Heat insulation structure of flange joint for extremely low temperature gas

Abstract

The invention relates to a heat insulation structure of a flange joint for extremely low temperature gas, which is easy to maintain and repair. The heat insulation structure of the flange joint for the extremely low temperature gas according to the present invention may comprise: a storage container for storing the extremely low temperature gas therein; the flange is combined with the connecting part of the storage container; a first heat insulation assembly which covers and insulates the outside of the storage container except for the portion where the flange is disposed; and a second heat insulation assembly which covers and insulates the outside of the flange.

Description

technical field [0001] The present invention relates to a heat insulation structure of a flange joint for extremely low temperature gas which is easy to maintain and repair, and in more detail, relates to a heat insulation structure of a flange joint for extremely low temperature gas as follows: In the event of gas leakage to the outside of the flange, the leak can be detected and repaired by separating the heat insulation assembly without disassembling other structures. Background technique [0002] Typically, natural gas is transported in a gaseous state via onshore or offshore gas pipelines, or stored in LNG carriers in the liquefied state of liquefied natural gas (LNG) and transported to remote points of consumption. Liquefied natural gas is obtained by cooling natural gas to an extremely low temperature (approximately -163°C). Compared with gaseous natural gas, its volume is reduced to 1 / 600, so it is very suitable for long-distance transportation by sea. [0003] Sinc...

AI Technical Summary

Problems solved by technology

However, this structure is a structure in which the cover portion 50 completely covers the storage container 10, the piping 20, and the flange 30, and there is a problem that it is difficult to detect and repair when a leak occurs.

[0007] That is, when a leak occurs at the connection portion of the storage container 10 or the connection portion of the pipe 20, a portion of the heat insulating member 40 and the cover portion 50 at the position where the leakage is presumed to occur should be cut with a cutting machine, since it cannot be seen from the outside. The connection part between the storage container 10 and the piping 20, so it is often wrong to set the cutting part

Therefore, it is necessary to perform multiple cutting operations, which has the problem of increasing the man-hours of work.

[0008] Moreover, after the repair is completed, the heat insulating member 40 and the cover part 50 must be newly prepared and installed, which has the problem of increasing maintenance and repair costs.

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