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May 19 10 09:38a Reliable Petroleum ill Vmi 209;L45-8953 P.9 4P Vaporless Manufacturing, Inc. Quality Petroleum Equipment Solutions for Over 20 Years Adjustment of VM1 Leak Detector Certain Piping 00ad-Itions may affect the ability of any leak detector to rind a leak. They include high head pressures and high bleed -backs. High bleed -back may occur due to dips in the lines, stubbing for future dispensers, long pipe runs, and extremely flexible pipe. Bleed -back can be interpreted as energy coming back on the leak detector and trying to force the leak detector open. When a leak detector initially is installed and the fine pressure is zero psi, the leak detector is in the reset position. When the pump starts, the leak detector allows approximately 1-5 gallon per minute to pass through. In this position, the line is being filled with product and the pressure in the line is slowly rising. With the line filled with product, the pump still running, the line starts to expand as a balloon might. The expansion of the line is creating energy that is being forced back onto the leak detector piston. Naturally, steel pipe has less expansion than fiberglass pipe, and much less expansion than flexible pipe. Air pockets in the line also raise the bleed -back level, so every effort should be made to eliminate those air pockets by purging the line. If a VMI leak detector fails to find a 3 GPH leak, the leak detector is not staying at the leak sense position, but Instead is going through to full flow. If, when testing the leak detector, the pressure gauge shows a starting pressure of 0 psi and continues to pump operating pressure without hesitating at leak search pressure, the piston assembly may not have completely reset. If this occurs 2 times in a row; you should (1) turn the purnp off, (2) bleed the line pressure to 0 psi, (3) remove the vent line, (4) push the piston assembly down. Turn the pump on and re -test the leak detector to assure it finds a leak. Perform at least 2 additions! tests to ensure the leak detector is resetting on its own. If, when testing the leak detector, it hesitates at leak search pressure but does not hold in leak search position, an adjustment to the piston assembly may be made. The purpose is to make the leak detector more sensitive to a leak. To adjust the leak detector first remove the vent line and fitting from the top of the 99 LD -2000 or LD -2200 leak detector (99 LD -3000 remove the cap). You will now be looking at the top of the piston assembly. VaPorless Nlanufacturinz, Inc. 9700 last Long !Mesa Drive, Prescott Valley, Arizona 863t4 8001-367-0285 928-775 6191 Fax: 928-775-5309 Email: vfniCaMporlesscom WeWte: www.vagQrigg.corn