In regards to penetrations through the bottom of a 8600 series Above ground / Marina containment sump, this should not be done on a floating dock or a dock that will be in motion for the purpose of environmental protection and fire safety. Permitting bottom penetrations would encourage the design of fuel systems that have additional and unnecessary fuel line connectors located directly below the sump unit. The 8600 series containment sumps are designed for side penetrations only.
Bravo all-fiberglass entry fittings which are rated and warranted for full fuel exposure or submersion for 30 years are not permitted to be installed to a steel containment sump wall such as that of the B-8600 series. Therefore, only flexible entry fittings can be used. Due to the low fuel resistance of flexible entry fittings (some far more than others) and despite any claims by the pipe manufacturer regarding fuel resistance ratings of the exterior of the pipe being specified, flexible entry fittings and flexible pipe of any brand should not be installed in a system that would cause these components to be needlessly and directly exposed to accumulated fuel or a fuel / water mixture. To accommodate this on any Under Dispenser Containment sump, flexible entry fittings should be installed only to a vertical wall and planned to be appropriately elevated from the bottom floor of that unit. The reasoning behind is two-fold: A) For fuel & fire containment reasons. And B) To discourage 90° degree connections or any other below the containment vessel. Piping systems exist today specifically designed for end-to-end applications such as at marinas that allow a fuel run to have no threaded connections, couplers or connectors between the two containment vessels on each end.
Though it may be obvious, entry of the fuel line should avoid penetration through the side of the UDC that is facing the operator of the dispenser. Acceptable entry points are the sides and rear of the B-8600 unit.
For stationary docks: B-8600′s can be ordered with a flush-mount flange at the upper edge to accommodate insetting into a dock for piping connections to be made below the dock surface. The flush mount variant allows the dispenser to be mounted directly to the dock. Deeper configurations can be ordered as necessary to better accommodate side penetrations for piping running underneath the dock structure.
As a rule, Bravo recommends that any and all connections should be eliminated from a piping system design installed over or near a waterway of any kind, save those at the endpoints that are secondarily contained within products designed and third party approved for fuel capture and long-term exposure.