Method for constructing gas dome barrel of LNG ship in outer field

Abstract

The invention discloses a method for constructing a gas dome barrel of an LNG ship in an outer field. The method comprises the steps that a carrying lifting ring is installed on a dome deck; the domedeck is inversely placed on a jig frame by utilizing the carrying lifting ring, and an inner deck is normally placed on the jig frame; a framework installation line and a barrel inspection line are drawn on the dome deck according to a construction drawing; a framework and the barrel are welded and fixed to the dome deck according to the framework installation line and the barrel inspection line;after the framework, the barrel and the dome deck are fixed into a whole, the whole is turned over to be aligned and folded with the inner deck; and the barrel and the inner deck are welded and fixed.According to the method for constructing the gas dome barrel of the LNG ship in outer field, the gas dome barrel is independently manufactured in the outer field, so that the problem that the storageperiod of the gas dome barrel lags behind due to the fact that a traditional gas dome barrel is folded in the inner field and sections is effectively solved, and the constructing time of the gas domebarrel is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of ship building, in particular to a method for constructing an external field of an LNG ship air dome. Background technique [0002] LNG ships are used to transport liquefied natural gas. Because the cargo tank needs to be exchanged with air, inert gas, natural gas and other gases, the gas specific gravity is different, so the gas injection and discharge positions are also different. The gas dome is a stainless steel structure designed for the gas injection and discharge of the cargo tank of an LNG carrier. [0003] Usually, the air dome cylinder is a component of the dome deck segment. It is manufactured in the infield workshop of the segment stage, and is assembled into a whole through precision control and segmentation, and then transported to the outfield site of the final assembly stage for hoisting on board. However, the infield manufacturing is limited by the conditions of the factory building infra...

AI Technical Summary

Problems solved by technology

However, the infield manufacturing is limited by the conditions of the plant infrastructure, and sometimes cannot fully meet the ever-changing market demand for ships. The completion time of the air dome often lags behind the demand and delivery schedule.

As a precise installation component, the air dome cylinder has a cumbersome precision control process, high requirements for inspection, and a small compressible space in the production cycle itself, so it will have a great impact on the completion nodes of the entire dome deck segment, which in turn will affect the final assembly. Completion cycle of stage holds, which ultimately affects dock cycle

[0004] To sum up, there is currently a lack of a method that can solve the nano-period lag of the air dome cylinder by making the air dome cylinder separately in the outside field instead of closing it in the infield and in sections

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