Pump tower main pump pipe assembling and positioning device and method

Abstract

The invention discloses a device and a method for assembling and positioning a main pump pipe of a pump tower. The device comprises a horizontal supporting rod, the first ends of the two reinforcing plate assemblies are connected with the two ends of the horizontal supporting rod correspondingly. The upper surfaces of the two flange face connecting plates are connected with the second ends of the two reinforcing plate assemblies in a one-to-one correspondence mode, and the lower surfaces of the two flange face connecting plates are detachably connected with branch pipe flanges on the port and the starboard of a main pump pipe of the pump tower. Deviation generated by installation and welding is greatly reduced, meanwhile, the qualification of the previous procedure is conveniently checked, and the method has the advantages of being high in reliability and stability, easy to manufacture and low in cost and can be applied to accurate positioning and installation of pump tower main pump pipes of the same series and the same size in batches.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump tower main pump pipe assembly, in particular to a pump tower main pump pipe assembly positioning device and method. BACKGROUND

[0002] The pump tower is an important functional component of the fuel tank and liquid cargo tank of an LNG transport ship and an LNG dual-fuel ship, usually in the form of a triangular mast, vertically suspended in each cargo tank or fuel tank, and mainly responsible for the function of loading and unloading liquefied natural gas. As a core component of the pump tower, the main pump pipe is also one of the structural main bodies of the pump tower, and its main function is to output liquid natural gas to the receiving station. In the cargo tank, the branch pipe of the main pump pipe is connected to the main liquid cargo pump through a check valve and a connecting pipe, and the size spacing and angle of the left and right main pump pipes and the branch pipe need to be strictly guaranteed to ensure the close fit of the flanges, so the installation precision requirement is very high. Since the temperature of LNG is extremely low (about -162℃), the main pump pipe is usually made of low-temperature stainless steel 304L material to withstand thermal stress and mechanical load in a low-temperature environment.

[0003] In the prior art, the structure and connection mode of the main pump pipe are shown in Figure 1 During construction, the horizontal plane structure pipe is usually manufactured first, and the traditional construction method is to place the left and right main pump pipes on the jig according to the position, measure the center distance of the branch pipe flange and the angle of the branch pipe using a tape measure and an angle ruler, and then assemble and weld the support pipe in this state. However, this method has the following main problems: first, since the pump pipe material is low-temperature stainless steel 304L, its thermal expansion coefficient is large, and the pump pipe is prone to displacement and large angle deviation during construction, making it difficult to control the installation precision; second, when assembling and welding the support pipe, it is difficult to effectively ensure the front-to-back misalignment of the left and right main pump pipes, which may introduce cumulative errors; third, it is difficult to effectively check and verify the pre-assembly components (such as the main pump pipe and the branch pipe) of the previous process, which has a high potential risk. These problems not only affect the overall structural stability and functional reliability of the pump tower, but also may cause the flanges to not fit when connecting the liquid cargo pump, increasing the safety hazards and maintenance costs during ship operation. Therefore, the existing installation method cannot meet the high precision requirement, and a simple and practical positioning device is needed to solve the above problems and improve the installation efficiency and quality. SUMMARY

[0004] The purpose of the present application is to provide a pump tower main pump pipe assembly positioning device and method to solve the problem of displacement and large angle deviation of the main pump pipe during construction in the prior art, which makes it difficult to control the installation precision of the main pump pipe.

[0005] To achieve the above purpose, the present application realizes the following technical solutions: In one aspect, the present application provides a pump tower main pump pipe assembly positioning device, comprising: a horizontal support rod; two reinforcement plate assemblies, the first ends of the two reinforcement plate assemblies are respectively connected with the two ends of the horizontal support rod; two flange face connecting plates, the upper surfaces of the two flange face connecting plates are respectively connected with the second ends of the two reinforcement plate assemblies one by one, wherein the lower surfaces of the two flange face connecting plates are respectively detachably connected with the branch pipe flanges on the port side and the starboard side of the pump tower main pump pipe.

[0006] Preferably, the horizontal support rod is a telescopic rod, which comprises a telescopic section and two fixed sections connected with the two ends of the telescopic section; at least one of the two fixed sections is provided with an adjusting member on the side close to the telescopic section.

[0007] Preferably, each of the reinforcement plate assemblies comprises a first reinforcement plate and a second reinforcement plate, and the first reinforcement plate and the second reinforcement plate are respectively fixedly connected with the horizontal support rod and the flange face connecting plate by welding.

[0008] Preferably, grooves are formed in the two ends of the horizontal support rod, and the two reinforcement plate assemblies are respectively arranged in the corresponding grooves.

[0009] Preferably, a plurality of through holes corresponding to the branch pipe flanges of the pump tower main pump pipe are formed in the flange face connecting plate, and the through holes are tightly connected with the branch pipe flanges by connecting members.

[0010] Preferably, the yield strength of the horizontal support rod is not less than 170 MPa.

[0011] Preferably, the yield strength of the reinforcement plate assemblies is not less than 170 MPa, and the thickness of the reinforcement plate assemblies is not less than 10 mm.

[0012] In another aspect, the present application also provides a pump tower main pump pipe assembly positioning method, which adopts the pump tower main pump pipe assembly positioning device described above, and the method comprises the following steps: placing the port side and the starboard side of the pump tower main pump pipe on the jig respectively, and adjusting the center distance and the angle of the branch pipe flanges on the port side and the starboard side of the pump tower main pump pipe according to the preset theoretical data; previously welding and fixing the second reinforcement plate of the reinforcement plate assembly with the upper surface of the flange face connecting plate; connecting the two flange face connecting plates in the pump tower main pump pipe assembly positioning device with the two branch pipe flanges by connecting members; assembling and fixing the two ends of the horizontal support rod with the first reinforcement plate and the second reinforcement plate of the reinforcement plate assembly; Measure the distance data on the pump tower main pump pipe assembly positioning device, obtain measurement data, and compare the measurement data with the corresponding preset theoretical value to realize the positioning of the pump tower main pump pipe assembly.

[0013] Preferably, if the deviation between the measurement data and the corresponding preset theoretical value is not greater than the preset deviation, the horizontal support rod, the reinforcing plate assembly and the flange face connecting plate are welded, and the length of the horizontal support rod is fixed by the adjusting piece.

[0014] Compared with the prior art, the present application has the following beneficial effects: The pump tower main pump pipe assembly positioning device and method provided by the present application realize accurate positioning and fixing of the pump tower main pump pipe branch flange of an LNG ship, effectively control the center distance and angle of the left and right main pump pipe flanges, solve the displacement deviation, angle deviation and left and right side front and rear misalignment problems caused by the large material thermal expansion coefficient in the traditional installation method, ensure the close fit and overall installation precision of the flange, thereby improving the structural stability and functional reliability of the pump tower, and reducing the safety hazards and maintenance costs in ship operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description. Obviously, the drawings in the following description are one embodiment of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings: Figure 1 A schematic diagram of the pump tower main pump pipe in the prior art; Figure 2 A structural schematic diagram of the pump tower main pump pipe assembly positioning device provided by an embodiment of the present application; Figure 3 A top view of the pump tower main pump pipe assembly positioning device provided by an embodiment of the present application; Figure 4 A schematic diagram of the installation of the pump tower main pump pipe assembly positioning device on the main pump pipe provided by an embodiment of the present application.

[0016] Explanation of reference numerals: 11-left main pump pipe; 12-right main pump pipe; 13-support pipe; 14-cradle; 15-branch flange; 01-horizontal support rod; 02-flange face connecting plate; 03-first reinforcing plate; 04-second reinforcing plate; 05-connecting piece; 06-adjusting piece. DETAILED DESCRIPTION

[0017] The following will be described in combination with the drawings: Figures 1-4And the specific embodiments are further described in detail. According to the following description, the advantages and features of the present application will be more apparent. It should be noted that the drawings are very simplified and all use non-precise proportions, only for the purpose of facilitating, clear and assisting the description of the embodiments of the present application. In order to make the purpose, features and advantages of the present application more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation of the present application. Therefore, any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose of the present application, should still fall within the scope of the disclosed technology.

[0018] The present embodiment mainly solves the problem that the main pump pipe is prone to displacement and large angle deviation during construction in the prior art, and the installation precision of the main pump pipe is difficult to control.

[0019] Reference Figure 2 and Figure 3 , the present embodiment provides a pump tower main pump pipe assembly positioning device, which comprises: a horizontal support rod 01, two reinforcing plate assemblies and two flange face connecting plates 02. The first ends (the upper ends of the first reinforcing plate 03 and the second reinforcing plate 04 in Figure 2 and Figure 3 ) of the two reinforcing plate assemblies are respectively connected with the two ends of the horizontal support rod 01; the upper surfaces of the two flange face connecting plates 02 are respectively connected with the second ends (the lower ends of the first reinforcing plate 03 and the second reinforcing plate 04 in Figure 2 and Figure 3 ), and the lower surfaces of the two flange face connecting plates 02 are respectively detachably connected with the branch pipe flanges 15 on the port side 11 of the main pump pipe and the starboard side 12 of the main pump pipe. The device fixes the branch pipe flanges 15 of the main pump pipe, controls the center distance and angle of the flanges, greatly reduces the deviation caused by installation and welding, and is convenient for checking the qualification of the previous process. It has the characteristics of high reliability and stability, simple production, low cost, and can be applied to batch positioning and installation of the same series and size of pump tower main pump pipe.

[0020] The horizontal support rod 01 is a telescopic rod (such as a threaded adjusting mechanism or a buckle type adjuster), which comprises: a telescopic section and two fixed sections connected with the two ends of the telescopic section; at least one of the two fixed sections is provided with an adjusting member 06 on the side close to the telescopic section. Referring to Figure 2As shown, the left one of the two fixing segments is provided with an adjusting member 06, and the right one of the two fixing segments is fixedly connected with the right end of the telescopic segment. After adjusting the length of the telescopic segment to a proper position, the telescopic segment and the left fixing segment are fixed by rotating the adjusting member 06, so that the length of the horizontal support rod 01 remains unchanged. The telescopic horizontal support rod 01 is convenient for adjusting according to the center distance of the main pump pipe of different pump towers, and improves the applicability of the device.

[0021] Each of the reinforcing plate assemblies comprises a first reinforcing plate 03 and a second reinforcing plate 04, which are respectively fixedly connected with the horizontal support rod 01 and the flange surface connecting plate 02 by welding. The yield strength of the reinforcing plate assemblies is not less than 170 MPa, and the thickness of the reinforcing plate assemblies is not less than 10 mm. The first reinforcing plate 03 is mainly used for fixing the end of the horizontal support rod 01, and the second reinforcing plate 04 is mainly used for fixing the flange surface connecting plate 02, forming a double-layer reinforcing structure. This design can effectively disperse stress, prevent single-point failure, and improve overall rigidity. The material of the reinforcing plate assemblies is selected to be a stainless steel plate (such as 304L stainless steel) with a yield strength not less than 170 MPa and a thickness not less than 10 mm, so as to ensure the bending resistance and torsional resistance in the welding and installation process. The material of the flange surface connecting plate 02 is also selected to be a stainless steel plate (such as 304L stainless steel) with a yield strength not less than 170 MPa.

[0022] Grooves are formed at the two ends of the horizontal support rod 01, and the two reinforcing plate assemblies are arranged in the corresponding grooves, so as to enhance the connection stability and positioning accuracy of the reinforcing plate assemblies.

[0023] A plurality of through holes corresponding to the branch flanges 15 of the pump tower main pump pipe are formed in the flange surface connecting plate 02, and the through holes are fastened with the branch flanges 15 through connecting members 05. The connecting members 05 are fastening bolt sets, which comprise at least 8 sets of outer hexagonal bolts and nuts, and the material thereof is selected to be a stainless steel (such as 316L stainless steel) with a yield strength not less than 170 MPa.

[0024] The yield strength of the horizontal support rod 01 is not less than 170 MPa. The material of the horizontal support rod 01 is selected to be a stainless steel pipe (such as 304L stainless steel) with a yield strength not less than 170 MPa and a specification not less than Ø88.9x10 mm, and the length thereof is adjusted according to the center distance of the main pump pipe, which is usually in the range of 500 mm to 1500 mm, so as to ensure that the horizontal support rod 01 does not deform under tensile and bending stress in a low-temperature environment.

[0025] On the other hand, the embodiment also provides a pump tower main pump pipe assembly positioning method, which adopts the pump tower main pump pipe assembly positioning device, and the specific implementation process is as follows: Figure 4The provided installation schematic diagram of the pump tower main pump pipe assembly positioning device on the main pump pipe. The method comprises: Step S1: the port side 11 and the starboard side 12 of the pump tower main pump pipe are respectively placed on the jig 14, and the center distance and the angle of the branch pipe flange 15 on the port side 11 and the starboard side 12 of the pump tower main pump pipe are adjusted according to the preset theoretical data.

[0026] Step S2: the second reinforcing plate 04 of the reinforcing plate assembly is pre-welded and fixed with the upper surface of the flange surface connecting plate 02.

[0027] Step S3: the two flange surface connecting plates 02 in the pump tower main pump pipe assembly positioning device are connected with the two branch pipe flanges 15 respectively through the connecting piece 05.

[0028] Step S4: the two ends of the horizontal support rod 01 are assembled and fixed with the first reinforcing plate 03 and the second reinforcing plate 04 of the reinforcing plate assembly.

[0029] Step S5: the center distance and the angle data on the pump tower main pump pipe assembly positioning device are measured to obtain the measurement data, and the measurement data are compared with the corresponding preset theoretical value to realize the assembly positioning of the pump tower main pump pipe. The measurement data include: the innermost distance and the outermost distance of the two flange surface connecting plates on the center line of the two flange surfaces, and the corresponding distance between the through holes on the two flange surface connecting plates, as shown by L1, L2, L3 and L4 in the reference Figure 3 If the deviation between the measurement data and the corresponding preset theoretical value is not greater than the preset deviation, the horizontal support rod 01, the reinforcing plate assembly and the flange surface connecting plate 02 are welded, and the length of the horizontal support rod 01 is fixed through the adjusting piece 06. The preferred preset deviation in the embodiment is 0.5mm.

[0030] In summary, the embodiment proposes a pump tower main pump pipe assembly positioning device and method. Through the combined design of the horizontal support rod, the reinforcing plate assembly, the flange face connecting plate and the fastening bolt set, the precise positioning and fixing of the LNG ship pump tower main pump pipe branch flange are realized, the center distance and angle of the left and right main pump pipe flanges are effectively controlled, the displacement deviation, angle deviation and left and right side front and rear misalignment problems caused by the large material thermal expansion coefficient in the traditional installation method are solved, the close fit of the flange and the overall installation precision are ensured, thereby improving the structural stability and functional reliability of the pump tower, reducing the safety hazards and maintenance costs in ship operation. In addition, the device structure is simple, made of stainless steel and verified by finite element analysis, and has high reliability and stability; the telescopic design of the horizontal support rod further enhances the applicability of the device, which can be flexibly adjusted according to the center distance of the main pump pipe of different pump towers; the setting of the double reinforcing plate assembly disperses the stress and improves the bending and torsional resistance; the manufacturing cost is relatively low, facilitating batch production and application in the precise positioning and installation of the main pump pipe of the same series and size of pump tower. At the same time, the method is convenient for step-by-step assembly and checking the qualification of the previous process, improving the construction efficiency and quality control level.

[0031] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying that there is any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more limitations, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0032] It should be noted that the devices and methods disclosed in the embodiments herein can also be implemented in other ways. The device embodiments described above are only illustrative, for example, the block diagram in the drawings shows the devices, methods according to the embodiments herein. It should be noted that the combination of blocks in the block diagram can be used to perform the specified functions or actions to achieve.

[0033] Although the content of the present application has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present application. After reading the above content, various modifications and alternatives of the present application will be apparent to those skilled in the art. Therefore, the protection scope of the present application should be defined by the appended claims.

Claims

1. A pump tower main pump pipe assembly positioning device, characterized in that, The utility model relates to a pump tower main pump pipe assembly positioning device, which comprises the following parts: A horizontal support rod; Two reinforcing plate assemblies, the first ends of the two reinforcing plate assemblies being connected with the two ends of the horizontal support rod respectively; Two flange face connecting plates, the upper surfaces of the two flange face connecting plates being connected with the second ends of the two reinforcing plate assemblies respectively in one-to-one correspondence, wherein the lower surfaces of the two flange face connecting plates are detachably connected with the branch pipe flanges on the port sides and starboard sides of a pump tower main pump pipe.

2. The pump column main pump tube assembly positioning device of claim 1, wherein, The horizontal support rod is a telescopic rod, which comprises telescopic segments and two fixed segments connected with the two ends of the telescopic segments; at least one of the two fixed segments is provided with an adjusting member on the side close to the telescopic segment.

3. The pump column main pump tube assembly positioning device of claim 1, wherein, Each of the reinforcing plate assemblies comprises a first reinforcing plate and a second reinforcing plate, and the first reinforcing plate and the second reinforcing plate are fixedly connected with the horizontal support rod and the flange face connecting plate by welding respectively.

4. The pump column main pump tube assembly positioning device of claim 1, wherein, The two ends of the horizontal support rod are provided with grooves, and the two reinforcing plate assemblies are arranged in the corresponding grooves respectively.

5. The pump column main pump tube assembly positioning device of claim 1, wherein, The flange face connecting plate is provided with a plurality of through holes corresponding to the branch pipe flanges of the pump tower main pump pipe, and the through holes are fastened with the branch pipe flanges through connecting members.

6. The pump column main pump tube assembly positioning device of claim 1, wherein, The yield strength of the horizontal support rod is not less than 170 MPa.

7. The pump column main pump tube assembly positioning device of claim 1, wherein, The yield strength of the reinforcing plate assemblies is not less than 170 MPa, and the thickness of the reinforcing plate assemblies is not less than 10 mm.

8. A method of assembling and positioning a main pump tube of a pump tower, characterized in that The method comprises the following steps: Placing the port sides and starboard sides of the pump tower main pump pipe on a jig respectively, and adjusting the center distance and angle of the branch pipe flanges on the port sides and starboard sides of the pump tower main pump pipe according to the preset theoretical data; Pre-welding the second reinforcing plate of the reinforcing plate assembly with the upper surface of the flange face connecting plate; Connecting the two flange face connecting plates in the pump tower main pump pipe assembly positioning device with the two branch pipe flanges through connecting members; Assembling and fixing the two ends of the horizontal support rod through the first reinforcing plate and the second reinforcing plate of the reinforcing plate assembly; Measuring the distance data on the pump tower main pump pipe assembly positioning device to obtain measurement data, and comparing the measurement data with the corresponding preset theoretical value to realize the assembly positioning of the pump tower main pump pipe.

9. The method of claim 8, wherein the method further comprises: If the deviation between the measurement data and the corresponding preset theoretical value is not greater than the preset deviation, then welding the horizontal support rod, the reinforcing plate assembly and the flange face connecting plate, and fixing the length of the horizontal support rod through the adjusting member.

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