CN109100428B - Preparation method for simulating hole defects of nuclear safety 3-level HDPE (high-density polyethylene) pipeline - Google Patents
Preparation method for simulating hole defects of nuclear safety 3-level HDPE (high-density polyethylene) pipeline Download PDFInfo
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- CN109100428B CN109100428B CN201811087095.XA CN201811087095A CN109100428B CN 109100428 B CN109100428 B CN 109100428B CN 201811087095 A CN201811087095 A CN 201811087095A CN 109100428 B CN109100428 B CN 109100428B
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Abstract
The invention relates to the technical field of detection, evaluation and authentication, and provides a preparation method for simulating hole defects of a nuclear safety 3-level HDPE pipeline, which comprises the following steps: s1, selecting a test pipeline, and obtaining the backfill amount L of the pipeline defect position after the test pipeline is welded; s2, selecting a simulation pipeline, and marking a plurality of positions on the simulation pipeline for manufacturing the simulation hole defects; s3, drilling holes at a plurality of marked positions to obtain simulated holes, wherein the depth of each simulated hole is greater than the backfill amount L; and S4, welding the ends of the two simulated pipelines with the simulated holes with each other, or welding the end of the simulated pipeline with the simulated holes with the normal pipeline to form the simulated joint with the hole defect. When the size and the position of the hole defect in the simulated joint can be accurately detected by adopting an ultrasonic nondestructive detection method, the detection method is high in detection precision, so that the hole defect in the pipeline joint in construction can be accurately detected, and the HDPE pipeline construction has the advantages of quality guarantee and high safety.
Description
Technical Field
The invention relates to the technical field of detection, evaluation and authentication, and particularly provides a preparation method for simulating hole defects of a nuclear safety 3-level HDPE pipeline.
Background
At present, before ultrasonic nondestructive testing of metal materials, a standard test block is generally adopted to calibrate the detection precision, a plurality of through holes with different specifications are drilled on the standard test block, and the positions of the through holes on the standard test block are known. However, for HDPE (High Density Polyethylene) materials, the conventional ultrasonic non-destructive testing method is not suitable for the HDPE materials, and no corresponding HDPE standard test block exists.
When HDPE pipelines are laid, the HDPE pipelines are mainly connected by a welding method, and small hole defects may occur inside welding joints under the influence of complex factors such as pressure, temperature, time, wind speed, air humidity and the like, so that the bearing capacity of the joints is influenced, and the welding quality is reduced.
In order to ensure the internal quality of the welding joint, in recent years, the HDPE pipeline welding joint is mostly probed by an ultrasonic nondestructive testing method, the method does not damage the joint, can probe the internal area of the joint, and can directly represent the quality of welding, so that the method is a very effective means for controlling the quality of the HDPE pipeline welding joint.
The effectiveness of ultrasonic non-destructive inspection methods (or other non-destructive inspection methods) is typically verified by preparing a series of simulations containing artificial defects that are implanted in a controlled manner, with the size and location of the defects accurately known in advance. When the nondestructive testing technology and process need to be verified, a simulation piece with a corresponding specification can be selected, complete nondestructive testing operation is carried out on the simulation piece, the size and the position condition of the detected defect are fed back, and the effectiveness and the precision of the nondestructive testing technology and process can be determined by comparing the information of the defect in the simulation piece which is known in advance. Therefore, the preparation of the simulation part containing the artificial defects has important significance for judging the effectiveness of the nondestructive testing technology, can ensure the detection precision during the detection of the pipeline in site construction, accurately reflects the welding quality, and is a very important link for the welding quality control of the HDPE pipeline.
In the welding defects of HDPE pipelines, the hole artificial simulation defect is difficult to prepare, the preparation difficulty of the hole defect lies in the dimension control, and in the welding operation, the pipeline joint is formed through a plurality of links such as heating, extruding, curling and the like, so that when the defect simulation piece is prepared, the dimension and the position of the artificial defect in the joint can be kept unchanged after the heating and the extruding are finished.
However, the prior art does not ensure that a hole of a certain size must be present at a certain location of the fusion splice.
Disclosure of Invention
The invention aims to provide a preparation method of a simulated hole defect of a nuclear safety 3-grade HDPE pipeline, and aims to solve the technical problem that the size and the position of the hole defect are uncertain when HDPE pipelines are welded in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a simulated hole defect of a nuclear safety 3-level HDPE pipeline comprises the following steps:
s1, selecting a test pipeline, and obtaining the backfill amount L of the test pipeline at the welded pipeline defect position;
s2, selecting a simulation pipeline, and marking a plurality of positions on the simulation pipeline for manufacturing the simulation hole defects;
s3, drilling holes at a plurality of marked positions simulating hole defects to obtain simulated holes, wherein the depth of each simulated hole is larger than the value of the backfill amount L;
s4, welding the ends of the two simulation pipelines with the simulation holes to form a simulation joint with hole defects; or welding one end of the simulation pipeline with the simulation hole with the normal pipeline to form the simulation joint with the hole defect.
Further: the S1 includes the steps of:
s11, selecting a test pipeline, and drilling a plurality of blind holes with the depth of L1 on one end face of the test pipeline;
s12, welding one end of the test pipeline with the drilled blind hole with a normal pipeline to form a test joint, or welding one ends of the two test pipelines with the drilled blind holes with each other to form a test joint;
s13, cutting the test joint, and measuring the residual depth of the blind hole in the test pipeline to be L2;
and the backfill amount L is L1-L2.
Further: the L1 is more than or equal to 15 mm.
Further: before the step S11, it was confirmed that the end face of the test tube was perpendicular to the axis of the test tube. .
Further: the depth of the simulated hole is equal to the sum of the aperture of the simulated hole and the backfill amount L.
Further: the depth of the simulation hole is more than or equal to 15mm
Further: the simulation holes are circumferentially and equidistantly distributed on the end face of the simulation pipeline.
Further: the plurality of simulation holes are distributed on the end face of the simulation pipeline in a cross shape.
Further: the plurality of simulation holes are distributed on the end face of the simulation pipeline in a shape of Chinese character mi.
The invention has the beneficial effects that: according to the preparation method of the simulated hole defect of the nuclear safety 3-level HDPE pipeline, provided by the invention, the size and the position of the simulated hole defect in the simulated joint can be determined in advance by pre-determining the backfill amount L and the position of the simulated hole, and when the size and the position of the simulated hole defect in the simulated joint can be detected by adopting an ultrasonic nondestructive detection method and process, the detection method and process have higher detection precision, so that the hole defect in the HDPE pipeline fusion joint in the nuclear power station project construction can be accurately detected, the construction quality is verified, and compared with the prior art, the preparation method has the advantages that the position and the size of the hole defect in the HDPE pipeline fusion joint can be determined, the construction of the HDPE pipeline has quality guarantee and the safety is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for preparing a simulated hole defect of a nuclear-safe 3-grade HDPE pipe according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a pipe end face bore in an embodiment of the present invention;
FIG. 3 is a flowchart illustrating step S1 according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a conduit of an embodiment of the present invention before fusion;
FIG. 5 is a schematic diagram of a welded conduit according to an embodiment of the present invention.
Reference numerals: 10. simulating a pipeline; 20. simulating a hole; l, backfilling amount.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
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.
In the embodiment of the invention, the backfill amount refers to a part of the hole of the HDPE pipe which is filled under the action of the extrusion force when the HDPE pipe is welded, and the part of the hole which is not filled is left as the hole defect.
Referring to fig. 1 to 5, a method for preparing a simulated hole defect of a nuclear safety class-3 HDPE pipe according to an embodiment of the present invention will now be described in detail. The preparation method of the simulated hole defect of the nuclear safety 3-level HDPE pipeline comprises the following steps:
s1, selecting a test pipeline, and obtaining the backfill amount L of the test pipeline at the welded pipeline defect position;
s2, selecting a simulation pipeline, and marking a plurality of positions on the simulation pipeline for manufacturing the simulation hole defects;
s3, drilling holes at a plurality of marked positions simulating hole defects to obtain simulated holes, wherein the depth of each simulated hole is larger than the value of the backfill amount L;
s4, welding the ends of the two simulation pipelines with the simulation holes to form a simulation joint with hole defects; or welding one end of the simulation pipeline with the simulation hole with the normal pipeline to form the simulation joint with the hole defect.
The purpose of step S1 is to confirm the backfill amount L of the test pipeline, step S2 is to determine the position of the simulated hole defect on the simulated pipeline, step S3 is to ensure that the simulated pipeline has the simulated hole defect, wherein the depth of the simulated hole defect is equal to the difference between the depth of the simulated hole and the backfill amount L, and the simulated joint formed in step S4 is used for verifying the ultrasonic nondestructive testing technology and the quality of pipeline welding.
The preparation method of the simulated hole defect of the nuclear safety 3-level HDPE pipeline provided by the invention can determine the size and the position of the simulated hole defect in the simulated joint by the pre-determination of the backfill amount L and the position of the simulated hole 20 and the confirmation of the relationship between the depth of the simulated hole 20 and the backfill amount L, and when the size and the position of the simulated hole defect in the simulated joint can be prepared to be detected by adopting an ultrasonic nondestructive detection method and process, the ultrasonic nondestructive detection method and process have higher detection precision, so that the hole defect in the HDPE pipeline welding joint in the nuclear power station project construction can be ensured to be accurately detected, the construction quality of the HDPE pipeline is verified, compared with the prior art, the position and the size of the defect in the HDPE pipeline joint can be determined by the ultrasonic nondestructive detection method and process, and the construction of the HDPE pipeline has quality guarantee, high safety.
Similarly, the preparation method of the simulated hole defect of the nuclear safety 3-level HDPE pipeline provided by the invention can also be used for verifying the qualification of workers who execute the ultrasonic nondestructive testing method and process, and the workers can be proved to have the qualification for carrying out on-site detection on the construction quality of the HDPE pipeline only if the sizes and the positions of the simulated hole defects in the simulated joint can be accurately detected according to the set requirements, so that the quality safety of the HDPE pipeline construction is effectively ensured.
Similarly, the preparation method for simulating the hole defect of the nuclear safety 3-level HDPE pipeline provided by the invention can also be used for verifying the accuracy of a pipeline welding process and welding equipment, and the welding process and the welding equipment can be proved to be good only when the size and the position of the hole defect in a welding joint are the same as those designed in advance after the pipeline is welded.
Wherein, the position of the simulation hole 20 and the aperture of the simulation hole 20 are selected and determined according to the specification or design requirement of different pipelines.
Specifically, in the present embodiment, step S1 includes the following steps:
s11, selecting a test pipeline, and drilling a plurality of blind holes with the depth of L1 on one end face of the test pipeline;
s12, welding one end of the test pipeline with the drilled blind hole with a normal pipeline to form a test joint, or welding one ends of the two test pipelines with the drilled blind holes with each other to form a test joint;
s13, cutting the test joint, and measuring the residual depth of the blind hole in the test pipeline to be L2;
wherein the backfill amount L is L1-L2; in this embodiment, the values of L, L1 and L2 are average values, so as to ensure the accuracy of the size of the void defect.
Specifically, the backfill amount L is closely related to the specification of the pipeline and the welding process parameters, so that the corresponding welding process parameters need to be set according to the selected pipeline before the backfill amount L of the pipeline is determined, and when the same pipeline is selected subsequently, the welding process parameters are also the same so as to ensure the consistency of the backfill amount L of the same pipeline after welding; the pipeline welding uses a special heating welding machine tool, the accuracy and consistency of the execution of the welding process are ensured to the maximum extent, the quality of a welding interface is effectively ensured, the end face of the pipeline is ensured to be clean, dry and oilless during welding, and relevant parameters of the pipeline welding process are widely applied in the pipeline welding field and are not stated herein.
Specifically, the method comprises the following steps: in the embodiment, L1 is larger than or equal to 15mm, and the backfill amount L of the HDPE pipeline is smaller than 15mm in the welding process, so that the backfill effect of the backfill amount L can be offset by L1, and a certain defect depth is ensured after the pipeline is welded. After the welding is finished, the joint is cut, the residual depth L2 of the blind hole is accurately measured, and the backfill amount L of the pipeline can be determined under the welding process parameters according to the change of the depth of the blind hole before and after the welding.
According to the method, the backfill amount L of each pipeline is obtained by the pipelines with different specifications under the corresponding welding process, and recorded and formed into a standard for subsequent reference use and popularization.
Specifically, before the step S11 is performed, it is confirmed that the end face of the test pipe is perpendicular to the axis of the test pipe, and this is done to ensure that the backfill amount L of each blind hole in the pipe is the same after the pipe is welded, so as to ensure the accuracy of the data.
Specifically, the method comprises the following steps: in this embodiment, the depth of the simulated hole 20 is equal to the sum of the hole diameter of the simulated hole 20 and the backfill amount L, so that after the pipeline is welded, according to the calculation formula of the backfill amount L being L1-L2, the defect diameter and the defect depth of the hole defect are equal to the hole diameter of the simulated hole, thus, in design, when the hole defect is detected by using the ultrasonic nondestructive detection technology, the detected defect diameter and defect depth data should be consistent, and when the size data of the hole defect is uniform, the data confirmation is conveniently performed when the pipeline welded joint is subjected to ultrasonic nondestructive detection, and the time is saved.
In other embodiments, the depth of the simulated holes 20 is greater than or equal to 15 mm; or the depth of the simulation hole 20 is greater than the backfill amount L and less than the sum of the simulation hole aperture and the backfill amount L; or the depth of the simulated hole 20 is greater than the sum of the bore diameter of the simulated hole 20 and the backfill L.
Specifically, a plurality of the simulation holes are circumferentially and equidistantly distributed on the end face of the simulation pipeline. The arrangement is that after the ultrasonic nondestructive testing technology is adopted to detect a hole defect in the welded joint, the positions of other hole defects can be calculated, and certainly, the distribution positions and sizes of a plurality of simulation holes are not known in advance by testing workers, so that the accuracy of data detected by the ultrasonic nondestructive testing technology can be ensured.
Specifically, a plurality of simulation holes are distributed on the end face of the simulation pipeline in a cross shape; the arrangement is convenient for determining the position of the simulated hole defect, and the time is saved; in other embodiments, the plurality of simulation holes are distributed on the end face of the simulation pipeline in a shape like a Chinese character 'mi'.
The preparation method provided by the embodiment is mainly used for manufacturing the simulation joint with the hole defects, the accuracy of the ultrasonic nondestructive testing on the internal defect detection of the welded joint is determined through the simulation joint, and the operation capability of workers for implementing the ultrasonic nondestructive testing is confirmed and checked, so that the detection accuracy during the detection of the HDPE pipeline in site construction can be ensured, the welding quality of the HDPE pipeline is accurately reflected, and the safety of the HDPE pipeline construction application is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A preparation method of simulated hole defects of a nuclear safety 3-level HDPE pipeline is characterized by comprising the following steps:
s1, selecting a test pipeline, and obtaining the backfill amount L of the test pipeline at the welded pipeline defect position; wherein, the backfill amount L is closely related to the specification of the pipeline and the welding process parameters;
s2, selecting a simulation pipeline, and marking a plurality of positions on the simulation pipeline for manufacturing the simulation hole defects;
s3, drilling holes at a plurality of marked positions simulating hole defects to obtain simulated holes, wherein the depth of each simulated hole is larger than the value of the backfill amount L;
s4, welding the ends of the two simulation pipelines with the simulation holes to form a simulation joint with hole defects; or welding one end of the simulation pipeline with the simulation hole with the normal pipeline to form a simulation joint with hole defects;
the depth of the simulated hole is equal to the sum of the aperture of the simulated hole and the backfill amount L; wherein the defect diameter and the defect depth of the hole defect are equal to the aperture of the simulated hole;
the S1 includes the steps of:
s11, selecting a test pipeline, and drilling a plurality of blind holes with the depth of L1 on one end face of the test pipeline;
s12, welding one end of the test pipeline with the drilled blind hole with a normal pipeline to form a test joint, or welding one ends of the two test pipelines with the drilled blind holes with each other to form a test joint;
s13, cutting the test joint, and measuring the residual depth of the blind hole in the test pipeline to be L2;
the backfill amount is L = L1-L2.
2. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 1, wherein the method comprises the following steps: the L1 is more than or equal to 15 mm.
3. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 2, wherein the method comprises the following steps: before the step S11, it was confirmed that the end face of the test tube was perpendicular to the axis of the test tube.
4. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 3, wherein the method comprises the following steps: the depth of the simulation hole is more than or equal to 15 mm.
5. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 1, wherein the method comprises the following steps: the simulation holes are circumferentially and equidistantly distributed on the end face of the simulation pipeline.
6. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 5, wherein the method comprises the following steps: the plurality of simulation holes are distributed on the end face of the simulation pipeline in a cross shape.
7. The method for preparing simulated hole defects of nuclear safety 3-grade HDPE pipes according to claim 5, wherein the method comprises the following steps: the plurality of simulation holes are distributed on the end face of the simulation pipeline in a shape of Chinese character mi.
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| CN112113718A (en) * | 2020-07-28 | 2020-12-22 | 中国核电工程有限公司 | Method for detecting sealing performance of nuclear power plant hole plugging by using ultrasonic method |
| CN112880924B (en) * | 2021-01-12 | 2022-09-16 | 同济大学 | Leakage point simulation system for water supply pipeline |
| CN113125229B (en) * | 2021-04-27 | 2023-06-02 | 中国石油天然气集团有限公司 | Manufacturing method of polyethylene pipe hot-melt welding joint defect simulation test block |
| CN113125228B (en) * | 2021-04-27 | 2023-01-24 | 中国石油天然气集团有限公司 | Method for manufacturing polyethylene pipe electric fusion welding joint defect nondestructive testing simulation test block |
| CN113155571B (en) * | 2021-04-27 | 2023-01-24 | 中国石油天然气集团有限公司 | Method for manufacturing non-metal pipeline body defect nondestructive testing simulation test block |
| CN113777269A (en) * | 2021-08-05 | 2021-12-10 | 上海核工程研究设计院有限公司 | Preparation method of nuclear safety 3-level HDPE nondestructive testing test block |
| CN115656445A (en) * | 2022-11-11 | 2023-01-31 | 江苏省特种设备安全监督检验研究院 | Test method for detecting typical defects of directly-buried jacket steam pipeline |
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| JP2002090306A (en) * | 2000-09-19 | 2002-03-27 | Nkk Corp | Self-diagnostic method for surface inspection device |
| JP2010014626A (en) * | 2008-07-04 | 2010-01-21 | Toshiba Corp | 3d ultrasonographic device |
| CN101393170B (en) * | 2008-10-18 | 2010-09-22 | 浙江省特种设备检验研究院 | Coupling and focusing ultrasonic detection method and detection device for polyethylene pipe hot melt butt joint |
| CN202133644U (en) * | 2011-06-28 | 2012-02-01 | 鞍钢股份有限公司 | Ultrasonic detection comparison test block |
| CN202330369U (en) * | 2011-11-18 | 2012-07-11 | 国营红阳机械厂 | Ultrasonic inspection reference test block of friction stir welding joint |
| CN203164137U (en) * | 2013-02-06 | 2013-08-28 | 嘉兴市特种设备检测院 | Microwave transmission detection device of polyethylene pipeline welding joint |
| CN203811577U (en) * | 2014-04-05 | 2014-09-03 | 国家电网公司 | Magnetic powder detection test block assembly for incomplete welding of root part of iron magnetic thin-wall pipe with wall thickness of not more than 4mm |
| CN104400182A (en) * | 2014-09-28 | 2015-03-11 | 中国海洋石油总公司 | Production method of artificial defects of pipe circumferential welding lines |
| CN108226303B (en) * | 2017-12-07 | 2020-11-17 | 中国船舶重工集团公司第七二五研究所 | Detection method of dissimilar steel electron beam welding seam ultrasonic detection test block |
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