CN103364287A - Sulfuretted hydrogen stress corrosion resisting test loading method - Google Patents
Sulfuretted hydrogen stress corrosion resisting test loading method Download PDFInfo
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- CN103364287A CN103364287A CN2013102754051A CN201310275405A CN103364287A CN 103364287 A CN103364287 A CN 103364287A CN 2013102754051 A CN2013102754051 A CN 2013102754051A CN 201310275405 A CN201310275405 A CN 201310275405A CN 103364287 A CN103364287 A CN 103364287A
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- pressurization
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Abstract
The invention provides a sulfuretted hydrogen stress corrosion resisting test loading method. The method comprises the following steps of: directly pressing a loading system, directly and accurately obtaining pressure born by a stress ring by adopting a mode of loading accurate deformation offset for a plurality of times and by utilizing a displacement sensor and a pressure sensor. The sulfuretted hydrogen stress corrosion resisting test loading method provided by the invention has the advantages that a deformation offset problem generated by different loading modes is overcome, thus the accurate loading is realized, and meanwhile, the realization manner is simple, feasible, safe and reliable.
Description
Technical field
The present invention relates to technical field of measurement and test, relate in particular 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 comparatively distinct issues of petrochemical industry.Particularly H 2 S stress corrosion ftractures that caused accident happens suddenly often, catastrophic.Therefore, the correlative study of carrying out H 2 S stress corrosion has important theoretical and practical significance for the safe handling of guaranteeing petrochemical equipment and the production efficiency that improves petrochemical industry.
Stress loop is that method A(is permanent load tension test method among the standard NACE TM0177-2005 of NACE in order to satisfy, and experiment is adopted in the saturated hydrogen sulfide solution and soaked) and custom-designed.Usually stress loop adopts precision optical machinery processing, makes with alloy steel.During use, the wrench adjustment screw bolt and nut of employing standard changes the tensile force on the stress loop quickly and easily.
The deformation of stress loop and the load corresponding relation linearity are high, and NACE TM0177 standard-required load error is not higher than 2%.
Yet in actual loaded, along with the increase of load, the moment of torsion that wrench applies is also increasing.When from target deformation near the time, the required moment of torsion of wrench almost reaches maximal value.The operator is applying in the situation of high pulling torque, simultaneously will be with extremely slow speed approximation theory deformation, and the operation easier of this moment is quite large.When needs test batch to be tested, the situation of loaded load fluctuation also can appear, affect test findings.
When automatically loading, directly pressurize to stress loop by pressing plate, thereby make stress loop produce deformation.Yet when pressing plate was recalled, because nut and test specimen, screw rod and nut, and all there was the gap in the stress loop earth pressure release between nut and the stress loop, so after suddenly stressed, the deformation of pressure rings can not keep, and can diminish.Consequently, actual loaded pressure is less than the 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 address the above problem, the invention provides a kind of anti-H 2 S stress corrosion test loading method, operation easier is large and load fluctuation can occur in the time of can overcoming stress loop and load, thereby accomplishes accurate loading; The implementation simple and feasible is 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 the repeated loading method, utilize the sensor detection part to change displacement into pressure by links such as pressurization, detection, measurement calculating, obtain the force value that at every turn need to compensate, thereby 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 with pressure rings, this system comprises frame, transmission pressing mechanism and stress loop location-plate, wherein: stress loop location-plate level places the frame bottom, the transmission pressing mechanism is positioned at frame and vertically places stress loop location-plate top, the transmission pressing mechanism comprises: stepper motor, synchronous belt drive mechanism, upright driving mechanism and connection pressing mechanism, stepping motor fixedly places upper rack and links to each other with an 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 and be fixedly installed on the upright driving mechanism lower end and be positioned at stress loop to be measured top, comprise step:
Step (1): determine stress loop elemental height H
1, target setting loaded load P, and the permissible error scope of setting stress loop target deformation;
Step (2): the counter stress ring pressurizes for the first time, stops pressurization until the force value that pressure rings is born is P, records the stress loop height H this moment
2
Step (3): fixed stress annular variable, stop pressurization, for the first time pressurization finishes, and records the stress loop height H this moment
3
Step (4): the counter stress ring pressurizes for the second time, until the force value that pressure rings is born is P
1Stop pressurization,
Record stress loop height 2H this moment
2-H
3
Step (5): fixed stress annular variable, stop pressurization, for the second time pressurization finishes, and records the stress loop height H this moment
4
Step (6): if H
4With H
2Error in the permissible error scope, loading is finished; If H
4With H
2Error exceed the permissible error scope, proceed " pressurization, pressurization finish, measure the stress loop height " process, until pressurization finish after stress loop height and H
2Error in the permissible error scope, loading is finished.
Further, in the step (2), adopts pressure sensor detects the force value that stress loop is born.
Further, in the step (3), screw the nut that is positioned at the stress loop upper surface and contacts with the stress loop upper surface with fixed stress annular variable.
Further, in the step (3), select the spacing spanner to screw nut in the employing.
Further, in the step (5), screw the nut that is positioned at the stress loop upper surface and contacts with the stress loop upper surface with fixed stress annular variable.。
Further, in the step (4), adopts pressure sensor detects the force value that stress loop is born.
Further, the permissible error scope refers to that pressurization finishes rear stress loop height and and H
2Between error be no more than H
25%.
Further, proceeding in the step (6) " pressurization, pressurization finish ", stress loop height and H after pressurization finishes each time
2Between error determine the next time target load of pressurization.
Further, proceeding in the step (6) " pressurization, pressurization finish ", the target load of pressurization is for the third time:
Anti-H 2 S stress corrosion test loading method provided by the invention is on H 2 S stress corrosion test auto-loading system, repeated loading, utilize the sensor detection part to change displacement into pressure by links such as pressurization, detection, measurement calculating, obtain the force value that at every turn need to compensate, thereby obtain final accurate target load value, can quick flat load quietly and obtain the target on-load pressure, has accurate positioning, the time-saving and efficiency, reliability is high, practical characteristics can satisfy the needs that a series of H 2 S stress corrosions are tested.
Below in conjunction with accompanying drawing, embodiments of the invention are described.
Description of drawings
Fig. 1 is the synoptic diagram of the anti-H 2 S stress corrosion test loading method in the 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 the preferred embodiment of the present invention.
Embodiment
Be further described below in conjunction with the technical scheme of accompanying drawing to preferred embodiment of the present invention.
In the present embodiment, anti-H 2 S stress corrosion test loading method may further comprise the steps:
(1) determine initial position: the stress loop elemental height is H
1, the target setting loaded load is P;
(2) for the first time pressurization: system's briquetting is pressed to the stress loop upper surface under driven by motor, just stops pressurization until the force value that pressure transducer detects is P, and record the stress loop height this moment is H
2, stress loop shape becomes H
1-H
2, stress loop is linear rigidity in effective range, then can get stress loop rigidity by the distortion of the stress loop at load place to be:
(3) pressurization finishes for the first time: screw nut, then the briquetting rollback pressurizes for the first time and finishes.
Further, select the spacing spanner to screw nut in the step (3).
Because there is the gap between the bolt and nut, and the impact of the factors of the stressed rear distortion of stress loop, after pressurization finishes, stress loop meeting resilience; After recording resilience, the stress loop height is H
3According to load-deformation pattern, as can be known, suffered load p corresponding to stress loop distortion this moment ' less than the target loaded load P that sets, stress loop deflection error is:
Δx=H
3-H
2。
(4) for the second time pressurization
The stress loop deflection of this moment does not reach H
2, distance H
2Poor Δ x also, for this reason, driven by motor briquetting reply stress loop is again to pressing down Δ x.Because under large load, whole system is stressed all to produce distortion.Therefore the displacement that is difficult to control motor reaches the real deformation of stress loop.So change displacement into pressure.According to distortion-load diagram, as can be known, for the counter stress ring again to pressing down Δ x, make the deflection of stress loop will reach H
2+ Δ x, at this moment corresponding loaded load P
1, can be calculated by stress loop rigidity:
So motor should drive briquetting and be depressed into loaded load P
1Till, this moment, corresponding stress loop height was 2H
2-H
3, the stress loop shape of this moment becomes: 2H
2-H
3-H
1
(5) pressurization finishes for the second time
Screw nut, then the briquetting rollback pressurizes for the second time and finishes.
Because there is the gap between the bolt and nut, and the impact of the factors that is out of shape after the test specimen tension, under the effect of this load, stress loop meeting resilience, the stress loop height that records this moment is H
4
Stress loop was out of shape suffered load and was compared with the suffered load of distortion behind the rollback that pressurizes for the first time this moment, and is slightly larger, but very approaching.Therefore in the little situation of target load P, the difference between the two is very little, and the stress loop deflection error that causes is also very little.
Under identical load, the resilience that stress loop occurs is also consistent.Therefore for the second time after pressurization finished, snap-off-distance was identical with snap-off-distance after the first pressurization, H
4≈ H
2, cause pressurization to finish rear stress loop and recoil to object height H
2Finished the pressurization target.
Further, in the larger situation of target load, for the first time after the pressurization with for the second time pressurization after, the suffered load of stress loop differs larger, so the resilience of stress loop is not identical yet, H
4H
2, the result that can cause pressurizeing has larger deviation.Can pressurize for the third time this moment.
Situation and first, second time of pressurization are similar for the third time.Different is that target load at this moment is:
Stress loop recoiled to object height H after pressurization finished
2Finished the pressurization target.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all in the art technician all should be in the determined protection domain by 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 is tested loading method, and described method is applied to the anti-H 2 S stress corrosion test auto-loading system with pressure rings, it is characterized in that, comprises step:
Step (1): determine stress loop elemental height H
1, target setting loaded load P, and the permissible error scope of setting stress loop target deformation;
Step (2): the counter stress ring pressurizes for the first time, stops pressurization until the force value that pressure rings is born is P, records the stress loop height H this moment
2
Step (3): fixed stress annular variable, stop pressurization, for the first time pressurization finishes, and records the stress loop height H this moment
3
Step (4): the counter stress ring pressurizes for the second time, until the force value that pressure rings is born is P
1Stop pressurization,
Record stress loop height 2H this moment
2-H
3
Step (5): fixed stress annular variable, stop pressurization, for the second time pressurization finishes, and records the stress loop height H this moment
4
Step (6): if H
4With H
2Error in the permissible error scope, loading is finished; If H
4With H
2Error exceed the permissible error scope, proceed " pressurization, pressurization finish, measure the stress loop height " process, until pressurization finish after stress loop height and H
2Error in the permissible error scope, loading is finished.
2. anti-H 2 S stress corrosion test loading method according to claim 1 is characterized in that in the step (2), adopts pressure sensor detects the force value that stress loop is born.
3. anti-H 2 S stress corrosion according to claim 1 test loading method is characterized in that, in the step (3), screws the nut that is positioned at the stress loop upper surface and contact with the 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 the step (3), selects the spacing spanner to screw nut in the employing.
5. anti-H 2 S stress corrosion according to claim 1 test loading method is characterized in that, in the step (5), screws the nut that is positioned at the stress loop upper surface and contact with the 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 the step (4), adopts pressure sensor detects the force value that stress loop is born.
7. anti-H 2 S stress corrosion test loading method according to claim 1 is characterized in that, the permissible error scope refers to that pressurization finishes 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 in the step (6) " pressurization, pressurization finish ", stress loop height and H after pressurization finishes each time
2Between error determine the next time target load of pressurization.
9. anti-H 2 S stress corrosion test loading method according to claim 1 is characterized in that, proceeding in the step (6) " pressurization, pressurization finish ", 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 CN103364287B (en) | 2015-08-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6739201B1 (en) * | 2000-09-20 | 2004-05-25 | Sandia Corporation | Micromechanical apparatus for measurement of forces |
| DE10256063A1 (en) * | 2002-11-30 | 2004-06-17 | Mahle Gmbh | Process for coating piston rings for internal combustion engines |
| CN2809627Y (en) * | 2005-07-04 | 2006-08-23 | 长安大学 | Corrosion fatigue tester |
| CN101377461A (en) * | 2007-08-28 | 2009-03-04 | 宝山钢铁股份有限公司 | Apparatus and method for measuring welding tube corrosion under stress condition |
| CN201408146Y (en) * | 2009-04-16 | 2010-02-17 | 上海海隆石油管材研究所 | Loading external member for preventing test sample from twisting in stress ring test |
| CN101793653A (en) * | 2010-02-11 | 2010-08-04 | 上海交通大学 | Automatic loading device of stress ring |
| CN201637639U (en) * | 2010-04-08 | 2010-11-17 | 中国石油集团工程设计有限责任公司 | Small-type annular constant stress gauge |
| CN101957287A (en) * | 2009-07-20 | 2011-01-26 | 中国科学院金属研究所 | Stress corrosion cracking loading method of pipe material |
| CN101988879A (en) * | 2009-08-04 | 2011-03-23 | 上海海隆石油管材研究所 | Sulphide stress corrosion uniaxial tensile test loading detection method and monitoring system thereof |
-
2013
- 2013-07-02 CN CN201310275405.1A patent/CN103364287B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6739201B1 (en) * | 2000-09-20 | 2004-05-25 | Sandia Corporation | Micromechanical apparatus for measurement of forces |
| DE10256063A1 (en) * | 2002-11-30 | 2004-06-17 | Mahle Gmbh | Process for coating piston rings for internal combustion engines |
| CN2809627Y (en) * | 2005-07-04 | 2006-08-23 | 长安大学 | Corrosion fatigue tester |
| CN101377461A (en) * | 2007-08-28 | 2009-03-04 | 宝山钢铁股份有限公司 | Apparatus and method for measuring welding tube corrosion under stress condition |
| CN201408146Y (en) * | 2009-04-16 | 2010-02-17 | 上海海隆石油管材研究所 | Loading external member for preventing test sample from twisting in stress ring test |
| CN101957287A (en) * | 2009-07-20 | 2011-01-26 | 中国科学院金属研究所 | Stress corrosion cracking loading method of pipe material |
| CN101988879A (en) * | 2009-08-04 | 2011-03-23 | 上海海隆石油管材研究所 | Sulphide stress corrosion uniaxial tensile test loading detection method and monitoring system thereof |
| CN101793653A (en) * | 2010-02-11 | 2010-08-04 | 上海交通大学 | Automatic loading device of stress ring |
| CN201637639U (en) * | 2010-04-08 | 2010-11-17 | 中国石油集团工程设计有限责任公司 | Small-type annular constant stress gauge |
Non-Patent Citations (2)
| Title |
|---|
| 王荣 等: "应力环在氢脆控制试验中的应用", 《理化检验－物理分册》, vol. 39, no. 12, 31 December 2003 (2003-12-31), pages 623 - 625 * |
| 黄仲婴 等: "硫化物应力腐蚀开裂试验应力环载荷的测量及标定", 《理化检验－物理分册》, vol. 46, no. 3, 31 March 2010 (2010-03-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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