Circumferential Walkway

This could be a circumferential walkway approx. 1.2 meters below the top ring - it can usually be seen on an anaerobic digester mounted with double membrane gasholder. The circumferential walkway will not only provide much more convenient access for man, but also make installation of membrane roof easier and safer. This could be also a connection bridge among several tanks. From one of the tanks, people can reach other tanks via this connection walkway other than climbing down from one and climbing up to another.