashlights approved for Class 1, Group D -Hazardous Locations. Visual inspection of the tank should be made to insure that no liquid gas or fumes are reentering the tank. Any foot valves shall be removed or covered tightly with plastic and taped. Submerged pumps should be isolated. Suction lines should be removed and openings plugged with rubber test plugs or equivalent. The vent opening should be left clear freely exposed from the inside. During inspection, the extent of corrosion (both internal and external) should be determined. The entire interior surface of the tank shall be visually inspected. Areas around holes or suspected severe corrsion and other randomly selected areas within the tank should be tested by tapping with a ballpeen hammer to determine structural integrity of the steel shell. A tank having extremely porous steel, a split seam or holes too large to be repaired, shall not be Glass Armor lined. In all cases, sufficient steel shell must remain intact (after sandblasting) to provide structural support for the interior lining. The following guidelines shall be utilized to determine whether a tank may be repaired: a. A tank having an open seam or split no longer than 3 inches, or b. Perforation no larger,than 11/2" diameter except under the gauging opening where the perforation may be no larger than 21/2 inches in diameter, or C. A tank with less than five (5) perforations none larger than 1/2 inch in diameter) in any one square foot area, d. A tank with less than twenty perforations (none larger than 1/2 inch in diameter) in a 500 square foot area. Tanks that exceed any of the above should not be interior lined unless approved by an authority having jurisdiction. To determine adherence to these guidelines, perforations and seams shall be ballpeen hammered (before and after sandblasting) to remove thin metal and obtain structurally sound edges. Perforations and seam splits shall be reamed out until the edges of the hole or split are a minimum of 1/8" thick. 7-4 Surface Preparation of Storage Tanks All holes should be plugged with plugs or screws of non -corrosive plastic (e.g. nylon or teflon), epoxy putty, or hydraulic cement. Seams may be plugged with hydraulic cement or lead wool. The use of plugs and hydraulic cement are used only as temporary measures to prevent water products, fumes, foreign matter from entering the tank during sandblasting. The entire tank shall be sandblasted completely free of rust, scale, and foreign matter to SSPC-SP5-63 "White Metal Blast". 01 13 a MOMM 11 Mel goo 112 smog 0 1 UINNE1111REHUy On "Rally I NFJ Page 7 5-83