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Instructions for Testing Line Leak Detectors <br />Section G <br />1. Line leak detectors should be test -place,not removed. <br />2. The functional elements of the mechanical LLD are the piston and the diaphragm. To ensure that these elements <br />are functioning properly, the submersible pump can be started and the time that the piston or diaphragm takes to move <br />into position to enable full flow of the product noted. The range of allowable opening times is specified by the manufacturer <br />and is available in the equipment manual. <br />3. The presence of air pockets in the system will result in longer opening times since air is much more compressible than <br />product. <br />4. Thermal expansion and compression may be a problem in areas where there are large temperature variances between <br />day and night. The difference between product temperature and air temperature may be significant enough to create an <br />expansion or contraction as the product is pushed up the line into the LLD. <br />5. The purpose of the relief valve is to ensure that the LLD can function properly and is not damaged by an exessive build-up <br />of pressure behind the piston or diaphragm. If the pressure is exessive, the relief valve will vent into a copper tube that <br />leads back to the tank. The connections to this tubing should be checked for leaks. <br />05/00 <br />