CN113715987B - LNG (liquefied Natural gas) bilge control method - Google Patents
LNG (liquefied Natural gas) bilge control method Download PDFInfo
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- CN113715987B CN113715987B CN202111024792.2A CN202111024792A CN113715987B CN 113715987 B CN113715987 B CN 113715987B CN 202111024792 A CN202111024792 A CN 202111024792A CN 113715987 B CN113715987 B CN 113715987B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000003949 liquefied natural gas Substances 0.000 title description 23
- 230000011218 segmentation Effects 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/10—Building or assembling vessels from prefabricated hull blocks, i.e. complete hull cross-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an LNG hold control method, which comprises the following steps: decomposing the LNG cargo hold into a plurality of segments according to the segment division diagram; calculating theoretical bilge of each segment according to the section size of each segment, and recording all theoretical bilge data in an excel table; building each segment; carrying out segmentation of the double-layer bottom part, measuring the actual bilge of the segmentation of the double-layer bottom part after carrying out segmentation, and recording the bilge change value of the segmentation of the double-layer bottom part in an excel table; and adjusting the loading of the side part segments according to the bilge variation value of the double-layer bottom part segments. According to the invention, the deviation values of all the carried segments are input into the excel table, so that the influence condition of the positioning deviation of the carried segments on the whole cabin capacity can be automatically calculated, and the carrying condition of the subsequent segments can be adjusted in a targeted manner, so that the cabin capacity of the LNG cargo hold can be accurately controlled.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to an LNG hold control method.
Background
The basic shape of the inner shell of an LNG cargo tank of an LNG ship built at present is a decahedron shape no matter the model No.96 or the model MarkIII, and because the LNG cargo tank is large in size and complex in shape, the LNG cargo tank is usually composed of more than ten segments, and in the carrying process of the segments, positive and negative deviations always occur. However, how much the bias affects the overall bilge should be adjusted when the subsequent segments are carried, and since no existing formula or related software assistance is available, a rough judgment is generally made according to the positive and negative bias conditions, so that the influence of the bias on the overall bilge is unknown. For example, the positioning and carrying of the double-layer bottom section are bigger, so that the tolerance of the height is generally negative; however, if some double-layer bottom segments have positive tolerances and some negative tolerances, accurate judgment cannot be made in the face of such a complicated situation, and the mounting and positioning can be performed only according to the designed theoretical value.
How to learn the influence of the positioning dimensions on the whole hold after each relevant section is carried and positioned in time, and can provide beneficial guidance for carrying and positioning of the subsequent sections, avoid larger fluctuation of the hold and be more close to the theoretical value required by design, and the problems always plague staff engaged in carrying and positioning the LNG cargo hold.
Disclosure of Invention
In view of the above, the present invention provides an LNG hold control method for solving the above-mentioned problems in the prior art.
The LNG hold control method specifically comprises the following steps:
s1, decomposing an LNG cargo hold into a plurality of segments according to a segment division diagram;
s2, calculating theoretical bilges of each segment according to the section size of each segment, and recording all theoretical bilges in an excel table;
s3, building each segment;
s4, carrying out segmentation of the double-layer bottom part, measuring the actual bilge of the segmentation of the double-layer bottom part after carrying, and recording the bilge change value of the segmentation of the double-layer bottom part in an excel table;
and S5, adjusting the carrying of the side part segments according to the bilge change value of the double-layer bottom part segments.
Preferably, in the step S5, the specific step of adjusting the loading of the side section according to the bilge variation value of the double-layer bottom section is as follows:
if the actual bilge of the double-layer bottom part section is smaller than the theoretical bilge, when the broadside part section is carried, the carrying gap between the broadside part section and the double-layer bottom part section is increased so as to increase the welding line width;
if the actual bilge of the double bottom part section is larger than the theoretical bilge, the carrying gap between the portside part section and the double bottom part section is reduced to reduce the weld width or the sectional structure of the portside part is cut and corrected when the portside part section is carried.
Preferably, the side section includes a side bottom section and a side top section, and when the side section is carried, the side bottom section is carried first and then the side top section is carried;
when the actual bilge capacity of the double-layer bottom part section is smaller than the theoretical bilge capacity, if the carrying gap between the side bottom section and the double-layer bottom part section is increased, carrying the side top section normally according to the design size; if the side bottom section is normally carried according to the design size, the carrying gap between the side top section and the side bottom section is increased;
when the actual bilge capacity of the double-layer bottom part section is larger than the theoretical bilge capacity, if the carrying gap between the side bottom section and the double-layer bottom part section is reduced, carrying the side top section normally according to the design size; if the side bottom section is normally mounted according to the design dimensions, the mounting gap between the side top section and the side bottom section is reduced.
The beneficial effects of the invention are as follows:
by inputting the deviation values of all the carried segments into the excel table, the influence condition of the positioning deviation of the carried segments on the whole cabin capacity can be automatically calculated, and the carrying condition of the subsequent segments can be adjusted in a targeted manner so as to accurately control the cabin capacity of the LNG cargo hold.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exploded schematic view of an LNG cargo tank.
Fig. 2 is a schematic cross-sectional view of the LNG cargo tank corresponding to each segment.
Fig. 3 is a theoretical hold of each segment of an LNG cargo tank.
Fig. 4 is an established excel table.
Fig. 5 is a schematic diagram of the effects of piggyback positioning bias on bilge for sections 344 and 345.
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present application is described in further detail below by way of specific embodiments and with reference to the accompanying drawings.
The invention provides an LNG hold control method, which specifically comprises the following steps:
s1, decomposing the LNG cargo tank into a plurality of segments according to the segment division diagram.
S2, calculating the theoretical bilge of each segment according to the section size of each segment, and recording all theoretical bilge data in an excel table.
S3, building each segment.
S4, carrying out segmentation of the double-layer bottom part, measuring the actual bilge of the segmentation of the double-layer bottom part after carrying, and recording the bilge change value of the segmentation of the double-layer bottom part in an excel table.
Normally, the LNG cargo tanks are mounted in the order from bottom to top and from tail to head. The LNG cargo tank may be divided into a double bottom portion, a side portion and a cross bulkhead portion, the side portion being divided into a side bottom portion and a side top portion.
And S5, adjusting the carrying of the side part segments according to the bilge change value of the double-layer bottom part segments.
Specifically, the specific steps of adjusting the loading of the side section according to the bilge variation value of the double-layer bottom section are as follows:
if the actual bilge of the double bottom portion segment is smaller than the theoretical bilge (bilge variation value is larger than allowable error), then when the broadside portion segment is carried, the carrying gap between the broadside portion segment and the double bottom portion segment is increased to increase the weld width. When the side part sections are carried, the side bottom sections are carried firstly, then the side top sections are carried, and if the carrying gap between the side bottom sections and the double-layer bottom part sections is increased, the side top sections are normally carried according to the design size; if the side bottom section is normally mounted according to the design dimensions, the mounting gap between the side top section and the side bottom section is increased.
If the actual bilge of the double bottom part section is larger than the theoretical bilge (bilge variation value is larger than the allowable error), then when the broadside part section is carried, the carrying gap between the broadside part section and the double bottom part section is reduced to reduce the weld width, or the sectional structure of the broadside part is cut and corrected. When the side part sections are carried, the side bottom sections are carried firstly, and then the side top sections are carried, and if the carrying gap between the side bottom sections and the double-layer bottom section is reduced, the side top sections are normally carried according to the design size; if the side bottom section is normally mounted according to the design dimensions, the mounting gap between the side top section and the side bottom section is reduced.
If the difference value between the actual bilge of the double-layer bottom section and the theoretical bilge thereof is within the allowable error range, carrying can be carried according to the conventional operation when the side bottom section is carried, after the side bottom section is carried, the actual bilge is measured and the bilge variation value is recorded in an excel table, and if the actual bilge of the side bottom section is smaller than the theoretical bilge, the carrying gap between the side bottom section and the side bottom section is increased when the side top section is carried, so that the welding seam width is increased; if the actual hold of the side bottom section is larger than the theoretical hold, then when the side top section is carried, the carrying gap between the side top section and the side bottom section is reduced to reduce the welding line width, or the structure of the side bottom section is cut and corrected; if the difference between the actual hold of the side bottom section and its theoretical hold is within the allowable tolerance, the side top section is normally carried in normal operation.
The following is a description of specific embodiments of the invention by way of example.
As shown in fig. 1, the LNG cargo tank is decomposed into a plurality of segments. According to the position of each segment, the corresponding theoretical bilge is calculated through the sectional size of the segment, and all theoretical bilge data are recorded in an excel table, as shown in fig. 2, 3 and 4, the box marked by oblique lines in fig. 4 means that the corresponding segment has no influence on the bilge in a certain direction.
After the 344 subsection locating carrying of the double-layer bottom part is finished, the 345 subsection locating welding finds that the length direction is 6mm shorter, the height direction is 5mm lower, and the bilge is reduced by 0.87m due to the fact that the length is 6mm shorter 3 A height of 5mm lower results in an increase in bilge of 0.84m 3 The actual bilge of the 345 segments is reduced by 0.03m compared with the theoretical bilge as a whole 3 These deviation data are filled into an excel table as shown in fig. 5. The actual bilge due to 345 segments is reduced by only 0.03m from the theoretical bilge 3 It is therefore considered that such positioning has substantially no effect on the bilge volume and subsequent segments can be carried.
By inputting the deviation values of all the carried segments into the excel table, the influence condition of the positioning deviation of the carried segments on the whole cabin capacity can be automatically calculated, and the carrying condition of the subsequent segments can be adjusted in a targeted manner so as to accurately control the cabin capacity of the LNG cargo hold.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (1)
1. The LNG bilge control method is characterized by comprising the following steps of:
s1, decomposing an LNG cargo hold into a plurality of segments according to a segment division diagram;
s2, calculating theoretical bilges of each segment according to the section size of each segment, and recording all theoretical bilges in an excel table;
s3, building each segment;
s4, carrying out segmentation of the double-layer bottom part, measuring the actual bilge of the segmentation of the double-layer bottom part after carrying, and recording the bilge change value of the segmentation of the double-layer bottom part in an excel table;
s5, carrying the side part segments is adjusted according to the bilge change value of the double-layer bottom part segments;
if the actual bilge of the double-layer bottom part section is smaller than the theoretical bilge, when the broadside part section is carried, the carrying gap between the broadside part section and the double-layer bottom part section is increased so as to increase the welding line width; when the side part sections are carried, the side bottom sections are carried firstly, then the side top sections are carried, and if the carrying gap between the side bottom sections and the double-layer bottom part sections is increased, the side top sections are normally carried according to the design size; if the side bottom section is normally carried according to the design size, the carrying gap between the side top section and the side bottom section is increased;
if the actual bilge capacity of the double-layer bottom part section is larger than the theoretical bilge capacity, when the broadside part section is carried, the carrying gap between the broadside part section and the double-layer bottom part section is reduced to reduce the welding line width, or the sectional structure of the broadside part is cut and corrected; when the side part sections are carried, the side bottom sections are carried firstly, and then the side top sections are carried, and if the carrying gap between the side bottom sections and the double-layer bottom section is reduced, the side top sections are normally carried according to the design size; if the side bottom section is normally carried according to the design size, the carrying gap between the side top section and the side bottom section is reduced;
if the difference value between the actual bilge of the double-layer bottom section and the theoretical bilge thereof is within the allowable error range, carrying can be carried according to the conventional operation when the side bottom section is carried, after the side bottom section is carried, the actual bilge is measured and the bilge variation value is recorded in an excel table, and if the actual bilge of the side bottom section is smaller than the theoretical bilge, the carrying gap between the side bottom section and the side bottom section is increased when the side top section is carried, so that the welding seam width is increased; if the actual hold of the side bottom section is larger than the theoretical hold, then when the side top section is carried, the carrying gap between the side top section and the side bottom section is reduced to reduce the welding line width, or the structure of the side bottom section is cut and corrected; if the difference between the actual hold of the side bottom section and its theoretical hold is within the allowable tolerance, the side top section is normally carried in normal operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024792.2A CN113715987B (en) | 2021-09-02 | 2021-09-02 | LNG (liquefied Natural gas) bilge control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024792.2A CN113715987B (en) | 2021-09-02 | 2021-09-02 | LNG (liquefied Natural gas) bilge control method |
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| Publication Number | Publication Date |
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| CN113715987A CN113715987A (en) | 2021-11-30 |
| CN113715987B true CN113715987B (en) | 2024-03-26 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0212750D0 (en) * | 2002-05-31 | 2002-07-10 | Intelligent Engineering Ltd Bs | Hulls |
| CN106956747A (en) * | 2017-03-31 | 2017-07-18 | 中船第九设计研究院工程有限公司 | The accuracy control method of multi-purpose cargo ship cargo hold topside segment carrying |
| CN107421482A (en) * | 2017-09-01 | 2017-12-01 | 上海江南长兴造船有限责任公司 | A kind of method that qualified degree of LNG ship volume of compartment judges |
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2021
- 2021-09-02 CN CN202111024792.2A patent/CN113715987B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0212750D0 (en) * | 2002-05-31 | 2002-07-10 | Intelligent Engineering Ltd Bs | Hulls |
| CN106956747A (en) * | 2017-03-31 | 2017-07-18 | 中船第九设计研究院工程有限公司 | The accuracy control method of multi-purpose cargo ship cargo hold topside segment carrying |
| CN107421482A (en) * | 2017-09-01 | 2017-12-01 | 上海江南长兴造船有限责任公司 | A kind of method that qualified degree of LNG ship volume of compartment judges |
Non-Patent Citations (1)
| Title |
|---|
| 燃料舱三维数学模型的构建;杨宏伟等;《船舶标准化与质量》(第293期);15-18 * |
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| CN113715987A (en) | 2021-11-30 |
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