Manufacture and installation process of backplane of pump tower for liquefied natural gas ship

Abstract

The invention relates to a method for manufacturing a bottom plate of a pump tower used for an LNG ship and a mounting method thereof. The method includes the following steps: fixing the main plate of the bottom plate - welding components and the planeness of the bottom plate - pre-mounting four goods pump supporting bodies and welding into a body - demarcating the processing excess of the goods pump supporting bodies and processing - mounting the goods pump supporting bodies to the main plate of the bottom plate - welding the component of a first layer and detecting the planeness of the mainplate of the bottom plate - welding a guide system - mounting the bottom plate to the main structure of a triangle mast - mounting the connection component of a main pump and the connection componentof an emergency pump - measuring the planeness and the size after welded. The method of the invention seems flexible and practical in the process of manufacturing the bottom plate of a pump tower, which needs no large scale equipment. Thus the method overcomes not only low utilization rate of purchased large scale equipment, but also the problem that the transport is difficult owing to over widthin the process for manufacturing the whole bottom plate.

Description

technical field [0001] The invention relates to the construction of a large-scale liquefied natural gas ship, in particular to a method for manufacturing a pump tower on a liquefied natural gas ship, and an assembly and welding method of key components constituting the pump tower. Background technique [0002] The pump tower of liquefied natural gas carrier (hereinafter referred to as LNG carrier) is a very important functional part in the cargo hold area of ​​LNG carrier. The manufacture of pump towers has become the core technology required for the construction of LNG ships. The bottom plate part of the pump tower is an important part in the pump tower structure. In the LNG ship structure, the liquid cargo pump is supported by the four cargo pump supports on the upper part of the bottom plate, and the six guide parts on the lower part are connected with the guide seat of the bilge. [0003] The bottom plate of the pump tower has a double-layer butterfly structure in the w...

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Problems solved by technology

Using the above process to manufacture the pump tower bottom plate structure mainly has the following shortcomings: First, because the external dimensions of the pump tower bottom plate are 4100mm×3200mm×1500mm, it is necessary to use a large portal machine tool to realize its pressure manufacturing, but In order to manufacture a small number of pump towers, the cost of purchasing such a large portal machine tool is huge; second, applying pressure after the entire pump tower bottom plate is welded may cause new welding defects and affect the pump tower bottom plate quality in use

Third, during the installation process of the pump tower bottom plate after manufacture, it can only ensure that the top and bottom of the pump tower meet the requirements of the drawings, and cannot guarantee that the middle part coincides with the center line of the pump tower, and there may be accuracy deviation problems during use

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