Floating Roof Tank Vent Design

Floating roofs have been designed and used for more than a century.

Floating roof tank vent design.

Today controlled gas venting in to the atmosphere is becoming more and more important due to environmental regulations. 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. Vii 2 18 1 roof seal system 37 2 18 2 support leg 38 2 18 3 roof drain system 39 2 18 4 vent bleeder vents 43 2 18 5 centering and anti rotation device 44. Floating roof storage tanks.

The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. For a tank with a fixed roof and internal floating roof but without a gas blanket. Floating roof tank allow the explosive gases in petroleum tanks to vent to atmosphere in a safe way.

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 roof rises and falls with the liquid level in the tank. 2 16 failure mode due to seismic effects on floating roof tank 34 2 17 fitting design and requirement 36 2 18 typical fitting and accessories for floating roof 37. The vents in the floating roof protect the roof and rim seal and accommodate liquid movement and thermal breathing.