Flexible double-containment piping system for underground storage tanks

A piping system for conveying fluid from the outlet port of a pump to the inlet port of an above-ground fluid dispenser, said piping system comprising:

• a. a pump coupling comprising an inner pump pipe in communication with the outlet port of the pump and an outer piping pump adapter concentric with the inner pipe,
• b. a dispenser coupling comprising an inner dispenser pipe in communication with the inlet port of the fluid dispenser and an outer piping dispenser adapter concentric with the inner dispenser pipe,
• c. a primary pipe of flexible material having an inlet end and an outlet end, said inlet end being removably secured to the inner pump pipe and said outlet end being removably secured to the inner dispenser pipe,
• d. a secondary pipe of flexible material generally surrounding the primary pipe, said secondary pipe having a pump end and a dispenser end,
• e. secondary connectors, said secondary connectors comprising a secondary pump connector and a secondary dispenser connector,
• f. said secondary pump connector removably securing the pump end of the secondary pipe to the outer piping pump adapter, said secondary pump connector having a first end in removable sealed communication with the outer piping pump adapter and a second end in communication with the pump end of the secondary pipe, said secondary pump connector being capable of retraction so as to facilitate access to the inner pump pipe and the inlet end of the primary pipe to allow disconnection of the primary pipe from the inner pump pipe when the first end of the secondary pump connector is disconnected from said outer piping pump adapter and the secondary pump connector is retracted,
• g. said secondary dispenser connector removably securing the dispenser end of the secondary pipe to the outer piping dispenser adapter, said secondary dispenser connector having a first dispenser end in removable sealed communications with the outer piping dispenser adapter and a second dispenser end in communication with the dispenser end of the secondary pipe, said secondary dispenser connector being capable of retraction so as to provide sufficient access to the inner dispenser pipe of the dispenser coupling and the outlet end of the primary pipe to allow disconnection of the primary pipe from the inner dispenser pipe when the first dispenser end is disconnected from said outer piping dispenser adapter and the secondary dispenser connector is retracted,
• h. a containment chamber which generally surrounds the pump, said containment chamber housing the secondary pump connector, and
• i. wherein the primary pipe, the secondary pipe, the pump coupling, the dispenser coupling, the secondary dispenser connector and the secondary pump connector define an annular volume that provides containment for the fluid in the event of leakage.