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Instructions for Testing Line Leak Detectors <br /> Section G <br /> 1. Line leak detectors should be tested in-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 />