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v 5.0 Description of the 99 LD -2000 L, Vaporless 99 LD -2000 Addendum The 99 LD -2000 mechanical leak detector incorporates a poppet valve and metering pin. When the 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 developed by Vaporless in 1990. Features of the 99 LD -2000 include: • Drastically reduced piston size of the leak detector making for a much more responsive leak detector, significantly reducing the fuel needed to pass through the metering pin and poppet to allow full flow of the pump. • Eliminates traditional fuel flow path to the piston allowing the leak detector metering system better isolation from the turbulence and hydraulic effects found in the pump head during pump startup. This fuel flow change also eliminates the mechanical and thermal 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 of the 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 shock, enhancing. leak detection performance not only in steel and fiberglass lines but also in flexible piping systems. Higher leak sense pressure is possible due to the reduced piston area. The leak detector stays in the fast fill position to a higher pressure, compressing vapor pockets or removing stretch from flexible pipe faster. • 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 pump pressure reliefs, or defective bypass valves. If pump component failure occurs the integrated check valve does not allow V system to depressurize and reset the leak detector. Page 6