CN103969124A - Method and apparatus for acquiring pressure of pressure test oil and gas transmission pipeline in first-level region - Google Patents

Abstract

The invention discloses a method and apparatus for acquiring the pressure of a pressure test oil and gas transmission pipeline in a first-level region, belonging to the field of pipeline pressure test. The method comprises the following steps: if the strength testing pressure value of a pipeline low point is less than a maximum strength testing pressure value which is allowed to bear by the pipeline low point, determining a maximum strength testing pressure value which is allowed to bear by a pipeline high point and reached by the testing pressure of the pipeline high point as final pressure-test strength; and if the strength testing pressure value of the pipeline low point is greater than the maximum strength testing pressure value which is allowed to bear by the pipeline low point, determining the maximum strength testing pressure value which is allowed to bear by the pipeline low point and reached by the testing pressure of the pipeline low point as final pressure-test strength. According to the invention, each pressure-test strength value in the pipeline is obtained through calculation, final pressure-test strength of the pipeline is determined, testing pressure is increased as much as possible on the premise that safety is guaranteed, safety performance of the pipeline is effectively improved, and a certain demonstration effect is exerted on improvement of transmission capability of the pipeline.

Description

A kind of method and device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure

Technical field

The present invention relates to pipeline pressure test field, particularly a kind of method and device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure.

Background technology

Pipeline pressure test is the important step in pipe-line construction, for verifying whether the bulk strength of pipeline can bear the pressure of conduit running.In the mother metal of pipeline and weld seam, unavoidably there is defect, improve pressure test pressure and can make to improve defect exposure, and, under high strength pressure test pressure, the relative pressure test pressure of pressure of pipeline operation operation is lower, therefore move saferly, and there are certain potentiality and improve operating pressure, thereby improve freight volume.

In prior art, according in existing regulation and stipulation, pressure test pressure depends primarily on the design pressure of pipeline.In the gas pipe line of one-level area, pressure test pressure must not be lower than 1.1 of design pressure times; In the obvious pressure testing section of the discrepancy in elevation, the circumference stress bearing need to adjust the pressure testing of pipeline low spot time, the pipeline circumference stress that its pressure test pressure is corresponding generally should not be greater than 0.9 times of the minimum yield strength of tubing; Allow through design special, the pipeline circumference stress maximum that its pressure test pressure is corresponding must not be greater than 0.95 times of the minimum yield strength of tubing.In pipeline pressure test process, mainly control pressure testing process by monitoring pressure value.

Realizing in process of the present invention, inventor finds that prior art at least exists following problem:

In the situation that caliber, grade of steel are definite, design pressure is determined by pipeline strength design ratio.Intensity Design coefficient depends on tube-making technology level and pipeline construction level, there is obvious experience character, lack tight calculating demonstration, therefore in existing regulation and stipulation to one-level area gas pipe line only regulation pressure test pressure be to be not less than the design pressure of 1.1 times.But convenient for Practical Project pressure testing, the obvious or special location in the discrepancy in elevation, allows pipeline part to reach higher pressure test pressure, the hydraulic test pressure setting that this pressure test pressure higher limit is generally steel pipe while dispatching from the factory.But actual steel strength exists a probability distribution, only do not reach the pressure testing object of abundant inspection pipeline strength or may cause unacceptable damage to pipeline taking a low value or high value as pressure testing foundation.But by which kind of method calculate theoretically pressure test pressure value, adopt how high pressure test pressure, make pipeline under the prerequisite of safety, improve as far as possible pressure test pressure, never have the precedent of this respect in pipeline pressure test field.

Summary of the invention

In order to solve the problem of prior art, the embodiment of the present invention provides a kind of method and device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure.Described technical scheme is as follows:

On the one hand, provide a kind of method of obtaining one-level Region of Oil-gas delivery pipe pressure test pressure, described method comprises:

According to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculate the pipeline wall thickness low value under the first probability fiduciary level;

According to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculate the pipeline yield strength low value under the second probability fiduciary level;

According to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value;

According to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot maximum intensity pressure test pressure allowed to bear value;

If described pipeline low spot intensity pressure test pressure value is less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of high pipeline point is reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity;

If described pipeline low spot intensity pressure test pressure value is greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of pipeline low spot is reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

Wherein, the pipeline wall thickness low value under described calculating the first probability fiduciary level, comprising:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

Wherein, the pipeline yield strength low value under described calculating the second probability fiduciary level, comprising:

σ _low=μ _bend-2.33 σ _bend

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

Wherein, the high point of pipeline maximum intensity pressure test pressure value allowed to bear under described calculating the 3rd probability fiduciary level, comprising:

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube;

Accordingly, calculate pipeline low spot intensity pressure test pressure value, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline.

Wherein, described according to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculating pipeline low spot maximum intensity pressure test pressure allowed to bear value, comprising:

P _max=1.1P _{gao Dian}

Wherein, P _maxfor pipeline low spot maximum intensity pressure test pressure allowed to bear value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear.

On the other hand, provide a kind of device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure, described device comprises:

The first computing module, for according to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculates the pipeline wall thickness low value under the first probability fiduciary level;

The second computing module, for according to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculates the pipeline yield strength low value under the second probability fiduciary level;

The 3rd computing module, be used for according to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value;

The 4th computing module, for according to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculates pipeline low spot maximum intensity pressure test pressure allowed to bear value;

The first determination module, if be less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of high pipeline point reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity;

The second determination module, if be greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of pipeline low spot reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

Wherein, described the first computing module specifically for:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

Wherein, described the second computing module specifically for:

σ _low=μ _bend-2.33 σ _bend

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

Wherein, described the 3rd computing module specifically for:

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube;

Accordingly, calculate pipeline low spot intensity pressure test pressure value, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline.

Wherein, described the 4th computing module specifically for:

P _max=1.1P _{gao Dian}

Wherein, P _maxfor pipeline low spot maximum intensity pressure test pressure allowed to bear value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear.

The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:

By the high relation of putting between maximum intensity pressure test pressure value allowed to bear, pipeline low spot intensity pressure test pressure value, these three parameters of pipeline low spot maximum intensity pressure test pressure allowed to bear value of pipeline calculating, determine the pressure testing intensity that pipeline is final, improve as much as possible under the premise that security is guaranteed pressure test pressure, for effectively raising the security performance of pipeline, and the transport capacity that improves pipeline is played to certain demonstration effect.

Brief description of the drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 be the embodiment of the present invention one provide obtain one-level Region of Oil-gas delivery pipe pressure test pressure method flow diagram;

Fig. 2 be the embodiment of the present invention two provide obtain one-level Region of Oil-gas delivery pipe pressure test pressure apparatus structure schematic diagram.

Embodiment

For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.

Embodiment mono-

The embodiment of the present invention provides a kind of method of obtaining one-level Region of Oil-gas delivery pipe pressure test pressure, and referring to Fig. 1, method flow comprises:

101: according to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculate the pipeline wall thickness low value under the first probability fiduciary level.

If pipeline meets the pipeline wall thickness sample data of normal distribution and integrates as X _{wall thickness}, wherein the average of sample is μ _{wall thickness}, standard deviation is σ _{wall thickness}, i.e. X _{wall thickness}～N(μ _{wall thickness}, σ _{wall thickness}).According to the first probability fiduciary level, preferably, with 99.9% fiduciary level, determine pipeline wall thickness low value δ _low.Computing formula is as follows:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}(1)

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

102: according to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculate the pipeline yield strength low value under the second probability fiduciary level.

If pipeline meets the pipeline yield strength sample data of normal distribution and integrates as X _bend, wherein the average of sample is μ _bend, standard deviation is σ _bend, i.e. X _bend～N(μ _bend, σ _bend).According to the second probability fiduciary level, preferably, with 99% fiduciary level, determine pipeline yield strength low value σ _low.Computing formula is as follows:

σ _low=μ _bend-2.33 σ _bend(2)

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

103: according to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value.

Pipeline is at the high point of pipeline maximum intensity pressure test pressure value allowed to bear, i.e. P _{gao Dian}under effect, the probability that the circumference stress of generation exceedes pipeline yield strength must not exceed permissible value, and this permissible value is made as 10 ^-2(according to DNV OS F101, the targeted failure probability of the interim acceptable non-artificial destruction of stage of pipeline is 10 ^-2).The computing formula that interior pressure produces pipeline circumference stress is

$\mathrm{\σ}=\frac{\mathrm{PD}}{2\mathrm{\δ}}---\left(3\right)$

(3), in formula, P is the interior pressure that pipeline bears, unit: MPa; D is outer diameter tube, unit: mm; δ is pipeline wall thickness, unit: mm; σ is the circumference stress that interior pressure produces, unit: MPa.Because 99% steel pipe yield strength value in pipeline is greater than (2) formula and calculates the σ of gained _low, be therefore no more than σ as long as (3) formula of guarantee is calculated the circumference stress σ of gained _low, can ensure the permission failure probability of pressure testing.?

$\mathrm{\σ}=\frac{\mathrm{PD}}{2\mathrm{\δ}}\≤{\mathrm{\σ}}_{\mathrm{low}}---\left(4\right)$

So permission maximum pressure value P when known pressure testing _{gao Dian}for

Because (4) formula all needs to set up to ducted any steel pipe, under the definite condition of outer diameter tube D, tackle in theory minimum wall thickness (MINI W.) and all set up.Consider that the minimum wall thickness (MINI W.) being obtained by sample is for ducted all steel pipes, not necessarily minimum value, therefore according to formula (1), determines that the wall thickness δ in formula (5) is δ _low, (4) formula is all set up 99.9% steel pipe.Can obtain thus P _{gao Dian}expression formula be

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube.

Now the 3rd probability fiduciary level p of (4) formula is

p=99.9%×99%=98.9%≈99% （7）

As can be seen here, work as P _{gao Dian}while expression by formula (6), the fiduciary level of pressure testing is still 99%, meets the failure probability value (in fact,, when considering that the actual yield strength of pipeline is greater than after tubing small sample yield strength, fiduciary level value is greater than 99%) allowing.By formula (1), formula (2) substitution formula (6), can obtain the hydraulic pressure pressure value P of the high point of pipeline _{gao Dian}for

Accordingly, according to the difference in height of pipeline and the high point of pipeline maximum intensity pressure test pressure value P allowed to bear _{gao Dian}, calculate pipeline low spot intensity pressure test pressure value P _{low spot}, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline, ρ _waterfor the density of water, g is acceleration of gravity.

104: according to the high point of described pipeline maximum intensity pressure test pressure allowed to bear, calculate pipeline low spot maximum intensity pressure test pressure allowed to bear value.

At the intensity pressure test pressure P that determines the high point of pipeline _{gao Dian}time, do not consider the difference of the actual yield strength of pipeline and tubing small sample yield strength.When actual pipeline pressure test, in two dimensional stress state, application fourth strength theory, the yield condition of known steel pipe is

$\sqrt{\frac{1}{2}[{({\mathrm{\σ}}_h-{\mathrm{\σ}}_L)}^2+{{\mathrm{\σ}}_L}^2+{{\mathrm{\σ}}_h}^2]}={({{\mathrm{\σ}}_h}^2-{\mathrm{\σ}}_h{\mathrm{\σ}}_L+{{\mathrm{\σ}}_L}^2)}^{0.5}={\mathrm{\σ}}_s---\left(10\right)$

In formula, σ _hfor the pipeline circumference stress that interior pressure produces, σ _lfor the axial stress that interior pressure produces, σ _sfor tubing yield strength.When the situ strength hydraulic testing, because pipeline buried pipeline is tied, there is σ _l=μ σ _h.Because the Poisson ratio μ of pipe line steel is 0.3, therefore formula (10) can abbreviation be

0.889σ _h=σ _s（11）

Thereby have

σ _h=1.125σ _s（12）

Therefore, equally, according to 99% fiduciary level, the equivalent stress reaching when pressure testing must not exceed tubing yield strength σ _lowtime, the circumference stress that actual steel pipe can bear is 1.125 σ _low, after decimal rounding, be 1.1 σ _low, corresponding pipeline low spot maximum intensity pressure test pressure allowed to bear value P thus _maxcomputing formula is

From formula (12) also, circumference stress when actual pipeline surrender is 1.125 times of tubing small sample yield strength, therefore the permission pressure test pressure that step (3) is calculated is still too conservative.Formula (13) shows, as long as pipeline low spot pressure test pressure P _maxbe no more than 1.1P _{gao Dian}, still can ensure pressure testing time, the probability of actual steel pipe generation surrender is not more than 10 ^-2.

Therefore step 104 can be specially:

According to pipeline yield strength low value, pipeline axial stress, the Poisson ratio of pipeline, determines the maximal value of pipeline circumference stress allowed to bear;

According to the maximal value of described pipeline circumference stress, described pipeline wall thickness low value and described outer diameter tube, calculate pipeline low spot maximum intensity pressure test pressure allowed to bear.

105: if described pipeline low spot intensity pressure test pressure value is less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of high pipeline point is reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity.

106: if described pipeline low spot intensity pressure test pressure value is greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of pipeline low spot is reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

Illustrate:

Certain newly-built gas transmission line external diameter is 1219mm, and grade of steel is X80, design pressure 12MPa.This pipeline one-level area pressure testing segment length 12km, the discrepancy in elevation is 42.1m, wall thickness 18.4mm now need to carry out high strength pressure testing to this pressure testing section.For this pressure testing section, intensity pressure test pressure computing method of the present invention are:

Step 1: according to pipeline wall thickness sample data collection, as shown in table 1, calculate pipeline wall thickness low value δ _low.The average μ of pipeline wall thickness sample data localized ducting wall thickness _{wall thickness}for 18.406mm, the standard deviation sigma of pipeline wall thickness sample data collection _{wall thickness}for 0.0155mm, under 99.9% probability fiduciary level, according to formula (1), can obtain δ _lowfor 18359mm.

18.42	18.38	18.41	18.42	18.43	184	18.39	18.38
								18.42	18.41	18.41	18.39	18.41	184	18.42

Table 1

Step 2: according to pipeline yield strength sample data collection, as shown in table 2, calculate pipeline yield strength σ _low.Pipeline yield strength sample data is concentrated the average μ of yield strength _bendfor 584.1MPa, the standard deviation sigma of pipeline yield strength sample data collection _bendfor 22.70MPa, under 99% probability fiduciary level, according to formula (2), can obtain σ _lowfor 531.2MPa.

575	561	583	570	648	653	579	608	562	555
										558	559	590	591	588	584	589	593	559	559
563	567	630	594	557	569	568	593	564	585
										565	557	592	569	589	605	579	598	560	569
582	566	582	560	579	624	574	617	570	600
										583	579	608	556	555	620	582	594	560	605

570	605	559	572	557	569	583	622	566	562
										571	625	561	571	592	605	579	581	557	555
555	605	600	585	604	576	618	583	589	555
										589	615	610	567	597	614	567	580	600	555
598	570	580	637	599	588	568	568	580	579
										570	569	600	634	632	594	563	615	560	574
660	599	555	598	609	608	605	575	559	557
										560	584	585	565	577	611	579	607	587	595
555	575	610	612	564	581	585	559	564	603

Table 2

Step 3: determine the high point of pipeline maximum intensity pressure test pressure value P allowed to bear _{gao Dian}.According to formula (8), can obtain P _{gao Dian}for upwards rounding of 16.0MPa(decimal).According to GB50369-2006 " construction of oil gas engineering in pipeline and acceptance specification " (existing), can obtain its pressure test pressure is 13.2MPa.After application the present invention that hence one can see that, pressure test pressure has improved 21.2%.

Step 4: determine pipeline low spot intensity pressure test pressure maximal value P _max.P _maxfor 1.1P _{gao Dian}, be 17.6MPa.

Step 5: actual pressure test pressure is determined.According to this section of pressure testing section discrepancy in elevation 42.1m and P _{gao Dian}, can reach after 16.0MPa by proper high point pressure low spot pressure P _{low spot}for 16.41MPa, be less than P _max, therefore this pressure testing section can reach 16.0MPa according to the high point of pipeline section and carries out pressure testing.

The embodiment of the present invention is by the high relation of putting between maximum intensity pressure test pressure value allowed to bear, pipeline low spot intensity pressure test pressure value, these three parameters of pipeline low spot maximum intensity pressure test pressure allowed to bear value of pipeline calculating, determine the pressure testing intensity that pipeline is final, improve as much as possible under the premise that security is guaranteed pressure test pressure, for effectively raising the security performance of pipeline, and the transport capacity that improves pipeline is played to certain demonstration effect.

Embodiment bis-

The embodiment of the present invention provides a kind of device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure, and referring to Fig. 2, device comprises:

The first computing module 201, for according to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculates the pipeline wall thickness low value under the first probability fiduciary level;

The second computing module 202, for according to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculates the pipeline yield strength low value under the second probability fiduciary level;

The 3rd computing module 203, be used for according to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value;

The 4th computing module 204, for according to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculates pipeline low spot maximum intensity pressure test pressure allowed to bear value;

The first determination module 205, if be less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of high pipeline point reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity;

The second determination module 206, if be greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of pipeline low spot reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

In embodiment, described the first computing module 201 specifically for:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

Wherein, described the second computing module 202 specifically for:

σ _low=μ _bend-2.33 σ _bend

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

Wherein, described the 3rd computing module 203 specifically for:

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube;

Accordingly, calculate pipeline low spot intensity pressure test pressure value, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline.

Wherein, described the 4th computing module 204 specifically for:

P _max=1.1P _{gao Dian}

Wherein, P _maxfor pipeline low spot maximum intensity pressure test pressure allowed to bear value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear.

The embodiment of the present invention is by the high relation of putting between maximum intensity pressure test pressure value allowed to bear, pipeline low spot intensity pressure test pressure value, these three parameters of pipeline low spot maximum intensity pressure test pressure allowed to bear value of pipeline calculating, determine the pressure testing intensity that pipeline is final, improve as much as possible under the premise that security is guaranteed pressure test pressure, for effectively raising the security performance of pipeline, and the transport capacity that improves pipeline is played to certain demonstration effect.

The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can carry out the hardware that instruction is relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a method of obtaining one-level Region of Oil-gas delivery pipe pressure test pressure, is characterized in that, described method comprises:

According to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculate the pipeline wall thickness low value under the first probability fiduciary level;

According to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculate the pipeline yield strength low value under the second probability fiduciary level;

According to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value;

According to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot maximum intensity pressure test pressure allowed to bear value;

If described pipeline low spot intensity pressure test pressure value is less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of high pipeline point is reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity;

If described pipeline low spot intensity pressure test pressure value is greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value, the pressure test pressure of pipeline low spot is reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

2. method according to claim 1, is characterized in that, the pipeline wall thickness low value under described calculating the first probability fiduciary level, comprising:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

3. method according to claim 1, is characterized in that, the pipeline yield strength low value under described calculating the second probability fiduciary level, comprising:

σ _low=μ _bend-2.33 σ _bend

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

4. method according to claim 1, is characterized in that, the high point of pipeline maximum intensity pressure test pressure value allowed to bear under described calculating the 3rd probability fiduciary level, comprising:

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube;

Accordingly, calculate pipeline low spot intensity pressure test pressure value, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline.

5. method according to claim 1, is characterized in that, described according to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculating pipeline low spot maximum intensity pressure test pressure allowed to bear value, comprising:

P _max=1.1P _{gao Dian}

Wherein, P _maxfor pipeline low spot maximum intensity pressure test pressure allowed to bear value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear.

6. a device that obtains one-level Region of Oil-gas delivery pipe pressure test pressure, is characterized in that, described device comprises:

The first computing module, for according to the definite pipeline wall thickness average of the concentrated sample of pipeline wall thickness sample data and pipeline wall thickness standard deviation, calculates the pipeline wall thickness low value under the first probability fiduciary level;

The second computing module, for according to the definite pipeline yield strength average of the concentrated sample of pipeline yield strength sample data and pipeline yield strength standard deviation, calculates the pipeline yield strength low value under the second probability fiduciary level;

The 3rd computing module, be used for according to described pipeline wall thickness low value and described pipeline yield strength low value and outer diameter tube, calculate the high point of pipeline maximum intensity pressure test pressure value allowed to bear under the 3rd probability fiduciary level, and according to the difference in height of pipeline and the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculate pipeline low spot intensity pressure test pressure value;

The 4th computing module, for according to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear, calculates pipeline low spot maximum intensity pressure test pressure allowed to bear value;

The first determination module, if be less than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of high pipeline point reached to the high point of described pipeline maximum intensity pressure test pressure value allowed to bear and be defined as final pressure testing intensity;

The second determination module, if be greater than described pipeline low spot maximum intensity pressure test pressure allowed to bear value for described pipeline low spot intensity pressure test pressure value, the pressure test pressure of pipeline low spot reached to described pipeline low spot maximum intensity pressure test pressure allowed to bear value and be defined as final pressure testing intensity.

7. device according to claim 6, is characterized in that, described the first computing module specifically for:

δ _low=μ _{wall thickness}-3.01 σ _{wall thickness}

Wherein, δ _lowfor described pipeline wall thickness low value; μ _{wall thickness}for described pipeline wall thickness average; σ _{wall thickness}for described pipeline wall thickness standard deviation.

8. device according to claim 6, is characterized in that, described the second computing module specifically for:

σ _low=μ _bend-2.33 σ _bend

Wherein, σ _lowfor described pipeline yield strength low value; μ _bendfor described pipeline yield strength average; σ _bendfor described pipeline yield strength standard deviation.

9. device according to claim 6, is characterized in that, described the 3rd computing module specifically for:

Wherein, P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; σ _lowfor pipeline yield strength low value; δ _lowfor pipeline wall thickness low value, D is outer diameter tube;

Accordingly, calculate pipeline low spot intensity pressure test pressure value, comprising:

Wherein, P _{low spot}for pipeline low spot intensity pressure test pressure value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear; H is the difference in height of pipeline.

10. device according to claim 6, is characterized in that, described the 4th computing module specifically for:

P _max=1.1P _{gao Dian}

Wherein, P _maxfor pipeline low spot maximum intensity pressure test pressure allowed to bear value; P _{gao Dian}for the high point of pipeline maximum intensity pressure test pressure value allowed to bear.