CN114309883B - Installation precision control method for liquefied natural gas ship liquid cargo pump folding pipe - Google Patents
Installation precision control method for liquefied natural gas ship liquid cargo pump folding pipe Download PDFInfo
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- CN114309883B CN114309883B CN202210028451.0A CN202210028451A CN114309883B CN 114309883 B CN114309883 B CN 114309883B CN 202210028451 A CN202210028451 A CN 202210028451A CN 114309883 B CN114309883 B CN 114309883B
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- 239000007788 liquid Substances 0.000 title claims abstract description 33
- 238000009434 installation Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 124
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a method for controlling the installation precision of a folding pipe of a liquid cargo pump of a liquefied natural gas ship, which comprises the steps of installing a plurality of rotary targets on the upper flange surface of the lower flange of the folding pipe, measuring the levelness of the flange surface at the position where the rotary targets are installed after backing welding and filling welding by using a total station to judge the welding deformation direction of the folding pipe, correcting the welding shrinkage deformation of the folding pipe by changing the welding angle of one welding line, accurately aligning the flange hole of the lower flange of the folding pipe with the flange hole of a second preassembled pipe flange, greatly improving the installation precision of the folding pipe, and prolonging the service life of the folding pipe of the liquid cargo pump.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a method for controlling the installation accuracy of a liquid cargo pump folding pipe of a liquefied natural gas ship.
Background
The LNG ship is also cargo tank for storing LNG cargo having a liquid temperature of-163 c, and is internally provided with a cargo pump for pumping out the LNG cargo. When the liquid cargo pump is installed, the installation of the folding pipe of the liquid cargo pump needs to be very accurate, so that the service life of the liquid cargo pump body can be guaranteed.
Because the liquid cargo pump closure pipe is formed by splicing multiple sections of bulk pipes, when the splice joint on the closure pipe is welded, the closure pipe is clamped between the upper pre-assembled pipe and the lower pre-assembled pipe of the liquid cargo pump and is not locked with the pre-assembled pipe of the liquid cargo pump through bolts, so that in the welding process, the closure pipe body is contracted to a certain extent due to the welding deformation of the pipe sections at the welding seams of the closure pipe, a certain dislocation can occur between the flange holes of the lower flange of the closure pipe and the flange holes of the pre-assembled pipe under the liquid cargo pump after each bottoming welding, the flange holes of the lower flange of the closure pipe and the flange holes of the pre-assembled pipe under the liquid cargo pump cannot be aligned, a certain horn mouth exists between the two flange faces, and the lower end of the closure pipe cannot be accurately aligned with the pre-assembled pipe under the liquid cargo pump, so that the closure pipe cannot be installed.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling the installation accuracy of the folding pipe of the liquid cargo pump of the lng carrier, which is used for solving the problems in the prior art.
The method for controlling the installation precision of the folding pipe of the liquid cargo pump of the liquefied natural gas ship specifically comprises the following steps:
s1, installing a folding pipe between two preassembled pipes of a liquid cargo pump;
The folding pipe is formed by splicing a plurality of sections of loose tubes, welding seams between two adjacent sections of loose tubes are welded through backing welding and filling welding, an upper flange of the folding pipe is locked and fixed with a first preassembled pipe flange through bolts and nuts, and only bolts are penetrated in flange holes of a lower flange of the folding pipe and a second preassembled pipe flange and are not locked through the nuts;
S2, installing a plurality of rotary targets on the upper flange surface of the lower flange of the folding pipe;
S3, removing bolts penetrating through flange holes of the lower flange of the folding pipe and the flange of the second preassembly pipe;
S4, measuring the levelness of each rotary target by using a total station, and correcting the welding shrinkage deformation of the folding pipe by changing the welding angle of one of the welding seams in the process of carrying out cover welding on all the welding seams according to the measurement result so as to accurately align the flange hole of the lower flange of the folding pipe with the flange hole of the flange of the second preassembly pipe.
Preferably, the specific step of installing the folding pipe between the two preassembled pipes of the liquid cargo pump in the step S1 is as follows:
Preparing a plurality of sections of scattered pipes, and polishing a weld groove at the spliced end part of each section of scattered pipe;
All bulk pipes are pre-installed between a first pre-installed pipe and a second pre-installed pipe in sequence, wherein the first section of bulk pipe is locked and fixed with a first pre-installed pipe flange through bolts and nuts, and bolts between the tail end bulk pipe and the second pre-installed pipe flange are not locked;
embedding an embedded iron in a welding line between two adjacent sections of preassembled pipes, and performing spot welding fixation on the contact position of the embedded iron and the preassembled pipes;
and (3) sequentially performing backing welding and filling welding on each welding seam according to the sequence from top to bottom to form the folding pipe.
Preferably, the weld gap between two adjacent lengths of pre-assembled tubes should be maintained between 2mm and 4mm when all of the bulk tubes are pre-assembled between the first pre-assembled tube and the second pre-assembled tube.
Preferably, when each weld joint is subjected to backing welding and filling welding, the welding wire is perpendicular to the pipe section at the position of the weld joint.
Preferably, in step S4, when correcting the welding shrinkage deformation of the folded pipe, the welding wire should be inclined to form a set included angle with the welding seam when one welding seam performs the cap welding, and the welding wire is still perpendicular to the pipe section at the position of the welding seam when the other welding seam performs the cap welding.
Preferably, the welding wire should be inclined downward and form an angle of 45 degrees with the horizontal plane when one of the welding seams performs the face welding.
Preferably, when the backing welding, the filling welding and the cover welding are performed, the welding current, the arc voltage and the welding speed are equal.
The beneficial effects of the invention are as follows:
1. According to the invention, the plurality of rotary targets are arranged on the upper flange surface of the lower flange of the folding pipe, and the levelness of the flange surface at the rotary targets is measured by using the total station to judge the welding deformation direction of the folding pipe, so that the welding shrinkage deformation of the folding pipe is corrected by changing the welding angle of one welding line, the flange hole of the lower flange of the folding pipe is accurately aligned with the flange hole of the second preassembled pipe flange, the installation precision of the folding pipe is greatly improved, and the service life of the folding pipe of the liquid cargo pump is prolonged.
2. The method is simple and convenient to operate, can improve the installation efficiency of the folding pipe of the liquid cargo pump, reduces the labor force and the construction working hours, and reduces the production and construction costs of enterprises.
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 a schematic installation view of a liquid cargo pump closure tube.
Fig. 2 is a schematic view of a rotary target mounted on a lower flange of a closed pipe.
The meaning of the reference numerals in the figures is:
1 is a folding pipe, 2 is a folding pipe upper flange, 3 is a folding pipe lower flange, 4 is a first pre-assembled pipe, 5 is a second pre-assembled pipe, 6 is a rotating target, 7 is a scattered pipe, 8 is a first pre-assembled pipe flange, 9 is a second pre-assembled pipe flange, and 10 is a welding seam.
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 application will now be described in further detail with reference to specific examples thereof in connection with the accompanying drawings.
In the description of the present specification, it should be understood that the terms "upper", "lower", "left", "right" and the like in the embodiments of the present application are described in terms of angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.
The invention provides a method for controlling the installation precision of a folding pipe of a liquid cargo pump of a liquefied natural gas ship, which specifically comprises the following steps:
S1, installing the folding pipe 1 between two preassembled pipes of the liquid cargo pump.
The folding pipe 1 is formed by splicing a plurality of sections of bulk pipes 7, and welding seams between two adjacent sections of bulk pipes are welded through backing welding and filling welding.
The upper end of the folding pipe 1 is provided with a folding pipe upper flange 2 at a position where the upper end of the folding pipe 1 is connected with a first pre-loading pipe 4 of the liquid cargo pump, and the lower end of the folding pipe 1 is provided with a folding pipe lower flange 3 at a position where the lower end of the folding pipe 1 is connected with a second pre-loading pipe 5 of the liquid cargo pump. The upper closure pipe flange 2 is locked and fixed with the first preassembled pipe flange 8 through bolts and nuts, and only bolts are penetrated in flange holes of the lower closure pipe flange 3 and the second preassembled pipe flange 9 but are not locked through nuts.
Specifically, the specific steps of installing the folding pipe between two preassembled pipes of the liquid cargo pump are as follows:
firstly, preparing a plurality of sections of loose tubes according to a construction drawing, and respectively polishing weld grooves at the spliced end parts of each section of loose tube 7;
Then, all bulk pipes are pre-assembled between the first pre-assembled pipe 4 and the second pre-assembled pipe 5 in sequence, wherein when the first bulk pipe is connected with the first pre-assembled pipe 4, the first bulk pipe is locked and fixed with the first pre-assembled pipe flange 8 through bolts and nuts, after the first bulk pipe is assembled, other bulk pipes are sequentially spliced, finally, the tail end bulk pipe is installed, and only bolts are penetrated between the tail end bulk pipe and the second pre-assembled pipe flange 9 but the bolts are not locked; the gap between the welding lines 10 between two adjacent segments of preassembled pipes is kept between 2mm and 4mm;
Then, embedding an embedded iron in a welding line 10 between two adjacent sections of preassembled pipes, and performing spot welding and fixing on the contact position of the embedded iron and the preassembled pipes;
Finally, each weld 10 is subjected to backing welding and filling welding in sequence from top to bottom or from bottom to top, and all the bulk pipes 7 are assembled to form a closed pipe 1.
When in backing welding and filling welding, the welding wire is vertical to the pipe section at the position of the welding line.
S2, a plurality of rotary targets 6 are arranged on the upper flange surface of the folding pipe lower flange 3, and the rotary targets 6 are uniformly arranged in the circumferential direction of the upper flange surface.
S3, removing bolts penetrating through flange holes of the folding pipe lower flange 3 and the second preassembled pipe flange 9.
S4, measuring the levelness of each rotary target 6 by using a total station (monitoring the three-dimensional coordinates of each rotary target by using the total station), and correcting the welding shrinkage deformation of the folding pipe 1 by changing the welding angle of one of the welding seams in the process of performing cover welding on all the welding seams 10 according to the measurement result so as to accurately align the flange hole of the folding pipe lower flange 3 with the flange hole of the second preassembly pipe flange 9.
When correcting the welding shrinkage deformation of the folded pipe 1, the welding wire should incline to form a set included angle with one welding line when the welding line is subjected to the cover welding, and the welding wire is still vertical to the pipe section at the position of the welding line when the welding line is subjected to the cover welding.
As shown in fig. 2, in the present embodiment, three rotary targets, namely, a rotary target 1, a rotary target 2, and a rotary target 3, are provided on the upper flange surface of the folding pipe lower flange 3. After measuring the levelness of each rotating target by using the total station, if the levelness of the flange surface at the positions of the rotating target 1 and the rotating target 2 is equal, but the levelness of the flange surface at the position of the rotating target 3 is lower or higher than that of the rotating target 1 and the rotating target 2, the welding shrinkage deformation of the folding pipe 1 can be corrected by changing one welding line welding angle (such as changing the welding line welding angle of the lowest welding line), namely, forming a certain included angle between the welding line and the horizontal plane, so that the flange hole of the lower flange 3 of the folding pipe is accurately aligned with the flange hole of the flange 9 of the second preassembly pipe.
Preferably, the welding wire should be inclined downward and form an angle of 45 degrees with the horizontal plane when one of the welding seams performs the face welding.
Preferably, when the backing welding, the filling welding and the cover welding are performed, the welding current, the arc voltage and the welding speed are equal.
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 (5)
1. The method for controlling the installation precision of the folding pipe of the liquid cargo pump of the liquefied natural gas ship is characterized by comprising the following steps of:
s1, installing a folding pipe between two preassembled pipes of a liquid cargo pump;
The folding pipe is formed by splicing a plurality of sections of loose tubes, welding seams between two adjacent sections of loose tubes are welded through backing welding and filling welding, an upper flange of the folding pipe is locked and fixed with a first preassembled pipe flange through bolts and nuts, and only bolts are penetrated in flange holes of a lower flange of the folding pipe and a second preassembled pipe flange and are not locked through the nuts;
specifically, preparing a plurality of sections of scattered pipes, and polishing a weld groove at the spliced end part of each section of scattered pipe; all bulk pipes are pre-installed between a first pre-installed pipe and a second pre-installed pipe in sequence, wherein the first section of bulk pipe is locked and fixed with a first pre-installed pipe flange through bolts and nuts, and bolts between the tail end bulk pipe and the second pre-installed pipe flange are not locked; embedding an embedded iron in a welding line between two adjacent sections of preassembled pipes, and performing spot welding fixation on the contact position of the embedded iron and the preassembled pipes; sequentially performing backing welding and filling welding on each welding seam according to the sequence from top to bottom to form a folding pipe;
S2, installing a plurality of rotary targets on the upper flange surface of the lower flange of the folding pipe;
S3, removing bolts penetrating through flange holes of the lower flange of the folding pipe and the flange of the second preassembly pipe;
s4, measuring the levelness of each rotary target by using a total station, and correcting the welding shrinkage deformation of the folding pipe by changing the welding angle of one of the welding seams in the process of performing cover welding on all the welding seams according to the measurement result so as to accurately align the flange hole of the lower flange of the folding pipe with the flange hole of the flange of the second preassembly pipe;
When correcting the welding shrinkage deformation of the folded pipes, the welding wire should incline to form a set included angle with one welding line when the welding line is subjected to the cover welding, and the welding wire is still vertical to the pipe section at the position of the welding line when the welding line is subjected to the cover welding.
2. The method for controlling the installation accuracy of the folding pipes of the liquid cargo pump of the liquefied natural gas carrier according to claim 1, wherein when all the bulk pipes are pre-installed between the first pre-installed pipe and the second pre-installed pipe, the weld gap between the two adjacent pre-installed pipes is kept between 2mm and 4mm.
3. The method for controlling the installation accuracy of the closed pipe of the liquid cargo pump of the liquefied natural gas carrier according to claim 1, wherein the welding wire is perpendicular to the pipe section at the position of the welding seam when the backing welding and the filling welding are performed on each welding seam.
4. The method for controlling the installation accuracy of the closed pipe of the liquid cargo pump of the liquefied natural gas carrier according to claim 1, wherein the welding wire is inclined downward and forms an angle of 45 degrees with the horizontal plane when one of the welding seams is subjected to the face welding.
5. The method for controlling the installation accuracy of the liquid cargo pump closure pipe of the liquefied natural gas carrier according to claim 1, wherein the welding current, the arc voltage and the welding speed are equal in the case of backing welding, filling welding and face welding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210028451.0A CN114309883B (en) | 2022-01-11 | 2022-01-11 | Installation precision control method for liquefied natural gas ship liquid cargo pump folding pipe |
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| CN202210028451.0A CN114309883B (en) | 2022-01-11 | 2022-01-11 | Installation precision control method for liquefied natural gas ship liquid cargo pump folding pipe |
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| CN114309883B true CN114309883B (en) | 2024-05-17 |
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| CN115848584B (en) * | 2022-11-08 | 2024-06-11 | 沪东中华造船(集团)有限公司 | Manufacturing and installing method of folding pipe of marine flexible hose capable of being deformed greatly |
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