CN108562616A - A kind of outer detection method of natural gas line - Google Patents
A kind of outer detection method of natural gas line Download PDFInfo
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- CN108562616A CN108562616A CN201810040775.XA CN201810040775A CN108562616A CN 108562616 A CN108562616 A CN 108562616A CN 201810040775 A CN201810040775 A CN 201810040775A CN 108562616 A CN108562616 A CN 108562616A
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- natural gas
- gas line
- soil
- detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
Abstract
A kind of outer detection method of natural gas line, includes the following steps：Detect position and the buried depth of natural gas line；The extent of damage for detecting the erosion resistant coating of natural gas line outer surface calculates the insulation resistivity of erosion resistant coating, forms erosion resistant coating quality record；The protection potential of the cathodic protection system of natural gas line is detected, cathodic protection potential record is formed；The stray electrical current on natural gas line surface is detected, stray electrical current record is formed；The soil environment of natural gas line location is detected, including soil resistivity detection, soil redox potential detection and the detection of P in soil H values, forms Soil K+adsorption record；According to the record material acquired, natural gas line is safeguarded accordingly.The present invention is easy to operate, and detection accuracy is high, is conducive to the upkeep operation of pipeline.
Description
Technical field
The present invention relates to detection methods outside a kind of natural gas line.
Background technology
Natural gas line is typically to be embedded in underground, is used for delivery of fuel gas.During prolonged use, due to ground end
Wetness, and other corrosive elements often cause corrosivity to damage gas pipeline.Therefore, it is necessary to combustion gas
Pipeline carries out necessary maintenance.And detection operation is just extremely important, can accurately detect a certain position hair of gas pipeline
Corrosion damage is given birth to, it will be able to timely and effectively take countermeasure, avoid causing the industrial accidents such as gas leakage, improve combustion gas
The safety of pipeline.
Invention content
Easy to operate the technical problem to be solved in the present invention is to provide detection method outside a kind of natural gas line, detection is accurate
True property is high, is conducive to the upkeep operation of pipeline.
In order to solve the above-mentioned technical problem, the present invention takes following technical scheme：
A kind of outer detection method of natural gas line, includes the following steps：
Detect position and the buried depth of natural gas line；
The extent of damage for detecting the erosion resistant coating of natural gas line outer surface calculates the insulation resistivity of erosion resistant coating, forms erosion resistant coating
Quality record；
The protection potential of the cathodic protection system of natural gas line is detected, cathodic protection potential record is formed；
The stray electrical current on natural gas line surface is detected, stray electrical current record is formed；
The soil environment of natural gas line location is detected, including soil resistivity detection, redox of soil electricity
Position detection and the detection of P in soil H values, form Soil K+adsorption record；
According to the record material acquired, natural gas line is safeguarded accordingly.
The detection that the insulation resistivity of the erosion resistant coating of natural gas line is carried out using PCM+ electric current surveying instruments is calculated, and interval is set
Set a distance carries out taking detection, if the current attenuation logarithm of sampled point is more than setting value, by this location point labeled as abnormal
Point.
Stray electrical current test is carried out using SCM dynamic stray current detecting instruments when the progress stray electrical current detection, is confirmed
Stray electrical current size.
When the progress soil environment detection, a soil environment detection is carried out every pre-determined distance, using equidistant four
Electrode method ground resistance measuring instrument measures the ground resistance of soil, and calculates soil resistivity by the ground resistance of measurement.
The oxidation-reduction potential and acid-base value of soil are measured using digital display type platinum electrode, and according to oxidation-reduction potential
To judge soil corrosivity.
The present invention is directly detected the natural gas line for being embedded in underground from ground, easy to operate, can be timely
Attended operation effectively is carried out to natural gas line, it is ensured that the safety and reliability of conveying.
Description of the drawings
Attached drawing 1 is flow diagram of the present invention.
Specific implementation mode
For that can further appreciate that the feature, technological means and the specific purposes reached, function of the present invention, with reference to
Present invention is further described in detail with specific implementation mode for attached drawing.
As shown in Fig. 1, present invention is disclosed detection method outside a kind of natural gas line, include the following steps：
Detect position and the buried depth of natural gas line.Detect all characteristic points of steel gas pipe underground（Anode packet, inflection point, goes out at threeway
It buries a little etc.）Position and buried depth, rectilinear duct section is at a certain distance（About 30 meters）Measure the buried depth of a pipeline point；To visiting
Mark label is carried out, convenient for searching in the position for measuring all characteristic points of steel gas pipe underground with paint on ground.
The extent of damage for detecting the erosion resistant coating of natural gas line outer surface calculates the insulation resistivity of erosion resistant coating, is formed anti-
Rotten layer quality record.
The protection potential of the cathodic protection system of natural gas line is detected, cathodic protection potential record is formed.
The stray electrical current on natural gas line surface is detected, stray electrical current record is formed.
The soil environment of natural gas line location is detected, including soil resistivity detection, Soil oxidation are also
Former current potential detects and the detection of P in soil H values, forms Soil K+adsorption record；
According to the record material acquired, natural gas line is safeguarded accordingly, reaches piping foundation condition and then carries out
It replaces, it is only necessary to which repair then repairs.
The detection that the insulation resistivity of the erosion resistant coating of natural gas line is carried out using PCM+ electric current surveying instruments is calculated, and interval is set
Set a distance（Usually 30 meters）It carries out taking detection, if the current attenuation logarithm of sampled point is more than setting value, by this position
Point is labeled as abnormal point.According to the testing result of insulation resistivity, it is marked according to the credit rating of setting.For sampling away from
From, generally 30 meters, if encountering barrier, can be appropriately extended, but extension obtain data should establish in current attenuation logarithm
Under the premise of not mutating, if data mutate, means should be taken to shorten sample point, and judge abnormal point using A cabinet frames
Position.Judge that the step distance of breaking point position generally takes 10 meters using A cabinet frames, be gradually shortened if noting abnormalities, until looking for
To breaking point position.Paint spray cans mark position at the scene is used in combination, while making writing record in record form, content is mileage
（Or relative position）, current attenuation logarithm.
Stray electrical current test is carried out using SCM dynamic stray current detecting instruments when the progress stray electrical current detection, is confirmed
Stray electrical current size.If there are stray electrical current, the size of stray electrical current is evaluated, and records the stray electrical current to natural gas tube
The influence in road.
When the progress soil environment detection, a soil environment detection is carried out every pre-determined distance, using equidistant four
Electrode method ground resistance measuring instrument measures the ground resistance of soil, and calculates soil resistivity by the ground resistance of measurement.It adopts
The oxidation-reduction potential and acid-base value of soil are measured with digital display type platinum electrode, and soil is judged according to oxidation-reduction potential
Corrosivity.
It should be noted that these are only the preferred embodiment of the present invention, it is not intended to restrict the invention, although ginseng
According to embodiment, invention is explained in detail, for those skilled in the art, still can be to aforementioned reality
The technical solution recorded in example is applied to modify or equivalent replacement of some of the technical features, but it is all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (5)
1. a kind of outer detection method of natural gas line, includes the following steps：
Detect position and the buried depth of natural gas line；
The extent of damage for detecting the erosion resistant coating of natural gas line outer surface calculates the insulation resistivity of erosion resistant coating, forms erosion resistant coating
Quality record；
The protection potential of the cathodic protection system of natural gas line is detected, cathodic protection potential record is formed；
The stray electrical current on natural gas line surface is detected, stray electrical current record is formed；
The soil environment of natural gas line location is detected, including soil resistivity detection, redox of soil electricity
Position detection and the detection of P in soil H values, form Soil K+adsorption record；
According to the record material acquired, natural gas line is safeguarded accordingly.
2. the outer detection method of natural gas line according to claim 1, which is characterized in that using PCM+ electric currents surveying instrument into
The detection of the insulation resistivity of the erosion resistant coating of row natural gas line calculates, and interval setpoint distance carries out taking detection, if sampled point
Current attenuation logarithm be more than setting value, then by this location point be labeled as abnormal point.
3. the outer detection method of natural gas line according to claim 2, which is characterized in that the progress stray electrical current detection
Shi Caiyong SCM dynamic stray current detecting instruments carry out stray electrical current test, confirm stray electrical current size.
4. the outer detection method of natural gas line according to claim 3, which is characterized in that the progress soil environment detection
When, a soil environment detection is carried out every pre-determined distance, soil is measured using equidistant four electrode method ground resistance measuring instrument
Ground resistance, and pass through the ground resistance of measurement calculate soil resistivity.
5. the outer detection method of natural gas line according to claim 4, which is characterized in that use digital display type platinum electrode
The oxidation-reduction potential and acid-base value of soil are measured, and soil corrosivity is judged according to oxidation-reduction potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810040775.XA CN108562616A (en) | 2018-01-16 | 2018-01-16 | A kind of outer detection method of natural gas line |
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| CN201810040775.XA CN108562616A (en) | 2018-01-16 | 2018-01-16 | A kind of outer detection method of natural gas line |
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| CN108562616A true CN108562616A (en) | 2018-09-21 |
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| CN201810040775.XA Pending CN108562616A (en) | 2018-01-16 | 2018-01-16 | A kind of outer detection method of natural gas line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654379A (en) * | 2019-01-18 | 2019-04-19 | 陕西泰诺特检测技术有限公司 | A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method |
| CN109813764A (en) * | 2018-12-18 | 2019-05-28 | 中国石油天然气股份有限公司 | The evaluation method and device of through section pipeline anticorrosion coating insulation performance |
| CN115747811A (en) * | 2022-11-29 | 2023-03-07 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hotspot targeted protection field test method, implementation method and system |
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| CN103344548A (en) * | 2013-07-13 | 2013-10-09 | 北京工业大学 | System for testing stray current corrosion of buried steel pipeline under function of tensile stress |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813764A (en) * | 2018-12-18 | 2019-05-28 | 中国石油天然气股份有限公司 | The evaluation method and device of through section pipeline anticorrosion coating insulation performance |
| CN109654379A (en) * | 2019-01-18 | 2019-04-19 | 陕西泰诺特检测技术有限公司 | A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method |
| CN115747811A (en) * | 2022-11-29 | 2023-03-07 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hotspot targeted protection field test method, implementation method and system |
| CN115747811B (en) * | 2022-11-29 | 2023-05-23 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hot spot targeting protection field test method, implementation method and system |
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Application publication date: 20180921 |
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