A method for installing and inspecting a riser suspension device

Abstract

The present invention relates to the field of ship technology, and in particular to a method for inspecting the installation of a riser suspension device, comprising a riser body, wherein the riser body is placed on a horizontal plane, and a line is drawn from top to bottom on the outer side of the riser body by a rotating laser leveler, and four measuring points are marked on the bottom of the riser body. Then, according to a theoretically calculated value, a theoretical value height is marked on the outer side of the riser body. Then, the riser body is hoisted to an installation position by a telescopic boom or a sling, and the riser body is lowered into water section by section, and the speed is controlled to ensure safe entry into the water. First, the direction and height between the riser body and a mounting piece are adjusted, and then the riser body is rotated according to a rotation center point until a positioning point coincides with a measuring point. After the riser body is welded and installed, a total station is used to measure a distance from a measuring point at the bottom end of the riser body to a lower bottom surface of the mounting piece, and an actual deviation angle of a center line of the riser body is calculated, and the installed riser body is inspected.

Description

Technical Field

[0001] The present invention relates to the field of ship technology, and in particular to a method for inspecting the installation of a riser suspension device. Background Art

[0002] In a floating production storage and offloading vessel, the floating production storage and offloading riser body needs to be suspended on one side of the ship's side. Floating production storage and offloading mainly involves riser suspension of the riser body, so high precision requirements are placed on its installation, which is mainly reflected in the fact that such riser body needs to form a certain angle with the vertical direction of one side of the ship's side to facilitate oil unloading. In addition, there are many such riser bodies, and the angle requirements for each riser body are different, so the installation and inspection of the riser suspension equipment need to be carried out.

[0003] In the prior art, for example, a patent with publication number CN117569756B discloses a production and transportation riser suspension system for a floating oil production platform, which includes a suspension structure, a locking mounting member and a clamping mounting member. A flange is provided on the top of the suspension structure, and a plurality of penetrating mounting grooves are provided in the middle of the suspension structure. The locking mounting member includes a main body, which is installed in the mounting grooves. A locking arc plate is fixedly connected to the inner side of the main body. A driving cavity is provided inside the main body, and a telescopic cavity connected to the driving cavity is provided in the locking arc plate.

[0004] The above structure can quickly position the riser through the cooperation of the magnetic protrusion and the magnetic plate. However, during the installation of the riser suspension body, since it needs to be installed at an angle, it cannot be accurately positioned during the installation process and the riser suspension body cannot be inspected after the installation is completed, resulting in low equipment installation and inspection efficiency. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a method for installing and inspecting riser suspension equipment to solve the problems of being unable to accurately position the riser suspension body during installation and being unable to inspect the riser suspension body after installation, resulting in low equipment installation and inspection efficiency.

[0006] Based on the above purpose, the present invention provides a method for installing and inspecting a riser suspension device, comprising a riser body, a mounting member is arranged outside the riser body, the riser is arranged obliquely, and the mounting member is fixedly installed on one side of the ship's side, and further comprising the following steps:

[0007] First, through theoretical calculation, calculate the height values ​​of the four positioning points that need to be flush with the mounting parts when the riser body is installed, determine a plane based on the four points, and then place the riser body on the horizontal plane;

[0008] By using a rotating laser leveler to mark lines from top to bottom on the outside of the riser body, four measuring points are marked on the bottom of the riser body, and then the theoretical height is marked on the outside of the riser body according to the theoretically calculated value;

[0009] Next, determine the height point at the external height position of the riser body and mark it with paint, determine the rotation center point at the height point of the riser body, and mark the positioning point on the upper surface of the mounting piece;

[0010] Then, lift the riser body to the installation location by telescopic boom or sling, lower the riser body into the water section by section, control the speed, and ensure safe entry into the water. First, adjust the direction and height between the riser body and the mounting part, and then rotate the riser body according to the rotation center point until the positioning point coincides with the measurement point;

[0011] After determining the welding position, inspect the riser and weld the riser body to the mounting parts, keeping the welding position at the water level;

[0012] After the riser body is welded and installed, the distance from the measuring point at the bottom of the riser body to the bottom surface of the mounting part is measured by a total station, the actual deviation angle of the center line of the riser body is calculated, and the installed riser body is inspected.

[0013] Preferably, the positioning points are 19°, 109°, 199°, and 289°, respectively, and the measuring points are 0°, 90°, 180°, and 360°, respectively.

[0014] Preferably, the height of the rotation center point is 3163 mm.

[0015] Preferably, the riser inspection includes aligning the marks on the outer surface of the riser body with the marks on the upper surface of the mounting piece one by one, and then using a level to perform a final correction to ensure the inclination angle of the riser body.

[0016] Preferably, after the riser is inspected, a fixing device may be used to fasten the riser body to the mounting member, and various methods such as anchoring, ropes, and a base may be used.

[0017] Preferably, the distances from the four groups of marking points at the bottom end of the riser body to the bottom surface of the mounting member are line segment a, line segment b, line segment c and line segment d respectively, and the values ​​of line segment c and line segment d are used to check whether the riser body is flush in the left and right directions.

[0018] Preferably, the deviation angle of the centerline of the riser body is calculated as follows:

[0019] Short side A = length of line segment a minus length of line segment b;

[0020] Long side B = length between the vertex of line segment a and the vertex of line segment b;

[0021] Hypotenuse C = riser body diameter;

[0022] The deviation angle of the center line of the riser body can be obtained by the three side lengths according to the cosine theorem.

[0023] Beneficial effects of the present invention:

[0024] By marking the measuring point at the bottom of the riser body, then determining the height point at the external height position of the riser body and marking it with paint, determining the rotation center point at the height point of the riser body, and marking the positioning point on the upper surface of the mounting piece, then hoisting the riser body to the installation position by telescopic boom or sling, first adjusting the direction and height between the riser body and the mounting piece, and then rotating the riser body according to the rotation center point until the positioning point coincides with the measuring point;

[0025] After determining the welding position, inspect the riser and weld the riser body to the mounting parts. After the riser body is welded and installed, use a total station to measure the distance from the measuring point at the bottom of the riser body to the bottom surface of the mounting parts, calculate the actual deviation angle of the center line of the riser body, and inspect the installed riser body to improve the installation and inspection efficiency of the riser suspension equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the riser body of the present invention;

[0029] Figure 3 It is a schematic diagram of the top view of the structure of the riser body of the present invention;

[0030] Figure 4 It is a schematic cross-sectional structure diagram of the riser body and the mounting member of the present invention.

[0031] Markings in the figure are: 1. riser body; 2. mounting part; 3. ship's side; 4. rotation center point. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a method for installing and inspecting a riser suspension device includes a riser body 1, a mounting member 2 is disposed outside the riser body 1, the riser 1 is tilted, and the mounting member 2 is fixedly mounted on one side of a ship's side 3, and further includes the following steps:

[0034] First, through theoretical calculation, calculate the height values ​​of the four positioning points that need to be flush with the mounting member 2 when the riser body 1 is installed, determine a plane according to the four points, and then place the riser body 1 on the horizontal plane;

[0035] By using a rotating laser leveler to mark lines from top to bottom on the outside of the riser body 1, four measuring points are marked on the bottom of the riser body 1, and then the theoretical value height is marked on the outside of the riser body 1 according to the theoretically calculated value;

[0036] Next, a height point is determined at the external height position of the riser body 1 and marked with paint, a rotation center point 4 is determined at the height point of the riser body 1, and a positioning point is marked on the upper surface of the mounting member 2;

[0037] Then, the riser body 1 is hoisted to the installation position by a telescopic boom or sling, and the riser body 1 is lowered into the water section by section, and the speed is controlled to ensure safe entry into the water. First, the direction and height between the riser body 1 and the mounting member 2 are adjusted, and then the riser body 1 is rotated according to the rotation center point 4 until the positioning point coincides with the measurement point;

[0038] After determining the welding position, inspect the riser and weld the riser body 1 to the mounting member 2, keeping the welding position at the water level;

[0039] After the riser body 1 is installed by welding, the distance from the measuring point at the bottom of the riser body 1 to the bottom surface of the mounting member 2 is measured by a total station, the actual deviation angle of the center line of the riser body 1 is calculated, and the installed riser body 1 is inspected.

[0040] In this embodiment, the measuring point is marked on the bottom of the riser body 1, and then the height point is determined at the external height position of the riser body 1 and marked with paint, the rotation center point 4 is determined at the height point of the riser body 1, and the positioning point is marked on the upper surface of the mounting member 2, and then the riser body 1 is hoisted to the installation position by a telescopic boom or a sling, and the direction and height between the riser body 1 and the mounting member 2 are adjusted first, and then the riser body 1 is rotated according to the rotation center point 4 until the positioning point coincides with the measuring point;

[0041] After determining the welding position, the riser is inspected and the riser body 1 and the mounting member 2 are welded and installed. After the riser body 1 is welded and installed, the distance from the measuring point at the bottom end of the riser body 1 to the bottom surface of the mounting member 2 is measured by a total station, and the actual deviation angle of the center line of the riser body 1 is calculated. The installed riser body 1 is inspected to improve the installation and inspection efficiency of the riser suspension equipment.

[0042] Among them, the positioning points are 19°, 109°, 199°, and 289°, and the measuring points are 0°, 90°, 180°, and 360°.

[0043] Among them, the height of the rotation center point 4 is 3163mm.

[0044] In this embodiment, during the installation of the riser body 1, the rotation center point 4 is determined at the height point of the riser body 1, and after the riser body 1 is hoisted to the top of the mounting member 2, it is lowered into the water section by section, the speed is controlled to ensure safe entry into the water, the direction and height between the riser body 1 and the mounting member 2 are adjusted, and then the riser body 1 is rotated according to the rotation center point 4 until the positioning point coincides with the measuring point, ensuring accurate positioning during the safety process;

[0045] The riser inspection includes aligning the marks on the outer surface of the riser body 1 with the marks on the upper surface of the mounting member 2 one by one, and then using a level to make a final correction to ensure the inclination angle of the riser body 1.

[0046] Among them, after the riser is inspected, a fixing device can be used to fasten the riser body 1 and the mounting member 2, and various methods such as anchoring, ropes, and bases can be used.

[0047] In this embodiment, the stability of the whole after welding is ensured by testing the riser. After the riser is installed, watertightness and pressure tests are performed to ensure that there is no leakage. During the test, attention is paid to observing whether the joints and hangers of the riser are leaking or loose.

[0048] Among them, the distances from the four groups of marking points at the bottom end of the riser body 1 to the bottom surface of the mounting member 2 are line segment a, line segment b, line segment c and line segment d respectively, and the values ​​of line segment c and line segment d are used to check whether the riser body 1 is flush in the left and right directions.

[0049] Line segment c is the dotted line part, and line segment d is the thick solid line part;

[0050] The calculation method of the deviation angle of the center line of the riser body 1 is:

[0051] Short side A = length of line segment a minus length of line segment b;

[0052] Long side B = length between the vertex of line segment a and the vertex of line segment b;

[0053] Hypotenuse C = diameter of riser body 1;

[0054] The deviation angle of the center line of the riser body 1 is obtained by the three side lengths according to the cosine theorem.

[0055] In this embodiment, whether the riser body 1 is flush in the left-right direction is checked according to the value of 3 and the line segment d, and the center line deviation angle is used to check the inclined riser device after the overall installation.

[0056] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0057] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, 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 method for installing and inspecting a riser suspension device, comprising a riser body (1), a mounting member (2) being arranged outside the riser body (1), the riser body (1) being arranged in an inclined manner, the mounting member (2) being fixedly mounted on one side of a ship's side (3), characterized in that: The following steps are also included: First, through theoretical calculation, the height values ​​of four positioning points at which the riser body (1) needs to be flush with the mounting member (2) when installed are calculated, a plane is determined according to the four points, and then the riser body (1) is placed on the horizontal plane; Using a rotating laser leveler, lines are drawn from top to bottom on the outer side of the riser body (1), marking four measuring points on the bottom of the riser body (1), and then theoretical heights are marked on the outer side of the riser body (1) based on theoretically calculated values; Next, a height point is determined at an external height position of the riser body (1) and marked with paint, a rotation center point (4) is determined at the height point of the riser body (1), and a positioning point is marked on the upper surface of the mounting member (2); Then, the riser body (1) is lifted to the installation position by means of a telescopic boom or a sling, and the riser body (1) is lowered into the water section by section, the speed is controlled to ensure safe entry into the water, the direction and height between the riser body (1) and the installation member (2) are first adjusted, and then the riser body (1) is rotated according to the rotation center point (4) until the positioning point coincides with the measurement point; After the welding position is determined, the riser is inspected and the riser body (1) and the mounting member (2) are welded and installed, and the welding position is kept at the water level; After the riser body (1) is welded and installed, the distance from the measuring point at the bottom of the riser body (1) to the bottom surface of the mounting member (2) is measured by a total station, and the actual deviation angle of the center line of the riser body (1) is calculated to inspect the installed riser body (1).

2. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: The positioning points are 19°, 109°, 199°, and 289° respectively, and the measuring points are 0°, 90°, 180°, and 360° respectively.

3. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: The height of the rotation center point (4) is 3163 mm.

4. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: The riser inspection includes aligning the marks on the outer surface of the riser body (1) with the marks on the upper surface of the mounting member (2) one by one, and then using a level to perform a final correction to ensure the inclination angle of the riser body (1).

5. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: After the riser is inspected, a fixing device can be used to fasten the riser body (1) and the mounting member (2) using a variety of methods such as anchoring, ropes, and a base.

6. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: The distances from the four groups of marking points at the bottom end of the riser body (1) to the bottom surface of the mounting member (2) are line segment a, line segment b, line segment c and line segment d respectively. The values ​​of line segment c and line segment d are used to check whether the riser body (1) is flush in the left-right direction.

7. A method for inspecting the installation of a riser suspension device according to claim 1, characterized in that: The calculation method of the deviation angle of the center line of the riser body (1) is: Short side A = length of line segment a minus length of line segment b; Long side B = length between the vertex of line segment a and the vertex of line segment b; Hypotenuse C = diameter of the riser body (1); The deviation angle of the center line of the riser body (1) is obtained by the three side lengths according to the cosine theorem.

Images