A double wall coaxial piping system with enhanced strength designed to transport a medium underground and minimize leaks is provided. The double wall coaxial piping system includes a plurality of pipe assemblies connected together to form a constructed pipe assembly with a first end and a second end. Each pipe assembly has an outer pipe and an inner pipe secured within the outer pipe. The inner pipe of each pipe assembly is continuously connected to the inner pipe of an adjacent pipe assembly in the plurality of pipe assemblies. Each end in the first and second ends of the constructed pipe assembly has a pair of plates coupled to the outer pipe of the pipe assembly at the end of the constructed pipe assembly and a packing layer disposed between the pair of plates.