Manhole device and vacuum heat insulation low-temperature storage tank with manhole device

Abstract

The invention discloses a manhole device and a vacuum heat insulation low-temperature storage tank with the manhole device. The vacuum heat insulation low-temperature storage tank comprises an outer shell and an inner container arranged in the outer shell, and a third interlayer with the vacuum environment is formed between the outer shell and the inner container. The manhole device comprises an outer hole assembly and an inner hole assembly. The outer hole assembly comprises an outer barrel and an outer cover. The outer barrel is provided with a first barrel port and a second barrel port, wherein the first barrel port is connected to the outer wall of the inner container, and the second barrel port stretches out of the outer shell. The outer cover is arranged on the second barrel port inan opening and closing manner. The inner hole assembly comprises an inner barrel and an inner cover. The inner barrel is sleeved with the outer barrel and provided with a third barrel port and a fourth barrel port, the third barrel port communicates with the inner container, and the fourth barrel port corresponds to the second barrel port. The inner cover is arranged on the fourth barrel port in an opening and closing manner. The outer diameter of the inner barrel is smaller than the inner diameter of the outer barrel, a first interlayer is formed between the outer hole assembly and the innerhole assembly, and the outer barrel is provided with a vacuum pumping port so that the first interlayer can be subjected to vacuum pumping.

Description

technical field [0001] The invention relates to the technical field of cryogenic pressure vessels, in particular to a manhole device and a vacuum insulated cryogenic storage tank having the manhole device. Background technique [0002] When liquefied natural gas (LNG) is used as fuel, it has the environmental protection characteristics of low sulfur content. In areas such as ships or offshore platforms, the use of liquefied natural gas as fuel has become increasingly common. Since the boiling point of liquefied natural gas at normal pressure is -162°C, how to store and transport it safely and reliably is an important link when using liquefied natural gas as a ship fuel. Generally speaking, liquefied natural gas is more suitable to be stored in vacuum insulated cryogenic storage tanks to obtain a longer maintenance time and minimize the loss of liquefied natural gas. [0003] According to the IGC rules, vacuum insulation cryogenic storage tanks belong to Type C independent ...

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Problems solved by technology

[0004] However, in the design of the existing vacuum insulated cryogenic storage tanks, due to the need to ensure the vacuum environment of the interlayer between the inner and outer tanks, there is no structure similar to a manhole, so a vacuum insulated storage tank without a manhole structure cannot Satisfy the inspection requirements for tank entry proposed by the IGC rules and the rules of various classification societies

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