WO2007080128A1 - Verfahren zur messtechnischen bestimmung des intervallendes eines prüfintervalls sowie vorrichtung zur durchführung des verfahrens - Google Patents
Verfahren zur messtechnischen bestimmung des intervallendes eines prüfintervalls sowie vorrichtung zur durchführung des verfahrens Download PDFInfo
- Publication number
- WO2007080128A1 WO2007080128A1 PCT/EP2007/000293 EP2007000293W WO2007080128A1 WO 2007080128 A1 WO2007080128 A1 WO 2007080128A1 EP 2007000293 W EP2007000293 W EP 2007000293W WO 2007080128 A1 WO2007080128 A1 WO 2007080128A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- load
- working
- determined
- value
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
Definitions
- the invention relates to a method for the metrological determination of the interval end of a test interval to be followed for carrying out a recurring test of pressure cycles subjected to load cycles in working cycles.
- pressure vessels subjected to alternating pressure are subjected to an estimation of the service life for determining the recurring test intervals, that is to say the recurring test intervals.
- the life of a pressure vessel is estimated by theoretically calculating the number of load cycles allowed for a pressure vessel, that is, the number of operating cycles allowed for a pressure vessel under design pressure, where design pressure is the maximum working pressure allowed for the pressure vessel.
- a work cycle is usually equated with a load change, assuming that that the pressure vessel is operated under design pressure at each cycle. As soon as half of the theoretically permissible load changes under design pressure have been reached, the end of the test interval has been reached and a recurrent test must be carried out.
- test intervals to be observed are set shorter than actually required, which leads to unnecessary checks, which are disadvantageous not least time-consuming and costly.
- a method for metrological determination of the end of a interval to carry out a recurring test of load cycles in load cycles pressure test containers to be followed test interval in which with a pressure sensor in the interior of the pressure vessel per work cycle actually reached maximum Operating pressure is measured, in which a load variable per duty cycle is determined on the basis of the measured per working cycle a load variable per work cycle, in which for several consecutive work cycles on the basis of each work cycle determined load values a resulting load value is determined, in which the resulting load value is compared with a predetermined comparison value in which a signal indicating that the end of the test interval has been reached is output as soon as the resulting load value equals or exceeds the predefinable comparison value lessness.
- the starting point for the method according to the invention is the recognition that the service life of a pressure vessel, that is to say the number of theoretically permissible work cycles, depends on the working pressures actually achieved in each case for each work cycle. According to the invention, it is therefore proposed to carry out the test interval determination not on the basis of the theoretically permissible design pressure, but on the basis of the working pressure actually achieved per working cycle. Unnecessarily short test intervals can be avoided in an advantageous manner.
- a load variable for the respective work cycle is determined on the basis of the working pressure measured per working cycle. This load quantity reflects the actual load of the pressure vessel, which results from the actual working pressure prevailing during this working cycle and detected by the pressure sensor.
- a resulting load value is then determined for several consecutive work cycles on the basis of the loading variables respectively determined for each work cycle. The resulting load value thus represents, in the manner of an "operating load collective", a measure of the load on the pressure vessel that accompanies several and possibly different working pressures under different working pressures.
- the resulting load value is compared with a predeterminable comparison value, wherein a signal indicating the reaching of the check interval end is output as soon as the resulting load value equals or exceeds the predeterminable comparison value.
- the recurrent test must be carried out when the end of the test interval has been reached, ie when the resulting load value meets or exceeds the predefinable reference value.
- test interval it is a significant advantage of the method of the invention that, to determine the end of the test interval, one is subjected to load cycling in order to perform a periodic test in cycles Pressure vessels to be observed test interval not on the maximum allowable working pressure, that is, the design pressure, but on the actual working pressures during the individual working cycles is turned off. In this way, the end of a test interval can be accurately and reliably determined while taking into account all safety-relevant aspects.
- the test intervals are not unnecessarily set too short, which is not least for reasons of cost advantage, since the number of recurring tests with respect to the entire life of a pressure vessel can be reduced.
- the load size is determined on the basis of the measured per working cycle, actual working pressure on the one hand and the number of theoretically possible at this working pressure working cycles.
- the resulting load value is determined as the sum of all load variables several consecutive work cycles.
- the resulting load value thus results as the sum of all load variables determined per work cycle and thus represents an operating load collective for several consecutive work cycles.
- the comparison value is determined as a fraction of the number of working cycles theoretically possible at the design pressure of the pressure vessel.
- the fraction is preferably chosen to be 0.5. Other fractions are of course also possible.
- the signal indicating the end of the test interval has been output acoustically and / or visually.
- the inventive method is carried out computerized according to a further feature of the invention, wherein a fully automatic operation is preferred. This allows a simple handling of the method according to the invention, wherein it may additionally be provided to display the currently valid load value and / or the predicted test interval end.
- the inventive method is particularly suitable in connection with vacuum and / or pressure furnaces, which are used for the treatment, in particular heat treatment of metallic workpieces.
- a special field of application is overpressure quenching chambers.
- the invention further proposes a device for carrying out the above-described method, which device is characterized by a pressure sensor and a control device.
- the control device in turn has a calculation unit and a comparison unit.
- a device in which the pressure sensor actually measures the maximum working pressure per working cycle, and outputs a signal corresponding to the measured working pressure to the calculation unit, where the calculation unit determines a load variable per working cycle on the basis of the signal supplied by the pressure sensor determined in which the calculation unit based on a plurality of load variables determines a resulting load value and in which the comparison unit compares the determined by the calculation unit resulting load value with a predetermined comparison value and outputs when equal and / or exceeding a signal.
- the device according to the invention makes it possible to exactly determine test intervals or their end in a simple manner, taking into account the actual working pressures prevailing during the individual work cycles.
- control device further comprises a memory unit which stores the measured working pressures, the load variables determined by the calculation unit stores the resulting load value determined by the calculation unit and / or the predeterminable comparison value.
- the stored data can be used for statistical purposes or for forecasts.
- a device in which the comparison unit compares the resulting load value determined by the calculation unit with a predeterminable comparison value after each performed work cycle. In this way, at the end of each working cycle, the instantaneous load value can be compared with the predeterminable comparison value, which makes it possible to determine at the end of each work cycle whether it is necessary to carry out a periodic check.
- FIG. 1 in a schematic representation of the device according to the invention
- Fig. 2 is a timing diagram.
- Fig. 1 the device according to the invention is shown in a schematic representation. This consists of a pressure sensor 2 and a control device 13, the control device 13 in turn having a calculation unit 3, a memory unit 4 and a comparison unit 5.
- the pressure sensor 2 is arranged inside the pressure vessel 1 in order to measure working pressures p prevailing in the interior of the pressure vessel 1.
- the control device 13 is arranged outside of the pressure vessel 1 and can be accommodated in a housing, not shown in FIG.
- the mitumfrissate by the control unit 13 comparison unit 5 is connected via a communication connection, which in the illustration of FIG. 1 by the Arrow 11 is shown connected to a display 6.
- the display 6 may be configured such that it emits acoustic and / or visual signals.
- the device shown in Fig. 1 is used for the metrological determination of the end of the interval of a load cycle for performing a periodic inspection of duty cycles AZ pressure vessels 1 to be observed test interval PI. This metrological determination is carried out as follows:
- This load value BW furthermore serves the comparison unit 5 to make a comparison between the load value BW on the one hand and a predefinable comparison value VG on the other hand, a signal indicating the reaching of the check interval end being output via the display 6 as soon as the resulting load value BW equals the predeterminable comparison value VG is or exceeds this.
- the working pressures p measured by the pressure sensor 2, the loading quantities BG determined by the calculating unit 3, and the loading values BW determined by the calculating unit 3 are stored in a memory unit 4 in the embodiment according to FIG.
- the method described above with reference to FIG. 1 serves, in particular, to precisely determine the test interval end of a test interval PI to be maintained for carrying out a recurrent test of load cycles AZ in work cycles AZ as a function of the working pressures p actually prevailing during the work cycles AZ, so that this is unnecessary Short test intervals PI can be avoided, meaning that recurring tests are not performed more frequently than required.
- a load-loaded pressure vessel 1 for example in the form of an overpressure quenching chamber for metallic workpieces, is designed for a maximum working pressure of 15 bar. This maximum allowable working pressure is called the design pressure.
- the pressure vessel 1 although designed for 15 bar overpressure, operated with a maximum of only 14 bar pressure.
- a pressure vessel 1 with a Design pressure of 15 bar for example, 5,500 load changes at a pressure of 10 bar, 10,000 load changes at a pressure of 8 bar or 110,000 load changes with a pressure of 3 bar.
- the load variable BG per work cycle is determined for each work cycle.
- the load quantities BG of several consecutive work cycles are summed up to give a resulting load value BW.
- the load value BW determined in this way is compared with a predefinable comparison value VG, the test interval end being reached as soon as the resulting load value BW equals or exceeds the predefinable comparison value VG.
- the comparison value VG is determined as a fraction of the number of working cycles theoretically possible at design pressure of the pressure vessel 1, with a fraction of 0.5 being preferred.
- a pressure vessel for example, 6,300 cycles at a pressure of 1, 5 bar, 4,000 cycles at a pressure of 5 bar, 2,000 cycles at a pressure of 9 bar, 250 cycles at a pressure of 12 bar and 50 cycles at a pressure of 14 bar subjected.
- Fig. 2 shows a schematic diagram of a flow chart.
- the times t 0 and t n are plotted on a timeline. At time to, a recurring check takes place, as well as at time t n . Between these two times t 0 and t n is therefore the test interval PI. During the test interval PI, the pressure vessel 1 is subjected to different work cycles.
- a first duty cycle AZi at a working pressure Pi at a second time t 2 a second duty cycle AZ 2 at a working pressure p 2 , at a third time t 3 a third duty cycle AZ 3 at a working pressure pi, at a fourth time U a fourth working cycle AZ 4 at a working pressure p 3 and so on.
- the actual working pressures p prevailing during each work cycle AZ are measured and a load quantity BG is determined per work cycle.
- the individual load quantities BG are added up to a resulting total load value BW.
- this load value exceeds a predefinable comparison value of, for example, 0.5, the end of the check interval has been reached. In the example shown in FIG. 2, this is the case after the last working cycle AZ n -i, which is why a repetitive test must be carried out at the time t n after the end of this working cycle.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07702761A EP1971844A1 (de) | 2006-01-14 | 2007-01-15 | Verfahren zur messtechnischen bestimmung des intervallendes eines prüfintervalls sowie vorrichtung zur durchführung des verfahrens |
US12/087,500 US20090007690A1 (en) | 2006-01-14 | 2007-01-15 | Method for Metrologically Determining the End of a Test Interval, and Device for Carrying Out Said Method |
JP2008549847A JP2009523240A (ja) | 2006-01-14 | 2007-01-15 | 検査間隔の終わりを計量的に決定する方法および装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006001911 | 2006-01-14 | ||
DE102006001911.3 | 2006-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007080128A1 true WO2007080128A1 (de) | 2007-07-19 |
Family
ID=37965032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/000293 WO2007080128A1 (de) | 2006-01-14 | 2007-01-15 | Verfahren zur messtechnischen bestimmung des intervallendes eines prüfintervalls sowie vorrichtung zur durchführung des verfahrens |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090007690A1 (de) |
EP (1) | EP1971844A1 (de) |
JP (1) | JP2009523240A (de) |
CN (1) | CN101371126A (de) |
RU (1) | RU2008132010A (de) |
WO (1) | WO2007080128A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140297006A1 (en) * | 2010-03-12 | 2014-10-02 | Rajendra Padma Sadhu | System and method for providing physiological feedback and rewards for engaging user and retention of customer |
US9235820B2 (en) | 2012-11-01 | 2016-01-12 | Fluor Technologies Corporation | Systems and methods for modifying an operating parameter of a coking system and adding a coke drum |
AT515328A2 (de) * | 2014-02-04 | 2015-08-15 | Bernecker & Rainer Ind Elektronik Gmbh | Verfahren zur Ermittlung von Größen einer Betriebs- oder Maschinendatenerfassung |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60162932A (ja) * | 1984-02-03 | 1985-08-24 | Mitsubishi Heavy Ind Ltd | 繰り返し加圧試験装置 |
SU1613919A1 (ru) * | 1988-12-16 | 1990-12-15 | Специализированное Конструкторско-Технологическое Бюро "Рострубпласт" | Способ испытани образцов полимерных труб внутренним гидростатическим давлением |
RU1796983C (ru) * | 1990-08-06 | 1993-02-23 | Военная академия им.Ф.Э.Дзержинского | Способ оценки усталостной поврежденности конструкции в услови х случайного нагружени |
EP0855684A2 (de) * | 1997-01-23 | 1998-07-29 | MANNESMANN Aktiengesellschaft | Verfahren zur Erfassung des Ist-Zustandes eines Behälters, insbesondere Composite-Druckgasbehälter für Fahrzeuge |
WO2004077026A1 (fr) * | 2003-02-25 | 2004-09-10 | Zao 'koordinacionny Centr Po Nadeznosty, Bezopasnosty I Resursu Oborudovania I Truboprovodam Atomnyh Stancy' | Procede d'epreuves hydrauliques ou pneumatiques de cuves et de pipelines sous pression assurant une fiabilite et une securite de leur exploitation |
UA40469C2 (uk) * | 2001-02-28 | 2004-10-15 | Дочірня Компанія "Укртрансгаз" | Спосіб контролю технічного стану посудин і апаратів сталевих |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4453595A (en) * | 1982-09-07 | 1984-06-12 | Maxwell Laboratories, Inc. | Method of measuring fracture pressure in underground formations |
US5367797A (en) * | 1993-10-25 | 1994-11-29 | Omega Environmental, Inc. | Process for testing a vessel |
US20060195035A1 (en) * | 2005-02-28 | 2006-08-31 | Dehchuan Sun | Non-invasive radial artery blood pressure waveform measuring apparatus system and uses thereof |
US7568507B2 (en) * | 2005-12-06 | 2009-08-04 | Air Products And Chemicals, Inc. | Diagnostic method and apparatus for a pressurized gas supply system |
-
2007
- 2007-01-15 CN CNA2007800030876A patent/CN101371126A/zh active Pending
- 2007-01-15 WO PCT/EP2007/000293 patent/WO2007080128A1/de active Application Filing
- 2007-01-15 RU RU2008132010/28A patent/RU2008132010A/ru unknown
- 2007-01-15 JP JP2008549847A patent/JP2009523240A/ja not_active Withdrawn
- 2007-01-15 EP EP07702761A patent/EP1971844A1/de not_active Withdrawn
- 2007-01-15 US US12/087,500 patent/US20090007690A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60162932A (ja) * | 1984-02-03 | 1985-08-24 | Mitsubishi Heavy Ind Ltd | 繰り返し加圧試験装置 |
SU1613919A1 (ru) * | 1988-12-16 | 1990-12-15 | Специализированное Конструкторско-Технологическое Бюро "Рострубпласт" | Способ испытани образцов полимерных труб внутренним гидростатическим давлением |
RU1796983C (ru) * | 1990-08-06 | 1993-02-23 | Военная академия им.Ф.Э.Дзержинского | Способ оценки усталостной поврежденности конструкции в услови х случайного нагружени |
EP0855684A2 (de) * | 1997-01-23 | 1998-07-29 | MANNESMANN Aktiengesellschaft | Verfahren zur Erfassung des Ist-Zustandes eines Behälters, insbesondere Composite-Druckgasbehälter für Fahrzeuge |
UA40469C2 (uk) * | 2001-02-28 | 2004-10-15 | Дочірня Компанія "Укртрансгаз" | Спосіб контролю технічного стану посудин і апаратів сталевих |
WO2004077026A1 (fr) * | 2003-02-25 | 2004-09-10 | Zao 'koordinacionny Centr Po Nadeznosty, Bezopasnosty I Resursu Oborudovania I Truboprovodam Atomnyh Stancy' | Procede d'epreuves hydrauliques ou pneumatiques de cuves et de pipelines sous pression assurant une fiabilite et une securite de leur exploitation |
Also Published As
Publication number | Publication date |
---|---|
US20090007690A1 (en) | 2009-01-08 |
CN101371126A (zh) | 2009-02-18 |
RU2008132010A (ru) | 2010-02-20 |
JP2009523240A (ja) | 2009-06-18 |
EP1971844A1 (de) | 2008-09-24 |
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