CN109187070B - Method for obtaining small punch rod sample of in-service high-temperature high-pressure pipeline - Google Patents
Method for obtaining small punch rod sample of in-service high-temperature high-pressure pipeline Download PDFInfo
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- CN109187070B CN109187070B CN201810985554.XA CN201810985554A CN109187070B CN 109187070 B CN109187070 B CN 109187070B CN 201810985554 A CN201810985554 A CN 201810985554A CN 109187070 B CN109187070 B CN 109187070B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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Abstract
The embodiment of the invention discloses a method for obtaining a small punch test sample of an in-service high-temperature and high-pressure pipeline, which comprises the following steps of 1) determining the diameter of the small punch test sample, and selecting a hollow drill bit with a corresponding diameter; 2) determining the length of the small punch sample; 3) drilling a hole on the pipeline by adopting a magnetic drilling machine until the length of the small punch rod sample is reached, and stopping drilling to obtain the small punch rod sample to be cut; 4) brushing an insulating paint to remove a sample, pouring electric spark cutting fluid into the root of the small plunger sample to be cut, and cutting the root of the sample by adopting a portable electric spark machine and an L-shaped tungsten steel electrode until the small plunger sample can be taken down; 5) tapping on the in-service pipeline to form threads, and filling and welding and fixing by adopting bolts made of the same material. The method of the invention can not only meet the requirement of small punch rod samples, but also avoid purchasing expensive international universal electric spark sampling devices for sampling samples, thereby reducing the sampling cost.
Description
Technical Field
The invention relates to the technical field of small punch tests, in particular to a method for obtaining a small punch sample of an in-service high-temperature high-pressure pipeline.
Background
In the electric, nuclear, petrochemical and metallurgical industries, a large number of pressure-bearing devices such as in-service boilers, pressure vessels, pressure pipelines and the like exist, equipment materials can be damaged and degraded in performance to different degrees after being in service at high temperature or after being irradiated by neutrons for a long time, and how to detect and evaluate the material condition and predict the residual life is always a hotspot problem in the industries. The traditional conventional test method can only destructively cut off a pipeline to take a sample, and then test and evaluate various properties of the material, so that the method has obvious damage and destruction to the original equipment structure, is not economical, and limits the evaluation of in-service equipment. The small punch test is a new test method which is rapidly developed in recent years and can determine the material performance without damaging the whole pipeline. At present, sampling of a small plunger rod test is mainly focused on electric spark sampling, but sampling equipment is monopolized abroad, the price is over 900 ten thousand yuan, and sampling consumables are the same in ten thousand yuan every time, so that popularization and popularization of the novel experiment are seriously influenced.
Therefore, how to reduce the sampling cost is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is how to reduce sampling cost, and therefore, the present invention provides a method for obtaining a small ram sample of an in-service high temperature and high pressure pipeline.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for obtaining a small punch test sample of an in-service high-temperature high-pressure pipeline comprises the following steps:
1) determining the diameter of a small punch sample, and selecting a hollow drill bit with a corresponding diameter;
2) determining the length of the small punch sample;
3) drilling a hole on the pipeline by adopting a magnetic drilling machine until the length of the small punch rod sample is reached, and stopping drilling to obtain the small punch rod sample to be cut;
4) brushing a small plunger sample with insulating paint, pouring electric spark cutting fluid into the root of the small plunger sample to be cut, and cutting the root of the sample by adopting a portable electric spark machine and an L-shaped tungsten steel electrode until the small plunger sample can be taken down;
5) tapping the part of the small punch test on the in-service pipeline, making the part into threads, filling the part by adopting bolts made of the same material, and welding and fixing the part.
Preferably, in the method for obtaining the small-punch sample of the in-service high-temperature and high-pressure pipeline, the determining the length of the small-punch sample specifically includes:
and measuring the actual wall thickness by using an ultrasonic flaw detector to obtain the minimum required wall thickness of the in-service pipeline, wherein the difference between the actual wall thickness and the minimum required wall thickness is the length of the small punch test sample.
Preferably, in the method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline, the obtaining of the minimum required wall thickness of the in-service pipeline specifically includes:
；
wherein the content of the first and second substances,
: the minimum required wall thickness, mm, p is the calculated pressure, MPa,
the diameter of the outer diameter of the pipeline, mm,
the allowable stress, MPa,
the minimum reduction factor.
Preferably, in the method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline, the welding is argon arc welding.
Preferably, in the method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline, the welding angle height of the argon arc welding is more than or equal to 0.8 time of the diameter of the small punch test sample.
Preferably, in the method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline, the diameter of the small punch test sample is 25 mm.
According to the technical scheme, the bar of the small punch sample is taken out by adopting the magnetic drilling method and the electric spark machine, so that the requirement of the small punch sample can be met, the expensive international universal electric spark sampling device for taking the sample can be avoided, the original pipeline can be damaged to the minimum extent, the high-temperature and high-pressure pipeline is prevented from being physically damaged due to the fact that the high-temperature and high-pressure pipeline is drilled through the in-service pipeline, and the effective thickness of the high-temperature and high-pressure pipeline is guaranteed to be free of any damage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for obtaining a small ram sample of an in-service high-temperature and high-pressure pipeline according to an embodiment of the present invention.
Detailed Description
Therefore, the core of the invention is to provide a method for obtaining a small punch rod sample of an in-service high-temperature high-pressure pipeline so as to reduce the sampling cost.
The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
Referring to fig. 1, a method for obtaining a small ram sample of an in-service high-temperature high-pressure pipeline includes:
step S1, determining the diameter of the small punch sample, and selecting a hollow drill bit with a corresponding diameter; the diameter of the small punch test piece is determined according to the indentation test, and in the embodiment of the present invention, the diameter of the small punch test piece is preferably 25 mm.
Step S2, determining the length of the small plunger sample; the method for determining the length of the small plunger sample specifically comprises the following steps: and measuring the actual wall thickness by using an ultrasonic flaw detector to obtain the minimum required wall thickness of the in-service pipeline, wherein the difference between the actual wall thickness and the minimum required wall thickness is the length of the small punch test sample.
In the method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline, the obtaining of the minimum required wall thickness of the in-service pipeline specifically comprises the following steps:
；
wherein the content of the first and second substances,
: the minimum required wall thickness, mm, p is the calculated pressure, MPa,
the diameter of the outer diameter of the pipeline, mm,
the allowable stress, MPa,
the minimum reduction factor.
Step S3, drilling a hole on the pipeline by using a magnetic drilling machine until the length of the small plunger rod sample is reached, and stopping drilling to generate the small plunger rod sample to be cut;
and S4, brushing the small plunger sample with insulating paint, pouring electric spark cutting fluid into the root of the small plunger sample to be cut, and cutting the root of the sample by using a portable electric spark machine and an L-shaped tungsten steel electrode until the small plunger sample can be taken down.
And step S5, tapping the part of the in-service pipeline where the small punch test sample is taken off, making the part into threads, filling the threads by adopting bolts made of the same material, and welding and fixing the threads. The welding is argon arc welding, and the welding angle height of the argon arc welding is more than or equal to 0.8 time of the diameter of the small punch sample.
The invention adopts a magnetic drilling method and an electric spark machine to take out the bar of the small punch sample, can meet the requirement of the small punch sample, can avoid purchasing an expensive international universal electric spark sampling device for taking the sample, can also damage the original pipeline to the minimum extent, prevents the drilling through the in-service pipeline to cause the physical damage of the high-temperature and high-pressure pipeline, and ensures that the effective thickness of the pipe has no damage.
The cost that a long section pipeline caused later stage newly-purchased pipeline and welded pipe fitting is got when can avoiding traditional test material to take a sample, increases substantially work efficiency.
The sampling device can replace a conventional electric spark sampling device for sampling, the current electric spark sampling device is monopolized abroad, the price is about ten million, the efficiency is low, and the consumable material required by each sampling is more than ten thousand yuan.
Can replace magnetic drill deep hole sampling. Deep hole sample diameter has the biggest restriction (can not be greater than the trompil reinforcement and calculate the maximum diameter), and the integrality in the pipeline thickness direction is destroyed simultaneously in the deep hole sample, is difficult to be accepted by the power plant's special worker, influences the popularization of new technology.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for obtaining a small punch test sample of an in-service high-temperature high-pressure pipeline comprises the following steps:
1) determining the diameter of a small punch sample, and selecting a hollow drill bit with a corresponding diameter;
2) determining the length of the small punch sample;
3) drilling a hole on the pipeline by adopting a magnetic drilling machine until the length of the small punch rod sample is reached, and stopping drilling to obtain the small punch rod sample to be cut;
4) brushing a small plunger sample with insulating paint, pouring electric spark cutting fluid into the root of the small plunger sample to be cut, and cutting the root of the sample by adopting a portable electric spark machine and an L-shaped tungsten steel electrode until the small plunger sample can be taken down;
5) tapping the part of the small punch test on the in-service pipeline, making the part into threads, filling the part by adopting bolts made of the same material, and welding and fixing the part.
2. The method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline according to claim 1, wherein the determining of the length of the small punch test sample specifically comprises:
and measuring the actual wall thickness by using an ultrasonic flaw detector to obtain the minimum required wall thickness of the in-service pipeline, wherein the difference between the actual wall thickness and the minimum required wall thickness is the length of the small punch test sample.
3. The method for obtaining the small ram sample of the in-service high-temperature and high-pressure pipeline according to claim 2, wherein the obtaining of the minimum required wall thickness of the in-service pipeline specifically comprises:
；
wherein the content of the first and second substances,
: the minimum required wall thickness, mm, p is the calculated pressure, MPa,
the diameter of the outer diameter of the pipeline, mm,
the allowable stress, MPa,
the minimum reduction factor.
4. The method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline according to claim 1, wherein the welding is argon arc welding.
5. The method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline as claimed in claim 4, wherein the welding angle height of the argon arc welding is more than or equal to 0.8 time of the diameter of the small punch test sample.
6. The method for obtaining the small punch test sample of the in-service high-temperature and high-pressure pipeline according to claim 1, wherein the diameter of the small punch test sample is 25 mm.
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| JP2001079658A (en) * | 1999-09-17 | 2001-03-27 | Mitsubishi Heavy Ind Ltd | Method and device for sampling of nozzle weld zone |
| WO2007105308A1 (en) * | 2006-03-14 | 2007-09-20 | Minatogawa Kinzoku Test Piece Manufacturing Co., Ltd. | Material piece scooping device |
| CN101308063A (en) * | 2008-07-16 | 2008-11-19 | 华东理工大学 | On-service equipment micro- test sample electro-spark wire cutting sampling apparatus |
| CN102419266A (en) * | 2010-09-27 | 2012-04-18 | 华东理工大学 | Microsample sampling system based on sinker EDM (Electric Discharge Machining) principle |
| CN108267334A (en) * | 2018-01-29 | 2018-07-10 | 国电锅炉压力容器检验中心 | The sampling method of sample |
| CN108332988A (en) * | 2018-02-28 | 2018-07-27 | 国电锅炉压力容器检验中心 | A kind of sampler for small punch test |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001079658A (en) * | 1999-09-17 | 2001-03-27 | Mitsubishi Heavy Ind Ltd | Method and device for sampling of nozzle weld zone |
| WO2007105308A1 (en) * | 2006-03-14 | 2007-09-20 | Minatogawa Kinzoku Test Piece Manufacturing Co., Ltd. | Material piece scooping device |
| CN101308063A (en) * | 2008-07-16 | 2008-11-19 | 华东理工大学 | On-service equipment micro- test sample electro-spark wire cutting sampling apparatus |
| CN102419266A (en) * | 2010-09-27 | 2012-04-18 | 华东理工大学 | Microsample sampling system based on sinker EDM (Electric Discharge Machining) principle |
| CN108267334A (en) * | 2018-01-29 | 2018-07-10 | 国电锅炉压力容器检验中心 | The sampling method of sample |
| CN108332988A (en) * | 2018-02-28 | 2018-07-27 | 国电锅炉压力容器检验中心 | A kind of sampler for small punch test |
Non-Patent Citations (2)
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| Nondisruptive Material Sampling and Mechanical Testing;J. R. Foulds et al.;《Journal of Nondestructive Evaluation》;19961231;第15卷(第3/4期);第151-162页 * |
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Address after: 102209 room 9607, 6th floor, building 309, Guodian new energy technology research, North District, future science and Technology City, Changping District, Beijing Patentee after: Guoneng boiler and Pressure Vessel Inspection Co.,Ltd. Address before: No. 2096, Beijing New Energy Technology Research Institute Patentee before: GUODIAN BOILER AND PRESSURE VESSEL INSPECTION Co.,Ltd. |