Double-walled definition
Double-walled means a storage tank that has an outer tank wall, or integral piping that has an outer wall that provides secondary containment of the primary tank or piping.
Double-walled means factory certified construction utilizing an inner wall and an outer wall with an interstitial space between the inner wall and outer wall suitable for interstitial moni- toring.
Double-walled means a storage tank system or system component that has an outer wall that provides secondary containment.