External Floating Roof Tank Pontoon

External floating roof and internal floating roof.

External floating roof tank pontoon.

Types of fixed roof tanks 8 figure 1 4. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. Floating roof is the core component of floating roof storage tank which is divided into two types. Storage tank capacities and levels 15.

Single deck floating roof tank 12 figure 1 7. Tanks with external floating roofs are used primarily to contain liquids with high vapor pressures when the vapor emissions from fixed roof tanks would exceed the standards set by the local jurisdiction. Main two types of floating roof tanks single deck floating roof in single deck roof which is also called pontoon roof the buoyancy is derived by the pontoons according to api 650 3. The roof rises and falls with the liquid level in the tank.

Pontoon type floating roofs are the most economical type of floating roofs in the market. Because the flexible floating roof deck can float up and down to close to the liquid level gas space above the liquid level can be greatly reduced thereby greatly reducing the evaporation. These are categorized as external floating roofs which are designed to meet requirements of api standards 650 appendix c. Types of floating roofs in storage tanks.

Double deck type floating roof 10 figure 1 6. Double deck floating roof tank 13 figure 1 8. Ergil storagetech internal floating roofs which minimize the evaporation losses of stored products such as jet fuels gasoline diesel and crude oil can be supplied as aluminium or stainless steel. An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.

The deck of single deck floating roofs shall be designed to be in contact with the storage liquid during normal operation regardless of the service. The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks.