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® r <br /> As you prepare the site,you need to consider: <br /> • Manholes <br /> • Stage II Vapor Recovery system <br /> • Piping runs <br /> • Manifolded product lines <br /> Manholes <br /> When using a SwiftCheck Valve,the manhole must provide at least S inches of clearance above the pump head to install <br /> the PLLD components. <br /> Stage 11 Vapor Recovery <br /> If there is a Stage II Vapor Recovery system installed that includes a device in the pressurized piping,such as a Healy <br /> Mini-Jeff, see"PLLD Installation with Stage II Vapor Recovery Systems"on page 4-12 for installation guidelines. <br /> Piping Runs <br /> Where piping runs have been installed for future use,but are connected to the active piping system,isolate the inactive <br /> lines from the active lines using a shutoff valve. Failure to do so may harm system performance. <br /> Existing Check Valves <br /> You must ensure that there are no existing check valves already installed in the pipeline.The presence of any check valve <br /> (other than the one used with the PLLD system)can prevent the PLLD system from detecting line leaks in the area of <br /> pipeline downstream from the check valve. <br /> Manifolded Product Lines <br /> If the PLLD system will be used on manifolded product lines,see"Manifolded Product Line PLLD Installation'on <br /> page 4-9 for installation instructions. <br /> Submersible Pumps <br /> The PLLD system is not qualified for use with Red Jacket X5 model submersible pumps or FE Petro 550-3-S and 550-5- <br /> S model pumps. <br /> Pump output pressure must be 23 psi minimum. <br /> 2-1 <br />