Double Deck External Floating Roof Tank

Floating roof tanks are commonly protected against lightning ignition by bonding the floating roof to the seal shoes at no less than 3m 10ft intervals use of insulating sections in the hanging linkages covering sharp points on hangers with insulating materials and installation of electrical bond straps across each pinned hanger joint. Single deck pontoon type figure 1 4 double deck figure 1 5 special buoy and radially reinforced roofs floating roof tank will be further discussed in details in later chapter. The two preferred configurations for external floating roofs are the double deck and the low single deck with 30 minimum pontoon area.

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The sketches shown illustrate the above single deck and double deck floating roof with the critical components for these structures.

Double deck external floating roof tank.

External floating roof tank double deck type an external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon. Double deck pontoon roofs which are designed with concentric annular pontoons with radial bulkheads in each pontoon section. External floating roofis where the roof floats on the product in an open tank and the roof is open to atmosphere.

The structural form of external floating roof is similar to internal floating roof both of them have a steel tray form floating cabin form single deck floating roof or double deck floating roof even external floating roof with aluminum alloy sandwich structure. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. The low single deck is the more efficient of the two for 30 to 170 foot diameter tanks. Types of external floating roof consist of.

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