CN113834841A - Liquid nitrogen thermal shock testing device for butt welding seam of metal pipeline - Google Patents
Liquid nitrogen thermal shock testing device for butt welding seam of metal pipeline Download PDFInfo
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- CN113834841A CN113834841A CN202010579596.0A CN202010579596A CN113834841A CN 113834841 A CN113834841 A CN 113834841A CN 202010579596 A CN202010579596 A CN 202010579596A CN 113834841 A CN113834841 A CN 113834841A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The invention belongs to the field of low-temperature testing of materials, and particularly relates to a low-temperature thermal shock testing device for a butt weld of a metal pipeline. Including sealed cowling, stainless steel clamp, bolt, O type circle, refrigerant import and export etc. wherein, sealed cowling is placed in pipeline welding seam area, uses stainless steel clamp, bolt to fix to provide axial seal, low temperature O type circle assembly provides the hoop sealed in the recess of sealed cowling inner wall. And standard KF vacuum flange interfaces are processed on the upper side and the lower side of the sealing cover and used for connecting a refrigerant inlet and outlet pipeline, and temperature measuring holes are reserved on the upper side of the sealing cover and used for monitoring and recording the temperature change of a welding seam area by a temperature measuring system. The invention has the following remarkable effects: the thermal shock test of the device is carried out in an ultralow-temperature limited space, so that the heat exchange between a welding line thermal shock area and the environment is greatly reduced, and the cooling rate of the test area is improved; by means of the restraint and sealing treatment of the liquid nitrogen flow path, the safety of operators and adjacent components is greatly guaranteed.
Description
Technical Field
The invention belongs to the field of low-temperature testing of materials, and particularly relates to a liquid nitrogen thermal shock testing device for a butt weld of a metal pipeline.
Background
The superconducting Tokamak device is internally provided with a complex cryogenic pipe forest system for conveying liquid nitrogen, liquid helium, cryogenic helium gas and other coolants, a pipeline is subjected to repeated cold and hot impact during service, and a welding seam position of the pipeline is sensitive to thermal stress, so that a thermal impact test of a service temperature region is usually carried out on a welding seam region, and the execution steps of the thermal impact test are generally carried out after ray detection and ultrasonic detection and before pressure test and leakage detection. Since liquid nitrogen is rapidly gasified in a normal temperature environment and easily splashed to a surrounding space to damage operators or heat-sensitive devices, and generally, test fluid is not allowed to be directly sprayed to a weld joint area, the sealing of the liquid nitrogen becomes an indispensable requirement for thermal shock testing.
At present, the liquid nitrogen thermal shock device for materials or parts is mainly based on the type of a test box and is not suitable for the finished butt-jointed welding seam of the metal pipeline.
Disclosure of Invention
The invention aims to provide a liquid nitrogen thermal shock testing device for a butt-jointed weld joint of a metal pipeline, which can meet the requirements of safe operation and protection of the weld joint of the metal pipeline in the temperature region.
The invention is realized by the following steps: the utility model provides a liquid nitrogen thermal shock testing arrangement of metal pipeline butt weld, it includes sealed container, fixing device, sealed container place outside the pipeline welding seam area of butt weld pipeline, provide sealed for the liquid nitrogen in thermal shock testing area, fixing device is used for installing sealed container in the pipeline welding seam area.
The sealed container comprises a sealing cover, the sealing cover comprises two semicircular sealing covers, the two semicircular sealing covers wrap the outside of a welding line area of the butt welding line pipeline, and a cavity is formed between the sealing cover and the butt welding line pipeline.
One end of the sealing cover is provided with a liquid nitrogen inlet, and the other end of the sealing cover is provided with a liquid nitrogen outlet.
And the liquid nitrogen inlet and the liquid nitrogen outlet are respectively connected with a liquid nitrogen corrugated pipe.
The inner sides of the two ends of the sealing cover are provided with semicircular grooves, and the O-shaped rings are arranged in the grooves at the two ends of the sealing cover.
And a fixing device is arranged outside the sealing cover.
The fixing device comprises stainless steel clamps and bolts, the two groups of stainless steel clamps are clamped outside the sealing cover, and the sealing cover is fixed in a welding seam area of the butt welding seam pipeline through the bolts.
The low-temperature sealing O-shaped ring is made of a polytetrafluoroethylene elastic belt.
The sealing cover is made of epoxy resin or polytetrafluoroethylene.
The invention has the following effects: the thermal shock test of the device is carried out in an ultralow-temperature limited space, so that the axial heat conduction of a welding line thermal shock area is greatly reduced, and the cooling rate of a test area is improved; by means of the restraint and sealing treatment of the liquid nitrogen flow path, the safety of operators and adjacent components is greatly guaranteed.
Drawings
FIG. 1 is a schematic view of a liquid nitrogen thermal shock testing device for a butt weld of a metal pipeline provided by the invention;
fig. 2 is a cross-sectional view of fig. 1.
In the figure: 1, butt welding a pipeline; 2, sealing the cover; 3, stainless steel hoops; 4, a liquid nitrogen inlet; 5, a liquid nitrogen outlet; 6, bolts; 7 an axial sealing area; 8O-shaped rings; 9 in the region of the weld seam.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Through reasonable structural design, the liquid nitrogen is released from the storage container on the surface of the welding line, and does not leak in the whole process of flowing out of the outlet through the sealing area. The sealing cover is made of low-temperature-resistant epoxy resin, polytetrafluoroethylene and other materials, so that heat exchange between a welding line and outside air in the test process is reduced, and the test time is shortened; the local sealing treatment ensures the safety of field operators and equipment, and the used liquid nitrogen can be recycled and reused from an outlet.
Sealing areas with different volumes can be provided by adjusting the width and the inner diameter of the cover, and the liquid nitrogen can be ensured to be fully contacted with the surface of a welding seam. The sealing cover is fixed on the outer side of the pipeline by using a hoop and is clamped and fixed by a bolt. The sealing cover is internally provided with grooves with proper sizes at two ends, and the grooves are internally provided with low-temperature resistant O-shaped rings, so that the leakage of liquid nitrogen from the side surface after the sealing cover is cooled and contracted can be effectively avoided. The side of sealed cowling is the entry and the export of liquid nitrogen, and the vacuum ring flange structure of KF specification is adopted to the end, conveniently carries out rapid Assembly or dismantlement with the bellows.
Normally liquid nitrogen flows in from the bottom of the pipe and out from the top to ensure that the sealed enclosure is filled with liquid nitrogen during the test. If the surface temperature of the pipeline needs to be detected, the low-temperature thermocouple can be fixed on the outer wall of the metal pipe on the two sides of the sealing cover for indirect measurement.
As shown in fig. 1, the liquid nitrogen thermal shock testing device for the metal pipeline butt weld comprises a sealing container and a fixing device, wherein the sealing container is placed outside a pipeline weld area 9 of a butt weld pipeline 1 to provide sealing for liquid nitrogen in the thermal shock testing area, and the fixing device is used for installing the sealing container in the pipeline weld area.
The butt-welding pipeline 1 is a metal pipeline with a circular cross section for completing the butt-welding of the pipeline, the middle part of the butt-welding pipeline 1 is a welding area 9, and enough space is arranged on the periphery of the pipeline to connect with the inlet corrugated pipe and the outlet corrugated pipe of liquid nitrogen.
The sealed container comprises a sealed cover 2, the two semicircular sealed covers 2 are wrapped outside a welding seam area 9 of a butt welding seam pipeline 1, a cavity is formed between the sealed cover 2 and the butt welding seam pipeline 1, one end of the sealed cover 2 is provided with a liquid nitrogen inlet 4, the other end of the sealed cover is provided with a liquid nitrogen outlet 5, the liquid nitrogen inlet 4 and the liquid nitrogen outlet 5 are respectively connected with a liquid nitrogen corrugated pipe, and the inlet and the outlet are processed into a standard KF vacuum interface shape, so that the rapid assembly and the disassembly are convenient.
Semicircular grooves are formed in the inner sides of the two ends of the sealing cover 2, and O-shaped rings 8 are arranged in the grooves at the two ends of the sealing cover 2 and provide circumferential sealing for liquid nitrogen.
Be provided with fixing device outside the sealed cowling 2, fixing device include stainless steel clamp 3 and bolt 6, two sets of stainless steel clamp 3 centre gripping are in the outside of sealed cowling 2, fix sealed cowling 2 in butt weld pipeline 1's welding seam region 9 through bolt 6, apply certain pretightning force and make the sealed cowling 2's of axial seal region 7 reach the complete laminating under the pressurized to provide certain sealed effect to axial seal region 7.
The low-temperature sealing O-shaped ring 8 is made of a polytetrafluoroethylene elastic belt; the sealing cover 2 can be made of epoxy resin or polytetrafluoroethylene and other materials with excellent heat insulation performance so as to reduce radial heat transfer of the testing device; the sealing cap 2 should have a sufficient wall thickness to ensure rigidity.
The sealing cover 2 is used for wrapping a welding seam area 9 of the butt welding seam pipeline 1, the inner diameter of two ends of the sealing cover 2 is matched with the outer diameter of the butt welding seam pipeline 1, and annular sealing is realized by matching with the O-shaped ring 8; the axial dimension of the sealing cover is matched according to the width of the welding line, so that the welding line area can be completely wrapped in the sealing area, and the welding line is placed in the middle of the sealing area during assembly, so that the optimal cooling effect is achieved.
And fixing the thermocouple on the outer wall of the metal pipe on two sides of the sealing cover by using a polyimide adhesive tape, and when the measured temperature is constant at a certain expected value within a plurality of minutes, the welding seam is considered to be fully cooled, wherein the expected temperature value is related to the pipe diameter, the wall thickness, the width of the sealing cover and the like.
Liquid nitrogen is injected into the thermal shock testing device at a proper flow rate, and the looseness of the sealing part of the device caused by the vibration of a pipeline caused by overlarge flow rate is avoided in the testing process. And when the reading of the thermocouple reaches an expected value, closing the liquid nitrogen valve, and after the liquid nitrogen in the device completely flows out from the outlet, sequentially disassembling the thermal shock testing device and placing the thermal shock testing device in normal-temperature water for returning the temperature.
Through this testing arrangement, guaranteed the safety of personnel and equipment in the test procedure, improved efficiency of software testing through the mode that reduces the heat exchange. The whole set of device is composed of common materials and standard components, is simple and quick to install and disassemble, and can efficiently and safely complete the low-temperature thermal shock test of the butt-joint welding line of the pipeline under the temperature of liquid nitrogen.
Claims (9)
1. The utility model provides a liquid nitrogen thermal shock testing arrangement of metal pipeline butt weld which characterized in that: the device comprises a sealing container and a fixing device, wherein the sealing container is placed outside a pipeline welding line area of a butt welding line pipeline and provides sealing for liquid nitrogen in a thermal shock test area, and the fixing device is used for installing the sealing container in the pipeline welding line area.
2. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 1, characterized in that: the sealed container comprises a sealing cover, the sealing cover comprises two semicircular sealing covers, the two semicircular sealing covers wrap the outside of a welding line area of the butt welding line pipeline, and a cavity is formed between the sealing cover and the butt welding line pipeline.
3. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 2, characterized in that: one end of the sealing cover is provided with a liquid nitrogen inlet, and the other end of the sealing cover is provided with a liquid nitrogen outlet.
4. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 3, characterized in that: and the liquid nitrogen inlet and the liquid nitrogen outlet are respectively connected with a liquid nitrogen corrugated pipe.
5. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 2, characterized in that: the inner sides of the two ends of the sealing cover are provided with semicircular grooves, and the O-shaped rings are arranged in the grooves at the two ends of the sealing cover.
6. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 2, characterized in that: and a fixing device is arranged outside the sealing cover.
7. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 6, wherein: the fixing device comprises stainless steel clamps and bolts, the two groups of stainless steel clamps are clamped outside the sealing cover, and the sealing cover is fixed in a welding seam area of the butt welding seam pipeline through the bolts.
8. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in claim 5, characterized in that: the low-temperature sealing O-shaped ring is made of a polytetrafluoroethylene elastic belt.
9. The liquid nitrogen thermal shock testing device for the butt weld of the metal pipes as claimed in any one of claims 2 to 8, wherein: the sealing cover is made of epoxy resin or polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010579596.0A CN113834841A (en) | 2020-06-23 | 2020-06-23 | Liquid nitrogen thermal shock testing device for butt welding seam of metal pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010579596.0A CN113834841A (en) | 2020-06-23 | 2020-06-23 | Liquid nitrogen thermal shock testing device for butt welding seam of metal pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN113834841A true CN113834841A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010579596.0A Pending CN113834841A (en) | 2020-06-23 | 2020-06-23 | Liquid nitrogen thermal shock testing device for butt welding seam of metal pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459698A (en) * | 2021-12-29 | 2022-05-10 | 中国原子能科学研究院 | Leak detection tool and leak detection method |
-
2020
- 2020-06-23 CN CN202010579596.0A patent/CN113834841A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459698A (en) * | 2021-12-29 | 2022-05-10 | 中国原子能科学研究院 | Leak detection tool and leak detection method |
| CN114459698B (en) * | 2021-12-29 | 2023-08-18 | 中国原子能科学研究院 | Leak detection tool and leak detection method |
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