Method for determination of pipeline technical condition

FIELD: transport.

SUBSTANCE: method for determination of pipeline technical condition consists in technical condition integral characteristic quantitative evaluation from which pipeline state is evaluated and corresponding corrective measures are planned. To determine mentioned integral characteristic in-line inspection (ILI) and integrated corrosive survey of pipeline is performed. From results of ILI, proportion factor between technical condition characteristic and relative quantity of defective pipes is established depending on pipeline diameter. Pipeline integrated corrosive survey is performed by measuring electric current from external source along pipeline route with interval not exceeding 10 m. According to obtained data, proportion factor between relative quantity of defective pipes and relative length of damaged protective coating. From determined parameters, technical condition integral characteristic is determined which describes pipeline damage.

EFFECT: higher quality of pipeline reconstruction, repair and technical diagnosis planning.

1 tbl, 2 dwg

 

The invention relates to the field of pipeline transportation and is intended for analysis of the technical condition of the pipeline (oil and gas) according to the results of corrosion inspection of the entire length of the track, classified in accordance with GOST R 27.002-2009 as a state of functioning, functional status, an inoperable state and limit state, and can be used for a quantitative estimation of its technical condition, depending on which the decision on compensatory measures into a single score with pipelines, technical analysis which is performed on the results of the in-line technical diagnostics.

The prior art method of analysis of the technical condition of the pipeline, based on the strength of pipeline segments identified in the technical diagnostics of defects (bumps, dents, cracks, stress corrosion, corrosion and other defects), as well as the calculation of the stress-strain state on the pipe sections with off-spec loads (see VV saliukov BECAUSE Bugaev, V.I. Gorodnichenko. Expert system analysis of the technical state of gas pipelines with defects // Reliability and resource pipeline structures. M: OOO VNIIGAZ, 2003. S-119). The disadvantage know what these method is, which evaluated the technical condition of the individual tubes, the results of which are given recommendations for corrective actions, and the technical condition of the pipeline as a whole is not defined. No integral indicator, describing the technical condition of the pipeline in General, it is not possible to predict the technical condition of the pipeline and optimize the planning of a comprehensive overhaul or reconstruction pipeline.

The closest to the technical nature of the claimed invention is a method of determining the technical condition of the pipeline to measure the technical condition of the pipeline, characterizing the damage of the pipeline detected by in-line diagnostics of pipeline defects (see Methodology for estimating the technical condition of the linear plot of MG on the results of inspection. CENTURIES saliukov, M. Mitrokhin, V. Molokanov, V.I. Gorodnichenko // Gas industry. - 2009. No. 4. P.47 - 50). Index technical condition of the pipeline is determined by the performance of the technical condition of pipes, fittings and welded joints. Depending on the performance of the technical state of pipelines and the speed of their change-set the priority output them in repair, type of repair work and peri is lichnosti re-inspections of the technical condition. The disadvantage of this method is that it cannot be extended to pipelines not equipped with cameras running, and receiving in-line inspection equipment, since these pipelines technical diagnosis throughout the length of lines in order to detect defects in the pipe wall and welded joints is not carried out, but only selective non-destructive testing of pipelines in the pits. Consequently, the use of this method of technical analysis to pipelines not equipped with cameras launching and receiving in-line inspection equipment, for a limited amount of data will give conservative estimates of their performance technical condition that will lead to incorrect planning the order of the output pipeline repair, the appointment of a form of repair works and the periodicity of re-inspections of the technical condition.

The purpose of the claimed invention is to remedy these disadvantages. The technical result is to increase the quality of planning, reconstruction, repair and technical diagnostics of pipelines on the basis of a single methodological approach of technical analysis for pipes, which is in-line diagnostics and TRU is provodov, unequipped cameras launching and receiving in-line equipment. The problem is solved and the technical result is achieved by the fact that according to the method of determining the technical condition of the pipeline that are classified as state of functioning, functional status, an inoperable state and limit state, which consists in the quantitative evaluation of the integral indicator of the technical condition characterizing the damage of the pipeline with regard to severity of defects, which will assess the condition of the pipeline and plan appropriate corrective measures, to determine the specified integral indicator perform line diagnostics, which determine the relative number of defective pipes in pipelines (the ratio of the number of defective pipes to pipes of a pipeline), and the corresponding indices of their technical condition, and using the method of least squares for determining the parameter of a linear mathematical model (see J. Forsythe, M. Malcolm, K., Moller. Machine methods of mathematical calculations. M.: MIR, 1980), construct the graph of a linear relationship between the rate of technical condition and the relative number of defective pipes, which set in for the threaded depending on the pipeline diameter and the coefficient of proportionality k Fri(parameter linear mathematical model) between the rate of technical condition and the relative number of defective pipes, produce a comprehensive corrosion inspection of the pipeline by measuring along the pipeline route in increments not exceeding Hume, electric current excited in the pipe by an external source, on the basis of which establish the relative length of damaged protective coating (the length of damaged protective coating to the length of the pipeline) LPDXand build the graph of a linear relationship between the relative number of defective pipes and the relative length of damaged protective coating LPDXon which set using the method of least squares (see j. Forsythe, M. Malcolm, K., Moller. Machine methods of mathematical calculations. M.: MIR, 1980) to determine the coefficient of proportionality kFri(parameter linear mathematical model) between the relative number of defective pipes and the relative length of damaged protective coating, after which, according to the coefficients of proportionality between the rate of technical condition and the relative number of defective pipes and the relative number of defective pipes and relative PR is tsennosti damaged protective coating, define the integral indicator of the technical condition Rcocharacterizing the damaged pipeline, as Pco=kFri·kPZ·LPDX.

Figure 1 shows the linear dependence of the rate of technical condition of Pcothe relative amount of the defective pipe, which is built according to the in-line technical diagnostirovannaya piping with outer diameter of 377 mm;

figure 2 - linear dependence of the relative number of defective pipes from the relative length of damaged protective coating LPDX.

As prerequisites for the establishment of the claimed method of evaluating the technical condition of the pipeline can be considered the results of the research, according to which between the relative damage of the protective coating (the length of the protective coating with integral resistance value of less than 500 Ohm·m2to the length of the pipeline) and the number of defects on the pipeline there is a linear dependence (see YU. Maltsev, ALEXANDER Rudoy, DSC. However, the Convergence results of resistivity logging and pipeline inspection gas main // the seventeenth international business meeting "Diagnostics-2007". M: "IDC Gazprom", 2008. 1. - P.61-165).

Thus, the basis for technical analysis of SOS the sustainability of pipelines, which is not performed in-line diagnostics, allowing to give a quantitative assessment of technical condition of the integral indicator of the technical condition), correlating with the results of the analysis of the technical state of pipelines, examined in-line detectors, was invited to consider the results of the corrosion survey the damage of the protective coating of the pipeline, performed over the entire length of its route.

In the first step of the study the dependencies between the technical condition of the metal pipe of a given diameter and condition of protective coatings perform the analysis of the results of calculation of indicators of the technical state of pipelines Pilidetermined by the results of in-line technical diagnostics (IPD) and the relative number of defective pipes Nth. The results of studies using the method of least squares showed that the rate of technical condition, the calculated results in-line technical diagnostics PIliand the relative number of defective pipes Nth(data line technical diagnosis), there are analytical dependence, linear equation which is written in the following form

Pili=kFri·Nsub> TD

where kFrithe proportionality coefficient for the linear relationship between the rate of technical condition, the calculated results in-line technical diagnostics of pipelines and the relative number of defective pipes, depending on the diameter of the pipeline, and its value is determined by using the method of least squares.

In the next step, establish a relationship between the relative length of damaged protective coating LPDXand the relative number of defective pipes Nth. To do this, use the results of corrosion tests and results in-line technical diagnostics of pipelines. Corrosion inspection of pipelines is carried out by measurement of the pipeline route in increments not exceeding 10 m, the electric current is excited in the pipe by means of a generator or other external source. In the result, it was found that a graph of the relationship between the relative length of damaged protective coating and the relative number of defective pipes is linear and, therefore, the relative number of defective pipes Nthcan be determined from the following equation

Nth=kPZ·LPDX

where kPZthe ratio proporcionalnom is for a linear relationship between the relative number of defective pipes in pipelines and the relative length of damaged protective coating, the value of which is determined by the method of least squares.

The established relationship between the relative number of defective pipes and the relative damage of the protective coating allows to determine the final form of the formula for calculating the indicator of the technical condition of pipelines. Taking into account the analytical dependence between the rate of technical condition, the calculated results in-line technical diagnostics PIliand the relative number of defective pipes NTDand analytical dependence between the relative length of damaged protective coating LPDXand the relative number of defective pipes Nthfor the pipeline, the rate of technical condition according to the results of corrosion surveys Pcothat correlate with the index of the technical condition of Pilidetermined by the results of in-line technical diagnostics, can be calculated by the formula

Pco=kFri·kPZ·LPDX.

Example.

An example implementation of a method for determining the integral indicator of the technical condition of the pipeline according to the results of corrosion surveys Pcosee for pipe with outside diameter Dnequal to 377 mm, wall thickness δ is the 9 mm, and a length L equal to 0.5 km in the Beginning was conducted corrosion survey of the pipeline to determine the relative extent of damaged protective coating LPDXaccording to the results of measurement of the pipeline route in increments of not more than 10 m device PCM values of the current in the pipeline at the measurement points. Indicator of the quality of the protective coating of the pipeline considered the degree of attenuation of the signal power (attenuation) in the area between the two measurement points. The attenuation of the Academy of Sciences was calculated by the formula:

Andn=2000lg(InIn+1)h

where In- current measurement point n, A;

In+i- current measurement point n+1, A;

h - step between measurement points, m

Exceeding An attenuation values 3 a/m indicates damage of the protective coating of the pipeline.

The quality of the protective coating of the pipeline can also be estimated by the value of the integral resistance. If the integral resistance in the area between the two measurement points is less than 500 Ω·m2then a protective coating is damaged.

The results of determination for the pipeline is rationally L, 0.5 miles, measured along the pipeline current, sections of the pipeline with a damaged protective coating shown in table 1.

The relative length of damaged protective coating according to the data presented in table 1, isLaboutpd=LpdL=0,0150,5=0,03.

Further, the coefficient of proportionality kFribetween the indicator of the technical condition of the pipeline is determined by the results of ili Piliand by the relative number of defective pipes Nthand the coefficient of proportionality kPZbetween the relative number of defective pipes, pipe Nthand the relative length of damaged protective coating LPDXis determined by the coefficient of proportionality between the rate of technical condition of the pipeline and the relative length of damaged protective coating.

To determine the coefficient of proportionality kFrigraph reflecting the linear relationship between the indicator of the technical condition of the pipeline is determined by the results of ili Piliand attributes is determined as being the number of defective pipes N th. With this aim, for all pipelines under consideration diameter, which was carried out in-line diagnostics, calculate the indicators of the technical condition of Piliin accordance with the methodology (see Methodology for estimating the technical condition of the linear plot of MG on the results of inspection. CENTURIES saliukov, M. Mitrokhin, V. Molokanov, V.I. Gorodnichenko // Gas industry. - 2009. No. 4. P.47 - 50) and is determined by the relative number of defective tubes. According to this data, using the method of least squares, graph linear dependence of the rate of technical condition of the pipeline Pilithe relative amount of defective pipes Nth(see figure 1), the tangent of the angle which the axis of abscissa defines the value of the proportionality coefficient kFri.

To determine the coefficient of proportionality kPZgraph reflecting a linear relationship between the relative number of defective pipes and the relative length of damaged protective coating. To do this for all pipelines, where there was an inspection and corrosion survey, determined the relative number of defective pipes Nthand the relative length of damaged protective coating LPDX. According to this data, with the use of the group of least squares, graph linear dependence of the relative number of defective pipes Nthfrom the relative length of damaged protective coating LPDX(see figure 2), the tangent of the angle which the axis of abscissa defines the value of kPZ.

After determining the coefficients of proportionality kFriand kPZcalculates the integral indicator of technical condition of Pco.

Pco=kFri·kPZ·LPDX=0,24·2,03·0,03=0,0147.

The proposed method allows a quantitative assessment of the technical condition of the existing pipeline, depending on which the decision on compensatory measures on a common scale with pipelines, technical analysis which is performed on the results of the in-line technical diagnostics.

Table 1
No.The beginning of the segment, mThe end of the segment, mThe length of the section, m
13107
22834 6
31791801
45345351
The length of damaged protective coating LDD15

The method of determining the technical condition of the pipeline that are classified as state of functioning, functional status, an inoperable state and limit state, which consists in the quantitative evaluation of the integral indicator of the technical condition characterizing the damage of the pipeline with regard to severity of defects, which will assess the condition of the pipeline and plan appropriate corrective actions, characterized in that for determining the specified integral indicator perform line diagnostics, which determine the relative number of defective pipes in pipelines and related indicators of their technical condition, and build, using the method of least squares, linear dependence between the rate of technical condition and the relative number of defective TRU is, which is determined depending on the pipeline diameter and the coefficient of proportionality kFribetween the indicator of the technical condition and the relative number of defective pipes, produce a comprehensive corrosion inspection of the pipeline by measuring along the pipeline route in increments not exceeding 10 m, the electric current is excited in the pipe by an external source, on the basis of which establish the relative length of damaged protective coating LPDXand build, using the method of least squares, linear dependence between the relative number of defective pipes and the relative length of damaged protective coating LPDX, which determine the coefficient of proportionality kPZbetween the relative number of defective pipes and the relative length of damaged protective coating, after which the established parameters define the integral indicator of technical condition of Pcocharacterizing the damaged pipeline, as
Pco=kFri·kPZ·LPDX.



 

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