COMPLIANCE INFO_1987-1998 - Laserfiche WebLink

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TECHNICAL SPECIFICATIONS USING NSS 37E EPDXY/FRP TANK LININGS PAGE 4 C] 3. CLEANING AND SURFACE PREPARATION A. Employees entering the tank and those handling tank sludge, will be fully clothed so that arms, legs, head and torso are protected from contact with the tank residue and the coating resins, and shall wear oil and water,resistant boots and gloves. In addition, protective respiratory equipment providing positive air pressure, in a full facepiece mask, will be worn by those entering the tank before and during the sediment and water removal, sandblasting and removal of residue and during the lining application. Protective equipment shall be provided, used and maintained in a sanitary and reliable condition. Persons working in the tank when respirators are required, will be equipped with safety harnesses and safety lines. Standby employees shall be available and capable of lifting workers from the tank in an emergency. Communications shall be maintained on a constant basis between the workers and the stand-by employees. B. Inspection of the interior may be made with one of several forms of internal inspection lamps or flashlights approved for Class 1, Division 11 Group D Hazard locations. C. 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. D. The interior tank surfaces are to be sandblasted to a white metal finish. The shovels used to remove the residue shall be the same as in 3. C. above. All corrosion, scale, sand and dirt are to be removed and walls shall be vacuumed clean. Sandblasting and prime coating shall not take longer than 8 hours. E. Holes are to be located and plugged with boiler plugs, base resin, trowel material and reinforced with glass fibers. Seams are to be filled with trowel material to give a smooth surface for better application of the liner. 4. LINER APPLICATION A. The resin prime coat shall be applied immediately after the sandblasting is complete and must begin not later than 8 hours following the time the surface was blasted and before any sign of visible rust bloom. If visible rust is apparent, the surface shall be reblasted prior to priming. B. The laminate and seal coat shall be applied next according to the attached specifications. It shall be not less than 110 mils in thickness with no drips, runs, or sags.