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Designated backfill material ie.sand,crushed rock or pea gravel Care should be taken to check gauges for proper operation and <br /> should be used to form a temporary bedding. This uniform accuracy. Always confirm the proper gauge for the proper job, <br /> bedding must be free of foreign matter, evenly graded and cut vacuum gauges used on pressure tests have caused serious <br /> out so that tank will not roll while in the storage area. accidents. <br /> If strong winds are expected, secure tank to prevent damage. <br /> After storage period and prior to installation,visually reinspect Pre Installation Testing <br /> tank for damage that could result in leakage or premature (Single Wall Tanks) <br /> corrosion. Single wall tanks must be tested for leaks by using a soap <br /> solution or other approved methodology accepted by the <br /> "authority having jurisdiction". <br /> Remove thread protectors and shipping plugs from all openings. <br /> • 0 v, 0 d Using compatible, non-hardening pipe sealant, install <br /> 0 ® permanent plugs or piping in all openings. <br /> Pressurize tank to at least 3 psig but no more than 5 psig. <br /> If no leaks are detected, release air pressure. <br /> Refer to Modern Welding Company's publication, "Finishing <br /> Instructions" for proper installation of permanent coverings for <br /> unused openings, lifting lugs, piping, fittings and any exposed <br /> steel surfaces. Finishing Instructions are not complete until <br /> all exposed steel surfaces on tank are sealed with fiberglass <br /> PRE INSTALLATION TESTING (ALL TANKS) resin. <br /> NFPA-30 requires that all underground storage tanks be ,-•. <br /> tightness tested prior to covering. <br /> Proper gauge selection is important. A gauge with maximum <br /> readable range of 10 to 15 psi is recommended due to the <br /> sensitivity required for gauges to detect slight changes in air <br /> pressure. It is recommended that two gauges be used to reduce <br /> the chance of an undetected gauge failure. In addition, it is <br /> recommended to use a pressure relief valve to prevent over <br /> pressurization of the tank or annular space. This relief valve <br /> should be of sufficient capacity to relieve total output of air 'd <br /> source at a pressure setting of not more than 6 psig. <br /> 8 <br /> Quick <br /> coupler <br /> to air Valve <br /> SO1fCe Pre Installation Testing <br /> (Double Wall Tanks Type I and Type II) <br /> AIR PRESSURE METHOD <br /> : Double wall tanks, Type I and Type Il constructions must be <br /> tested for leaks by using a soap solution or other approved <br /> methodology accepted by the"authority having jurisdiction". <br /> gauge Back-up Gauge Remove thread protectors and shipping plugs from all openings. <br /> — s psig Using compatible, non-hardening pipe sealant, install <br /> preswre — permanent plugs or piping in all openings. <br /> relief <br /> device Pressurize primary tank to at least 3 psig but no more than 5 <br /> psig. Close off valve to primary tank and disconnect air <br /> source. Monitor the gauge reading for one hour. If there is no <br /> evidence of a leak, indicated by a drop in air pressure, then <br /> bleed air over from the primary tank into the interstice. <br /> The interstice shall have a separate gauge to indicate pressure <br />