ABSTRACT
Large inventory of hydrocarbon liquids is usually stored in atmospheric storage tanks. Sealing between the tank wall and the deck is achieved by providing rim seal-primary seal, made of flexible polyurethane or similar material, and an additional secondary seal between the pontoon portion of the deck and tank wall. The protective safety barriers are the Emergency Shutdown Valve (ESDV) provided at the inlet and outlet of liquid lines, which are activated when a set of process conditions reaches predefined values. Protective devices include ESDVs at inlet and outlet lines that will act automatically to close on fulfilling a set of process conditions including high-high and low-low levels in the tank. The pressure vacuum safety valve provided on roof is the safety barrier to prevent over-pressurization as well as vacuum inside the tank. Bayesian network has been developed separately for Floating roof and Cone roof tank, since there are certain differences in the design and operation of these tanks.
