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Airtightness detection method of CM node area of liquid cargo tank of LNG ship

A technology of LNG ship and detection method is applied in the field of tightness detection of CM node area of ​​cargo tank of LNG ship, which can solve the problems of unobservable welding seam in the area, late formation of ballast tank structure, and unfavorable development of containment system, etc. The effect of shortening the shipbuilding period, increasing the convenience of construction and opening up the space

Inactive Publication Date: 2018-05-11
SHANGHAI JIANGNAN CHANGXING SHIPBUILDING
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Problems solved by technology

There are two problems with this method: first, the structure of the ballast tanks in the CM node area is formed late, and the waiting period for the cabin inflation test conditions in the dock stage is long, which is not conducive to the development of the follow-up containment system work
Second, after the insulation box inside the cargo tank is installed, it will cover the welds in the CM node area, so that the welds in this area cannot be observed when the cabin inflation test is carried out later.

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  • Airtightness detection method of CM node area of liquid cargo tank of LNG ship
  • Airtightness detection method of CM node area of liquid cargo tank of LNG ship
  • Airtightness detection method of CM node area of liquid cargo tank of LNG ship

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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention is described below through specific embodiments shown in the accompanying drawings. It should be understood, however, that these descriptions are exemplary only and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0049] combine figure 1 Describe this embodiment, the tightness detection method of the CM node area of ​​the LNG ship cargo tank of the present invention, this method is carried out under the situation that the ballast tank and the cargo tank do not form a complete cabin, buys time for the construction of the cargo tank containment system, Shorten the construction cycle of LNG ships. The CM node is the connection point of the "octahedron" structure of the l...

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Abstract

The invention discloses an airtightness detection method of a CM node area of a liquid cargo tank of an LNG ship. The method comprises: a structural characteristic of a target CM node of a liquid cargo tank of an LNG ship is analyzed; on the basis of the structural characteristic of the target CM node, a CM node type is determined and a matched vacuum cover is selected based on the CM node type; and detection liquid is sprayed on a detected weld joint, the selected vacuum cover is in close contact with a corresponding ballast tank wall, and then vacuumization detection is started. According tothe invention, while related ship structures of the ballast tank do not form a complete tank, airtightness detection is carried out on the CM node area quickly and conveniently, so that time is earned for follow-up construction of the LNG ship containment system and the construction period of the LNG ship is shortened. Moreover, the CM node can be detected at the forming process of any construction stage like the segmentation stage and the main stage and restrictions on the construction state, the segmentation placing state, and the welding mode are eliminated.

Description

technical field [0001] The invention relates to the technical field of shipbuilding, in particular to a method for detecting the tightness of a CM node area of ​​a liquid cargo tank of an LNG ship. Background technique [0002] A liquefied natural gas carrier (LNG carrier) is a world-recognized "three-high" ship with high technology, high added value, and high reliability requirements. Its service life is as long as more than 40 years. During this period, it is necessary to ensure the ability to transport LNG at -163°C. Therefore, quite high requirements are put forward for the fatigue strength of the hull structure. [0003] The CM joints summarized in the LNG ship construction process are the connection points of the "octahedron" structure of the liquid cargo tank. The welds in the CM joint area include four types. The fillet weld, the fillet weld between the vertical downward sloping bulkhead of the ballast tank and the horizontal girder; the second type is composed of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/12G01M3/34
CPCG01M3/146G01M3/34
Inventor 万莉刘雪峰
Owner SHANGHAI JIANGNAN CHANGXING SHIPBUILDING
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