CN113237782A - Full-size riser fatigue test device - Google Patents
Full-size riser fatigue test device Download PDFInfo
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- CN113237782A CN113237782A CN202110437430.XA CN202110437430A CN113237782A CN 113237782 A CN113237782 A CN 113237782A CN 202110437430 A CN202110437430 A CN 202110437430A CN 113237782 A CN113237782 A CN 113237782A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a full-size riser fatigue test device, which comprises: the device comprises a vertical pipe with the length of at least more than 20m, a base for mounting the vertical pipe, an internal pressure loading device for providing specified pressure liquid in the vertical pipe, an axial loading device for applying axial load to the vertical pipe, a lateral loading device for applying lateral load to the vertical pipe, and a lateral hydraulic cylinder, wherein the lateral loading device comprises a fixed ring and a sliding ring which are respectively sleeved on the front pipe body and the rear pipe body of the vertical pipe, and the lateral hydraulic cylinder is respectively vertical to the vertical pipe and is respectively connected with the two opposite sides of the fixed ring and the sliding ring; and an analysis system for controlling the testing process. The device can simulate the internal pressure of the riser, the axial load and the lateral load on the end part, and the length of the riser serving as a test body can be adjusted according to the test requirement, so that the actual pressure condition of the actual deep sea pipeline can be completely simulated, and the accurate fatigue life of the deep sea pipeline can be obtained.
Description
Technical Field
The invention relates to the field of deep sea pipeline transportation, in particular to a full-size riser fatigue test device capable of simulating axial, lateral and internal pressures.
Background
The vertical pipe structure is connected with the platform and the seabed and used for transporting collected resources such as petroleum, natural gas and the like, and is widely applied to a deep sea collection system. The marine environment is complex, the types of load types borne by the riser structure are various, and the fatigue resistance of the riser structure is an important index for evaluating the service life of the riser structure and the collection system under the action of various loads. The riser structure is subjected to various loads, in addition to external waves, ocean currents and also to the internal transport of liquids. Therefore, the research on the fatigue performance of the deep-sea riser structure under the action of external load and internal pressure has great significance on the design of the riser structure.
The existing riser structure fatigue test device is complex in loading system, the length of a riser capable of being tested is short, and the test requirement of a long riser structure is difficult to achieve. Therefore, it is necessary to design a testing device capable of meeting the full-scale fatigue test of the large-size stand pipe.
Disclosure of Invention
The invention aims to provide a full-size riser fatigue test device capable of simulating axial, lateral and internal pressures.
Specifically, the invention provides a full-size riser fatigue test device, comprising:
the vertical pipe is a section of an actual deep sea pipeline, and the length of the vertical pipe is at least more than 20 m;
a base for supporting the riser horizontally on the upper surface;
the internal pressure loading device comprises a water tank, an input pipe and an output pipe, wherein the input pipe and the output pipe are respectively connected with the two ends of the water tank and the two ends of the vertical pipe in a sealing manner;
the axial loading device comprises hydraulic storage cylinders which are respectively arranged at one ends of the input pipe and the output pipe, which are connected with the vertical pipe, wherein the diameter of each hydraulic storage cylinder is larger than that of the vertical pipe, the hydraulic storage cylinders apply axial ballast load with preset size to the end part of the vertical pipe by storing liquid, and the hydraulic storage cylinders are respectively connected with the two ends of the vertical pipe by flanges fixed at the end part of the vertical pipe;
the side loading device comprises a fixed ring and a sliding ring which are respectively sleeved on the front pipe body and the rear pipe body of the vertical pipe, and side hydraulic cylinders which are respectively vertical to the vertical pipe and are respectively connected with two opposite sides of the fixed ring and the sliding ring;
and the analysis system is used for acquiring the detection parameters of the current vertical pipe according to the sensors arranged at each position, and further analyzing the test result of the vertical pipe.
The invention can simulate the internal pressure of the riser, the axial load and the lateral load on the end part, and the length of the riser as a test body can be adjusted according to the test requirement, the length of the riser adopted in the invention is at least 20 meters, and the actual pressure condition of the actual deep sea pipeline can be completely simulated to obtain the accurate fatigue life of the deep sea pipeline.
Drawings
Fig. 1 is a schematic structural view of a fatigue testing apparatus according to an embodiment of the present invention.
Detailed Description
The detailed structure and implementation process of the present solution are described in detail below with reference to specific embodiments and the accompanying drawings.
As shown in FIG. 1, in one embodiment of the invention, a full-scale riser fatigue test device is disclosed, which comprises a riser, a base, an internal pressure loading device, an axial loading device, a lateral loading device and an analysis system.
The vertical pipe is used as an experimental body, is manufactured by cutting a full-size actual deep sea pipeline, and has a length at least greater than 20 m.
The base acts as a test stand for supporting the riser horizontally on the upper surface.
The internal pressure loading device is used for simulating the liquid pressure inside the stand pipe, and comprises a liquid tank for containing liquid, an input pipe communicated with one end of the stand pipe and an output end communicated with the other end of the stand pipe, wherein a high-pressure pump for applying specified pressure to liquid flowing through the input pipe is arranged on the input pipe, and a cooling device for reducing the temperature of discharged liquid is arranged on an output pipe.
The axial loading device is used for applying axial force to a vertical pipe and comprises hydraulic storage cylinders which are arranged at two ends of the vertical pipe respectively, the diameters of the hydraulic storage cylinders are larger than the diameter of the vertical pipe, one ends of the two hydraulic storage cylinders are connected with an input pipe and an output pipe in a sealing mode respectively, the other ends of the two hydraulic storage cylinders are connected with the vertical pipe through flanges respectively, the end portion of the hydraulic loading device is connected with a pipe end flange, and loading is carried out on the pipe end flange through stored liquid so as to realize axial pressure load loading.
The lateral loading device is used for applying lateral ballast load vertical to a pipe body to the vertical pipe, and comprises a fixing ring and a sliding ring which are respectively sleeved on the front pipe body and the rear pipe body of the vertical pipe, and lateral hydraulic cylinders which are respectively vertical to the vertical pipe and are respectively connected with two opposite sides of the fixing ring and the sliding ring.
The analysis system is used for acquiring detection parameters of the current vertical pipe in the test process according to the sensors arranged everywhere so as to analyze the test result of the vertical pipe.
During testing, the vertical pipe is firstly installed on the base, flanges are welded at two ends of the vertical pipe, one ends of the two hydraulic storage cylinders are respectively fixed with two ends of the vertical pipe through the flanges, the input pipe is connected with the other ends of the high-pressure pump and the hydraulic storage cylinders, the high-pressure pump is connected with the water tank, the output pipe is connected with the cooling device and the other ends of the hydraulic storage cylinders, the cooling device and the water tank are connected, the vertical pipe body is sleeved with the fixing ring and the sliding ring, and then the lateral hydraulic cylinders are respectively installed on two sides of the fixing ring and the sliding ring. And meanwhile, corresponding pressure sensors, displacement sensors and force sensors are respectively arranged on the vertical pipe, the lateral hydraulic cylinder, the high-pressure pump, the cooling water tank and the hydraulic storage cylinder and are connected with an analysis system.
After the installation is finished, the high-pressure pump is started to input liquid in the water tank into the vertical pipe through the input pipe according to preset pressure, and the liquid can generate exciting force inside due to diameter change when flowing through the hydraulic storage cylinder, so that axial load is generated on the end part of the vertical pipe. And the lateral hydraulic cylinders can apply lateral loads to the vertical pipe under the control of the analysis system, and because the lateral hydraulic cylinders are respectively arranged on two sides of the fixed ring and the sliding ring, the lateral loads in different directions can be simulated relative to the vertical pipe. The liquid heated by pressurization in the vertical pipe enters the cooling device through the output pipe, is cooled to a preset temperature and then flows back to the water tank, so that a closed cycle is formed.
By controlling the hydraulic input frequency of the high pressure pump, the hydraulic storage cylinder can be made to apply a cyclic load to the end of the riser. The riser can generate fatigue damage under the long-time action of the axial force and the lateral bending moment cyclic load, and further the fatigue damage cycle frequency of the accumulated damage of the riser can be obtained.
The embodiment can simulate the internal pressure of the riser, the axial load and the lateral load on the end part, and the length of the riser serving as a test body can be adjusted according to test requirements.
In one embodiment of the invention, a support rod for supporting the stand pipe is arranged on the base along the axial direction of the stand pipe, a circular ring sleeved on the outer surface of the stand pipe is fixed at the end part of the support rod, and the inner diameter of the circular ring is larger than the outer diameter of the stand pipe. The supporting rods can be provided with a plurality of supporting rods so that the vertical pipe can be kept horizontal, and the diameter of the circular ring is larger than the pipe body of the vertical pipe, so that the local movement of the vertical pipe is not influenced under the condition of limiting the basic position of the vertical pipe.
Further, the support rod can adopt a hydraulic lifting rod to conveniently keep the vertical pipe horizontal by adjusting the height.
In one embodiment of the invention, the inner diameters of the fixed ring and the sliding ring are larger than the inner diameter of the stand pipe, so that the stand pipe can not be influenced in displacement when the stand pipe is subjected to axial deformation displacement under the action of axial force.
In one embodiment of the invention, the lateral hydraulic cylinders on two sides of the sliding ring are supported on the base through the base, the base is provided with a slide way which is axially parallel to the vertical pipe, and one end of the base, which is connected with the base, is clamped on the sliding through the sliding block. The structure can adjust the position of the lateral hydraulic cylinder so as to better apply the lateral load.
Furthermore, the base can adopt hydraulic pressure elevation structure, and the base is connected one end with the lateral hydraulic cylinder and is articulated, and under this structure, the base can promote the lateral hydraulic cylinder of solid fixed ring and slip ring both sides according to the experimental requirement of difference and go up and down to exert radial load to the riser on the different directions of the circumference of following the riser pipe shaft.
In one embodiment of the invention, the cooling device comprises a box body for containing output liquid, and a heat exchange pipe arranged in the box body and used for communicating with an external low-temperature medium, wherein a hydraulic output port and a liquid input port which are respectively connected with the output pipe and the water tank are arranged on the box body. The cryogenic medium here may be water.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A full-scale riser fatigue test device, characterized by, includes:
the vertical pipe is a section of an actual deep sea pipeline, and the length of the vertical pipe is at least more than 20 m;
a base for supporting the riser horizontally on the upper surface;
the internal pressure loading device comprises a water tank, an input pipe and an output pipe, wherein the input pipe and the output pipe are respectively connected with the two ends of the water tank and the two ends of the vertical pipe in a sealing manner;
the axial loading device comprises hydraulic storage cylinders which are respectively arranged at one ends of the input pipe and the output pipe, which are connected with the vertical pipe, wherein the diameter of each hydraulic storage cylinder is larger than that of the vertical pipe, the hydraulic storage cylinders apply axial ballast load with preset size to the end part of the vertical pipe by storing liquid, and the hydraulic storage cylinders are respectively connected with the two ends of the vertical pipe by flanges fixed at the end part of the vertical pipe;
the side loading device comprises a fixed ring and a sliding ring which are respectively sleeved on the front pipe body and the rear pipe body of the vertical pipe, and side hydraulic cylinders which are respectively vertical to the vertical pipe and are respectively connected with two opposite sides of the fixed ring and the sliding ring;
and the analysis system is used for acquiring the detection parameters of the current vertical pipe according to the sensors arranged at each position, and further analyzing the test result of the vertical pipe.
2. The full-scale riser fatigue testing apparatus of claim 1,
a support rod for supporting the stand pipe is arranged on the base along the axial direction of the stand pipe, a circular ring sleeved on the outer surface of the stand pipe is fixed at the end part of the support rod, and the inner diameter of the circular ring is larger than the outer diameter of the stand pipe.
3. The full-scale riser fatigue testing apparatus of claim 2,
the support rod is a hydraulic lifting rod, and the stand pipe can be kept horizontal by adjusting the height.
4. The full-scale riser fatigue testing apparatus of claim 1,
the inner diameters of the fixing ring and the sliding ring are larger than that of the stand pipe, so that the stand pipe can not influence the displacement of the stand pipe when the stand pipe is axially deformed under the action of axial force.
5. The full-scale riser fatigue testing apparatus of claim 4,
lateral hydraulic cylinders on two sides of the sliding ring are supported on the base through a base, a slide way which is axially parallel to the vertical pipe is arranged on the base, and one end, connected with the base, of the base is clamped on the sliding part through a sliding block.
6. The full-scale riser fatigue testing apparatus of claim 5,
the base is a hydraulic lifting structure, one end of the base, which is connected with the lateral hydraulic cylinder, is hinged, and the base pushes the lateral hydraulic cylinders on two sides of the fixed ring and the sliding ring to lift according to different experimental requirements so as to apply radial loads to the vertical pipe from different directions.
7. The full-scale riser fatigue testing apparatus of claim 1,
by controlling the fluid input frequency of the internal pressure device, the hydraulic storage cylinder can be made to apply a cyclic load to the end of the riser.
8. The full-scale riser fatigue testing apparatus of claim 1,
the cooling device comprises a box body for containing output liquid and a heat exchange tube arranged in the box body and used for being communicated with external low-temperature media, and a hydraulic output port and a liquid input port which are respectively connected with the output tube and the water tank are arranged on the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110437430.XA CN113237782A (en) | 2021-04-22 | 2021-04-22 | Full-size riser fatigue test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110437430.XA CN113237782A (en) | 2021-04-22 | 2021-04-22 | Full-size riser fatigue test device |
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| CN113237782A true CN113237782A (en) | 2021-08-10 |
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| CN202110437430.XA Pending CN113237782A (en) | 2021-04-22 | 2021-04-22 | Full-size riser fatigue test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848139A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | A cyclic loading fatigue test device for pipeline moment of flexure |
| CN113848134A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Fatigue test method for circularly applying bending moment to pipeline |
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| CN110018047A (en) * | 2019-03-12 | 2019-07-16 | 天津大学 | A kind of deep-sea pipeline Complicated Loads combination loading pilot system |
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2021
- 2021-04-22 CN CN202110437430.XA patent/CN113237782A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN105806694A (en) * | 2016-01-29 | 2016-07-27 | 天津大学 | Combined loading testing device for complex loads of submarine pipelines |
| CN110018047A (en) * | 2019-03-12 | 2019-07-16 | 天津大学 | A kind of deep-sea pipeline Complicated Loads combination loading pilot system |
| CN110196156A (en) * | 2019-03-12 | 2019-09-03 | 天津大学 | A kind of deep-sea pipeline Complicated Loads combination loading test method |
| CN112268808A (en) * | 2020-10-21 | 2021-01-26 | 天津大学 | Test method for combined action of bending moment and internal pressure of submarine pipeline |
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Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848139A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | A cyclic loading fatigue test device for pipeline moment of flexure |
| CN113848134A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Fatigue test method for circularly applying bending moment to pipeline |
| CN113848139B (en) * | 2021-09-22 | 2024-05-03 | 天津大学 | Circulating loading fatigue experiment device for pipeline bending moment |
| CN113848134B (en) * | 2021-09-22 | 2024-05-10 | 天津大学 | Fatigue test method for applying bending moment to pipeline circulation |
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Application publication date: 20210810 |