Floating Roof Double Deck Pontoon

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.

Floating roof double deck pontoon.

The roof is consisted of a portion divided by the ring and radial bulkheads into several compartments and a portion called the flexible bay. A double deck type floating roof has two complete decks covering the entire liquid surface. Over the years jm dixon associates has undertaken the design of many floating roofs both double and single deck for world renowned clients such as philips 66 exxon mobil and ineos. Sketches are provided in the article depicting the pan type pontoon and double deck arrangement for external floating roof tanks.

The sketches shown illustrate the above single deck and double deck floating roof with the critical components for these structures. In my humble opinion the double deck arrangement would be a more robust design but may cost extra and a detailed techno economic evaluation would be needed to arrive at the optimum option. Pontoon type floating roofs are the most economical type of floating roofs in the market. Figure 1 4 single deck pontoon type floating roof bob.

The low single deck is the more efficient of the two for 30 to 170 foot diameter tanks. The two preferred configurations for external floating roofs are the double deck and the low single deck with 30 minimum pontoon area. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. Double deck pontoon roofs which are designed with concentric annular pontoons with radial bulkheads in each pontoon section.

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.