SMARTFLEX double wall pipe and fitting system for the transport of fuels 3”, 4”, 5” was installed for a marina project in Ciudad del Carmen in the state of Campeche, Mexico. SMARTFLEX is a complete multilayer piping system for the transfer of automotive and aviation fuels, biofuels and hazardous fluids. The system has many international and local approvals and is already used and approved by major international petroleum companies, in response to whose needs it has been conceived, developed and successfully launched into the market. SMARTFLEX is recognized as a fully approved piping system for fuel containment and delivery for marina applications. All piping is of a nonmetalic construction and is not subject to salt-water corrosion. Moreover, the piping system, fittings and connectors are also proven to be resistant to corrosion and are electrostatically safe.