Floating Roof Tank Vent Design

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

Floating roof tank vent design.

Floating roof storage tanks. Today controlled gas venting in to the atmosphere is becoming more and more important due to environmental regulations. 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. An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.

Floating roof tank allow the explosive gases in petroleum tanks to vent to atmosphere in a safe way. Closed floating roof tank this has an internal floating roof but eliminates natural ventilation of the tank vapor space. The vents in the floating roof protect the roof and rim seal and accommodate liquid movement and thermal breathing. For normal venting api 650 g 8 3 and h 6 2 specifies vents in the fixed roof tank shell and internal floating roof.

The roof rises and falls with the liquid level in the tank. 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. 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. For a tank with a fixed roof and internal floating roof but without a gas blanket.