Active protection structure for primary sealing space of external floating roof type oil storage tank

Abstract

The invention discloses an active protection structure for a primary sealing space of an external floating roof type oil storage tank. The external floating roof type oil storage tank comprises a tank wall and an external floating roof arranged in the oil storage tank, wherein primary and secondary sealing spaces are formed between the tank wall and the external floating roof through a primary sealing oil gas diaphragm and a secondary sealing oil gas diaphragm, a secondary sealing baffle is arranged on the outer side of the secondary sealing oil gas diaphragm, the primary sealing oil gas diaphragm, the secondary sealing oil gas diaphragm and the secondary sealing baffle are fixedly connected with the external floating roof through connecting bolts, one end of the connecting bolt is arranged in the primary sealing space, each connecting bolt is of a hollow structure, and the primary sealing space is communicated with an inert gas generating device or / and an oil gas sampling device through connecting bolts having the hollow structures. The active protection structure disclosed by the invention can be used for conveying an inert protective medium and an oil gas sample into the primary sealing space on the condition of not changing the original structure of the oil storage tank and performing no additional machining.

Description

technical field [0001] The invention belongs to the technical field of fire safety, and in particular relates to an active protection structure for the primary sealing space of an external floating roof oil storage tank. Background technique [0002] At present, large oil storage tanks with external floating roofs that adopt mechanical seals in China have a certain concentration of oil vapor and oxygen in the sealing parts of the floating roofs. During the thunderstorm season, lightning strikes in this part can easily cause explosion and combustion, resulting in major safety accidents. If the inert protection medium (such as N 2 ) into the primary and secondary sealed spaces to reduce the concentration of oxygen and oil gas to a safe range, so that the lightning protection of the storage tank can be realized. However, the existing petroleum storage tanks in use are not allowed to carry out mechanical processing operations such as drilling and cutting on the tank body and fl...

AI Technical Summary

Problems solved by technology

However, the existing petroleum storage tanks in use are not allowed to carry out mechanical processing operations such as drilling and cutting on the tank body and floating roof due to their high requirements for safety. Therefore, in the existing external floating roof petroleum storage tanks Based on the structure, the active protection method for large oil storage tanks with external floating roofs can only actively protect the sealed space between the primary and secondary seals, but cannot actively protect the primary sealed space

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