CN104504274A - Pipeline index determining method and device - Google Patents
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- CN104504274A CN104504274A CN201410837199.3A CN201410837199A CN104504274A CN 104504274 A CN104504274 A CN 104504274A CN 201410837199 A CN201410837199 A CN 201410837199A CN 104504274 A CN104504274 A CN 104504274A
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- 238000012937 correction Methods 0.000 claims description 28
- 238000004210 cathodic protection Methods 0.000 claims description 26
- 230000002265 prevention Effects 0.000 claims description 8
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Abstract
The invention relates to the field of oil and gas pipeline systems, and discloses a pipeline index determining method and device, which are used for solving the technical problem that the remaining service time of a pipeline cannot be accurately determined in the prior art. The method comprises the following steps: determining the basic corrosion rate of the soil side of the pipeline; determining the effectiveness of external corrosion protection of the pipeline; determining the current corrosion rate of the pipeline according to the basic corrosion rate and the effectiveness of external corrosion protection; determining a currently available wall thickness of the pipe; the remaining service time of the pipe is determined from the current corrosion rate and the current available wall thickness. The technical effect that the residual service time of the pipeline can be determined more accurately is achieved.
Description
Technical field
The present invention relates to oil and gas pipes system regions, particularly relate to a kind of pipeline Index and device.
Background technology
Outer corrosion is the major risk factors that buried oil and gas pipes faces, and corrosion causes pipeline wall thickness thinning, and bearing capacity reduces, and along with the increase of pipeline active time, corrosion causes the accident potential such as pipe perforation to strengthen gradually.Therefore, carry out outer corrosion risk evaluation to buried oil and gas pipes, the safe operation of residual life to working pipeline of prediction buried pipeline is most important, also can optimize the maintenance maintenance strategy of pipeline simultaneously.
The outer corrosion risk evaluation of pipeline evaluates the outer corrosion condition of in-service pipeline, the residual life of assessment pipeline.Owing to there is many uncertain factors in outer corrosion risk evaluation, comprise the factors such as environment, pressure and tubing situation, the rule of development that the pipeline especially under actual working conditions corrodes outward is difficult to determine, thus outer corrosion risk appraisal difficulty is increased.
At present, the outer corrosion risk evaluation method of popular pipeline is Kent index system method, and the method affects pipeline by identification and corrodes various factors outward, forms Kent marking index system, carries out Risk Calculation.The advantage of this method is can the outer corrosion risk of Fast Evaluation pipeline, interior detection and outer detection data but the method is not combined closely, so make the method can accurately not determine the residue service time of pipeline, and the evaluation result which obtains can not corrode practical risk outward by complete reaction pipeline.
In addition, there is subjectivity in the arranging of index system of special index system method, there is subjectivity in scoring process, such as: Kent method thinks that each index system total score is all 100 points, but in actual pipeline, proportion between each index system is different, so the logical calculated between index system can make Risk Calculation occur covering and deviation.
Summary of the invention
The embodiment of the present invention provides a kind of pipeline Index and device, to solve the technical matters of the residue service time can not accurately determining pipeline in prior art.
First aspect, the embodiment of the present invention provides a kind of pipeline Index, comprising:
Determine the basic corrosion rate of pipeline soil side;
Determine the validity of the outer corrosion protection of described pipeline;
According to the validity of described basic corrosion rate and described outer corrosion protection, determine the current corrosion rate of described pipeline;
Determine the current available wall thickness of described pipeline;
The residue service time of described pipeline is determined according to described current corrosion rate and described current available wall thickness.
Optionally, the described validity determining the outer corrosion protection of described pipeline, specifically comprises:
Determine the first validity of the safeguard procedures for soil corrosion of described pipeline;
Determine the second validity of the safeguard procedures for stray current interference of described pipeline.
Optionally, described the first validity determining the safeguard procedures for soil corrosion of described pipeline, specifically comprises:
Determine the first effective value of the validity of the external anti-corrosion layer characterizing described pipeline;
Determine the second effective value of the validity of the cathodic protection characterizing described pipeline;
Effective value is had to determine described first validity according to described first effective value and described second.
Optionally, described first validity is determined according to following formula:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection);
Wherein, W
1represent described first validity;
AF
anticorrosive coatrepresent described first effective value;
AF
cathodic protectionrepresent described second effective value.
Optionally, according to the validity of described basic corrosion rate and described outer corrosion protection, determine the current corrosion rate of described pipeline, specifically comprise:
According to described basic corrosion rate and the on-site soil modifying factor of described pipeline, determine when without external anti-corrosion layer and cathode protection measure, the first foundation corrosion rate that described pipeline is corroded;
According to described basic corrosion rate and the on-site stray current modifying factor of described pipeline, determine when without stray current interference prevention safeguard measure, the second basic corrosion rate that described pipeline is corroded;
When determining only to consider soil corrosion factor according to described first validity and described first foundation corrosion rate, the first corrosion rate that described pipeline is corroded;
According to described second validity and described second basic corrosion rate, when determining only to consider stray current interference, the second corrosion rate that described pipeline is corroded;
Get maximal value in described first corrosion rate and described second corrosion rate as described current corrosion rate.
Optionally, described first corrosion rate is determined by following formula:
R
soil corrosion=R
soil correction(1-W
1);
Wherein, R
soil corrosionrepresent described first corrosion rate;
R
soil correctionrepresent described first foundation corrosion rate;
W
1represent the first validity.
Optionally, described second corrosion rate is determined by following formula:
R
stray current=R
stray current correction(1-W
2);
Wherein, R
stray currentrepresent described second corrosion rate;
R
stray current correctionrepresent described second basic corrosion rate;
W
2represent described second validity.
Optionally, the described current available wall thickness determining described pipeline, specifically comprises:
Determine the minimum permission wall thickness of working as anterior wall thickness and described pipeline of described pipeline;
Described current available wall thickness is determined when anterior wall thickness and described minimum permission wall thickness according to described.
Optionally, described current available wall thickness is determined according to following formula:
B=B
original-R
current× T
go into operation;
Wherein, B represents described and works as anterior wall thickness;
B
originalrepresent the original wall thickness of described pipeline;
R
currentrepresent current corrosion rate;
T
go into operationrepresent the time of coming into operation of described pipeline.
Optionally, described minimum permission wall thickness is determined according to following formula:
Wherein, B
allowrepresent minimum permission wall thickness;
P represents pipe operations pressure;
D represents pipe diameter;
σ represents the minimum yield strength of steel;
χ represents design ratio.
Optionally, after the described residue service time determining described pipeline according to described current corrosion rate and described current available wall thickness, described method also comprises, and determines the failure likelihood of described pipeline according to following formula:
Wherein, F expression failure likelihood;
TTF represents described residue service time.
Optionally, described determine the failure likelihood of described pipeline after, described method also comprises:
The outer corrosion risk grade of described pipeline is determined according to the failure consequence of described failure likelihood and described pipeline.
Optionally, described determine the failure likelihood of described pipeline after, described method also comprises:
Determine that the product value of the failure consequence of described failure likelihood and described pipeline is the value-at-risk of described pipeline;
With described value-at-risk be ordinate, the pipeline mileage of described pipeline determines the Risk profiles of described pipeline for horizontal ordinate.
Second aspect, the embodiment of the present invention provides a kind of pipeline index determining device, comprising:
First determination module, for determining the basic corrosion rate of pipeline soil side;
Second determination module, for determining the validity of the outer corrosion protection of described pipeline;
3rd determination module, for the validity according to described basic corrosion rate and described outer corrosion protection, determines the current corrosion rate of described pipeline;
4th determination module, for determining the current available wall thickness of described pipeline;
5th determination module, for determining the residue service time of described pipeline according to described current corrosion rate and described current available wall thickness.
Optionally, described second determination module, specifically comprises:
First determining unit, for determining the first validity of the safeguard procedures for soil corrosion of described pipeline;
Second determining unit, for determining the second validity of the safeguard procedures for stray current interference of described pipeline.
Optionally, described first determining unit, specifically comprises:
First determines subelement, for determining the first effective value of the validity of the external anti-corrosion layer characterizing described pipeline;
Second determines subelement, for determining the second effective value of the validity of the cathodic protection characterizing described pipeline;
3rd determines subelement, for having effective value to determine described first validity according to described first effective value and described second.
Optionally, the described 3rd determines subelement, for determining described first validity according to following formula:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection);
Wherein, W
1represent described first validity;
AF
anticorrosive coatrepresent described first effective value;
AF
cathodic protectionrepresent described second effective value.
Optionally, the 3rd determination module, specifically comprises:
3rd determining unit, for according to described basic corrosion rate and the on-site soil modifying factor of described pipeline, determines when without external anti-corrosion layer and cathode protection measure, the first foundation corrosion rate that described pipeline is corroded;
4th determining unit, for according to described basic corrosion rate and the on-site stray current modifying factor of described pipeline, determines when without stray current interference prevention safeguard measure, the second basic corrosion rate that described pipeline is corroded;
5th determining unit, during for determining according to described first validity and described first foundation corrosion rate only to consider soil corrosion factor, the first corrosion rate that described pipeline is corroded;
6th determining unit, for according to described second validity and described second basic corrosion rate, when determining only to consider stray current interference, the second corrosion rate that described pipeline is corroded;
7th determining unit, for getting maximal value in described first corrosion rate and described second corrosion rate as described current corrosion rate.
Optionally, the 5th determining unit, for determining described first corrosion rate by following formula:
R
soil corrosion=R
soil correction(1-W
1);
Wherein, R
soil corrosionrepresent described first corrosion rate;
R
soil correctionrepresent described first foundation corrosion rate;
W
1represent the first validity.
Optionally, the 6th determining unit, for determining described second corrosion rate by following formula:
R
stray current=R
stray current correction(1-W
2);
Wherein, R
stray currentrepresent described second corrosion rate;
R
stray current correctionrepresent described second basic corrosion rate;
W
2represent described second validity.
Optionally, the 4th determination module, specifically comprises:
8th determining unit, for determining the minimum permission wall thickness of working as anterior wall thickness and described pipeline of described pipeline;
9th determining unit, for determining described current available wall thickness according to described when anterior wall thickness and described minimum permission wall thickness.
Optionally, the 9th determining unit, for determining described current available wall thickness according to following formula:
B=B
original-R
current× T
go into operation;
Wherein, B represents described and works as anterior wall thickness;
B
originalrepresent the original wall thickness of described pipeline;
R
currentrepresent current corrosion rate;
T
go into operationrepresent the time of coming into operation of described pipeline.
Optionally, the 8th determining unit, for determining described minimum permission wall thickness according to following formula:
Wherein, B
allowrepresent minimum permission wall thickness;
P represents pipe operations pressure;
D represents pipe diameter;
σ represents the minimum yield strength of steel;
χ represents design ratio.
Optionally, described device also comprises:
Computing module, for after determine residue service time of described pipeline according to described current corrosion rate and described current available wall thickness, determine the failure likelihood of described pipeline according to following formula:
Wherein, F expression failure likelihood;
tTFrepresent described residue service time.
Optionally, described device also comprises:
6th determination module, for after the failure likelihood determining described pipeline, determines the outer corrosion risk grade of described pipeline according to the failure consequence of described failure likelihood and described pipeline.
Optionally, described device also comprises:
7th determination module, for after the failure likelihood determining described pipeline, determines that the product value of the failure consequence of described failure likelihood and described pipeline is the value-at-risk of described pipeline;
8th determination module, for be ordinate with described value-at-risk, the pipeline mileage of described pipeline determines the Risk profiles of described pipeline for horizontal ordinate.
Beneficial effect of the present invention is as follows:
In embodiments of the present invention, provide a kind of pipeline Index, comprising: determine the basic corrosion rate that pipeline is corroded, basic corrosion rate is specially: in unprotected situation, the corrosion rate that pipeline is corroded; Determine the validity of the outer corrosion protection of pipeline; According to the validity of basic corrosion rate and outer corrosion protection, determine the current corrosion rate of pipeline; Determine the current available wall thickness of pipeline; According to the residue service time of current corrosion rate and current available wall thickness determination pipeline.That is, when determining residue service time of pipeline, consider interior detection (such as: the current available wall thickness of pipeline, the basic corrosion rate of pipeline) and detected data (such as: the validity of the outer corrosion protection of pipeline) outward, thus having reached the technique effect of the residue service time can determining pipeline more accurately.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of pipeline Index in the embodiment of the present invention;
Fig. 2 is the process flow diagram of the validity of the outer corrosion protection determining pipeline in embodiment of the present invention pipeline Index;
Fig. 3 is the process flow diagram of the first validity of the safeguard procedures for soil corrosion determining pipeline in embodiment of the present invention pipeline Index;
Fig. 4 determines when without external anti-corrosion layer and cathode protection measure in embodiment of the present invention pipeline Index, the process flow diagram of the first foundation corrosion rate that pipeline is corroded;
Fig. 5 is the process flow diagram of the current available wall thickness determining pipeline in embodiment of the present invention pipeline Index;
Fig. 6 is the schematic diagram of embodiment of the present invention pipeline Index risk matrix;
Fig. 7 is the process flow diagram determining the Risk profiles of pipeline in embodiment of the present invention pipeline Index;
Fig. 8 is the schematic diagram of embodiment of the present invention pipeline Index risk matrix;
Fig. 9 is the process flow diagram of the pipeline Index of embodiment of the present invention second aspect;
Figure 10 is the structural drawing of the pipeline index determining device of the embodiment of the present invention third aspect.
Embodiment
The embodiment of the present invention provides a kind of pipeline Index and device, to solve the technical matters of the residue service time can not accurately determining pipeline in prior art.
Technical scheme in the embodiment of the present application is solve above-mentioned technical matters, and general thought is as follows:
Provide a kind of pipeline Index, comprising: determine the basic corrosion rate that pipeline is corroded, basic corrosion rate is specially: in unprotected situation, the corrosion rate that pipeline is corroded; Determine the validity of the outer corrosion protection of pipeline; According to the validity of basic corrosion rate and outer corrosion protection, determine the current corrosion rate of pipeline; Determine the current available wall thickness of pipeline; According to the residue service time of current corrosion rate and current available wall thickness determination pipeline.That is, when determining residue service time of pipeline, consider interior detection (such as: the current available wall thickness of pipeline, the basic corrosion rate of pipeline) and detected data (such as: the validity of the outer corrosion protection of pipeline) outward, thus having reached the technique effect of the residue service time can determining pipeline more accurately.
In order to better understand technique scheme, below by accompanying drawing and specific embodiment, technical solution of the present invention is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical solution of the present invention, instead of the restriction to technical solution of the present invention, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
First aspect, the embodiment of the present invention provides a kind of pipeline Index, please refer to Fig. 1, comprising:
Step S101: the basic corrosion rate determining pipeline soil side;
Step S102: the validity determining the outer corrosion protection of pipeline;
Step S103: according to the validity of basic corrosion rate and outer corrosion protection, determine the current corrosion rate of pipeline;
Step S104: the current available wall thickness determining pipeline;
Step S105: according to the residue service time of current corrosion rate and current available wall thickness determination pipeline.
In step S101, can by consulting pertinent literature and standard obtains basic corrosion rate, basic corrosion rate is such as: R
basis=0.127mm/y, can certainly be other value, the embodiment of the present invention no longer itemizes, and is not restricted.
In step S102, the protection of the outer corrosion of pipeline is mainly divided into two parts: for the safeguard procedures of soil and the safeguard procedures for stray current interference, so determine the validity of the outer corrosion protection of pipeline, please refer to Fig. 2, specifically comprise:
Step S201: the first validity determining the safeguard procedures for soil corrosion of pipeline;
Step S202: the second validity determining the safeguard procedures for stray current interference of pipeline.
As further preferred embodiment, in step S201, determine the first validity of the safeguard procedures for soil corrosion of pipeline, please refer to Fig. 3, specifically comprise the following steps:
Step S301: the first effective value determining the validity of the external anti-corrosion layer characterizing pipeline;
Step S302: the second effective value determining the validity of the cathodic protection characterizing pipeline;
Step S303: determine the first validity according to the first effective value and the second effective value.
Under normal circumstances, the safeguard procedures for soil corrosion of pipeline mainly comprise external protection coating and cathodic protection, mainly determine the validity of external anti-corrosion layer in step S301, external anti-corrosion layer validity AF
anticorrosive coatbe divided into the external anti-corrosion layer carrying out detecting and the external anti-corrosion layer do not detected two kinds of situations, be introduced respectively below.
1. for external anti-corrosion layer validity after testing, mainly through detection time validity and testing result validity revise, specific as follows:
AF
anticorrosive coat=t × q ... [1]
Wherein, AF
anticorrosive coatrepresent the first effective value, t represents validity detection time, and q represents testing result validity.
As shown in table 1, for the corresponding relation between outer corrosion layer detection time and detection time validity, as shown in table 2 is corresponding relation between outer corrosion layer testing result and testing result validity, after determining detection time, can be searched obtain validity t detection time by table 1; After determining testing result, then can be searched by table 2 and obtain testing result validity q.
Table 1 external anti-corrosion layer validity detection time
| Detection time | Detection time validity |
| Apart from modern > 8 years | 75％ |
| Apart from modern 3-8 | 85％ |
| Apart from modern < 3 years | 95％ |
Table 2 testing result validity
| Testing result | External anti-corrosion layer testing result validity |
| Good | 90％ |
| In | 50％ |
| Difference | 15%, be 90% after reparation |
| Extreme difference | 5%, be 90% after reparation |
2. for not detecting or the external anti-corrosion layer validity of testing result the unknown, by the type of anticorrosive coat, the factors such as service time, reparation situation are determined, such as, if by the type of anticorrosive coat, service time, repair situation and pipe excavation time investigation find, such as: suppose to there is anticorrosive coat Availability table as shown in table 3, and certain section of anticorrosive coat quality is for poor, so determine AF
anticorrosive coatvalue less, such as: AF
anticorrosive coat=0.15.
Table 3
Can analyze outer corrosion protection validity result of calculation by such scheme, find out the deficiency and weak link that exist in outer corrosion protection work at present, specific aim is improved and is improved.
In step S302, mainly determine the validity of cathodic protection, it mainly can be determined by following formula:
AF
cathodic protection=u × s ... [2]
Wherein, AF
cathodic protectionrepresent the second effective value, u represents cloudy frequency validity of protecting potentiometric detection, and s represents cloudy and protects potential level validity.Table 4 is the relation table of Cathode protect testing frequency validity; table 5 is the cloudy relation table protecting potential level validity; after determining Cathode protect testing frequency; just can obtain the cloudy frequency validity u protecting potentiometric detection by look-up table 4; after determining cloudy guarantor's potential level, just can obtain cloudy guarantor's potential level validity s by look-up table 5.
Table 4
Table 5
| Cloudy guarantor's potential level | The moon possesses validity s |
| 0.85V～-1.2V | 90％ |
| Overprotection | 50％ |
| Under proteciton | 20％ |
| Nothing | 1％ |
Such as: if it is 0.85-1.2v that this segment pipe the moon protects current potential, then the moon protects potential level s=0.9, and the moon protects the potentiometric detection cycle for detect on schedule, cloudy guarantor potentiometric detection cycle u=0.9, then determine that the second effective value is:
AF
cathodic protection=0.9 × 0.9=0.81 ... [3]
In step S303; for avoiding covering each other, when determining soil corrosion safeguard procedures validity, be not simply external anti-corrosion layer validity and cathodic protection validity are summed up; but adopt the relational expression of logical OR, namely determine the first validity by following formula:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection) ... [4]
Wherein, W
1represent the first validity;
AF
anticorrosive coatrepresent the first effective value;
AF
cathodic protectionrepresent the second effective value.
In step S202, second validity (also namely: stray current interference prevention validity) is determined mainly through drainage measure and quality, such as, if carry out drainage in fountain and drainage effect as well, then the value of the second validity is higher, such as: the second validity W
2=0.85.
Due in such scheme, can determine separately the protection validity of pipeline, so can find out the deficiency and weak link that exist in outer corrosion protection work at present, specific aim is improved and is improved.
In step S103, according to the validity of basic corrosion rate and outer corrosion protection, determine the current corrosion rate of pipeline, please refer to Fig. 4, specifically comprise:
Step S401: according to basic corrosion rate and the on-site soil modifying factor of pipeline, determine when without external anti-corrosion layer and cathode protection measure, the first foundation corrosion rate that pipeline is corroded;
Step S402: according to basic corrosion rate and the on-site stray current modifying factor of pipeline, determines when without stray current interference prevention safeguard measure, the second basic corrosion rate that pipeline is corroded;
Step S403: when determining only to consider soil corrosion factor according to the first validity and first foundation corrosion rate, the first corrosion rate that pipeline is corroded;
Step S404: according to the second validity and the second basic corrosion rate, when determining only to consider stray current interference, the second corrosion rate that pipeline is corroded;
Step S405: get maximal value in the first corrosion rate and the second corrosion rate as current corrosion rate.
In step S401, can by following formula determination first foundation corrosion rate:
R
soil correction=R
basis× AF
soil[5]
Wherein, R
soil correctionrepresent first foundation corrosion rate;
R
basisrepresent basic corrosion rate;
AF
soilrepresent soil modifying factor.
As shown in table 6 is AF under different soils environment
soilvalue, can be consulted by this table and obtain AF
soil.
Table 6
In step S402, the second basic corrosion rate can be determined by following formula:
R
stray current correction=R
basis× AF
stray current[6]
Wherein, R
stray current correctionrepresent the second basic corrosion rate;
R
basisrepresent basic corrosion rate;
AF
stray currentrepresent stray current modifying factor.
Due under normal circumstances, stray current interference can be divided into AC influence and DC influence, stray current modifying factor AF
stray currentalso be divided into AC influence modifying factor and DC influence modifying factor, as shown in table 7 is the value table of AC influence modifying factor, and as shown in table 8 is the value table of DC influence modifying factor.
Table 7
| Testing result | AC influence modifying factor |
| Weak | 0.15 |
| In | 1 |
| By force | 3.2 |
Table 8
| Testing result | DC influence modifying factor |
| Weak | 0.2 |
| In | 1.1 |
| By force | 5.1 |
When there is AC influence, AF can be obtained by look-up table 7
stray current; And when there is DC influence, AF can be obtained by look-up table 8
stray current.
In step S403, the first corrosion rate can be determined by following formula:
R
soil corrosion=R
soil correction(1-W
1) ... [7]
Wherein, R
soil corrosionrepresent the first corrosion rate;
R
soil correctionrepresent first foundation corrosion rate;
W
1represent the first validity.
In step S404, the second corrosion rate can be determined by following formula:
R
stray current=R
stray current correction(1-W
2) ... [8]
Wherein, R
stray currentrepresent the second corrosion rate;
R
stray current correctionrepresent the second basic corrosion rate;
W
2represent the second validity.
In step S405, current corrosion rate can be determined by following formula:
R
current=MAX (R
soil corrosion, R
stray current) ... [9]
Wherein, R
currentrepresent current corrosion rate;
R
soil corrosionrepresent the first corrosion rate;
R
stray currentrepresent the second corrosion rate.
In usual prior art, for the corrosion risk of pipeline, do not distinguish and threaten and protection, two part unifications are summed up, and when determining the current corrosion rate of pipeline in embodiments of the present invention, be but calculate these two parts respectively for threat and protection, the threat situation that such supvr suffers with regard to energy analysis conduit, and now management protection situation, thus reach more accurate technique effect is determined to the index of pipeline.
In step S104, determine the current available wall thickness of pipeline, please refer to Fig. 5, specifically comprise:
Step S501: the minimum permission wall thickness of working as anterior wall thickness and pipeline determining pipeline;
Step S502: determine current available wall thickness according to when anterior wall thickness and minimum permission wall thickness.
In step S501, first determine that anterior wall thickness worked as by pipeline, pipeline is divided into two kinds of different situations when the determination of anterior wall thickness: wall thickness is known and wall thickness unknown, the current wall-thickness measurement data of the direct application that wall thickness is known, wall thickness the unknown by following formulae discovery:
B=B
original-R
current× T
go into operation[10]
Wherein, B represents and works as anterior wall thickness;
B
originalrepresent the original wall thickness of pipeline;
R
currentrepresent current corrosion rate;
T
go into operationrepresent the time of coming into operation of pipeline.
Then the minimum permission wall thickness of pipeline is determined; Pipeline, under certain on-stream pressure, has minimum permission wall thickness B
allow, minimum permission wall thickness can be determined by following formula:
Wherein, B
allowrepresent minimum permission wall thickness;
P represents pipe operations pressure;
D represents pipe diameter;
σ represents the minimum yield strength of steel;
χ represents design ratio.
In step S502, can by the current available wall thickness of following formula determination pipeline:
B
available=B
current-B
allow[12]
Wherein, B
availablerepresent current available wall thickness, B
currentrepresent that pipeline works as anterior wall thickness, B
allowrepresent minimum permission wall thickness.
In step S105, can by the residue service time of following formulae discovery pipeline:
Wherein, TTF represent residue service time, B
availablerepresent current available wall thickness, R
currentrepresent current corrosion rate.
As further preferred embodiment, based on step S105 according to residue service time of current corrosion rate and current available wall thickness determination pipeline after, method also comprises, the failure likelihood according to following formula determination pipeline:
Wherein, F expression failure likelihood;
TTF represent residue service time.
In addition, after the failure likelihood determining pipeline, according to numerical values recited, pipeline failure possibility can be divided into 5 grades, as shown in table 9:
Table 9
| Failure likelihood | A | B | C | D | E |
| Numerical value | 0-0.1 | 0.1-0.2 | 0.2-0.3 | 0.3-0.4 | 0.4-1 |
Due in such scheme, when evaluating the failure likelihood of pipeline, making full use of the most accurately, reflecting the interior detection of the outer corrosion condition of pipeline and outer detection data the most in detail, so make the more realistic risk level of pipeline failure possibility result.
Further, outer corrosion failure possibility evaluation result is that 0-1 is interval, and evaluation result directly reflects the possibility of the outer corrosion failure of pipeline, makes result easier to understand.
As further preferred embodiment, after the failure likelihood determining pipeline, method also comprises:
According to the outer corrosion risk grade of the failure consequence determination pipeline of failure likelihood and pipeline.
In specific implementation process, pipeline failure consequence can be divided into: the impact of casualties, property loss, environmental impact, stopping transportation and reputation impact, and then according to the difference of these failure consequences, determine failure consequence grade hierarchical table, such as table 10 so:
Table 10
Then, the grade of outer corrosion risk just can be determined by failure likelihood and failure consequence, the grade of outer corrosion risk wherein can be determined by risk Metrics as shown in Figure 6, be ordinate in figure 6 with failure consequence, take failure likelihood as horizontal ordinate, determine a cell, in this cell, just comprise failure level.
Due in such scheme, when evaluating the outer corrosion risk grade of pipeline, making full use of the most accurately, reflecting the interior detection of the outer corrosion condition of pipeline and outer detection data the most in detail, so make the outer more realistic risk level of corrosion risk evaluation result of pipeline.
As further preferred embodiment, after the failure likelihood determining pipeline, please refer to Fig. 7, method also comprises:
Step S701: determine that the product value of the failure consequence of failure likelihood and pipeline is the value-at-risk of pipeline;
Step S702: take value-at-risk as ordinate, the pipeline mileage of the pipeline Risk profiles that is horizontal ordinate determination pipeline.
In step S701, the span of failure likelihood is 0 ~ 1 under normal circumstances, and the span 0 ~ 5 of failure consequence, is multiplied both and just can determines the value-at-risk of pipeline.Segmentation can be carried out to pipeline section, then calculate its value-at-risk respectively for each segmentation.
In step S702, for the corresponding value-at-risk of each segmentation, so can be ordinate with value-at-risk, with pipeline mileage for horizontal ordinate draws the Risk profiles of pipeline, such as: draw Risk profiles as shown in Figure 8.
By such scheme, the value-at-risk of each segmentation of pipeline can be determined intuitively, and then can deal with in time, in addition can according to Risk Calculation sort result, find out pipeline pipeline principal risk point, analyze risk reason, propose risk-based inspection measure targetedly.
Second aspect, the pipeline Index further understood the embodiment of the present invention to enable those skilled in the art and introduce, is introduced based on the method should be used in concrete enforcement it below.
1) combing goes out to need the data item of collection;
The required data of collecting of the outer corrosion risk evaluation of pipeline comprise: pipeline wall thickness, production time, design ratio, soil corrosion rate, external anti-corrosion layer detect data, external anti-corrosion layer quality, cathodic protection potential, Cathode protect testing, stray current disturbed condition etc.
2) index of pipeline is determined
First according to the difference of the data attribute of collected pipe-line, carrying out segmentation to pipeline section, to every segment pipe according to carrying out outer corrosion risk evaluation shown in Fig. 9, being described for certain pipeline section, there is the pipeline section attribute list shown in table 11 in this pipeline section:
Table 11
| Pipeline section attribute | Value |
| Wall thickness | 6mm |
| Pipe diameter | 500mm |
| On-stream pressure | 5MPa |
| The operation time limit | 1 |
| Design ratio | 0.72 |
| Yield strength | 415MPa |
Step S901: the basic corrosion rate of By consulting literatures determination pipeline soil side is:
R
basis=0.127mm/y ... [15]
Step S902: determine that pipeline is without corrosion rate R during any safeguard procedures
revise;
This segment pipe soil corrosion is highly corrosive, then pipeline is as follows without the corrosion rate (also first foundation corrosion rate) when external anti-corrosion layer and cathode protection measure:
R
soil correction=R
basis× AF
soil=0.127 × 3.2=0.406mm/y ... [16]
According to testing result, this segment pipe stray current is AC influence, and annoyance level is weak, then pipeline is as follows without the corrosion rate (also the second basic corrosion rate) during stray current interference prevention safeguard measure:
R
stray current correction=R
basis× AF
stray current=0.127 × 0.15=0.019mm/y ... [17]
Step S903: the validity W determining the outer corrosion protection of pipeline;
First determine pipeline external anti-corrosion layer and cloudy validity of protecting, the safeguard procedures of pipeline soil corrosion mainly contain external anti-corrosion layer and cathodic protection;
This segment pipe does not carry out external anti-corrosion layer quality testing, and by the type of anticorrosive coat, service time, investigation when repairing situation and pipe excavation find, this section of anticorrosive coat quality is for poor, and namely the first effective value is:
AF
anticorrosive coat=0.15 ... [18]
It is 0.85-1.2v that this segment pipe the moon protects current potential, then the moon guarantor potential level s=0.9, and the moon protects the potentiometric detection cycle for detect on schedule, cloudy guarantor potentiometric detection cycle u=0.9, and cathodic protection validity (being also the second effective value) is:
AF
cathodic protection=0.9 × 0.9=0.81 ... [19]
Thus the validity (being also the first validity) of pipeline external anti-corrosion layer protection is:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection)=0.839 ... [20]
Carry out drainage in fountain and drainage effect as well, then namely stray current interference prevention validity (also the second validity) is:
W
2＝0.85 …………………………[21]
Step S904: determine the current corrosion rate R of pipeline
current;
When only considering soil corrosion, the current corrosion rate of pipeline (being also the first corrosion rate) is:
R
soil corrosion=R
soil correction(1-W
1)=0.065mm/y ... [22]
When only considering stray current interference, the current corrosion rate of pipeline (being also the second corrosion rate) is:
R
stray current=R
stray current correction(1-W
2)=0.003mm/y ... [23]
The current corrosion rate of pipeline gets the maximum value of soil corrosion rate and stray current corrosion speed:
R
current=MAX (R
soil corrosion, R
stray current)=0.065mm/y ... [24]
Step S905: determine that pipeline can use wall thickness;
This segment pipe is pipeline of newly going into operation, and pipeline wall thickness is 6mm;
Then pipeline minimum permission wall thickness B is determined
allow:
After determining minimum permission wall thickness, just can determine that pipeline can use wall thickness B
available:
B
available=B
current-B
allow=6-4.18=1.82mm ... [26]
Step S906: determine pipeline residue TTF service time:
Step S907: pipeline residual life is converted to failure likelihood F by funtcional relationship:
Step S908: according to the classification of table 2 consequence, determines that pipeline failure consequence is 5.
Step S909: determine the outer corrosion risk of pipeline, risk according to Fig. 1 risk Metrics, can be projected risk Metrics by the outer corrosion risk of pipeline, also can represent according to the product of failure likelihood and failure consequence:
Wherein, R represents the value-at-risk of outer corrosion risk, and F represents failure likelihood, and C represents failure consequence.
3) interpretation of result, finds out excessive risk pipeline section, measure of advising;
According to Risk Calculation sort result, find out pipeline pipeline principal risk point, analyze risk reason, risk-based inspection measure is targetedly proposed, can analyze separately outer corrosion protection validity result of calculation, find out the deficiency and weak link that exist in outer corrosion protection work at present, specific aim is improved and is improved.
The third aspect, based on same inventive concept, the embodiment of the present invention provides a kind of pipeline index determining device, please refer to Figure 10, comprising:
First determination module 100, for determining the basic corrosion rate of pipeline soil side;
Second determination module 101, for determining the validity of the outer corrosion protection of pipeline;
3rd determination module 102, for the validity according to basic corrosion rate and outer corrosion protection, determines the current corrosion rate of pipeline;
4th determination module 103, for determining the current available wall thickness of pipeline;
5th determination module 104, for the residue service time according to current corrosion rate and current available wall thickness determination pipeline.
Optionally, the second determination module 101, specifically comprises:
First determining unit, for determining the first validity of the safeguard procedures for soil corrosion of pipeline;
Second determining unit, for determining the second validity of the safeguard procedures for stray current interference of pipeline.
Optionally, the first determining unit, specifically comprises:
First determines subelement, for determining the first effective value of the validity of the external anti-corrosion layer characterizing pipeline;
Second determines subelement, for determining the second effective value of the validity of the cathodic protection characterizing pipeline;
3rd determines subelement, for having effective value to determine the first validity according to the first effective value and second.
Optionally, the 3rd determines subelement, for determining the first validity according to following formula:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection) ... [4]
Wherein, W
1represent the first validity;
AF
anticorrosive coatrepresent the first effective value;
AF
cathodic protectionrepresent the second effective value.
Optionally, the 3rd determination module 102, specifically comprises:
3rd determining unit, for according to basic corrosion rate and the on-site soil modifying factor of pipeline, determines when without external anti-corrosion layer and cathode protection measure, the first foundation corrosion rate that pipeline is corroded;
4th determining unit, for according to basic corrosion rate and the on-site stray current modifying factor of pipeline, determines when without stray current interference prevention safeguard measure, the second basic corrosion rate that pipeline is corroded;
5th determining unit, during for determining according to the first validity and first foundation corrosion rate only to consider soil corrosion factor, the first corrosion rate that pipeline is corroded;
6th determining unit, for according to the second validity and the second basic corrosion rate, when determining only to consider stray current interference, the second corrosion rate that pipeline is corroded;
7th determining unit, for getting maximal value in the first corrosion rate and the second corrosion rate as current corrosion rate.
Optionally, the 5th determining unit, for determining the first corrosion rate by following formula:
R
soil corrosion=R
soil correction(1-W
1) ... [7] wherein, R
soil corrosionrepresent the first corrosion rate;
R
soil correctionrepresent first foundation corrosion rate;
W
1represent the first validity.
Optionally, the 6th determining unit, for determining the second corrosion rate by following formula:
R
stray current=R
stray current correction(1-W
2) ... [8]
Wherein, R
stray currentrepresent the second corrosion rate;
R
stray current correctionrepresent the second basic corrosion rate;
W
2represent the second validity.
Optionally, the 4th determination module 103, specifically comprises:
8th determining unit, for determining the minimum permission wall thickness of working as anterior wall thickness and pipeline of pipeline;
9th determining unit, for determining current available wall thickness according to when anterior wall thickness and minimum permission wall thickness.
Optionally, the 9th determining unit, for determining current available wall thickness according to following formula:
B=B
original-R
current× T
go into operation[10]
Wherein, B represents and works as anterior wall thickness;
B
originalrepresent the original wall thickness of pipeline;
R
currentrepresent current corrosion rate;
T
go into operationrepresent the time of coming into operation of pipeline.
Optionally, the 8th determining unit, for determining minimum permission wall thickness according to following formula:
Wherein, B
allowrepresent minimum permission wall thickness;
P represents pipe operations pressure;
D represents pipe diameter;
σ represents the minimum yield strength of steel;
χ represents design ratio.
Optionally, device also comprises:
Computing module, for after according to residue service time of current corrosion rate and current available wall thickness determination pipeline, the failure likelihood according to following formula determination pipeline:
Wherein, F expression failure likelihood;
TTF represent residue service time.
Optionally, device also comprises:
6th determination module, for after the failure likelihood determining pipeline, according to the outer corrosion risk grade of the failure consequence determination pipeline of failure likelihood and pipeline.
Optionally, device also comprises:
7th determination module, for after the failure likelihood determining pipeline, determines that the product value of the failure consequence of failure likelihood and pipeline is the value-at-risk of pipeline;
8th determination module, for take value-at-risk as ordinate, the pipeline mileage of the pipeline Risk profiles that is horizontal ordinate determination pipeline.
The one or more embodiment of the present invention, at least has following beneficial effect:
Provide a kind of pipeline Index, comprising: determine the basic corrosion rate that pipeline is corroded, basic corrosion rate is specially: in unprotected situation, the corrosion rate that pipeline is corroded; Determine the validity of the outer corrosion protection of pipeline; According to the validity of basic corrosion rate and outer corrosion protection, determine the current corrosion rate of pipeline; Determine the current available wall thickness of pipeline; According to the residue service time of current corrosion rate and current available wall thickness determination pipeline.That is, when determining residue service time of pipeline, consider interior detection (such as: the current available wall thickness of pipeline, the basic corrosion rate of pipeline) and detected data (such as: the validity of the outer corrosion protection of pipeline) outward, thus having reached the technique effect of the residue service time can determining pipeline more accurately.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. a pipeline Index, is characterized in that, comprising:
Determine the basic corrosion rate of pipeline soil side;
Determine the validity of the outer corrosion protection of described pipeline;
According to the validity of described basic corrosion rate and described outer corrosion protection, determine the current corrosion rate of described pipeline;
Determine the current available wall thickness of described pipeline;
The residue service time of described pipeline is determined according to described current corrosion rate and described current available wall thickness.
2. the method for claim 1, is characterized in that, the described validity determining the outer corrosion protection of described pipeline, specifically comprises:
Determine the first validity of the safeguard procedures for soil corrosion of described pipeline;
Determine the second validity of the safeguard procedures for stray current interference of described pipeline.
3. method as claimed in claim 2, it is characterized in that, described the first validity determining the safeguard procedures for soil corrosion of described pipeline, specifically comprises:
Determine the first effective value of the validity of the external anti-corrosion layer characterizing described pipeline;
Determine the second effective value of the validity of the cathodic protection characterizing described pipeline;
Effective value is had to determine described first validity according to described first effective value and described second.
4. method as claimed in claim 3, is characterized in that, determine described first validity according to following formula:
W
1=1-(1-AF
anticorrosive coat) (1-AF
cathodic protection);
Wherein, W
1represent described first validity;
AF
anticorrosive coatrepresent described first effective value;
AF
cathodic protectionrepresent described second effective value.
5. method as claimed in claim 2, is characterized in that, according to the validity of described basic corrosion rate and described outer corrosion protection, determines the current corrosion rate of described pipeline, specifically comprises:
According to described basic corrosion rate and the on-site soil modifying factor of described pipeline, determine when without external anti-corrosion layer and cathode protection measure, the first foundation corrosion rate that described pipeline is corroded;
According to described basic corrosion rate and the on-site stray current modifying factor of described pipeline, determine when without stray current interference prevention safeguard measure, the second basic corrosion rate that described pipeline is corroded;
When determining only to consider soil corrosion factor according to described first validity and described first foundation corrosion rate, the first corrosion rate that described pipeline is corroded;
According to described second validity and described second basic corrosion rate, when determining only to consider stray current interference, the second corrosion rate that described pipeline is corroded;
Get maximal value in described first corrosion rate and described second corrosion rate as described current corrosion rate.
6. method as claimed in claim 5, is characterized in that, determine described first corrosion rate by following formula:
R
soil corrosion=R
soil correction(1-W
1);
Wherein, R
soil corrosionrepresent described first corrosion rate;
R
soil correctionrepresent described first foundation corrosion rate;
W
1represent the first validity.
7. method as claimed in claim 5, is characterized in that, determine described second corrosion rate by following formula:
R
stray current=R
stray current correction(1-W
2);
Wherein, R
stray currentrepresent described second corrosion rate;
R
stray current correctionrepresent described second basic corrosion rate;
W
2represent described second validity.
8. the method for claim 1, is characterized in that, the described current available wall thickness determining described pipeline, specifically comprises:
Determine the minimum permission wall thickness of working as anterior wall thickness and described pipeline of described pipeline;
Described current available wall thickness is determined when anterior wall thickness and described minimum permission wall thickness according to described.
9. method as claimed in claim 8, is characterized in that, determine described current available wall thickness according to following formula:
B=B
original-R
current× T
go into operation;
Wherein, B represents described and works as anterior wall thickness;
B
originalrepresent the original wall thickness of described pipeline;
R
currentrepresent current corrosion rate;
T
go into operationrepresent the time of coming into operation of described pipeline.
10. method as claimed in claim 8, is characterized in that, determine described minimum permission wall thickness according to following formula:
Wherein, B
allowrepresent minimum permission wall thickness;
P represents pipe operations pressure;
D represents pipe diameter;
σ represents the minimum yield strength of steel;
χ represents design ratio.
11. the method for claim 1, it is characterized in that, after the described residue service time determining described pipeline according to described current corrosion rate and described current available wall thickness, described method also comprises, and determines the failure likelihood of described pipeline according to following formula:
Wherein, F expression failure likelihood;
TTF represents described residue service time.
12. methods as claimed in claim 11, is characterized in that, described determine the failure likelihood of described pipeline after, described method also comprises:
The outer corrosion risk grade of described pipeline is determined according to the failure consequence of described failure likelihood and described pipeline.
13. methods as claimed in claim 11, is characterized in that, described determine the failure likelihood of described pipeline after, described method also comprises:
Determine that the product value of the failure consequence of described failure likelihood and described pipeline is the value-at-risk of described pipeline;
With described value-at-risk be ordinate, the pipeline mileage of described pipeline determines the Risk profiles of described pipeline for horizontal ordinate.
14. 1 kinds of pipeline index determining devices, is characterized in that, comprising:
First determination module, for determining the basic corrosion rate of pipeline soil side;
Second determination module, for determining the validity of the outer corrosion protection of described pipeline;
3rd determination module, for the validity according to described basic corrosion rate and described outer corrosion protection, determines the current corrosion rate of described pipeline;
4th determination module, for determining the current available wall thickness of described pipeline;
5th determination module, for determining the residue service time of described pipeline according to described current corrosion rate and described current available wall thickness.
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