A tool and method for prefabricating the outlet pipe of a cryogenic liquid cargo pump on an LNG ship pump tower

Abstract

The present invention relates to the field of shipbuilding technology, specifically to a tool for prefabricating a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower, the structure of which includes a simulated pump for prefabricating the liquid cargo pump outlet pipe, a pump bracket for installing the simulated pump and equipped with a plurality of bolts, and a pump base for installing the pump bracket, the surrounding side surfaces of the bolts are equipped with nuts, and the outer side of the simulated pump is respectively equipped with a centering gasket for adjusting the installation position of the simulated pump and a square gasket for centering the simulated pump; and also includes a method for prefabricating the cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower. The tool for prefabricating the cryogenic liquid cargo pump outlet pipe of the present invention has the advantages of novel design and easy production. In addition, the entire prefabrication process of the outlet pipe can be completed under a horizontal platform in the workshop. On the one hand, it can effectively reduce the construction difficulty during the prefabrication of the tool, and on the other hand, during the prefabrication operation, workers do not need to board the ship and enter the liquid cargo tank for a long time to carry out construction and run back and forth.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a tool and method for prefabricating an outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower. Background Art

[0002] What distinguishes LNG ship construction from ordinary civilian ships is that it has a liquid cargo system and a maintenance system. The two systems are interdependent, with high construction difficulty and a long construction period. The installation of the pump tower, an important component of the liquid cargo system, must be carried out after the maintenance system is completed. The pump tower installation includes: overall hoisting and positioning of the pump tower, positioning of equipment on the pump tower, and installation of all pipelines. Among them, the installation of the two liquid cargo pumps and the production of the outlet pipes are particularly important. In the existing technology, there are many types of liquid cargo pumps. For example, the patent document with publication number CN104514723B discloses a marine vertical deep-well liquid cargo pump.

[0003] The liquid cargo pump structure has a pump outlet 1 at the top and a pump suction port 2 at the bottom. During installation, the pump body 5 needs to be fixedly combined with the two pump brackets 3 into one. A mounting gasket 6 is provided at the connection between the pump bracket 3 and the pump body 5. The upper plane of the pump body 5 and the reverse side of the pump bracket 3 are fixed with a circle of bolts. Eight shock-absorbing blocks 4 are also installed on the lower sides of the two pump brackets 3 to contact the pump body 5 to reduce the vibration of the pump body 5 during operation. The combination of the pump and the bracket is installed on the base of the pump tower bottom plate. There is a mounting gasket between the pump bracket 2 and the base for adjusting the height of the installation position.

[0004] The liquid cargo pump is imported equipment and is delivered late, so it cannot be pre-installed in advance. The liquid cargo pump weighs about 1.8 tons. Even if it can be pre-installed in the workshop in advance, the pump tower needs to be placed vertically and fixed. The pump tower is about 30 meters high and weighs about 35 tons. It is placed horizontally in the workshop. Placing it vertically requires the construction of a large tooling bracket, and wind and rain protection must also be considered, which requires a relatively large investment.

[0005] In the prior art, the conventional installation procedures for pump towers and liquid cargo pumps are as follows:

[0006] 1. After the maintenance system in the cargo tank is basically completed, the pump tower will be hoisted as a whole;

[0007] 2. After the pump tower is in place, position the pump tower as a whole so that the height L1 between its bottom and the bottom of the cabin meets the design requirements;

[0008] 3. Determine the positions of the two liquid cargo pumps according to the positioning of the pump tower so that the height L2 between the suction port and the bottom of the tank meets the design requirements. Adjust the installation gasket to determine this height and fix the position of the liquid cargo pumps;

[0009] 4. According to the location of the liquid cargo pump, determine the specific size of each outlet pipe on site, lay out on site, lift it out of the tank and complete the production, then lift it back into the liquid cargo tank for installation;

[0010] Since this section of the liquid cargo pump outlet pipe plays a very important role and has a large diameter, high production and positioning accuracy are required. The current construction method has the following problems:

[0011] 1. The construction period is long. Since the above processes need to be completed step by step, it usually takes two weeks, which has a great impact on the entire ship construction period;

[0012] 2. The construction is difficult. Since positioning and other work are all carried out on site, and there is no large lifting equipment in the liquid cargo tank, the actual liquid cargo pump weighs 1.8 tons, and operation and adjustment are relatively laborious.

[0013] 3. High labor intensity and poor safety. Workers need to go on board for a long time to enter the liquid cargo tank for construction, running back and forth, which increases labor intensity, reduces work efficiency and reduces construction safety;

[0014] Based on this, the present invention provides a tool and method for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower to solve the problems raised in the above background technology. Summary of the Invention

[0015] Aiming at the technical problems existing in the prior art, the present invention provides a tool and method for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower to solve the problems of long construction period, great construction difficulty and high labor intensity in the existing prefabrication of the outlet pipe of the liquid cargo pump.

[0016] The present invention solves the above-mentioned technical problems with the following technical solutions: a tool for prefabricating a cryogenic liquid cargo pump outlet pipe for an LNG ship pump tower, comprising a simulated pump for prefabricating the liquid cargo pump outlet pipe, two pump brackets for mounting the simulated pump and equipped with a plurality of bolts, and a pump base for mounting the two pump brackets. The bolts are hexagonal bolts of various specifications, and the surrounding side surfaces of the bolts are equipped with nuts.

[0017] The outer sides of the simulated pump are respectively installed with centering gaskets for adjusting the installation position of the simulated pump and square gaskets for centering the simulated pump. Several temporary pads are installed between the relative surfaces of the pump bracket and the pump base. It also includes a special lifting beam for lifting and shifting the simulated pump and pump bracket as a whole.

[0018] The beneficial effects of the present invention are:

[0019] The present invention has a novel design and is easy to manufacture, and the entire prefabrication process of the outlet pipe can be prefabricated under the horizontal platform in the workshop. Through the realization of the above-mentioned technical effects, on the one hand, the construction difficulty during the prefabrication of the tooling can be effectively reduced, and on the other hand, during the prefabrication operation, workers do not need to board the ship for a long time to enter the liquid cargo tank for construction and run back and forth, thereby effectively reducing the labor intensity of the construction personnel and improving the work efficiency of the construction personnel. Moreover, through the realization of the above-mentioned technical effects, the position of the relevant structural components can be flexibly operated, hoisted and adjusted when the liquid cargo pump outlet pipe is prefabricated, thereby effectively shortening the construction period during the prefabrication of the prefabricated tooling, improving the construction quality and construction efficiency, reducing the difficulty of operation, and increasing construction safety.

[0020] On the basis of the above technical solution, the present invention can also be improved as follows.

[0021] Furthermore, an outlet flange surface for positioning the outlet pipe flange of the liquid cargo pump is installed at the top of the simulated pump, and a group of circular holes a distributed in a circular array are opened inside the outlet flange surface. A positioning flange surface is installed on the circumferential side surface of the simulated pump, and a group of screw holes a distributed in a circular array are opened inside the positioning flange surface. The interior of the simulated pump is respectively provided with a number of regularly distributed lifting holes c and screw holes b, screw holes c and screw holes d for vertical lifting of the simulated pump.

[0022] Furthermore, a circular hole b is opened at the axial center position of the centering gasket, a boss a is fixedly provided on one side of the centering gasket and at a position corresponding to the periphery of the circular hole b, and two gaskets are symmetrically installed on the surface of the centering gasket.

[0023] Furthermore, the number of the temporary pads is N, the N temporary pads can be freely combined and have N thicknesses, and two symmetrically arranged open grooves are opened inside the temporary pad.

[0024] Furthermore, a long hole a is fixedly provided at the center of the square gasket, and a shoulder b is fixedly provided at a side surface of the square gasket corresponding to the periphery of the long hole a.

[0025] Furthermore, a number of regularly distributed circular holes c, hanging holes a and hanging holes b are respectively opened inside the special hanging beam, and the hanging holes b are located at the center of gravity of the assembly of the simulated pump and the two pump supports.

[0026] Furthermore, the inner top of the pump bracket is fixedly provided with an anti-plane that fits with the positioning flange surface, the inner side of the pump bracket is fixedly provided with an inner end surface, the bottom of the pump bracket is provided with a bottom surface for installing a temporary gasket, and the interior of the pump bracket is fixedly provided with a group of circular holes d distributed in a circular array and connected to the anti-plane, and the outer side of the pump bracket is respectively provided with a plurality of side square holes, a plurality of end square holes, a plurality of long holes a and a plurality of screw holes e for placing centering gaskets.

[0027] Furthermore, the pump base is provided with four regularly distributed upper planes for temporary pad installation, each of the upper planes is provided with two groups of circular holes d, and the pump tower upper structure is fixedly installed above the pump base.

[0028] A method for prefabricating a prefabricated tooling for a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower comprises the following steps:

[0029] SS001, manufacture all parts of the tooling according to the drawing, including: simulated pump, centering gasket, temporary spacer, square gasket, special hanging beam, bolt a, extension bolt, bolt b, bolt c, bolt d, bolt e, bolt f, nut a, nut b, nut c, nut d, and prepare two pump brackets;

[0030] SS002, first assemble the simulated pump and two pump brackets, tighten several bolts a so that the positioning flange surface of the simulated pump is aligned with the anti-plane of the pump bracket. Adjust the left and right center positions of the simulated pump and the lower end of the pump bracket by adjusting the four bolts b. After adjustment, tighten the four nuts a to lock the left and right center positions. Adjust the front and rear center positions of the simulated pump and the lower end of the pump bracket by adjusting the four bolts c and two bolts d. After adjustment, tighten the four nuts b and two nuts c to lock the front and rear center positions.

[0031] SS003, before the pump tower superstructure is installed, only the pump base is placed horizontally in the workshop. The simulated pump and pump bracket assembly is lifted vertically through the simulated pump lifting hole c and placed on the pump base. Eight bolts e are inserted through the circular holes b of the centering gasket, then through the screw holes e of the pump bracket, and finally through the circular holes d on the pump base.

[0032] SS004, screw the four bolts f into the corresponding screw holes e of the pump bracket. Use the instrument to measure and adjust the four bolts f to determine the distance between the bottom surface of the pump bracket and the upper plane of the pump tower base. Add temporary pads between the bottom and the upper plane. Add different thicknesses and different numbers of pads according to actual needs. Record the eight positions, and then remove the simulated pump and pump bracket combination.

[0033] SS005, the pump base and the pump tower superstructure are assembled, the pump tower is integrally formed and placed in a horizontal position;

[0034] SS006, remove the four bolts a from the assembly of the simulated pump and pump bracket, replace them with four extended bolts, pass the extended bolts through the circular holes c, then through the circular holes d in the pump bracket and tighten them into the screw holes a of the simulated pump. Install a dedicated lifting beam, and install a lifting device in the lifting hole b on the dedicated lifting beam to lift the simulated pump and two pump brackets assembly horizontally and move it to the installation location of the horizontally placed pump tower pump base.

[0035] SS007, in the horizontal position, eight bolts e are passed through the circular hole b of the centering washer, then through the screw hole e of the pump bracket, and then through the circular hole d on the pump base, screwing into the nut d. Based on the position records made in SS004, temporary spacers of different thicknesses and quantities are placed at eight locations between the bottom surface of the pump bracket and the upper plane of the pump base, and the eight bolts e and nuts d are tightened.

[0036] SS008, the outlet pipe is made according to the simulated pump outlet flange surface and the check valve flange surface, and the production is completed in the workshop;

[0037] SS009, remove the dummy pump and pump bracket assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a schematic diagram of the overall structure of a liquid cargo pump in the prior art;

[0039] Figure 2 This is a reference structural diagram of the conventional installation process of the liquid cargo pump of the present invention;

[0040] Figure 3 This is a structural schematic diagram of a tooling for prefabricating a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower according to the present invention;

[0041] Figure 4 For the present invention Figure 3 Schematic diagram of the top view structure;

[0042] Figure 5 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0043] Figure 6 This is a schematic structural diagram of the outlet flange surface and the hanging hole c of the present invention;

[0044] Figure 7 For the present invention Figure 6 A side structural diagram of

[0045] Figure 8 For the present invention Figure 7 Schematic diagram of the top view structure;

[0046] Figure 9 This is a schematic structural diagram of the centering gasket of the present invention;

[0047] Figure 10 Schematic diagram of the cross-sectional structure of the shoulder a of the present invention;

[0048] Figure 11 It is a structural schematic diagram of the temporary pad and the open groove of the present invention;

[0049] Figure 12 Schematic diagram of the structure of the square gasket and the long hole a of the present invention;

[0050] Figure 13 Schematic diagram of the cross-sectional structure of the shoulder b of the present invention;

[0051] Figure 14 This is a structural diagram of the special hanging beam of the present invention;

[0052] Figure 15 Schematic diagram of the structure of the circular hole c of the present invention;

[0053] Figure 16 It is a structural schematic diagram of the anti-plane and the pump bracket of the present invention;

[0054] Figure 17 This is a schematic structural diagram of the end square hole of the present invention;

[0055] Figure 18 Schematic diagram of the structure of the circular hole d of the present invention;

[0056] Figure 19 It is a structural schematic diagram of the pump base and the pump tower superstructure of the present invention;

[0057] Figure 20 for Figure 19 Schematic diagram of the top view structure;

[0058] Figure 21 This is a front view structural diagram of the simulated pump of the present invention;

[0059] Figure 22 This is a structural diagram of the extended bolt installed on the simulation pump;

[0060] Figure 23 This is a structural diagram of the simulated pump installed on the superstructure of the pump tower.

[0061] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0062] 10: Simulated pump, 11: Outlet flange surface, 12: Round hole a, 13: Positioning flange surface, 14: Screw hole a, 15: Hanging hole c, 16: Screw hole b, 17: Screw hole c, 18: Screw hole d

[0063] 20: Centering washer, 21: Round hole b, 22: Shoulder a

[0064] 30: Temporary pad, 31: Open slot

[0065] 40: Square washer, 41: Long hole a, 42: Shoulder b

[0066] 50: Special lifting beam, 51: Round hole c, 52: Lifting hole a, 53: Lifting hole b

[0067] 60: Pump bracket, 61: Anti-plane, 62: Inner end surface, 63: Bottom surface, 64: Circular hole d, 65: Side hole, 66: End hole, 67: Long hole a, 68: Screw hole e

[0068] 70: Pump base, 71: Upper plane, 72: Circular hole d, 73: Pump tower upper structure

[0069] 81: Bolt a, 82: Extension bolt, 83: Bolt b, 84: Bolt c, 85: Bolt d, 86: Bolt e, 87: Bolt f

[0070] 91: Nut a, 92: Nut b, 93: Nut c, 94: Nut d. DETAILED DESCRIPTION

[0071] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0072] The present invention provides the following preferred embodiments

[0073] like Figure 1-23 As shown, a tool for prefabricating a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower includes a simulated pump 10 for prefabricating the liquid cargo pump outlet pipe. The simulated pump 10 has the same specifications and model as a traditional liquid cargo pump.

[0074] The top of the simulated pump 10 is provided with an outlet flange surface 11 for positioning the flange of the liquid cargo pump outlet pipe. A group of circular holes a12 are formed in a circumferential array within the outlet flange surface 11. A positioning flange surface 13 is provided on the circumferential side of the simulated pump 10. A group of screw holes a14 are formed in a circumferential array within the positioning flange surface 13. The simulated pump 10 is also provided with a number of regularly distributed lifting holes c15, screw holes b16, screw holes c17, and screw holes d18 for vertically lifting the simulated pump 10.

[0075] Two pump brackets 60 for mounting the simulated pump 10 and equipped with a plurality of bolts, and a pump base 70 for mounting the two pump brackets 60. The bolts are hexagonal bolts of various specifications, and nuts are provided on the sides of the bolts;

[0076] The above components can be equipped with hexagonal bolts and nuts of various specifications to facilitate the advance production of the outlet pipe of the cryogenic liquid cargo pump of the pump tower, effectively shortening the construction period and improving the construction quality;

[0077] The pump bracket 60 is a component provided with the liquid cargo system;

[0078] See also Figure 16 、 Figure 3 、 Figure 4 and Figure 5As shown, the inner top of the pump bracket 60 is fixedly provided with a counter-plane 61 that fits with the positioning flange surface 13. During installation, the positioning flange surface 13 on the simulated pump 10 contacts and fits with the counter-plane 61 on the pump bracket 60, and then the connection and fixing operation between the simulated pump 10 and the pump bracket 60 is performed;

[0079] See also Figure 3 A plurality of temporary pads 30 are installed between the opposing surfaces of the pump bracket 60 and the pump base 70. The number of the temporary pads 30 is N. The N temporary pads 30 can be freely combined and have N thicknesses. Two symmetrically arranged opening grooves 31 are opened inside the temporary pads 30.

[0080] The inner side of the pump bracket 60 is fixed with an inner end surface 62, and the bolt d85 is screwed onto the nut c93 and screwed into the screw hole d18 in the simulation pump 10, and the head of the bolt d85 is against the inner end surface 62;

[0081] The bottom of the pump bracket 60 is provided with a bottom surface 63 for installing the temporary gasket 30. The interior of the pump bracket 60 is fixed with a group of circular holes d64 distributed in a circumferential array and connected to the counter plane 64.

[0082] See also Figure 3-5 As shown, during the installation operation, the bolt a81 passes through the circular hole d64 of the pump bracket 60 and is screwed into the screw hole a14 of the simulated pump 10, thereby facilitating the connection and fixing operation between the pump bracket 60 and the simulated pump 10;

[0083] The outer side of the pump bracket 60 is respectively provided with a plurality of side holes 65, a plurality of end square holes 66, a plurality of long holes a67 and a plurality of screw holes e68 for placing the centering gasket 20;

[0084] The side square holes 65 and the end square holes 66 were originally used to install shock-absorbing blocks, but are now used in conjunction with bolts, nuts and square washers 40 to adjust the centering of the simulated pump 10 and the pump bracket 60;

[0085] See also Figure 3-5 As shown, a centering gasket 20 for adjusting the installation position of the simulated pump 10 and a square gasket 40 for centering the simulated pump 10 are respectively installed on the outside of the simulated pump 10;

[0086] See also Figure 3 、 Figure 9 、 Figure 10 As shown, a circular hole b21 is opened at the axis position of the centering gasket 20, and a shoulder a22 is fixedly provided on one side of the centering gasket 20 and corresponding to the position outside the circular hole b22. Two gaskets are symmetrically installed on the surface of the centering gasket 20, and the two gaskets play an auxiliary support and buffering role. The gaskets are semicircular structures;

[0087] The centering washer 20 is placed on the screw hole e68 of the pump bracket 60. The shoulder a22 on one side of the centering washer 20 is embedded in the screw hole e68 of the pump bracket 60. The bolt f87 is screwed into the screw hole e68 to complete the connection and fixation between the centering washer 20 and the pump bracket 60.

[0088] Bolt e86 passes through the circular hole b21 of the centering washer 20, then through the screw hole e68 of the pump bracket 60, then through the open slot 31 of the temporary spacer 30, and then through the circular hole d72 on the pump base 70, and screws into the nut d94;

[0089] By setting the above connection state, the temporary spacer 30 is installed and fixed between the pump bracket 60 and the pump bracket 60;

[0090] See also Figure 3 、 Figure 12 and Figure 13 As shown, a long hole a41 is fixedly opened at the center of the square gasket 40, and a shoulder b42 is fixedly provided on one side of the square gasket 40 at a position corresponding to the periphery of the long hole a41;

[0091] During installation, bolt b83 is passed through the long hole a41 of the square washer 40 and then through the side hole 65 of the pump bracket 60. Then, nut a91 is screwed onto bolt b83 and then screwed into screw hole b16. Bolt c84 is passed through the long hole a41 of the other washer 40 and then through the end square hole 66 of the pump bracket 60 and then screwed into screw hole c17. Then, nut b92 is screwed on. Bolt c84 is screwed onto nut c93 and then screwed into screw hole d18.

[0092] The shoulder 42 on the square gasket 40 is embedded in the side square hole 65 or the end square hole 66 of the pump bracket 60;

[0093] See also Figure 3-Figure 5 、 Figure 14 and Figure 15 As shown, a special lifting beam 50 is also included for simulating the overall lifting and displacement of the pump 10 and the pump bracket 60.

[0094] The interior of the dedicated lifting beam 50 is provided with a number of regularly distributed circular holes c51, lifting holes a52, and lifting holes b53. The lifting holes b53 are located at the center of gravity of the assembly of the simulated pump 10 and the two pump brackets 60. The lifting holes b53 can be used to lift the assembly in a balanced manner during horizontal installation. The lifting holes a52 are auxiliary lifting holes.

[0095] The lengthened bolt 82 passes through the circular hole c51, then through the circular hole d64 of the pump bracket 60 and screws into the screw hole a14 of the dummy pump 10, thereby completing the installation of the dedicated hanging beam 50 on the pump bracket 60;

[0096] The pump base 70 is internally provided with four regularly distributed upper planes 71 for installing temporary pads 30 , and each upper plane 71 is internally provided with two groups of circular holes d72 . A pump tower upper structure 73 is fixedly installed above the pump base 70 .

[0097] A method for prefabricating a prefabricated tooling for a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower comprises the following steps:

[0098] SS001, manufacture various tooling components according to the drawing, including: simulated pump 10, centering gasket 20, temporary spacer 30, square gasket 40, special hanging beam 50, equipped with bolts a81, extended bolts 82, bolts b83, bolts c84, bolts d85, bolts e86, bolts f87, nuts a91, nuts b92, nuts c93, nuts d94, and prepare two pump brackets 60. Bolts a81, extended bolts 82, bolts b83, bolts c84, bolts d85, bolts e86, bolts f87, nuts a91, nuts b92, nuts c93, nuts d94 are all prefabricated hexagonal bolts. The hexagonal bolts and nuts can facilitate the early production of the outlet pipe of the cryogenic liquid cargo pump of the pump tower, effectively shortening the construction period and improving the construction quality.

[0099] The two pump brackets 60 are components provided by the liquid cargo system;

[0100] SS002, first assemble the simulated pump 10 and the two pump brackets 60, tighten several bolts a81 so that the positioning flange surface 13 of the simulated pump 10 is aligned with the anti-plane surface 61 of the pump bracket 60, adjust the left and right center positions of the simulated pump 10 and the lower end of the pump bracket 60 by adjusting the four bolts b83, and then tighten the four nuts a91 to lock the left and right center positions. Adjust the front and rear center positions of the simulated pump 10 and the lower end of the pump bracket 60 by adjusting the four bolts c84 and two bolts d85, and then tighten the four nuts b92 and two nuts c93 to lock the front and rear center positions. Through the above adjustment operations, the simulated pump 10 is accurately installed and precisely positioned on the two pump brackets 60.

[0101] SS003, before the pump tower superstructure 73 is installed, only the pump base 70 is placed horizontally in the workshop. The simulated pump 10 and pump bracket 60 are lifted vertically through the lifting hole c15 of the simulated pump 10 and placed on the pump base 70. Eight bolts e86 are inserted through the circular holes b21 of the centering gasket 20, then through the screw holes e68 of the pump bracket 60, and finally through the circular holes d72 on the pump base 70. This completes the preliminary installation and positioning of the simulated pump 10 and pump bracket 60 on the pump base 70.

[0102] SS004, screw the four bolts f87 into the corresponding screw holes e68 of the pump bracket 60. Use the instrument to measure and adjust the four bolts f87 to determine the distance between the bottom surface 63 of the pump bracket 60 and the upper plane 71 of the pump tower base. Add temporary spacers 30 between the bottom surface 63 and the upper plane 71. Add different thicknesses and different numbers of spacers as needed. Record the eight positions. Then remove the simulated pump 10 and pump bracket 60 combination.

[0103] SS005, the pump base 70 is assembled with the pump tower superstructure 73, and the pump tower is integrally formed and placed in a horizontal position;

[0104] SS006. Remove the four bolts a81 from the assembly of the simulated pump 10 and pump bracket 60 and replace them with four extended bolts 82. Pass the extended bolts 82 through the circular holes c51, then through the circular holes d64 of the pump bracket 60 and tighten them into the screw holes a14 of the simulated pump 10. Install the dedicated lifting beam 50 and install a lifting device in the lifting holes b53 on the dedicated lifting beam 50. Lift the assembly of the simulated pump 10 and the two pump brackets 60 horizontally and move it to the installation location on the horizontally placed pump tower pump base 70.

[0105] SS007, in the horizontal position, eight bolts e86 are passed through the circular holes b21 of the centering washer 20, then through the screw holes e68 of the pump bracket 60, and then through the circular holes d72 on the pump base 70, screwing into the nuts d94. Based on the position records made in SS004, temporary spacers 30 of varying thicknesses and quantities are placed at eight locations between the bottom surface 63 of the pump bracket 60 and the upper surface 71 of the pump base 70. The eight bolts e86 and nuts d94 are tightened.

[0106] SS008, based on the layout of the outlet flange surface 11 of the simulated pump 10 and the flange surface of the check valve, the outlet pipe is manufactured in the workshop;

[0107] SS009, remove the simulation pump 10 and pump bracket 60 assembly.

[0108] In summary: The beneficial effects of the present invention are specifically reflected in the novel design, easy production, and the entire prefabrication process of the outlet pipe can be prefabricated under the workshop horizontal platform. Through the realization of the above technical effects, on the one hand, the construction difficulty during the prefabrication of the tooling can be effectively reduced. On the other hand, during the prefabrication operation, workers do not need to board the ship for a long time to enter the liquid cargo tank for construction and run back and forth, which can effectively reduce the labor intensity of the construction workers and improve the work efficiency of the construction workers.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for prefabricating a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower, comprising a simulated pump (10) for prefabricating the liquid cargo pump outlet pipe, two pump brackets (60) for mounting the simulated pump (10) and equipped with a plurality of bolts, and a pump base (70) for mounting the two pump brackets (60), wherein the peripheral side surfaces of the bolts are equipped with nuts, and characterized in that: The outer side of the simulated pump (10) is respectively installed with a centering gasket (20) for adjusting the installation position of the simulated pump (10) and a square gasket (40) for centering the simulated pump (10), a plurality of temporary pads (30) are installed between the relative surfaces of the pump bracket (60) and the pump base (70), and a special hanging beam (50) is also included for hoisting and shifting the simulated pump (10) and the pump bracket (60) as a whole. The top of the simulated pump (10) is provided with an outlet flange surface (11) for positioning the outlet flange of the liquid cargo pump, and a group of circular holes a (12) distributed in a circumferential array are opened inside the outlet flange surface (11). The peripheral side of the simulated pump (10) is provided with a positioning flange surface (13), and a group of screw holes a (14) distributed in a circumferential array are opened inside the positioning flange surface (13). The interior of the simulated pump (10) is respectively provided with a plurality of regularly distributed hanging holes c (15) and screw holes b ( 16), screw hole c (17) and screw hole d (18), a circular hole b (21) is opened at the axis position of the centering gasket (20), a boss a (22) is fixedly provided on one side of the centering gasket (20) and at a position corresponding to the periphery of the circular hole b (21), two gaskets are symmetrically installed on the surface of the centering gasket (20), an anti-plane (61) that fits the positioning flange surface (13) is fixedly provided on the inner top of the pump bracket (60), and the inner side of the pump bracket (60) is fixed An inner end surface (62) is provided, and a bottom surface (63) for installing a temporary pad (30) is provided at the bottom of the pump bracket (60). A group of circular holes d (64) distributed in a circumferential array and connected to the anti-plane (61) are fixedly opened inside the pump bracket (60), and a plurality of side holes (65), a plurality of end holes (66), a plurality of long holes a (67) and a plurality of screw holes e (68) for placing the centering gasket (20) are respectively provided on the outside of the pump bracket (60).

2. The tooling for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower according to claim 1 is characterized in that: The number of the temporary pads (30) is N, and the N temporary pads (30) can be freely combined and have N thicknesses. Two symmetrically arranged opening slots (31) are provided inside the temporary pads (30).

3. The tooling for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower according to claim 1 is characterized in that: A long hole a (41) is fixedly provided at the center of the square gasket (40), and a shoulder b (42) is fixedly provided on one side of the square gasket (40) at a position corresponding to the periphery of the long hole a (41).

4. The tooling for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower according to claim 1 is characterized in that: The interior of the special hanging beam (50) is respectively provided with a plurality of regularly distributed circular holes c (51), hanging holes a (52) and hanging holes b (53), and the hanging holes b (53) are located at the center of gravity of the assembly of the simulated pump (10) and the two pump brackets (60).

5. The tooling for prefabricating the outlet pipe of a cryogenic liquid cargo pump of an LNG ship pump tower according to claim 1 is characterized in that: The pump base (70) is provided with four regularly distributed upper planes (71) for installing temporary pads (30), each of the upper planes (71) is provided with two groups of circular holes d (72), and a pump tower upper structure (73) is fixedly installed above the pump base (70).

6. A method for prefabricating a tool for prefabricating a cryogenic liquid cargo pump outlet pipe of an LNG ship pump tower according to any one of claims 1 to 5, characterized in that: The following steps are involved: SS001, make the various parts of the tooling according to the drawing, including: simulated pump (10), centering gasket (20), temporary gasket (30), square gasket (40), special hanging beam (50), equipped with bolt a (81), extended bolt (82), bolt b (83), bolt c (84), bolt d (85), bolt e (86), bolt f (87), nut a (91), nut b (92), nut c (93), nut d (94), and prepare two pump brackets (60); SS002, first assemble the simulation pump (10) and the two pump brackets (60), tighten several bolts a (81) so that the positioning flange surface (13) of the simulation pump (10) fits with the anti-plane surface (61) of the pump bracket (60), and adjust the left and right center positions of the simulation pump (10) and the lower end of the pump bracket (60) by adjusting the four bolts b (83). After adjustment, tighten the four nuts a (91) to lock the left and right center positions. Adjust the front and rear center positions of the simulation pump (10) and the lower end of the pump bracket (60) by adjusting the four bolts c (84) and the two bolts d (85). After adjustment, tighten the four nuts b (92) and the two nuts c (93) to lock the front and rear center positions. SS003, before the pump tower superstructure (73) is installed, only the pump base (70) is placed horizontally in the workshop. The assembly of the simulated pump (10) and the pump bracket (60) is lifted vertically through the lifting hole c (15) of the simulated pump (10) and placed on the pump base (70). Eight bolts e (86) are passed through the circular hole b (21) of the centering gasket (20), then through the screw hole e (68) of the pump bracket (60), and then through the circular hole d (72) on the pump base (70); SS004, four bolts f (87) are screwed into the corresponding screw holes e (68) of the pump bracket (60), and the four bolts f (87) are adjusted by measuring with an instrument to determine the distance between the bottom surface (63) of the pump bracket (60) and the upper plane (71) of the pump tower base. A temporary pad (30) is added between the bottom surface (63) and the upper plane (71). Different thicknesses and different numbers of pads are added according to actual needs. The eight positions are recorded, and then the assembly of the simulated pump (10) and the pump bracket (60) is removed; SS005, the pump base (70) is assembled with the pump tower upper structure (73), and the pump tower is integrally formed and placed in a horizontal position; SS006, remove the four bolts a (81) of the assembly of the simulated pump (10) and the pump bracket (60), replace them with four lengthened bolts (82), and tighten the lengthened bolts (82) through the circular hole c (51), then through the circular hole d (64) of the pump bracket (60) and the screw hole a (14) of the simulated pump (10), install the special hanging beam (50), install the lifting device in the lifting hole b (53) on the special hanging beam (50), and lift the assembly of the simulated pump (10) and the two pump brackets (60) horizontally, and move it to the installation position of the pump base (70) of the horizontally placed pump tower; SS007, in the horizontal state, eight bolts e (86) pass through the circular hole b (21) of the centering washer (20), then through the screw hole e (68) of the pump bracket (60), and then through the circular hole d (72) on the pump base (70), and screw together with the nut d (94). According to the position record made in step SS004, temporary spacers (30) of different thicknesses and different numbers are placed at eight positions between the bottom surface (63) of the pump bracket (60) and the upper surface (71) of the pump base (70), and the eight bolts e (86) and nuts d (94) are tightened. SS008, the outlet pipe is made according to the outlet flange surface (11) of the simulated pump (10) and the flange surface of the check valve, and the production is completed in the workshop; SS009, remove the dummy pump (10) and pump bracket (60) assembly.

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