A design method for ship cross-module high-pressure pipeline

Abstract

The invention relates to the technical field of pipeline layout, and discloses a design method for a cross-module high-pressure pipeline of a ship, comprising establishing a cross-module high-pressure pipeline layout model; inputting pipeline parameters, and performing primary stress calculation and secondary stress calculation on the cross-module high-pressure pipeline layout model; analyzing and obtaining stress nodes exceeding allowable stress in the cross-module high-pressure pipeline layout model; adding a rigid expansion bend to the cross-module high-pressure pipeline layout model; arranging a pipeline limit sliding bracket at each stress node exceeding allowable stress, and the pipeline can slide on the pipeline limit sliding bracket along the direction of the stress node exceeding the allowable stress; when all nodes of the cross-module high-pressure pipeline layout model are less than the allowable stress, the cross-module high-pressure pipeline layout model of the ship meets the design requirements; the invention can release primary stress and secondary stress caused by different working conditions on two module structures of ships with different accelerations, thereby improving the safety and reliability of the pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline arrangement, and in particular to a design method for a ship cross-module high-pressure pipeline. Background Art

[0002] A hydraulic drilling rig, also known as a hydraulic cylinder lifting drilling rig, uses a hydraulic variable oil pump to provide power to the lifting system and drilling system of the drilling rig. Since hydraulic equipment has the advantages of large transmission torque, simple and convenient control, stable operation, and easy automation and intelligence, hydraulic drilling rigs have become an important type of offshore drilling equipment.

[0003] Because the hydraulic drilling rig has a large lifting capacity, which can reach thousands of tons, and the lifting speed is fast, with a response time as short as 2 to 3 seconds, the hydraulic pipeline has a large diameter and a high pressure. In actual applications, the lifting system (drilling rig hydraulic pump station) and the drilling system (derrick drilling rig hydraulic cylinder, accumulator, nitrogen bottle) are arranged in two independent box structures. The box structure between the drilling rig hydraulic pump station is set in the module structure of the bow upper construction area, and the box structure of the drilling system is set on the module structure on the other side of the ship. In this way, the two parts of the box structure During the operation of the ship, it is affected by external factors such as waves, wind, ballast, etc., which will cause different accelerations and different relative displacements in the X, Y, and Z directions. If the ordinary rigid pipeline design method is directly adopted, there will be a great probability that the pipeline will be plastically deformed or even damaged and leaked under the ship drilling operation conditions. In severe cases, it may even cause drilling accidents and pollute the marine environment. The hydraulic system of the hydraulic drilling rig has the characteristics of large pipe diameter and high pressure. Using high-pressure hoses to connect will cause maintenance difficulties and operational risks. Summary of the invention

[0004] The purpose of the present invention is to provide a design method for a ship cross-module high-pressure pipeline, which can release primary stress and secondary stress caused by different working conditions and improve the safety and reliability of the pipeline.

[0005] In order to achieve the above object, the present invention provides a design method for a ship cross-module high-pressure pipeline, comprising the following steps:

[0006] Step 1: Establish a cross-module high-pressure pipeline layout model in the pipeline stress analysis software, where the cross-module high-pressure pipeline layout model is set across the module structures in two different areas of the ship;

[0007] Step 2: After inputting the pipeline parameters, the cross-module high-pressure pipeline layout model is subjected to primary stress calculation under pressure load and continuous load, as well as secondary stress calculation under pipeline thermal expansion and contraction and displacement load;

[0008] Step 3, analyzing and obtaining stress nodes exceeding allowable stress in the cross-module high-pressure pipeline layout model;

[0009] Step 4: Add a rigid expansion bend in the area near the stress node that exceeds the allowable stress on the cross-module high-pressure pipeline layout model; set a pipeline limit sliding bracket at each stress node that exceeds the allowable stress, and the pipeline can slide on the pipeline limit sliding bracket along the direction of the stress node that exceeds the allowable stress;

[0010] Step 5: When all nodes of the cross-module high-pressure pipeline layout model are less than the allowable stress, the ship cross-module high-pressure pipeline layout model meets the design requirements.

[0011] As a preferred solution of the present invention, in step 2, the primary stress calculation formula is:

[0012]

[0013]

[0014] Where: S L is the primary stress; F is the axial force generated by the continuous load; A is the cross-sectional area of ​​the pipeline; P is the design pressure; D is the average diameter of the pipeline; S is the wall thickness of the pipeline; M is the composite bending moment; W is the bending section modulus; S h is the allowable stress value at the highest temperature.

[0015] As a preferred solution of the present invention, in step 2, the secondary stress calculation formula is:

[0016]

[0017]

[0018] Where: S E is the secondary stress; S A is the allowable displacement stress range; f is the allowable displacement stress range reduction factor considering the total number of cycles within the design service life; S c is the allowable stress value at the lowest temperature; S h is the allowable stress value at the highest temperature.

[0019] As a preferred solution of the present invention, the pipeline limit sliding bracket includes an X-axis sliding bracket, an XY-axis sliding bracket and an XZ-axis sliding bracket;

[0020] An X-axis sliding bracket is provided at a stress node where the direction of the allowable stress is in the X-axis direction of the ship, and the pipeline can slide forward and backward along the X-axis direction of the ship on the X-axis sliding bracket;

[0021] An XY-axis sliding bracket is provided at a stress node where the direction of the allowable stress is in the direction of the ship's Y-axis, and the pipeline can slide left and right along the ship's Y-axis direction and can slide forward and backward along the ship's X-axis direction on the XY-axis sliding bracket;

[0022] An XZ-axis sliding bracket is arranged at a stress node where the direction of the allowable stress is in the Z-axis direction of the ship, and the pipeline can slide up and down along the Z-axis direction of the ship and can slide forward and backward along the X-axis direction of the ship on the XZ-axis sliding bracket.

[0023] As a preferred solution of the present invention, in step 4, the rigid expansion bend is arranged on the cross-module high-pressure pipeline layout model along the X-axis direction of the ship.

[0024] As a preferred solution of the present invention, in step 4, the rigid expansion bend adopts a π-shaped rigid expansion bend.

[0025] As a preferred solution of the present invention, in step 4, a sealed tank penetration component for ships is used at the tank penetration point of the cross-module high-pressure pipeline layout model.

[0026] As a preferred solution of the present invention, the pipeline stress analysis software is CAESARⅡ software.

[0027] As a preferred solution of the present invention, in step 2, primary stress calculation and secondary stress calculation are performed under operating conditions, high temperature conditions, low temperature conditions and ship extreme conditions respectively.

[0028] Compared with the prior art, the design method of a ship cross-module high-pressure pipeline in the embodiment of the present invention has the following beneficial effects:

[0029] The present invention can release the stress of the ship's cross-module high-pressure pipeline through a rigid expansion bend, and at the same time, a limited sliding bracket is arranged at the stress node that exceeds the allowable stress. The pipeline can slide in the direction of the stress node that exceeds the allowable stress, and can fully release the primary stress and secondary stress caused by different working conditions, thereby avoiding pipeline damage to the ship's cross-module high-pressure pipeline in the module structures of two ships with different accelerations, thereby ensuring the safety of operation and easy maintainability. DETAILED DESCRIPTION

[0030] The following examples are used to further describe the specific embodiments of the present invention. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] A design method for a ship cross-module high-pressure pipeline according to a preferred embodiment of the present invention comprises the following steps:

[0033] Step 1: Establish a cross-module high-pressure pipeline layout model through pipeline stress analysis software (CAESARⅡ software), and the cross-module high-pressure pipeline layout model is set across the module structure of two different areas of the ship;

[0034] Step 2: Input pipeline parameters into the pipeline stress analysis software (CAESARⅡ software) to calculate the primary stress of the cross-module high-pressure pipeline layout model under pressure load and continuous load, as well as the secondary stress under the thermal expansion and contraction of the pipeline and displacement load; pipeline parameters include the design pressure of the pipeline, the medium passing through the pipeline, the operating temperature, the pipeline material, the position of the pipeline support and the conventional pipeline support form (fixed support for fixing the pipeline), as well as the pipeline path, nodes, constraints, additional loads, material properties, and medium properties;

[0035] Step 3, analyzing and obtaining stress nodes exceeding allowable stress in the cross-module high-pressure pipeline layout model;

[0036] Step 4: Add a rigid expansion bend in the area near the stress node that exceeds the allowable stress on the cross-module high-pressure pipeline layout model; set a pipeline limit sliding bracket at each stress node that exceeds the allowable stress (replace the fixed bracket at the original position with the pipeline limit sliding bracket), and the pipeline can slide on the pipeline limit sliding bracket along the direction of the stress node that exceeds the allowable stress;

[0037] Step 5: Perform primary stress calculation and secondary stress calculation on the cross-module high-pressure pipeline layout model. When all nodes of the cross-module high-pressure pipeline layout model are less than the allowable stress, the ship cross-module high-pressure pipeline layout model meets the design requirements.

[0038] The present invention can release the stress of the ship's cross-module high-pressure pipeline through a rigid expansion bend, and at the same time, a limited sliding bracket is arranged at the stress node that exceeds the allowable stress. The pipeline can slide in the direction of the stress node that exceeds the allowable stress, and can fully release the primary stress and secondary stress caused by different working conditions, thereby avoiding pipeline damage to the ship's cross-module high-pressure pipeline in the module structures of two ships with different accelerations, thereby ensuring the safety of operation and easy maintainability.

[0039] In this embodiment, the cross-module high-pressure pipeline is used to connect the lifting system (drilling rig hydraulic pump station) and the drilling system (derrick drilling rig hydraulic cylinder, accumulator, nitrogen bottle) of the drilling and production vessel, and the lifting system and the drilling system are arranged on two independent box structures. The box structure between the drilling rig hydraulic pump station is set in the module structure of the bow upper construction area, and the box structure of the drilling system is set in the module structure of the upper construction area on the other side of the ship. The cross-module high-pressure pipeline has a large diameter and a high fluid medium pressure.

[0040] Exemplarily, in step 2, the primary stress calculation formula is:

[0041]

[0042]

[0043] Where: S L is the primary stress, MPa; F is the axial force generated by the continuous load, N; A is the cross-sectional area of ​​the pipe, mm 2 ; P is the design pressure, MPa; D is the average diameter of the pipeline, mm; S is the wall thickness of the pipeline, mm; M is the composite bending moment, N.mm; W is the bending section modulus, mm 2 ; S h is the allowable stress value at the maximum temperature, MPa.

[0044] Exemplarily, in step 2, the secondary stress calculation formula is:

[0045]

[0046]

[0047] Where: S E is the secondary stress, MPa; S A is the allowable displacement stress range, MPa; f is the allowable displacement stress range reduction factor considering the total number of cycles within the design service life; S c is the allowable stress value at the lowest temperature, MPa; S h is the allowable stress value at the maximum temperature, MPa.

[0048] It should be noted that the X-axis direction of the ship is the length direction of the ship, the Y-axis direction of the ship is the width direction of the ship, and the Z-axis direction of the ship is the height direction of the ship.

[0049] Exemplarily, the pipeline limiting sliding bracket includes an X-axis sliding bracket, an XY-axis sliding bracket and an XZ-axis sliding bracket; an X-axis sliding bracket is arranged at a stress node where the direction of the allowable stress is in the direction of the X-axis of the ship, and the pipeline can slide back and forth along the X-axis direction of the ship on the X-axis sliding bracket; an XY-axis sliding bracket is arranged at a stress node where the direction of the allowable stress is in the direction of the Y-axis of the ship, and the pipeline can slide left and right along the Y-axis direction of the ship and can slide back and forth along the X-axis direction of the ship on the XY-axis sliding bracket; an XZ-axis sliding bracket is arranged at a stress node where the direction of the allowable stress is in the direction of the Z-axis of the ship, and the pipeline can slide up and down along the Z-axis direction of the ship and can slide back and forth along the X-axis direction of the ship on the XZ-axis sliding bracket. When the ship is sailing (such as changing speed), the ship can actually The X-axis acceleration (in the direction of the ship's length) generated by the ship's load is more significant than the Y-axis acceleration (in the direction of the ship's width) and the Z-axis acceleration (in the direction of the ship's height). In this way, the pipeline can slide back and forth along the X-axis direction of the ship on each pipeline limit sliding bracket, and the plastic deformation of the pipeline can be effectively reduced by the X-axis movement of the pipeline on the pipeline limit sliding bracket, thereby improving the safety and stability of the ship's cross-module high-pressure pipeline. By setting the X-axis sliding bracket, the XY-axis sliding bracket and the XZ-axis sliding bracket in the direction of the stress node exceeding the allowable stress, the displacement direction of the pipeline can be controlled, and the pipeline can be prevented from being displaced in an unexpected direction, so that the deformation of the pipeline or the displacement of each pipeline node is carried out in a direction that is beneficial to protecting the ship's cross-module high-pressure pipeline or beneficial to thermal compensation.

[0050] Exemplarily, in step 4, a rigid expansion bend is arranged on the cross-module high-pressure pipeline layout model along the X-axis direction of the ship. The X-axis direction of the ship is the same as the direction of the ship when sailing. The setting of the rigid expansion bend can further absorb the stress caused by the relative displacement due to the different accelerations between the two different module structures during navigation, and absorb the displacement caused by the thermal expansion and contraction of the pipeline, reduce stress concentration, and ensure the normal operation of the cross-module high-pressure pipeline on the ship.

[0051] Exemplarily, in step 4, the rigid expansion bend adopts a π-shaped rigid expansion bend, which can absorb displacement in multiple directions, thereby improving the safety of the ship's cross-module high-pressure pipeline by absorbing displacement and reducing stress concentration.

[0052] Exemplarily, in step 4, a sealed tank penetration component for ships (i.e., an MCT flexible watertight tank penetration component) is used at the penetration point of the cross-module high-pressure pipeline layout model to effectively release the stress generated by the two module structures with different accelerations on the cross-module high-pressure pipeline, while ensuring the watertightness between the pipeline and the module structure.

[0053] Exemplarily, in step 2, primary stress calculation and secondary stress calculation are performed under operating conditions, high temperature conditions, low temperature conditions and ship limit conditions, respectively. In step 3, the pipeline nodes exceeding the allowable stress in each condition are found, and it is ensured that all pipeline nodes of the cross-module high-pressure pipeline layout model are less than the allowable stress under each condition.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A design method for a ship's cross-module high-pressure pipeline, characterized in that: The following steps are involved: Step 1: Establish a cross-module high-pressure pipeline layout model, and the cross-module high-pressure pipeline layout model is set across module structures in two different areas of the ship; Step 2: Input pipeline parameters into the pipeline stress analysis software, and perform primary stress calculation under pressure load and continuous load on the cross-module high-pressure pipeline layout model, as well as secondary stress calculation under pipeline thermal expansion and contraction and displacement load; Step 3, analyzing and obtaining stress nodes exceeding allowable stress in the cross-module high-pressure pipeline layout model; Step 4: Add a rigid expansion bend in the vicinity of the stress node exceeding the allowable stress on the cross-module high-pressure pipeline layout model, and the rigid expansion bend is arranged on the cross-module high-pressure pipeline layout model along the X-axis direction of the ship; a ship-used sealed cabin penetration part is adopted at the cabin penetration of the cross-module high-pressure pipeline layout model; a pipeline limit sliding bracket is arranged at each stress node exceeding the allowable stress, and the pipeline can slide on the pipeline limit sliding bracket along the direction of the stress node exceeding the allowable stress; the pipeline limit sliding bracket includes an X-axis sliding bracket, an XY-axis sliding bracket and an XZ-axis sliding bracket; An X-axis sliding bracket is provided at a stress node where the direction of the allowable stress is in the X-axis direction of the ship, and the pipeline can slide forward and backward along the X-axis direction of the ship on the X-axis sliding bracket; An XY-axis sliding bracket is provided at a stress node where the direction of the allowable stress is in the direction of the ship's Y-axis, and the pipeline can slide left and right along the ship's Y-axis direction and can slide forward and backward along the ship's X-axis direction on the XY-axis sliding bracket; An XZ-axis sliding bracket is arranged at a stress node where the direction of the allowable stress is in the Z-axis direction of the ship, and the pipeline can slide up and down along the Z-axis direction of the ship and can slide forward and backward along the X-axis direction of the ship on the XZ-axis sliding bracket; wherein the X-axis direction of the ship is the length direction of the ship, the Y-axis direction of the ship is the width direction of the ship, and the Z-axis direction of the ship is the height direction of the ship; Step 5: When all nodes of the cross-module high-pressure pipeline layout model are less than the allowable stress, the ship cross-module high-pressure pipeline layout model meets the design requirements.

2. The design method of ship cross-module high-pressure pipeline according to claim 1, characterized in that: In step 2, the primary stress calculation formula is: Where: S L is the primary stress; F is the axial force generated by the continuous load; A is the cross-sectional area of ​​the pipeline; P is the design pressure; D is the average diameter of the pipeline; S is the wall thickness of the pipeline; M is the composite bending moment; W is the bending section modulus; S h is the allowable stress value at the highest temperature.

3. The design method of ship cross-module high-pressure pipeline according to claim 2, characterized in that: In step 2, the secondary stress calculation formula is: Where: S E is the secondary stress; S A is the allowable displacement stress range; f is the allowable displacement stress range reduction factor considering the total number of cycles within the design service life; S c is the allowable stress value at the lowest temperature; S h is the allowable stress value at the highest temperature.

4. The design method of ship cross-module high-pressure pipeline according to claim 1, characterized in that: The rigid expansion bend adopts a π-shaped rigid expansion bend.

5. The design method of ship cross-module high-pressure pipeline according to claim 1, characterized in that: The pipeline stress analysis software is CAESARⅡ software.

6. The design method of ship cross-module high-pressure pipeline according to claim 1, characterized in that: In step 2, primary stress calculation and secondary stress calculation are performed under operating conditions, high temperature conditions, low temperature conditions and ship extreme conditions respectively.

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