Combined type sealing mechanism for external floating roof oil tank

Abstract

The invention discloses a combined type sealing mechanism for an external floating roof oil tank, belongs to the technical field of external floating roof tank sealing devices for crude oil storage, and particularly relates to a combined type sealing mechanism. The combined type sealing mechanism for the external floating roof oil tank is large in deformation compensation amount, good in oil resistivity, high in abrasive resistance and good in sealing performance. The combined type sealing mechanism comprises a floating roof and sealing assemblies and is characterized in that an annular sealing body formed by the sealing assemblies is arranged around the floating roof, a spring compensation mechanism connected with each sealing assembly is arranged on the floating roof, and mackintosh is arranged between the floating roof and the sealing assemblies.

Description

technical field [0001] The invention belongs to the technical field of sealing devices for external floating roof tanks used for crude oil storage, and in particular relates to a combined sealing mechanism. Background technique [0002] Storage tanks are usually used to store volatile petroleum products such as crude oil, gasoline or kerosene. According to different structural forms of oil tanks, they can be divided into: fixed roof storage tanks, moment-free roof storage tanks, floating roof storage tanks and sleeve roofs Storage tanks, etc. [0003] The floating roof of the external floating roof storage tank is a floating roof floating on the surface of the liquid storage. It floats up and down with the input and output of the storage liquid. There is an annular space between the floating roof and the tank wall. This annular space has a seal The device isolates the liquid in the tank from the atmosphere when the top cover floats up and down, thereby greatly reducing the ...

AI Technical Summary

Problems solved by technology

However, since the effect of the secondary seal is better than that of the primary seal, a huge oil and gas storage space 23 will be formed between the primary and secondary seals. If there is a thunderstorm, the oil and gas will easily ignite or even explode.

[0012] The main reasons for the failure of the existing seal are the influence of the settlement of the oil tank foundation, the tolerance during the construction process, and the guide deviation of the pontoon during the lifting process, so that the distance between the pontoon and the tank wall is too large on one side and too large on the other side. Small phenomenon, overheating of the floating roof heating coil during operation, causing the seal to age too quickly and lose elasticity, etc.

[0013] The original bladder seal structure, due to its poor resistance to crude oil corrosion and air aging, generally has a service life of only 3 to 6 years, which does not match the 10-year overhaul of the entire tank, and requires additional tank cleaning and replacement

For a 100,000 m 3 For the oil storage tanks, the cost of cleaning the tank alone needs about 1 million yuan, plus the replacement cost of the sealing structure, the cost is very huge

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