CN105675277B - One kind opens entirely or Low lift safety valve Opening pressure intelligence method of calibration - Google Patents
One kind opens entirely or Low lift safety valve Opening pressure intelligence method of calibration Download PDFInfo
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- CN105675277B CN105675277B CN201610025666.1A CN201610025666A CN105675277B CN 105675277 B CN105675277 B CN 105675277B CN 201610025666 A CN201610025666 A CN 201610025666A CN 105675277 B CN105675277 B CN 105675277B
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- inflection point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- General Physics & Mathematics (AREA)
- Safety Valves (AREA)
- Emergency Alarm Devices (AREA)
Abstract
It is opened entirely or Low lift safety valve Opening pressure intelligence method of calibration the present invention relates to a kind of, it is characterised in that step is as follows：（1）The position that the inflection point slope γ of pressure time curve occurs is calculated, when γ is more than or equal to known parameters, then corresponding pressure meets the requirements, and judges into next step；（2）There is step during declining in pressure release（1）The inflection point slope that goes out of condition judgment；（3）Judge at the larger change of slope whether be required inflection point.While inflection point occurs, if operating personnel hear the normal sound that safety valve is opened, judge the Opening pressure for qualified Opening pressure.Otherwise need that safety valve is adjusted or repaired, duplication check to qualified Opening pressure.This method is capable of the Opening pressure of automatic decision safety valve, as a result accurately and reliably.
Description
Technical field
It is opened entirely or Low lift safety valve Opening pressure intelligence method of calibration the present invention relates to a kind of, belongs to pressure-bearing special type and set
Standby detection technique field concretely relates to Opening pressure scope in 0.1Mpa~42Mpa, and medium is air, vapor, water
With the opening pressure of safety valve intelligence method of calibration on the pressure vessel, pressure pipeline and mechanical equipment of other chemical substances.
Background technology
Safety valve is divided into two kinds of complete opening type and micro-open type according to opening feature, and micro-open type refers to that the Lift of flap is valve
The 1/40~1/20 of seat larynx footpath, complete opening type refer to that the Lift of flap is the 1/4 of valve seat larynx footpath.It is it follows that different classes of
The acting characteristic of safety valve have a very big difference, the acting characteristic of fall lift safety valve belongs to two sections of action types, pressure during unlatching
Curve has an apparent inflection point, and Low lift safety valve is circular arc type, inflection point unobvious, as the pressure curve of fall lift safety valve approaches
The micro-open type of same size, then the performance of the safety valve has not met the requirement of fall lift safety valve, also, same type
Different latus rectums and pressure safety valve unlatching curve it is also variant, it is necessary to formulate a series of Rule of judgment intelligent to sentence
The qualified Opening pressure of the safety valve of disconnected different type, pressure and latus rectum.
The content of the invention
The present invention is to inventor's patent application《A kind of low redundancy high-reliability safety valve intelligence calibration equipment and
Its method of calibration》(application number：2012103614580) improvement, can be accurately in automatic decision technical field using this method
All models safety valve Opening pressure.
The purpose of the present invention is what is be achieved through the following technical solutions：
The pressure signal of detection is converted into current signal transfer and adopts module, data acquisition module to data by pressure transmitter
The analog current signal of detection is changed into digital voltage signal and is transferred to tablet computer drafting pressure value real-time curve, system is soft
Part carries out algorithm process according to Opening pressure judgment criterion to the pressure value curve of verification, realizes that intellectual determination this time verifies peace
The Opening pressure of full valve.
It is complete to open or Low lift safety valve Opening pressure intelligence method of calibration, the Opening pressure judgment criterion based on safety valve
Judged using bathmometry, key step is as follows：
(1) inflection point is automatically selected according to safe valve-type, parameter and judges parameter area, it is bent to obtain pressure time by formula (I)
The position that the inflection point slope of line occurs：
In formula (I), γ is the inflection point slope value of pressure curve；X [i] is the pressure value through analog-to-digital conversion；I, k is respectively to pass through
The corresponding integer sequence number point of pressure value of analog-to-digital conversion；
When γ judges parameter more than or equal to inflection point, progress judges in next step；
The intelligent verification inflection point of safety valve judges that parameter is opened by the type (complete opening type, micro-open type) of safety valve, safety valve
It opens the scope of pressure (Pg, MPa) and inside nominal diameter (DN, mm) determines, (fall lift safety valve is intelligent referring in particular to table 1
Verification inflection point judges parameter) and table 2 (the intelligent verification inflection point of Low lift safety valve judges parameter).
Table 1
Table 2
(2) judge that whether pressure is still in uphill process near inflection point
Occur the inflection point slope that the condition judgment of step (1) goes out during declining using formula (II) pressure release, prevent out
Existing false judgment：
In formula (II), Δ is the difference of the sum of 2 sections of analog-to-digital conversion pressure values on pressure curve；
Work as △>When 0, pressure is just in uphill process；As △=0, pressure is steady state value；Work as △<When 0, pressure is in
Decline process；
(3) judge at the larger change of slope whether be required inflection point
When an inflection point occurs, multiple measurement points are had in its vicinity and are met the requirements, occur error in judgement in order to prevent,
Judge in the following way：
A) number of the measurement point met the requirements in continuous 10 measurement points is more than 5, then judges to think have inflection point to occur,
And pressure value of the satisfactory point of first γ value as inflection point is taken, when inflection point occurs, corresponding pressure is opening for verification
Open pressure；
B) after an inflection point is judged, 20 measurement points behind are no longer judged, are continuously sentenced with preventing
Disconnected is same inflection point.
When inflection point occurs, the Opening pressure that as verifies, while operating personnel can hear the sound that safety valve is opened.If
It is normal that the safety valve that operator hears, which opens sound, then judges the Opening pressure for qualified Opening pressure.Otherwise it is, it is necessary to right
Safety valve is placed under repair, disintegrates, cleans, ground, and duplication check is tested to qualified Opening pressure.
Advantageous effect：This method is according to the unlatching interpretational criteria opened entirely with the formulation of Low lift safety valve acting characteristic, is made
Software systems are capable of the Opening pressure of automatic decision safety valve, and criterion includes the Opening pressure that Opening pressure inflection point judges, refines
Inflection point judges the rules such as parameter, the exclusion of invalid inflection point, makes safety valve intelligence check results accurately and reliably.
Description of the drawings
Fig. 1 is unlatching value analysis and Control program module operational flow diagram；
Fig. 2 is that A48Y-40 fall lift safety valves are actually verifying running real-time pressure data used by embodiment 1
Graph；The Opening pressure deterministic process of Low lift safety valve is identical with fall lift safety valve, but γ values are chosen according to table 2.
Specific embodiment
Below with reference to drawings and examples, the technical solution of the application is illustrated：
Embodiment 1
The present embodiment using model A48Y-40, inside nominal diameter (DN) is 15mm, Opening pressure (Pg) is
2.55MPa fall lift safety valve.
3, Fig. 2 is shown in Table using the data obtained by the intelligent method of calibration of the application near inflection point, is taken as γ according to table 1
1.001, then Rule of judgment is as follows：
(1) inflection point slope γ>1.001；
(2)Δ>0；
(3) measurement point met the requirements in continuous 10 measurement points, and number is more than 5, then judges to think there is inflection point appearance
, and take point pressure value as inflection point of first γ value more than 1.001.
A row represent whether (0 foot with thumb down, 1 represents full to γ more than γ listed by table 1 according to obtained by calculating formula (I) in table 3
Foot), B list shows whether Δ is more than 0 (0 foot with thumb down, 1 represents to meet), and C row represent whether γ, Δ are satisfied by requirement (0 table
Show and be unsatisfactory for, 1 represents to meet), whether the number that D row represent to meet the requirements in continuous 10 numerical value of C row is more than 5, and (0 is with thumb down
Foot, 1 represents to meet).
All occur inflection point when in Fig. 2 near i=33, i=98, i=268, i=508, i=533, but combine table 3,
Understand that, just to meet the inflection point of the Opening pressure of above-mentioned condition at i=268, pressure value (Xi) is 2.549Mpa this moment.If operation
It is normal that the safety valve that member hears, which opens sound, then judges the pressure for qualified Opening pressure.Otherwise, it is necessary to safety valve into
Row repairing, disintegration, cleaning, grinding etc., duplication check is tested to qualified Opening pressure.
The actual verification operation data (data near inflection point) of table 3
Claims (5)
- It is opened or Low lift safety valve Opening pressure intelligence method of calibration 1. complete, it is characterised in that step is as follows：(1) inflection point is automatically selected according to safe valve-type, parameter and judges parameter area, pressure time curve is obtained by formula (I) The position that inflection point slope occurs：In formula (I), γ is the inflection point slope value of pressure curve；X [i] is the pressure value through analog-to-digital conversion；I, k is respectively through modulus The corresponding integer sequence number point of pressure value of conversion；When γ judges parameter more than or equal to inflection point, judge into next step；(2) judge that whether pressure is still in uphill process near inflection pointOccur the inflection point slope that the condition judgment of step (1) goes out during declining using formula (II) pressure release, prevent mistake Erroneous judgement：In formula (II), Δ is the difference of the sum of 2 sections of analog-to-digital conversion pressure values on pressure curve；Work as △>When 0, pressure is just in uphill process；As △=0, pressure is steady state value；Work as △<When 0, pressure, which is in, to be declined Process；(3) judge at the larger change of slope whether be required inflection pointWhen an inflection point occurs, multiple measurement points are had in its vicinity and are met the requirements, occur error in judgement in order to prevent, use Following manner judges：A) number of the measurement point met the requirements in continuous 10 measurement points is more than 5, then judges to think have inflection point to occur, and take Pressure value of the satisfactory point of first γ value as inflection point, when inflection point occurs, corresponding pressure is the unlatching pressure verified Power；B) after an inflection point is judged, 20 measurement points behind are no longer judged, to prevent what is continuously judged It is same inflection point.
- It complete is opened or Low lift safety valve Opening pressure intelligence method of calibration 2. according to claim 1, it is characterised in that The inflection point judges that parameter is determined by the type of safety valve, the scope of opening pressure of safety valve and inside nominal diameter.
- It complete is opened or Low lift safety valve Opening pressure intelligence method of calibration 3. according to claim 2, it is characterised in that The type of safety valve is to open entirely or Low lift safety valve.
- It complete is opened or Low lift safety valve Opening pressure intelligence method of calibration 4. according to claim 1, it is characterised in that While inflection point occurs, if operating personnel hear the normal sound that safety valve is opened, judge that the Opening pressure is opened for qualification Pressure.
- It complete is opened or Low lift safety valve Opening pressure intelligence method of calibration 5. according to claim 1, it is characterised in that While inflection point occurs, if operating personnel hear the abnormal sound that safety valve is opened, need to place under repair to safety valve, solve Body, cleaning, grinding, duplication check are tested to qualified Opening pressure.
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| CN201610025666.1A CN105675277B (en) | 2016-01-14 | 2016-01-14 | One kind opens entirely or Low lift safety valve Opening pressure intelligence method of calibration |
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| EP0521694A1 (en) * | 1991-07-01 | 1993-01-07 | Continental Field Machining Co., Inc. | Relief valve testing apparatus |
| CN2748899Y (en) * | 2004-11-08 | 2005-12-28 | 徐权 | Safety valve on-line detector |
| CN101403657A (en) * | 2008-11-07 | 2009-04-08 | 南京市锅炉压力容器检验研究院 | Calibration apparatus and method for ultra-high pressure safety valve |
| CN102721534A (en) * | 2011-03-30 | 2012-10-10 | 沈阳沃达科技有限公司 | Detection method for safety valves of storage battery and apparatus thereof |
| CN102866008A (en) * | 2012-09-26 | 2013-01-09 | 南京市锅炉压力容器检验研究所 | Low-redundancy high-reliability intelligent checking device for safety valves and checking method utilizing checking device |
| CN103900803A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Machine-controlled safety valve detection method and device |
| CN203785867U (en) * | 2013-11-29 | 2014-08-20 | 成都施泰欧科技有限公司 | Safety valve online verification and adjustment device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3153364B2 (en) * | 1992-11-30 | 2001-04-09 | 株式会社福井製作所 | Jack test method of safety valve |
-
2016
- 2016-01-14 CN CN201610025666.1A patent/CN105675277B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0521694A1 (en) * | 1991-07-01 | 1993-01-07 | Continental Field Machining Co., Inc. | Relief valve testing apparatus |
| CN2748899Y (en) * | 2004-11-08 | 2005-12-28 | 徐权 | Safety valve on-line detector |
| CN101403657A (en) * | 2008-11-07 | 2009-04-08 | 南京市锅炉压力容器检验研究院 | Calibration apparatus and method for ultra-high pressure safety valve |
| CN102721534A (en) * | 2011-03-30 | 2012-10-10 | 沈阳沃达科技有限公司 | Detection method for safety valves of storage battery and apparatus thereof |
| CN102866008A (en) * | 2012-09-26 | 2013-01-09 | 南京市锅炉压力容器检验研究所 | Low-redundancy high-reliability intelligent checking device for safety valves and checking method utilizing checking device |
| CN103900803A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Machine-controlled safety valve detection method and device |
| CN203785867U (en) * | 2013-11-29 | 2014-08-20 | 成都施泰欧科技有限公司 | Safety valve online verification and adjustment device |
Non-Patent Citations (1)
| Title |
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| "安全阀泄漏声发射检测试验研究";张忠政 等;《石油化工设备》;20111130;第40卷(第6期);第16-19页 * |
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Inventor after: Ye Cheng Inventor after: Zhang Binbin Inventor after: Zhou Xingpeng Inventor after: Zhu Xiaoxue Inventor before: Zhang Binbin Inventor before: Ye Cheng Inventor before: Zhou Xingpeng Inventor before: Zhu Xiaoxue |
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