This technique is already used for fuel piping and storage tanks. The area between the double-walled pipes is called an interstice, and that's how leaks are de

This technique is already used for fuel piping and storage tanks. The area between the double-walled pipes is called an interstice, and that's how leaks are detected. Additionally the interstice drains to a containment sump, so if any liquid is present, the leak is obvious, but there are sensors there too. Fuel is more corrosive than crude oil. However the sludge in crude can cause pitting corrosion over time. These systems are built such that corrosion and leaks are expected and inevitable. Gas stations and places like data centers, or anywhere with fuel storage or dispensers must be inspected monthly for this reason. Source: I work for an environmental compliance company, and built software to model and report on these types of fuel storage, transport, and dispensing systems.