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ENGINEERING REPORT LEAK DETECTOR TROUBLESHOOTING AND TESTING GUIDE RED JACKET"' 0 PUMPS August, 1992 5 The following defined terms are used throughout this literature to bring attention to the presence of hazards of various risk levels,or to important information concerning the life of the product. ® indicates presence of a hazard which wiU cause seven personal injury, ® indicates presence oCe hazard which will orcan cause minor personal death or substantial property damage if ignored. injury,death or substantial property damage if ignored. indicates presence of a hazard which can causemuere personal injury,® indicates special instructions on installations,operation,or mainte- death or substantial property damage if ignored. ® nance which are important but not related to personal injury hazards. THE ABC'S OF TROUBLESHOOTING should be in the down or tripped position. When the pump is activated, approximately one ounce of product THE MECHANICAL LEAK DETECTOR should be expelled initially as the piston travels to the up Our experience teaches us that troubleshooting position. If product continues to flow more than a dropper mechanical leak detector problems goes much better if second from the tube fitting after 1 minute,with the pump approached properly. With that in mind, we have de- running, the pressure relief valve in the piston may be signed this bulletin as an easy to follow,three step guide. leaking, or the teflon on the perimeter of the piston may To take the most effective approach,we suggest that you be leaking due to damage or foreign matter. Reconnect ask and find the answers to three questions. In order, tubing before returning system into service. they are: PISTON SEAL A) Is the leak detector performing a line test and why? j B) How long is the leak detector taking to perform a , FLUID DISCHARGED leak check? RELIEF VALVE / FROM VENT TUBE THE C) Is the time allowed, before dispensing occurs, (OPENINGOZZLE (ie. the nozzle opening) sufficient to allow the leak detector to perform a test? Use this ABC logic and the following guide in answering the questions in each section to help solve leak detector and pipng system problems encountered. AWHY IS THE LEAK DETECTOR PERFORM- ING A LINE TEST? in our literature engineering As stated and service manuals,the mechanical leak detectors perform FIGURE 1 line tests the next time the pump is activated after line 2) Are seals located upstream of the leak detector pressure has fallen to less than 1 PSI. The questions in or in the pump housing leaking? this section will aid in determining the nature of the loss The piston ordiaphragm leak detector basically does of system pressure and the resulting leak test. not test the upstream submersible pump components 1) Is the leak detector leaking internally? such as the check valve and the pressure relief valve. Internal leakage inside the piston leak detector will However, by understanding the way the leak detector cause the system pressure to drop and cause the leak functions,it is possible to determine if these components detector to go into the trip position. Fluid that is leaking are operating properly. For example, if the check valve, internally will gather on top of the piston as it descends pressure relief valve, or other seals located upstream of into the trip position. By observing the amount off luid that or before,the leak detector would leak and allow the line is expelled from the vent tube as the leak detector is pressure to drop to zero each time the submersible pump opening and when it is in the open position with the pump was turned off(Figure 2),the leak detector would react to running, it is possible to determine if internal leakage is the drop in line pressure and move to the reset or tripped occurring. (Figure 1) position. The time it takes to go from full line pressure to With the pump turned off, disconnect tubing and zero is based on how great the leak is. The Piston LLD place a container under the elbow tube fitting leading acts slightly different in that the line pressure would first from the top of the leak detector. The leak detector drop to the 5-6 PSI range as the piston delivers its volume RJ-34 8/92