CN104807966B - A kind of piping lane pipeline residual intensity and residual Life Calculation method - Google Patents
A kind of piping lane pipeline residual intensity and residual Life Calculation method Download PDFInfo
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Abstract
The invention discloses a kind of piping lane pipeline residual intensity and residual Life Calculation method, including: collect piping lane defect of pipeline data message；Judgement is planar defect or volume flaw；For planar defect, from piping lane defect of pipeline data message, obtain the engineering stress strain curve of defect tracking material, determine Failure Assessment figure, then calculate evaluation point, obtain the residual intensity of piping lane pipeline；For volume flaw, from piping lane defect of pipeline data message, obtain design ratio, weld joint efficiency and minimum wall-thickness measurement, by being calculated the residual intensity of piping lane pipeline；Calculate basic numerical value according to piping lane defect of pipeline data message, according to Extreme maximum distribution probability density function, Reliability Function, maximum corrosion depth point estimation Sum Maximum Likelihood Estimate, be calculated the residual life of piping lane pipeline.Thus calculate and predict residual intensity and the residual life of piping lane zone duct effectively and accurately.
Description
Technical field
The present invention relates to piping lane pipeline field, particularly relate to the residual intensity of piping lane pipeline, Life Calculating Methods.
Background technology
Piping lane defect of pipeline type is divided into planar defect and volume flaw by geometry.To in-service piping lane
Pipeline carries out the prediction in residual intensity and life-span and calculates, and obtains piping lane pipeline relevant information in advance, can effectively drop
Low accident rate, ensures pipe safety Effec-tive Function.
At present, defect tracking residual intensity calculates domestic and international method therefor and the standard followed is different.
External substantial residual strength criterion: ASME B31G " Remaining Strength of Corroded Pipeline handbook " (U.S.'s machine
Tool IEEE), elastic-plastic fracture mechanics based on Medium and low intensity material, have studied planar defect
Extension mechanism, failure mode and defect estimation method, and propose the Residual Strength Assessment calculating corrosion pipeline
Formula.API RP579-2000 " in-service suitability criterion " (American Petroleum Institute), uses FAD to lose efficacy
Assessment figure is evaluated.DNV RP-F101 (should gas company and Norske Veritas), mainly has two
Being grouped into, Part A ness safe coefficient method and Part B allowable stress method, ness safe coefficient method uses
Probability update equation ness safe coefficient determines the operation pressure allowable of corrosion pipeline；Allowable stress method is
The intensity of pipeline it is multiplied by again after failure pressure according to allowable stress design (ASD) criterion calculation corrosion default
Design ratio.
Domestic substantial residual strength criterion: " residue containing defect pipe-line is strong for SY/T 6477-2000
Degree evaluation methodology part 1: volume flaw ", it is adaptable to pipeline material is ductility, is in operation
Embrittlement will not occur, and pipeline does not comprise crack-type defect；SY/T 0087.1-2006 " steel pipe and storage
Outside tank corrosion evaluation standard buried steel pipeline, corrosion is directly evaluated ", it is only applicable to volume type corrosion default,
It is not suitable for crack-type defect.It is divided into residue minimum wall thickness (MINI W.) evaluation, dangerouse cross-section evaluation and residual strength evaluation
Three parts.
The method of pipeline residual life evaluation mainly includes corrosive pipeline comentropy life estimating method, artificial neuron
Net, pipeline probability statistics Forecasting Methodology etc..
Based on above-mentioned basic technology, design and new effective in-service piping lane pipeline is carried out residual intensity and life-span
Prediction computational methods, be the directions made great efforts of those skilled in the art.
Summary of the invention
It is an object of the invention to a kind of piping lane pipeline residual intensity and residual Life Calculation method, count effectively and accurately
Calculate and predict residual intensity and the residual life of piping lane zone duct.
The technical scheme realizing above-mentioned purpose is:
A kind of piping lane pipeline residual intensity and residual Life Calculation method, including:
Collect piping lane defect of pipeline data message；
Judgement is planar defect or volume flaw；
For planar defect, obtain from piping lane defect of pipeline data message the engineering stress of defect tracking material-
Strain curve, determines Failure Assessment figure, then calculates evaluation point, obtain the residual intensity of piping lane pipeline；
For volume flaw, from piping lane defect of pipeline data message, obtain design ratio, weld joint efficiency and minimum
Wall-thickness measurement, by being calculated the residual intensity of piping lane pipeline；
According to piping lane defect of pipeline data message calculate basic numerical value, according to Extreme maximum distribution probability density function, can
By degree function, maximum corrosion depth point estimation Sum Maximum Likelihood Estimate, it is calculated the residual life of piping lane pipeline.
In above-mentioned piping lane pipeline residual intensity with residual Life Calculation method, described piping lane defect of pipeline data
Information, including: basis duct size information, pipeline configuration and performance parameter, weld and temperature impact, tubing stress are answered
Change relation and the crack form of defect.
In above-mentioned piping lane pipeline residual intensity with residual Life Calculation method, described planar defect residue is strong
Degree calculates, including:
According to piping lane defect of pipeline data message, it may be judged whether can directly obtain the engineering stress of defect tracking material-
Strain curve；
If so, Failure Assessment figure is determined；
If it is not, use the load-deformation curve of same specification material, strength degree, elastic modelling quantity is utilized to try to achieve defect
Engineering stress-the strain curve of pipeline material；
Calculate evaluation point, obtain the residual intensity of piping lane pipeline.
In above-mentioned piping lane pipeline residual intensity with residual Life Calculation method, described volume flaw residue is strong
Degree calculates, including:
From piping lane defect of pipeline data message, obtain design ratio, weld joint efficiency and minimum wall-thickness measurement, calculate
To axial force and moment of flexure；
Axial force and calculation of Bending Moment is utilized to obtain hoop minimum wall thickness (MINI W.), its maximum allowable working pressure and bear
The pipe wall thickness that load increases；
Utilize hoop minimum wall thickness (MINI W.), its maximum allowable working pressure and bear load increase pipe wall thickness calculate
To radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof；
Utilize radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof to be calculated minimum and require that wall thickness and maximum thereof permit
Permitted operating pressure；
Wall thickness and maximum allowable working pressure are calculated residual wall thickness ratio and housing parameter to utilize minimum to require；
Utilize residual wall thickness than judging axially with housing parameter and hoop flaw size acceptability, obtain piping lane pipeline
Residual intensity.
In above-mentioned piping lane pipeline residual intensity with residual Life Calculation method, the residue longevity of described piping lane pipeline
Life calculates, including:
It is calculated basic numerical value according to piping lane defect of pipeline data message；
According to basic numerical value, utilize Extreme maximum distribution probability density function and Reliability Function, calculate and obtain size ginseng
Number and location parameter；
According to dimensional parameters and location parameter, set up reliability and corrode Q-percentile life relation curve with pressure pipeline, and
Analyze the point estimation obtaining maximum corrosion depth；
Under 90% confidence level, maximum corrosion depth is carried out again Maximum-likelihood estimation；
Corrode Q-percentile life relation according to reliability with pressure pipeline, draw the residual life time limit.
In above-mentioned piping lane pipeline residual intensity with residual Life Calculation method, described basic numerical value includes:
Big corrosion depth, average, standard deviation, corrosion allowance, corrosion rate and the coefficient of variation.
The invention has the beneficial effects as follows: the present invention will tie with fitness-for-service assessment method by Safety Assessment Methods qualitatively mutually
Close, on the one hand achieve whether qualitative judgement piping lane pipeline is in safety zone, on the other hand then achieve quantitative
Engineering evaluation, the most easy and simple to handle, it is not necessary to overspending manpower and materials, and data support can be provided, obtain piping lane
The relational structural information of pipeline, carries out the prediction in residual intensity and life-span and calculates, obtain in advance in-service piping lane pipeline
Piping lane pipeline relevant information, reduces accident rate, ensures pipe safety Effec-tive Function.
Accompanying drawing explanation
Fig. 1 is the piping lane pipeline residual intensity flow chart with residual Life Calculation method of the present invention；
Fig. 2 is the flow chart that planar-type defect residual intensity of the present invention calculates；
Fig. 3 is the flow chart that in the present invention, volume flaw residual intensity calculates；
Fig. 4 is the flow chart of piping lane pipeline residual Life Calculation in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to Fig. 1, the piping lane pipeline residual intensity of the present invention and residual Life Calculation method, comprise the following steps:
Step S1, collects piping lane defect of pipeline data message, including: basis duct size information, pipeline configuration and property
The multi-aspect informations such as the crack form of energy parameter, welding and temperature impact, tubing stress-strain relation and defect.
Step S2, it is judged that be planar defect or volume flaw, if planar defect, performs step S3；
If volume flaw, perform step S4；
Step S3, for planar defect, obtains defect tracking material from piping lane defect of pipeline data message
Engineering stress-strain curve, determines Failure Assessment figure, then calculates evaluation point, obtain the residual intensity of piping lane pipeline.
Specifically, refer to Fig. 2, including:
Step S31, according to piping lane defect of pipeline data message, it may be judged whether can directly obtain defect tracking material
Engineering stress-strain curve；If so, step S33 is performed；If it is not, perform step S32.
Step S32, uses the load-deformation curve of same specification material, utilizes strength degree, elastic modelling quantity to try to achieve
Engineering stress-the strain curve of defect tracking material.
Step S33, determines Failure Assessment figure.
Step S34, calculates evaluation point, obtains the residual intensity of piping lane pipeline.
Step S4, for volume flaw, obtains design ratio, weld seam from piping lane defect of pipeline data message
Coefficient and minimum wall-thickness measurement, by being calculated the residual intensity of piping lane pipeline.Specifically, refer to Fig. 3,
Including:
Step S41, obtains design ratio, weld joint efficiency and minimum measurement wall from piping lane defect of pipeline data message
Thickness, is calculated axial force and moment of flexure.
Step S42, utilizes axial force and calculation of Bending Moment to obtain hoop minimum wall thickness (MINI W.), its maximum allowable work pressure
Power and bear load increase pipe wall thickness.
Step S43, utilizes hoop minimum wall thickness (MINI W.), its maximum allowable working pressure and bears the pipe that load increases
Wall thickness is calculated radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof.
Step S44, utilize radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof be calculated minimum require wall thickness and
Its maximum allowable working pressure.
Step S45, wall thickness and maximum allowable working pressure thereof are calculated residual wall thickness ratio and shell to utilize minimum to require
Body parameter.
Step S46, utilizes residual wall thickness than judging axially with housing parameter and hoop flaw size acceptability,
Residual intensity to piping lane pipeline.
Step S5, calculates basic numerical value according to piping lane defect of pipeline data message, close according to Extreme maximum distribution probability
Degree function, Reliability Function, maximum corrosion depth point estimation Sum Maximum Likelihood Estimate, be calculated piping lane pipeline
Residual life.Specifically, refer to Fig. 4, including:
Step S51, is calculated basic numerical value according to piping lane defect of pipeline data message, including: maximum corrosion is deep
Degree, average, standard deviation, corrosion allowance, corrosion rate and the coefficient of variation.
Step S52, according to basic numerical value, utilizes Extreme maximum distribution probability density function and Reliability Function, calculates
Obtain dimensional parameters and location parameter.
Step S53, according to dimensional parameters and location parameter, sets up reliability and closes with pressure pipeline corrosion Q-percentile life
It is curve, and analyzes the point estimation obtaining maximum corrosion depth.
Step S54, under 90% confidence level, again carries out Maximum-likelihood estimation to maximum corrosion depth.
Step S55, corrodes Q-percentile life relation according to reliability with pressure pipeline, draws the residual life time limit.
Above example is used for illustrative purposes only, rather than limitation of the present invention, about the technology of technical field
Personnel, without departing from the spirit and scope of the present invention, it is also possible to make various conversion or modification, therefore
The technical scheme of all equivalents also should belong to scope of the invention, should be limited by each claim.
Claims (5)
1. a piping lane pipeline residual intensity and residual Life Calculation method, it is characterised in that including:
Collect piping lane defect of pipeline data message；
Judgement is planar defect or volume flaw；
For planar defect, the engineering directly obtaining defect tracking material from piping lane defect of pipeline data message should
Force-strain curve, if can not directly obtain, use same specification material load-deformation curve, utilize strength degree,
Elastic modelling quantity tries to achieve the engineering stress-strain curve of defect tracking material；Determine Failure Assessment figure, then calculate evaluation
Point, obtains the residual intensity of piping lane pipeline；
For volume flaw, from piping lane defect of pipeline data message, obtain design ratio, weld joint efficiency and minimum
Wall-thickness measurement, by being calculated the residual intensity of piping lane pipeline；
According to piping lane defect of pipeline data message calculate basic numerical value, according to Extreme maximum distribution probability density function, can
By degree function, maximum corrosion depth point estimation Sum Maximum Likelihood Estimate, it is calculated the residual life of piping lane pipeline.
Piping lane pipeline residual intensity the most according to claim 1 and residual Life Calculation method, its feature exists
In, described piping lane defect of pipeline data message, including: basis duct size information, pipeline configuration and performance parameter,
Welding and temperature impact, tubing stress-strain relation and the crack form of defect.
Piping lane pipeline residual intensity the most according to claim 1 and residual Life Calculation method, its feature exists
In, described volume flaw residual intensity calculates, including:
From piping lane defect of pipeline data message, obtain design ratio, weld joint efficiency and minimum wall-thickness measurement, calculate
To axial force and moment of flexure；
Axial force and calculation of Bending Moment is utilized to obtain hoop minimum wall thickness (MINI W.), its maximum allowable working pressure and bear
The pipe wall thickness that load increases；
Utilize hoop minimum wall thickness (MINI W.), its maximum allowable working pressure and bear load increase pipe wall thickness calculate
To radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof；
Utilize radially minimum wall thickness (MINI W.) and maximum allowable working pressure thereof to be calculated minimum and require that wall thickness and maximum thereof permit
Permitted operating pressure；
Wall thickness and maximum allowable working pressure thereof are calculated residual wall thickness ratio and housing parameter to utilize minimum to require；
Utilize residual wall thickness than judging axially with housing parameter and hoop flaw size acceptability, obtain piping lane pipeline
Residual intensity.
Piping lane pipeline residual intensity the most according to claim 1 and residual Life Calculation method, its feature exists
In, the residual Life Calculation of described piping lane pipeline, including:
It is calculated basic numerical value according to piping lane defect of pipeline data message；
According to basic numerical value, utilize Extreme maximum distribution probability density function and Reliability Function, calculate and obtain size ginseng
Number and location parameter；
According to dimensional parameters and location parameter, set up reliability and corrode Q-percentile life relation curve with pressure pipeline, and
Analyze the point estimation obtaining maximum corrosion depth；
Under 90% confidence level, maximum corrosion depth is carried out again Maximum-likelihood estimation；
Corrode Q-percentile life relation according to reliability with pressure pipeline, draw the residual life time limit.
5., according to the piping lane pipeline residual intensity described in claim 1 or 4 and residual Life Calculation method, it is special
Levying and be, described basic numerical value includes: maximum corrosion depth, average, standard deviation, corrosion allowance, corrosion speed
Rate and the coefficient of variation.
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