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n Vaporless 99 LD -2000 Addendum 5.0 Description of the 99 LD -2000 thThe 99 LD -2000 mechanical leak detector incorporates a poppet valve and metering pin. When e pump is activated, fuel is metered into the line to raise the pressure. If the pressure rises above 24 psi, the poppet valve opens and full flow into the line occurs: If the pressure fails to rise above 24 psi, fuel flow in the line is restricted to approximately 2 gal/min. The 99 LD -2000 mechanical line leak detector is based on the original LD -2000 d Vaporless in 1990. Features of the 99 LD -2000 include: eveloped by Drastically reduced piston size of the leak detector making for a much more responsive leak detector, significantly reducing the fuel needed to p g.piass through the meterin and poppetto allow full flow of the pump. n and • Eliminates traditional fuel flow path to the piston allowing the leak detector met system better isolation from the turbulence and hydraulic effects found in the enng dig pip startup. This fuel flow change also eliminates the mechanical and therm head effects present in the upper half of the pump, allowing the leak detector. to only respond to line pressure changes. • More responsive leak detectors allowing the line to open up for pumping more quickly, When the pump is off, it will reset to leak sense position faster because ofthe smaller amount of fuel under the -piston.- Additionally, the leak -detector does not have to completely reset to cycle through the leak sense position. If the line pressure falls as low as 5 psi (when the pump is off, the leak detector is forced into the leak sense mode. • Reduced surface area of the piston results in less exposure to hydraulic line sh enhancing leak detection performance not onl on i flexible piping systems. yin steel and fiberglass lines but also n • Higher leak sense pressure is possible due to the reduced piston area. The leak Bete stays in the fast fill position to a higher pressure, compressing vapor pockets or removing ctor stretch from flexible pipe faster. g • Field adjustment access in cap to adjust sensitivity for wear or field variables such as deep burial or excessive trapped vapor. Integrated check valve to compensate for pump component failure such as leaking check valves in the turbine, defective submersible um valves. If. Pump pressure reliefs, or defective bypas PUMP component failure occurs the integrated check valve does not allow t' system to depressurize and reset the leak detector. Page 6