Piping Notes For Self Contained Systems - Bennett 3700 Series Installation Manual

Piping Notes for Self-Contained Systems
To obtain maximum flow rates on a self-contained pump, follow these guidelines (see figure 14):
The total length of horizontal piping between the pump and tank must be no longer than 60 feet.
Use new 1-1/2" galvanized or approved non-metallic pipe for 10-15gpm pumps. Use new 2" galvanized
or approved non-metallic pipe for 20-24 gpm pumps.
All horizontal piping must be buried a MINIMUM of 18" below the finished grade to minimize temperature
effects.
The pipe from the tank must slope up to the pump (approximately 1-1/2" to 2" per 10 feet). The piping
run should not have any high or low spots (hills or valleys). The pipe must be supported continuously to
prevent sagging.
All piping must hold a 50 PSI pressure test for 10 minutes.
To absorb ground movement from settling of the tank, frost heaving of the ground or pump island
settling, a swing joint or flex pipe must be used in the supply line at the tank and directly underneath the
dispenser.
Only one pumping unit is permitted for each underground pipe. Two pumps on one suction line is not
recommended.
Static lift on self-contained units must not exceed 10 feet (vertical distance between product level in the
storage tank and the center of the pumping unit).
All Installation work must conform to federal, state, and local codes.
Above Ground Tanks - If using above ground tanks, make sure a vacuum actuated pressure regulating
valve is properly installed.
Follow Petroleum Equipment Institute's Recommended Practices for Installation of Underground Liquid
Storage Systems RP100 and/or Recommended Practices for Installation of Above Ground Storage
Systems for Motor Vehicle Fueling RP200. The installation must conform to EPA, NFPA, and State
regulations for storage tanks.
Copies of PEI's recommended practices can be order through their web site at: www.pei.org
NOTE: Please refer to PEI/RP100 Recommended Practices. The installation must conform to
EPA, NFPA, and State regulations for underground storage tanks.
120001 Rev K 1-19-18
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