Dual Containment Closed Top Tanks have dual wall to protect it from the dust & moisture of external environment. These tanks are mainly used for storing highly reactive chemicals and hazardous liquid, hence these tanks have water tight design and also it contains a primary and a secondary storage unit inside the tank. Each closed-top tank is available with a round containment basin that is specifically designed for the tank to contain an additional 15% more volume than the base storage tank. Several construction methods for dual containment tank construction have been developed to address the criteria for containment vessel surge volume and instrumentation requirements. These vessels are fitted with the required leak detection systems. These vessels are corrosion resistant inside and out, resisting chemical attack either from direct inside contact or from spills or fumes on the outside.