CN103364287B - A kind of anti-H 2 S stress corrosion test loading method - Google Patents
A kind of anti-H 2 S stress corrosion test loading method Download PDFInfo
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- CN103364287B CN103364287B CN201310275405.1A CN201310275405A CN103364287B CN 103364287 B CN103364287 B CN 103364287B CN 201310275405 A CN201310275405 A CN 201310275405A CN 103364287 B CN103364287 B CN 103364287B
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- stress
- pressurization
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Abstract
The invention provides a kind of anti-H 2 S stress corrosion test loading method, the method is to loading system direct weighting, adopt repeated loading fine compensation deformation skew, the pressure utilizing displacement transducer, pressure transducer to obtain stress loop directly, exactly to bear.Anti-H 2 S stress corrosion test loading method provided by the invention can overcome the deflection offset problem produced due to load mode difference, thus accomplishes accurate loading; Implementation simple and feasible, safe and reliable simultaneously.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly relate to a kind of anti-H 2 S stress corrosion test loading method.
Background technology
At present, in petrochemical industry, along with the increase of Processing High-sulfur High-Acidity Crude Oils processing capacity, sulfuretted hydrogen is also further serious to the corrosion of equipment, has become petrochemical industry comparatively distinct issues.That accident particularly caused by hydrogen sulfide splitting happens suddenly often, catastrophic.Therefore, the correlative study carrying out H 2 S stress corrosion has important theoretical and practical significance for the safe handling guaranteeing petrochemical equipment and the production efficiency that improves petrochemical industry.
Stress loop is for meeting method A(and permanent load tension test method in NACE standard NACE TM0177-2005, and experiment adopts in saturated hydrogen sulfide solution soaks) and custom-designed.Usual stress loop adopts precision optical machinery processing, manufactures with alloy steel.During use, the wrench adjustment screw bolt and nut of employing standard changes the tensile force in stress loop quickly and easily.
Deformation and the load corresponding relation linearity of stress loop are high, and NACE TM0177 standard-required load error is not higher than 2%.
But in actual loaded, along with the increase of load, the moment of torsion that wrench applies is also increasing.When from target deformation close to time, the moment of torsion needed for wrench almost reaches maximal value.Operator, simultaneously will with extremely slow speed approximation theory deformation when applying high pulling torque, and operation easier is now quite large.When needs test batch to be tested, also there will be the situation of loaded load fluctuation, affect test findings.
When automatically loading, pressurizeed directly to stress loop by pressing plate, thus make stress loop produce deformation.But when pressing plate is recalled, stress loop earth pressure release, due to nut and test specimen, screw rod and nut, and all exists gap between nut and stress loop, therefore after suddenly stressed, the deformation of pressure rings can not keep, and can diminish.Consequently, actual loaded pressure is less than target on-load pressure.
Therefore, those skilled in the art is devoted to develop a kind of novel anti-hydrogen sulfide stress corrosion (cracking) test loading method.
Summary of the invention
In order to solve the problem, the invention provides a kind of anti-H 2 S stress corrosion test loading method, operation easier when stress loop loads can be overcome large and load fluctuation can occur, thus accomplishing accurate loading; Implementation simple and feasible, safe and reliable simultaneously.
For achieving the above object, design of the present invention is on anti-H 2 S stress corrosion test auto-loading system, adopt repeated loading method, utilize sensor detection part by displacive transformation for pressure is by links such as pressurization, detection, survey calculation, obtain each force value needing to compensate, thus obtain final accurate target load value.
Anti-H 2 S stress corrosion test loading method provided by the invention, be applied to the anti-H 2 S stress corrosion test auto-loading system of band pressure rings, this system comprises frame, transmission pressing mechanism and stress loop location-plate, wherein: stress loop location-plate level is placed in bottom frame, transmission pressing mechanism is positioned at frame and is vertically placed in above stress loop location-plate, transmission pressing mechanism comprises: stepper motor, synchronous belt drive mechanism, upright driving mechanism and connection pressing mechanism, stepping motor is fixedly placed in upper rack and is connected with one end of synchronous belt drive mechanism, the other end of synchronous belt drive mechanism is connected with upright driving mechanism, upright driving mechanism vertically rotates and is arranged at upper rack, connect pressing mechanism be fixedly installed on upright driving mechanism lower end and be positioned at above stress loop to be measured, comprise step:
Step (1): identified sign ring elemental height H
1, target setting loaded load P, and the permissible error scope setting the deformation of stress loop target;
Step (2): the first time pressurization of counter stress ring, until the force value that pressure rings is born is P stop pressurization, now records stress loop height H
2;
Step (3): fixed stress annular variable, stops pressurization, and end of pressurizeing for the first time, now records stress loop height H
3;
Step (4): counter stress ring second time pressurization, until the force value that pressure rings is born is P
1stop pressurization,
now record stress loop height 2H
2-H
3;
Step (5): fixed stress annular variable, stops pressurization, and end of pressurizeing for the second time, now records stress loop height H
4;
Step (6): if H
4with H
2error within the scope of permissible error, loading completes; If H
4with H
2error exceed permissible error scope, proceed " pressurization, pressurization terminate, measure stress loop height " process, until pressurization terminates rear stress loop height and H
2error within the scope of permissible error, loading completes.
Further, in step (2), adopt the force value that pressure transducer detection stress loop is born.
Further, in step (3), screw be positioned at stress loop upper surface and the nut contacted with stress loop upper surface with fixed stress annular variable.
Further, in step (3), in employing, select spacing spanner tightening nut.
Further, in step (5), screw be positioned at stress loop upper surface and the nut contacted with stress loop upper surface with fixed stress annular variable.。
Further, in step (4), adopt the force value that pressure transducer detection stress loop is born.
Further, permissible error scope refers to that pressurization terminates rear stress loop height and and H
2between error be no more than H
25%.
Further, proceeding " pressurization, pressurization terminate " in step (6), the stress loop height after pressurization each time terminates and H
2between error determine the target load that next time pressurizes.
Further, proceeding " pressurization, pressurization terminate " in step (6), the target load that third time pressurizes is:
Anti-H 2 S stress corrosion test loading method provided by the invention is on sulfide stress corrosion cracking test auto-loading system, repeated loading, utilize sensor detection part by displacive transformation for pressure is by links such as pressurization, detection, survey calculation, obtain each force value needing to compensate, thus obtain final accurate target load value, quick smoothly can load and obtain target on-load pressure, there is accurate positioning, time-saving and efficiency, reliability is high, practical feature, can meet the needs of a series of sulfide stress corrosion cracking test.
Below in conjunction with accompanying drawing, embodiments of the invention are described.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the anti-H 2 S stress corrosion test loading method in a preferred embodiment of the present invention.
Fig. 2 is the distortion-load diagram of the anti-H 2 S stress corrosion test loading method in a preferred embodiment of the present invention.
Embodiment
Be further described below in conjunction with the technical scheme of accompanying drawing to present pre-ferred embodiments.
In the present embodiment, anti-H 2 S stress corrosion test loading method, comprises the following steps:
(1) initial position is determined: stress loop elemental height is H
1, target setting loaded load is P;
(2) first time pressurization: system briquetting presses to stress loop upper surface under driven by motor, until the force value that pressure transducer detects is P just stop pressurization, now recording stress loop height is H
2, stress loop shape becomes H
1-H
2, stress loop is linear rigidity in effective range, then can obtain stress loop rigidity by the stress loop distortion of load to be:
(3) first time pressurizes ends: tightening nut, then briquetting rollback, end of pressurizeing for the first time.
Further, spacing spanner tightening nut is selected in step (3).
Owing to there is gap between bolt and nut, and the impact of the factors of the stressed rear distortion of stress loop, after pressurization terminates, stress loop meeting resilience; After recording resilience, stress loop height is H
3; According to load-deflection figure, known, the suffered load p that now stress loop distortion is corresponding ' be less than the target loaded load P of setting, stress loop deflection error is:
Δx=H
3-H
2。
(4) second time pressurization
Stress loop deflection does not now reach H
2, distance H
2also poor Δ x, for this reason, driven by motor briquetting reply stress loop is again to pressing down Δ x.Due under a large load, whole system is stressed all produces distortion.Therefore the displacement of control motor is difficult to reach the real deformation of stress loop.So be pressure by displacive transformation.According to distortion-load diagram, known, in order to counter stress ring is again to pressing down Δ x, make the deflection of stress loop reach H
2+ Δ x, now corresponding loaded load P
1, can be calculated by stress loop rigidity:
So motor should drive briquetting to be depressed into loaded load P
1till, now corresponding stress loop height is 2H
2-H
3, stress loop shape now becomes: 2H
2-H
3-H
1.
(5) second time is pressurizeed end
Tightening nut, then briquetting rollback, end of pressurizeing for the second time.
Owing to there is gap between bolt and nut, and the impact of the factors be out of shape after test specimen tension, under the effect of this load, stress loop meeting resilience, the stress loop height recorded now is H
4.
Be out of shape compared with suffered load after the suffered load of now stress loop distortion and the rollback that pressurizes for the first time, more bigger, but closely.Therefore when target load P is little, the difference between both is very little, and the stress loop deflection error caused is also very little.
Under identical load, the resilience that stress loop occurs is also consistent.Therefore, after second time pressurization terminates, snap-off-distance is identical with the snap-off-distance after the first pressurization, H
4≈ H
2, cause pressurization to terminate rear stress loop and recoil to object height H
2.Complete pressurization target.
Further, when target load is larger, after pressurizeing with second time after first time pressurization, suffered by stress loop, load difference is comparatively large, and therefore the resilience of stress loop is not identical yet, H
4>H
2, pressurization result can be caused to have larger deviation.Now can carry out third time pressurization.
Third time pressurization situation and first, second time similar.Unlike target load be now:
Pressurization terminates rear stress loop and recoils to object height H
2.Complete pressurization target.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. an anti-H 2 S stress corrosion test loading method, described method is applied to the anti-H 2 S stress corrosion test auto-loading system of band pressure rings, it is characterized in that, comprises step:
Step (1): identified sign ring elemental height H
1, target setting loaded load P, and the permissible error scope setting the deformation of stress loop target;
Step (2): the first time pressurization of counter stress ring, until the force value that pressure rings is born is P stop pressurization, now records stress loop height H
2;
Step (3): after first time pressurization terminates, fixed stress annular variable, now records stress loop height H
3;
Step (4): counter stress ring second time pressurization, until the force value that pressure rings is born is P
1stop pressurization,
now record stress loop height 2H
2-H
3;
Step (5): after second time pressurization terminates, fixed stress annular variable, now records stress loop height H
4;
Step (6): if H
4with H
2error within the scope of permissible error, loading completes; If H
4with H
2error exceed permissible error scope, proceed " pressurization, pressurization terminate, measure stress loop height " process, until pressurization terminates rear stress loop height and H
2error within the scope of permissible error, loading completes.
2. anti-H 2 S stress corrosion test loading method according to claim 1, is characterized in that, in step (2), adopts the force value that pressure transducer detection stress loop is born.
3. anti-H 2 S stress corrosion according to claim 1 test loading method, is characterized in that, in step (3), screw be positioned at stress loop upper surface and nut contact with stress loop upper surface with the annular variable of fixed stress.
4. anti-H 2 S stress corrosion test loading method according to claim 3, is characterized in that, in step (3), select spacing spanner tightening nut in employing.
5. anti-H 2 S stress corrosion according to claim 1 test loading method, is characterized in that, in step (5), screw be positioned at stress loop upper surface and nut contact with stress loop upper surface with the annular variable of fixed stress.
6. anti-H 2 S stress corrosion test loading method according to claim 1, is characterized in that, in step (4), adopts the force value that pressure transducer detection stress loop is born.
7. anti-H 2 S stress corrosion test loading method according to claim 1, is characterized in that, permissible error scope refers to that pressurization terminates rear stress loop height and and H
2between error be no more than H
25%.
8. anti-H 2 S stress corrosion test loading method according to claim 1, is characterized in that, proceeding " pressurization, pressurization terminate " in step (6), the stress loop height after pressurization each time terminates and H
2between error determine the target load that next time pressurizes.
9. anti-H 2 S stress corrosion test loading method according to claim 1, is characterized in that, proceeding " pressurization, pressurization terminate " in step (6), and the target load of pressurization is for the third time:
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| CN201310275405.1A CN103364287B (en) | 2013-07-02 | 2013-07-02 | A kind of anti-H 2 S stress corrosion test loading method |
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| CN103364287B true CN103364287B (en) | 2015-08-12 |
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| CN105948932A (en) * | 2016-05-20 | 2016-09-21 | 太仓市雅丰农场专业合作社 | Liquid fertilizer made of aquatic plants |
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