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