6
Site Considerations
Manholes
When using a SwiftCheck Valve, the manhole must provide at least 8 inches of clearance above the pump head to
install the DPLLD components.
Unused Piping Runs
Where piping runs have been installed for future use, but are connected to the active piping system, isolate the
inactive lines from the active lines using a shutoff valve. Failure to do so may harm system performance.
Existing Check Valves
You must ensure that there are no existing check valves already installed in the pipeline. The presence of any check
valve (other than the one used with the DPLLD equipment) can prevent the DPLLD equipment from detecting line
leaks in the area of pipeline downstream from the check valve.
Manifolded Product Lines
Follow these guidelines as you install a DPLLD equipment into multiple manifolded tanks:
• Dielectric unions and flexible piping elements should be used as required by federal, state, and local
requirements for the specific piping application. Location of unions may vary with configuration.
• An I/O Module in the console is required to control the pump on the higher-numbered tank and pump control
output for the primary tank, and the “Pump In” (Dispenser ON) signal for the set.
• A DPLLD transducer is only required in the primary pump.
• Remove any other check valve or leak detect device in the line that is not shown.
• Refer to the Line Leak Application Guide for check valve requirements.
