A method for hoisting a booster pump on an LNG regasification ship

Abstract

The application discloses a kind of LNG re-gasification ship booster pump's real ship hoisting method, hoist FSRU re-gasification ship booster pump using crane, method includes the following steps: adjusting ballast water, inspection balance;Confirm hoisting trajectory to coincide with the top and bottom of pump well line;Adjust the center of gravity of gourd sling and the center of object coincide;Slowly hoist booster pump with 1# crane to make it enter pump well;Tighten the bolt and nut of top plate and seat table connection.The application has achieved the following beneficial effects through practical application: (1) the tooling tool is less, and the booster pump is hoisted easily;(2) strong, can hoist the equipment with precision surface for the first contact surface during hoisting;(3) lower than traditional hoisting cost.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding and specifically relates to a method for hoisting a booster pump for an LNG regasification vessel. Technical Background

[0002] During shipbuilding, hoisting is a crucial aspect of the construction process. Traditional hoisting methods typically involve the following steps: 1. Evenly distribute lifting rings on the pump top plate, connect them with straps, and then secure the straps tightly to the crane hook, keeping the straps slack. 2. For accurate hoisting, guide pins are usually installed or two channel steel sections are welded together to act as guide rails. 3. Hoisting is performed using a crane. 4. Tighten the bolts and nuts connecting the top plate to the base.

[0003] As described, traditional hoisting methods place great emphasis on the regularity of the object's shape, requiring the initial contact surface to be a non-precision surface. If the object's shape is not relatively regular, or if the initial contact surface is a precision surface, using hoisting guide pins or channel steel rails can easily damage the object and the pump, affecting its subsequent use. The booster pump mentioned in this article is an example of this. Furthermore, compared to the hoisting method proposed in this article, traditional methods require significant manpower and resources, as well as advance preparation of hoisting guide pins and channel steel rails, increasing costs. Additionally, booster pumps are not recommended for long-term installation; they are typically installed during mooring trials after sea trials, increasing installation difficulty.

[0004] Therefore, traditional hoisting methods present several problems when installing booster pumps: 1. The first contact surface of the booster pump during hoisting is a precision surface, which is very fragile. Traditional hoisting methods can easily damage the booster pump, affecting its subsequent use. 2. Traditional hoisting methods are more expensive. 3. Booster pumps are generally installed during mooring trials after sea trials. At this time, the ship is already docked, and the interference of seawater greatly increases the difficulty of using traditional hoisting methods on board. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for the actual shipboard installation of a booster pump for LNG regasification. This method aims to safely and smoothly install the booster pump without using positioning channel steel and lifting guide pins, and to avoid damage to the initial contact surface and installation interference.

[0006] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:

[0007] A method for hoisting a booster pump on an LNG regasification vessel, wherein the booster pump is installed in the pump well of the LNG regasification vessel, and the method mainly includes the following steps:

[0008] Step 1: Adjust the ballast water according to the seawater conditions at the dock on the day so that the LNG regasification vessel can dock at the dock more smoothly and check its balance to ensure that it is in a balanced state.

[0009] Step 2: Confirm the predetermined hoisting trajectory on site, and at the same time determine the extension line of the line connecting the top and bottom of the pump well. Adjust the hoisting trajectory of the booster pump to make it parallel to the extension line.

[0010] Step 3: Install four lifting rings evenly on the booster pump and connect them to the hoist. At the same time, fix four lasers evenly on the outer ring. Then, connect the four straps to the hoist and tie them tightly to the hook of crane #1. Adjust the hoist so that the center of gravity of the hoist coincides with the center of the booster pump to ensure that the booster pump will not tilt when it is lifted by the crane.

[0011] Step 4: Ensure that the hoisting process follows the trajectory line. The center line of the pump well and the center line of the booster pump should be aligned to coordinate with the No. 1 crane to slowly hoist the booster pump into the pump well. When entering the pump well, observe at all times to ensure that the pump well wall does not touch the surrounding area of ​​the booster pump.

[0012] Step 5. Confirm that the booster pump has been hoisted to the installation position and tighten the bolts and nuts connecting the top plate and the base to realize the actual ship hoisting of the booster pump on the LNG regasification vessel.

[0013] When hoisting the booster pump, the positioning channel steel and hoisting guide pin are eliminated, and the safe hoisting of the booster pump is achieved by aligning the trajectory lines.

[0014] In step 3, a hoist is used to adjust the center of gravity to coincide with the center, thereby preventing the booster pump from tilting excessively during hoisting, which fully ensures the safety of personnel and equipment and the subsequent use of equipment.

[0015] In step 4, the "three lines in one" process ensures that the hoisting trajectory line and the center line of the pump well coincide. This is achieved by adjusting the position of the crane and the movement of the boom to ensure that the hook can move vertically up and down from the center of the pump well opening. This will allow the hoisting trajectory line to coincide with the center line of the pump well.

[0016] The alignment of the pump well centerline and the booster pump centerline is achieved by projecting lasers emitted from four lasers onto the edge of the pump well, then connecting the four laser points on the pump well edge. The intersection of the lines drawn from these laser points (the laser intersection point in the diagram below) is precisely on the pump well centerline, coinciding with the center of the pump well opening. If there is any deviation, the tilt of the booster pump can be controlled by adjusting the hoist until the laser intersection point coincides with the center of the pump well opening. This ensures that the hoisting trajectory line and the pump well centerline coincide, and vice versa, thus ensuring that the hoisting trajectory line, the pump well centerline, and the booster pump centerline are aligned.

[0017] The first contact surface of the booster pump is a tight surface, and other similar tight-surfaced components can also be installed using this hoisting method.

[0018] Based on the above technical solution, the shipboard hoisting method for the LNG regasification shipboard booster pump of the present invention has achieved the following beneficial effects through practical application:

[0019] 1. The method for lifting the booster pump on a real ship according to the present invention eliminates the positioning channel steel and lifting guide pin during the lifting of the booster pump, and achieves safe lifting of the booster pump by coinciding with the trajectory line. It uses fewer tools and is simple to lift the booster pump.

[0020] 2. The method for lifting the booster pump on a ship according to the present invention is highly targeted and can be used for equipment where the first contact surface during lifting is a precision surface. This method can effectively protect the pump and equipment without affecting their subsequent use.

[0021] 3. The actual ship hoisting method of the booster pump of the present invention saves hoisting costs. It not only eliminates the need to rely on hoisting guide pins and guide rails for positioning, but also allows for the recycling of lasers. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an actual LNG regasification ship booster pump.

[0024] Figure 2 This diagram illustrates the arrangement of the lifting ring straps at the top plate of the booster pump, ensuring the three lines are aligned for lifting.

[0025] Figure 3 This is a simplified schematic diagram of the LNG regasification shipboard pump well. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention relates to a method for the actual shipboard installation of a booster pump on an LNG regasification vessel. The booster pump is installed in the pump well of the LNG regasification vessel. The actual shipboard installation method mainly includes the following steps:

[0028] Step 1: Adjust the ballast water according to the seawater conditions at the dock on the day so that the LNG regasification vessel can dock at the dock more smoothly and check its balance to ensure that it is in a balanced state.

[0029] Step 2: Confirm the predetermined hoisting trajectory on site, and at the same time determine the extension line of the line connecting the top and bottom of the pump well. Adjust the hoisting trajectory of the booster pump to make it parallel to the extension line.

[0030] Step 3: Evenly install four lifting rings on the booster pump and connect them to hoists. Simultaneously, evenly fix four lasers on the outer ring. Then, connect four straps to the hoists and secure them tightly to the hook of crane #1. Adjust the hoists so that their center of gravity coincides with the center of the booster pump to ensure that the booster pump will not tilt during hoisting. The use of hoists to adjust the center of gravity to coincide with the center prevents excessive tilting of the booster pump during hoisting, fully ensuring the safety of personnel and equipment and the subsequent use of the equipment.

[0031] Step 4: Ensure the hoisting process follows the trajectory line, aligning the centerline of the pump well and the centerline of the booster pump. The No. 1 crane should then slowly hoist the booster pump into the pump well. During entry, constant monitoring is crucial to ensure the pump well wall does not touch the pump's perimeter. This alignment is achieved by adjusting the crane position and boom movement to ensure the hook moves vertically up and down from the center of the pump well opening. The alignment of the pump well centerline and the booster pump centerline is achieved by projecting laser beams from four lasers onto the edge of the pump well, connecting the laser points at the four edges, and then finding the intersection of the lines drawn from these lines. Figure 3The laser convergence point is precisely located on the centerline of the pump well, coinciding with the center of the pump well opening. Any deviation can be controlled by adjusting the hoist to adjust the tilt of the booster pump until the laser convergence point aligns with the center of the pump well opening. This ensures that the hoisting trajectory line coincides with the centerline of the pump well, and vice versa, thus ensuring the alignment of the hoisting trajectory line, the pump well centerline, and the booster pump centerline – a true convergence of the three lines.

[0032] Step 5. Confirm that the booster pump has been hoisted to the installation position and tighten the bolts and nuts connecting the top plate and the base to realize the actual ship hoisting of the booster pump on the LNG regasification vessel.

[0033] Example 1

[0034] Figure 1 This image shows the complete state of booster pump 1 inside the tank on an LNG regasification vessel. Booster pump 1 is approximately 5 meters long and 1 meter in diameter. Figure 2 and Figure 3 As shown, the hoisting process in this embodiment is as follows:

[0035] 1. The night before the hoisting, the ballast water is calculated and adjusted according to the sea conditions the next day. This is to adjust the centerline of the pump well so that it is relatively vertical. Adjusting the ballast water further stabilizes the ship and keeps the centerline of the pump well stable.

[0036] 2. Install four lifting rings evenly distributed on the top plate of the booster pump and connect them to hoist 2. At the same time, fix four laser emitters 3 evenly on the outermost ring. Connect hoist 2 to crane #1 and tie it tightly to the hook of crane #1, keeping the straps loose. Then lift the booster pump lying flat on the dock with the crane so that booster pump 1 is in a vertical position.

[0037] 3. Plan the hoisting trajectory carefully to ensure that the hoisting trajectory coincides with the extended line connecting the top and bottom of the pump well, i.e., the center line of the pump well, to further reduce the possibility of collision.

[0038] 4. During the hoisting process, because the center of gravity of the booster pump is difficult to control, a hoist is used to adjust the four directions of the booster pump to ensure that its center of gravity coincides with the center and the hoisting trajectory line, thus preventing the booster pump from tilting excessively during hoisting. Using four laser emitters, we can easily determine whether the centerline of the booster pump and the hoisting trajectory line coincide with the centerline of the pump well. Specifically, the points where the laser beams strike are diagonally connected, and the intersection point is observed to roughly coincide with the center of the pump well opening. This series of steps protects the vulnerable pump body of the booster pump and reduces damage.

[0039] 5. Slowly lower the booster pump into the pump well, adjust its direction, and simultaneously tighten the top plate and base with bolts, nuts, and other fasteners.

[0040] To better demonstrate the innovative advantages of this invention, we have made a tabular comparison between the prior art and the patent of this invention, as shown in Tables 1-1 and 1-2 below.

[0041] Table 1-1 Traditional Lifting Methods

[0042]

[0043]

[0044] Table 1-2 A method for the actual shipboard installation of a booster pump for LNG regasification.

[0045]

[0046] As can be seen from the comparison in Tables 1-1 and 1-2 above, the booster pump actual ship lifting method of the present invention has the following advantages compared with the traditional lifting method:

[0047] 1. Highly applicable scope. This method is designed for equipment where the first contact surface during lifting is a precision surface. It is applicable not only to the lifting of specific equipment on LNG regasification vessels, but also to the lifting of special equipment on other vessels.

[0048] 2. Cost savings. The system eliminates the need for hoisting guide pins and guide rails, reducing reliance on such equipment. Furthermore, the laser can be reused, reducing manpower and material costs and lowering expenses.

[0049] 3. Flexible and adaptable hoisting methods. By designing hoisting trajectories and adjusting hoists, damage to hoisting equipment can be avoided, ensuring the normal operation of subsequent equipment.

Claims

1. A method for onboard hoisting of a booster pump on an LNG regasification vessel, wherein the booster pump is installed in the pump well of the LNG regasification vessel, characterized in that... During the hoisting of the booster pump, the positioning channel steel and hoisting guide pins are eliminated. The safe hoisting of the booster pump is achieved by ensuring the coincidence of the trajectory lines. This shipboard hoisting method mainly includes the following steps: Step 1: Adjust the ballast water according to the seawater conditions at the dock on the day so that the LNG regasification vessel can dock at the dock more smoothly and check its balance to ensure that it is in a balanced state. Step 2: Confirm the predetermined hoisting trajectory on site, and at the same time determine the extension line of the line connecting the top and bottom of the pump well. Adjust the hoisting trajectory of the booster pump to make it parallel to the extension line. Step 3: Install multiple lifting rings evenly on the booster pump and connect them to the hoist. At the same time, fix multiple lasers evenly on the outer ring. Then, connect multiple straps to the hoist and tie them tightly to the hook of crane #1. Adjust the hoist so that the center of gravity of the hoist coincides with the center of the booster pump to ensure that the booster pump will not tilt when it is lifted by the crane. Step 4: Ensure the hoisting process follows the trajectory line. The center line of the pump well and the center line of the booster pump should be aligned to coordinate with the No. 1 crane to slowly hoist the booster pump into the pump well. During entry, constant observation is necessary to ensure the pump well wall does not touch the booster pump's perimeter. During the hoisting process, follow the planned hoisting trajectory and utilize four lasers to achieve stable hoisting and alignment of the three lines. The alignment of the three lines refers to the fact that the trajectory of the hoisting ring during the hoisting process, the extension of the line connecting the bottom of the pump well and the center of the pump well opening, forming the center line of the pump well, and the center line of the booster pump itself are all on a straight line. The alignment of the pump well center line and the center of the booster pump is achieved by projecting the lasers emitted by the four lasers onto the edge of the pump well and connecting the laser points on the four pump well edges, so that the intersection of the lines is exactly on the center line of the pump well, that is, coincides with the center of the pump well opening. Step 5. Confirm that the booster pump has been hoisted to the installation position and tighten the bolts and nuts connecting the top plate and the base to realize the actual ship hoisting of the booster pump on the LNG regasification vessel.

2. The method for actual shipboard hoisting of an LNG regasification shipboard booster pump according to claim 1, characterized in that, In step 3, a hoist is used to adjust its center of gravity to coincide with the center, so as to avoid excessive tilting of the booster pump during the hoisting process.

3. The method for actual shipboard hoisting of an LNG regasification shipboard booster pump according to claim 1, characterized in that, The first contact surface of the booster pump is the tight surface.

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