Impact test exemption curve 23.
Double deck external floating roof tank.
Types of floating roofs in storage tanks.
These are categorized as external floating roofs which are designed to meet requirements of api standards 650 appendix c.
In the same sealing condition compared with external floating roof tank internal floating roof tank can further reduce the volatilization loss as a result of that compared with double deck floating roof on external floating roof tank shaded by fixed roof and the gas phase layer between fixed roof and internal floating plate have a more.
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.
Single deck floating roof tank 12 figure 1 7.
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.
Sketches are provided in the article depicting the pan type pontoon and double deck arrangement for external floating roof tanks.
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.
Double deck type floating roof 10 figure 1 6.
Larry post a reply.
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.
Storage tank capacities and levels 15 figure 1 9.
The principal types of floating roof designs which are installed in tanks which store crude and middle distillate products are summarized below.
The tank is in crude oil service and is 5000 m3 capacity.
I appreciate your advice on the rate of fill.
I reviewed api 650 and 2003 and didn t find much specific information pertaining to fill rates.
Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon.
The tank is external double deck floating roof.
