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Sep 22 08 10:40a Reliable Petroleum 209-845-8953 p,11 <br /> VM1 <br /> Vaporless Manufacturing, Inc. <br /> Quality Petroleum Equipment <br /> Solutions for Over 20 Years <br /> March 28th, 2005 <br /> Adjustment of VMl teak Detector <br /> Certain piping conditions may affect the ability of any leak detector to find a leak. They include <br /> high head pressures and high bleed-backs, High bleed-back may occur due to dips in the lines, <br /> stubbing forfuture dispensers, long pipe runs, and extremely flexible pipe. <br /> Bleed-back can be interpreted as energy corning back on the leak detector and trying to force <br /> the leak detector open. When a leak detector initially is installed and the line pressure is zero <br /> psi, the leak detector is in the reset position. When the pump starts, the leak detector allows <br /> approximately 1.5 gallon per minute to pass through. In this position, the line is being filled with <br /> product and the pressure in the line is slowly rising. <br /> With the line filled with product, the pump still running, the line starts to expand as a balloon <br /> might. The expansion of the line is creating energy that is being forced back onto the leak <br /> detector piston. <br /> Naturally, steel pipe has less expansion than fiberglass pipe, and much less expansion than <br /> flexible pipe. <br /> Air pockets in the line also raise the bleed-back level, so every effort should be made to <br /> eliminate those air pockets by purging the line. <br /> If a VMI leak detector fails to find a 3 GPH leak, the leak detector is not staying at the leak <br /> sense position, but instead is going through to full flaw. <br /> If, when testing the leak detector, the pressure gauge shows a starting pressure of 0 psi and <br /> continues to pump operating pressure without hesitating at leak search pressure, the piston <br /> assembly may not have completely reset. If this occurs 2 times in a row; you should (1)turn the <br /> pump off, (2) bleed the line pressure to 0 psi, (3) remove the vent line, (4) push the piston <br /> assembly down. Turn the pump on and re-test the leak detector to assure it finds a leak. <br /> Perform at least 2 additional tests to ensure the leak detector is resetting on its own. <br /> If, when testing the leak detector, it hesitates at leak search pressure but does not hold in leak <br /> search position, an adjustment to the piston assembly may be made. The purpose is to make <br /> the leak detector more sensitive to a leak, <br /> To adjust the leak detector first remove the vent line and fitting from the top of the 99 LD-2000 <br /> or LD-2200 leak detector (99 LD-3000 remove the cap). You will now be looking at the top of <br /> the piston assembly. <br /> Vaporless Manufacturing,Inc. <br /> 8700 East Long Mesa Drive,Prescott valley,Arizona 86314 <br /> 800-367-0185 938-775-5191 Fax-. 928-775-5309 <br /> Email: vmi@vaporiess.com vaporiess.com V4'ebsite: www.val3ortess.com <br />