CN114235300A - Helium accumulation holding box and detection method thereof - Google Patents
Helium accumulation holding box and detection method thereof Download PDFInfo
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- CN114235300A CN114235300A CN202111571872.XA CN202111571872A CN114235300A CN 114235300 A CN114235300 A CN 114235300A CN 202111571872 A CN202111571872 A CN 202111571872A CN 114235300 A CN114235300 A CN 114235300A
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- helium
- hoop
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- welding seam
- pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/225—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for welds
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- Examining Or Testing Airtightness (AREA)
Abstract
A helium accumulation holding box comprises an annular hoop, the hoop is sleeved at a welding seam of a detected pipe, the hoops are fixedly connected together by using a detachable fastener, the annular hoop completely covers the welding seam on the detected pipe, helium is filled into a pipe cavity of the detected pipe, and the pressure is maintained for a period of time. During pressure maintaining, if the welding seam has a penetrating defect, mixed gas with helium in the tube cavity leaks to a gas chamber formed between the outer surface of the detected tube and the inner surface of the hoop under the action of pressure difference, and the concentration of the helium in the gas chamber is detected by the gun head of the suction gun through the detection hole. In helium leak detection aiming at judging whether a pipe butt welding seam has a penetration defect, the tool is used, and a suction gun accumulation method process is adopted, so that compared with a vacuum tool, the tool is quicker and more convenient to install, the detection process is simpler and easier, the detection efficiency is improved by times, and the tool is low in manufacturing cost and can be reused.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to a helium accumulation holding box for helium testing by a pipe butt weld gun suction method and a detection method thereof.
Background
The helium detection technology of the butt weld of the pipe can adopt a vacuum method or a suction gun method. The vacuum method is to fill helium gas into the tube cavity of the tube to be detected, use a prefabricated sealing gas box with extremely high sealing performance to cover the welding seam, and then vacuumize the gas box for leak detection to judge whether the welding seam has a penetrating defect. The vacuum method has high requirement on the sealing performance of the sealing box, high manufacturing difficulty, high manufacturing cost and low detection efficiency, and the detection time of each welding line is 1-2 minutes, so the method is not suitable for or cannot meet the high-efficiency detection requirement of a large number of welding lines in the product welding stage or in-service detection stage. The suction gun method can be divided into a suction gun direct inspection method and a suction gun cumulative inspection method. The suction gun direct inspection method is characterized in that after helium is filled into the tube cavity of a pipe to be inspected, the suction gun is directly used for scanning the outer surface of a welding seam, when the scanning is performed, the probe nozzle and the welding seam are kept within 3mm, and the scanning of the welding seam to be inspected is not more than the speed of detecting leakage of a calibration leak hole, so that the requirement on inspection personnel is high, the inspection efficiency is low, the sensitivity is relatively low, the leakage inspection is easy, the interference of helium flow floating in the air is easy, and the inspection result is influenced. The suction gun accumulation inspection method comprises the steps of filling helium into a tube cavity of a tube to be inspected, covering a welding line by using a pre-manufactured helium collecting container (a plastic bag is commonly used), keeping for a certain time, then placing a suction gun into the helium collecting container, and comparing whether the helium concentration in the helium collecting container changes at the front time point and the back time point to determine whether the welding line has a penetrating defect. The helium leakage detection process by the suction gun accumulation method is relatively simple in operation and reliable in result qualification, but a large number of pipe butt welds which cannot be directly sheathed on products due to structural reasons can only be encircled on the welds in an encircling mode after being cut by the film bags because the plastic film bags are used, and corresponding sealing measures are adopted, so that the operation becomes complicated and inefficient, and the film is easy to break and cannot be reused.
Disclosure of Invention
The invention aims to provide a helium accumulation holding box for helium detection by a pipe butt weld gun suction method and a detection method thereof, which can be used for rapidly and conveniently judging whether a penetration defect exists in a pipe butt weld or not, improve the detection efficiency and repeatedly use the helium accumulation holding box.
In order to achieve the purpose, the invention provides a helium gas accumulation holding box which comprises an anchor ear, wherein the anchor ear is annular, at least one opening is formed in the anchor ear, and the anchor ear completely wraps a welding seam on a pipe to be detected.
The staple bolt contains two semicircle rings that the symmetry set up, two the welding seam on the pipe is surveyed in the complete parcel of semicircle ring.
The anchor ear is made of rubber.
Ear convex structures are arranged on the outer sides of the end parts of the hoops, which are in mutual contact.
The thickness of the hoop is 2 mm-3 mm.
The height of the hoop is 3-10 mm more than the width of the detected welding line.
The helium accumulation holding box comprises at least one detachable fastener, and the fastener is sleeved on the lug structure to fixedly connect the hoops together.
The detachable fastener adopts a rubber band or a clip.
The helium accumulation holding box comprises a detection hole which is arranged on the hoop and used for accommodating a gun head of a suction gun.
The invention provides a method for carrying out pipe butt welding seam gun suction method helium detection by using a helium accumulation holding box, wherein a hoop is sleeved at the welding seam of a detected pipe, and the hoops are fixedly connected together by using a detachable fastener, so that the circular hoop completely wraps the welding seam on the detected pipe; filling helium into the tube cavity of the detected tube, and maintaining the pressure for a period of time; during pressure maintaining, if the welding seam has a penetrating defect, mixed gas with helium in the tube cavity leaks to a gas chamber formed between the outer surface of the detected tube and the inner surface of the hoop under the action of pressure difference, and the concentration of the helium in the gas chamber is detected by the gun head of the suction gun through the detection hole.
In helium leak detection aiming at judging whether a pipe butt welding seam has a penetrating defect, compared with a vacuum tool, the tool adopting a suction gun accumulation method process is used for being installed more quickly and conveniently, so that the detection process is simpler and the detection efficiency is improved exponentially, and in addition, the tool is low in manufacturing cost and can be used repeatedly.
Drawings
FIG. 1 is a schematic structural view of a helium gas accumulation clasp box in one embodiment of the invention.
FIG. 2 is a schematic structural diagram of a helium gas accumulation clasp box in another embodiment of the invention.
FIG. 3 is a schematic view of the use of the helium gas accumulation hug box of the present invention.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 3.
The invention aims to design and manufacture a tool which is reliable in coating welding line, reusable and low in cost to replace a film bag, and achieve the purposes of simple operation and high detection efficiency (the detection time of a single welding line only needs about 10 seconds).
In one embodiment of the present invention, as shown in fig. 1, a helium gas accumulation holding box is provided, which is used for helium detection by a pipe butt weld gun method, and the helium gas accumulation holding box comprises a holding hoop 1, wherein the holding hoop 1 is made of rubber, and because the rubber is cheap, the mold opening and mass production are easy. The hoop 1 comprises a first hoop 1-1 and a second hoop 1-2 which are symmetrically arranged, the first hoop 1-1 and the second hoop 1-2 are hooped around a welding seam on a detected pipe, contact surfaces of the first hoop 1-1 and the second hoop 1-2 are in tight contact, a sealing interface is formed after the first hoop 1-1 and the second hoop 1-2 are attached, the first hoop 1-1 and the second hoop 1-2 are fixedly connected together by a detachable fastener, in the embodiment, ear convex structures 4 are arranged on the first hoop 1-1 and the second hoop 1-2, ear convex structures 4 are respectively arranged at two ends encircled on the first hoop 1-1, ear convex structures 4 are respectively arranged at two ends encircled on the second hoop 1-2, and after the first hoop 1-1 and the second hoop 1-2 are hooped and contacted, the protruding structure of the ear on the first embracing ring 1-1 and the protruding structure of the ear on the second embracing ring 1-2 are also in contact, a rubber band 7 hoop can be adopted on the protruding structure 4 of the ear in contact, the helium accumulation embracing box is made of rubber materials and has elasticity, and the helium accumulation embracing box can reliably stay at any part of the pipe after slight elastic deformation is generated by the rubber band 7 hoop, so that the helium accumulation embracing box can not slide down at a welding seam, the reliable connection of the first embracing ring 1-1 and the second embracing ring 1-2 is realized, the first embracing ring 1-1 and the second embracing ring 1-2 form a complete ring, and the welding seam on the detected pipe is wrapped by the ring. The size and the shape of the first embracing ring 1-1 and the second embracing ring 1-2 are consistent, the thickness T is about 2 mm-3 mm, the height H of the first embracing ring 1-1 and the second embracing ring 1-2 is adjusted along with the width of a welding seam, the first embracing ring 1-1 and the second embracing ring 1-2 can completely cover the welding seam and a proper margin (3 mm-10 mm) is reserved, more, the height H is generally about 20mm, the inner diameter of the first embracing ring 1-1 and the second embracing ring 1-2 is equal to the outer diameter of a detected pipe, therefore, the inner walls of the first embracing ring 1-1 and the second embracing ring 1-2 can be attached to the outer wall of the detected pipe, because the first embracing ring 1-1 and the second embracing ring 1-2 are made of rubber, after the first embracing ring 1-1 and the second embracing ring 1-2 embrace the detected pipe, the friction force between the first embracing ring 1-1 and the second embracing ring 1-2 and the detected pipe can overcome the gravity of the first embracing ring 1-1 and the second embracing ring 1-2, so that the hoop 1 can be stopped at any position of the detected pipe, and the position of the hoop 1 is properly adjusted so that the welding seam on the detected pipe is reliably covered by the hoop 1. The first embracing ring 1-1 and the second embracing ring 1-2 wrap a welding seam on the detected pipe, and the inner surfaces of the first embracing ring 1-1 and the second embracing ring 1-2 and the outer surface of the detected pipe form a hollow structure, namely an air chamber, so as to collect trace helium leaked from a tiny penetrating defect of the welding seam. The first embracing ring 1-1 or the second embracing ring 1-2 is provided with a detection hole 6, the detection hole 6 is a circular hole, the aperture of the detection hole 6 is slightly larger than the outer diameter of the head of the suction gun, and the head of the suction gun is inserted into the detection hole 6 so as to provide a sniffing channel for detecting the concentration of helium in the gas chamber.
In another embodiment of the present invention, as shown in fig. 2, since the rubber anchor ear 1 has a certain deformation capability, therefore, the hoop 1 can be arranged into an integral ring, and in order to sleeve the hoop 1 into the detected pipe, an opening 101 is arranged on the hoop 1, the hoop 1 can be opened along the opening 101 to form a C-shaped structure, so that the pipe to be detected is inserted into the hoop 1 from the opening 101 of the hoop 1, then reset into an holistic ring with staple bolt 1, the staple bolt 1 of opening 101 both sides contacts mutually, and the outside of the staple bolt 1 of opening 101 both sides sets up an ear protruding structure 4 respectively, utilizes the detachable fastener to be in the same place the staple bolt 1 fixed connection of opening 101 both sides, can adopt the clip to clip the ear protruding structure 4 that contacts equally, realizes reliably connecting, makes the staple bolt 1 parcel live the welding seam on being detected the pipe. The thickness T of the hoop 1 is about 2 mm-3 mm, the height H of the hoop 1 is adjusted along with the width of a welding seam, the hoop 1 can completely cover the welding seam and is left with a proper margin (3 mm-10 mm), more height H is about 20mm, and the inner diameter of the hoop 1 is equal to the outer diameter of a detected pipe. The hoop 1 wraps the welding seam on the detected pipe, and the inner surface of the hoop 1 and the outer surface of the detected pipe form a hollow structure, namely an air chamber, so as to collect trace helium leaked from the tiny penetrating defect of the welding seam. The hoop 1 is provided with a detection hole 6, the detection hole 6 is a round hole, the aperture of the detection hole 6 is slightly larger than the outer diameter of the gun head of the suction gun, and the gun head of the suction gun is inserted into the detection hole 6 so as to provide a sniffing channel for detecting the helium concentration in the air chamber.
In other embodiments, the anchor ear 1 may be made of plastic instead. Alternatively, the fastener may be secured by a nylon cable tie or the like.
As shown in fig. 3, the working principle of the present invention is as follows:
in one embodiment of the present invention, after the pipe on the workpiece 3 and the pipe on the workpiece 8 are butt-welded, a weld 5 is formed, and the helium gas accumulation holding box provided by the present invention is used to check whether the weld 5 has a welding defect. When a helium leak detection test is carried out on a butt-joint welding seam of a pipe by using a suction gun method, a first embracing ring 1-1 and a second embracing ring 1-2 are used for covering the welding seam to be detected, then the first embracing ring 1-1 and the second embracing ring 1-2 are fixed by a fastening piece, then tracer gas, namely helium, is filled into a pipe cavity of the pipe to be detected, the pressure is maintained for a period of time, during the pressure maintaining period, if the welding seam 5 has a penetrating defect, mixed gas with the helium in the pipe cavity can leak into the hoop 1 under the action of pressure difference, and a suction gun head 9 detects the concentration of the helium in a gas chamber through a detection hole 6. In this state, although there are small gaps between the interface between the pipe to be tested and the hoop 1 and the connecting surface on the hoop 1, the gaps do not affect the accumulation of helium gas possibly leaked from the hoop 1, and in addition, the hoop 1 isolates the exchange between the air chamber and the outside air, so the test result is not affected.
Compared with a direct suction gun inspection method, the helium accumulation holding box can quickly, conveniently, definitely and reliably judge whether the detected welding line is leaked or not leaked. If leakage exists, positioning a leakage point by using a suction gun direct inspection method; if no leakage occurs, the inspection of the next welding seam can be quickly switched. Compared with a suction gun accumulation inspection method using a plastic film bag as a tool for coating welding seams, the helium accumulation holding box provided by the invention has the advantages that the work of coating welding seams is quick and convenient, the holding hoop can be repeatedly used, and the environmental friendliness is improved.
It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship shown in the drawings, and are only for convenience of describing the embodiments, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The helium accumulation holding box is characterized by comprising an anchor ear, wherein the anchor ear is in a circular ring shape, at least one opening is formed in the anchor ear, and a welding seam on a detected pipe is completely wrapped by the anchor ear.
2. The helium gas accumulating clamp box of claim 1, wherein said hoop comprises two semicircular rings symmetrically arranged, and the two semicircular rings completely wrap the welding seam on the detected pipe.
3. The helium gas accumulating embracing box of claim 1 or 2, wherein the material of the hoop is rubber.
4. The helium gas accumulating embracing box of claim 1 or 2, wherein the hoops are provided with lug structures at the outer sides of the mutually contacted ends.
5. The helium cumulative embracing box of claim 1 or 2, wherein the thickness of the hoop is 2mm to 3 mm.
6. The helium gas accumulating embracing box of claim 1 or 2, wherein the height of the hoop is 3mm to 10mm more than the width of the weld to be detected.
7. The helium cumulative embracing kit of claim 4, wherein said helium cumulative embracing kit comprises at least one removable fastener, said fastener being looped over said ear convex structure to fixedly connect said anchor ears together.
8. The helium accumulating clasp of claim 8, wherein the removable fastener is a rubber band or a clip.
9. The helium gas accumulating clamp box of claim 1 or 2, wherein the helium gas accumulating clamp box comprises a detection hole which is arranged on the hoop and is used for accommodating a gun head of a suction gun.
10. The helium gas detection method by the gun suction method for the pipe butt welding seam by using the helium gas accumulation holding box as claimed in any one of claims 1 to 9, characterized in that the hoop is sleeved at the welding seam of the detected pipe, and the hoops are fixedly connected together by using a detachable fastener, so that the circular hoop completely covers the welding seam on the detected pipe; filling helium into the tube cavity of the detected tube, and maintaining the pressure for a period of time; during pressure maintaining, if the welding seam has a penetrating defect, mixed gas with helium in the tube cavity leaks to a gas chamber formed between the outer surface of the detected tube and the inner surface of the hoop under the action of pressure difference, and the concentration of the helium in the gas chamber is detected by the gun head of the suction gun through the detection hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111571872.XA CN114235300A (en) | 2021-12-21 | 2021-12-21 | Helium accumulation holding box and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111571872.XA CN114235300A (en) | 2021-12-21 | 2021-12-21 | Helium accumulation holding box and detection method thereof |
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| CN114235300A true CN114235300A (en) | 2022-03-25 |
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| CN202111571872.XA Pending CN114235300A (en) | 2021-12-21 | 2021-12-21 | Helium accumulation holding box and detection method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100931794B1 (en) * | 2008-08-21 | 2009-12-14 | 주식회사 디섹 | Lng tank leak testing method |
| CN201757696U (en) * | 2010-03-10 | 2011-03-09 | 中国科学院等离子体物理研究所 | Low temperature pipeline welding bead leak detection tool |
| CN210603768U (en) * | 2019-10-21 | 2020-05-22 | 哈电集团（秦皇岛）重型装备有限公司 | Helium mass spectrometer leak detection device for butt weld of pipe and tube |
-
2021
- 2021-12-21 CN CN202111571872.XA patent/CN114235300A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100931794B1 (en) * | 2008-08-21 | 2009-12-14 | 주식회사 디섹 | Lng tank leak testing method |
| CN201757696U (en) * | 2010-03-10 | 2011-03-09 | 中国科学院等离子体物理研究所 | Low temperature pipeline welding bead leak detection tool |
| CN210603768U (en) * | 2019-10-21 | 2020-05-22 | 哈电集团（秦皇岛）重型装备有限公司 | Helium mass spectrometer leak detection device for butt weld of pipe and tube |
Non-Patent Citations (1)
| Title |
|---|
| 杨明山;: "氦气检漏技术及其在核电管道工程中的应用", 中小企业管理与科技(上旬刊), no. 09 * |
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