External Floating Roof Tank Construction

As there is almost no gas space between floating roof deck and oil level the evaporation loss of stored oil can be greatly reduced.

External floating roof tank construction.

The external floating roof tank has a floating roof deck which is covered on the surface of oil and floats up and down with the oil level. 19 ladder and well is a ladder that passes through a well and is used to access the tank bottom of an internal floating roof tank. Floating roof tanks are usually built in a gigantic size and this would involve various disciplines such as civil chemical mechanical fire safety construction inspection commissioning and operation. The roof rises and falls with the liquid level in the tank.

The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks. 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. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. The floating roof is made up of various elements such as fittings decks and rim sealing systems.

The floating roof decks are usually made of welded steel plates and can be of three types double deck pontoon and pan. 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. External floating roof tank is known as external floating roof oil tank it is an open top floating roof tank without vault there is usually an external floating roof in it which can vertical float up and down. 18 internal floating roof tank is a storage tank equipped with a fixed roof and a floating roof which rests on the liquid being contained.