DE102008033628A1 - Condition monitoring method for automatic and continuous leak test of welded tubular steel foundation construction, involves filling steel tube construction with gas or gas mixture at pressure above ambient pressure at base of foundations - Google Patents
Condition monitoring method for automatic and continuous leak test of welded tubular steel foundation construction, involves filling steel tube construction with gas or gas mixture at pressure above ambient pressure at base of foundations Download PDFInfo
- Publication number
- DE102008033628A1 DE102008033628A1 DE200810033628 DE102008033628A DE102008033628A1 DE 102008033628 A1 DE102008033628 A1 DE 102008033628A1 DE 200810033628 DE200810033628 DE 200810033628 DE 102008033628 A DE102008033628 A DE 102008033628A DE 102008033628 A1 DE102008033628 A1 DE 102008033628A1
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- gas
- pressure
- condition monitoring
- tubular steel
- automatic
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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
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2884—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for welds
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
Fundamente von Offshore-Anlagen aus geschweißten Stahlkonstruktionen, beispielsweise Anlagen der Öl- und Gasindustrie sowie Windkraftanlagen oder Forschungsstationen, müssen in turnusmäßigen Abständen auf strukturschwächende Brüche, Lochfraß oder Haarrisse untersucht werden. Derartige Untersuchungen werden üblicherweise von Tauchern durchgeführt.foundations offshore installations of welded steel structures, for example Installations of oil and gas industry as well as wind turbines or research stations, have to at regular intervals strukturschwächende Fractures, pitting or hairline cracks to be examined. Such studies are usually performed by divers.
Die Untersuchungen sind aus folgenden Gründen sehr aufwändig:
- 1. Taucherarbeiten können aufgrund starker Strömungen nur ca. 2–3 Stunden bei Stillwasser zwischen den Tiden stattfinden, was in der Regel den Einsatz mehrerer Taucher erfordert.
- 2. Kleine Wetterfenster erhöhen die Standby-Kosten.
- 3. Das Arbeitsschiff muss in unmittelbarer Nähe des Fundamentes mit wenigstens drei Zurrankern zeitaufwändig verankert und gesichert werden.
- 4. Der Bewuchs durch Seepocken oder andere Hartsubstratbesiedler muss sorgfältig und zeitaufwändig entfernt werden.
- 5. Die Kosten steigen exponentiell mit der Wassertiefe.
- 1. Diving work can take place due to strong currents only about 2-3 hours in still water between the tides, which usually requires the use of multiple divers.
- 2. Small weather windows increase the standby costs.
- 3. The working vessel must be anchored and secured in the immediate vicinity of the foundation with at least three restraints.
- 4. The growth by barnacles or other Hartsubstratbesiedler must be carefully and time consuming removed.
- 5. The costs increase exponentially with the water depth.
Ein weiterer Nachteil besteht darin, dass Beschädigungen, die innerhalb der etwa alle 2–3 Jahre erforderlichen turnusmäßigen Untersuchungen stattfinden, nicht erkannt werden und zum Totalverlust der Anlage führen können. Bei einem weitgehenden oder völligem Verzicht auf Tauchereinsätze würden die Versicherungskosten sinkenOne Another disadvantage is that damage occurring within the about every 2-3 Years required regular examinations take place, are not recognized and the total loss of the plant to lead can. In a substantial or complete Waiver of diving operations would the insurance costs decrease
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, das eine automatische und kontinuierliche Überwachung der geschweißten Stahlrohre, insbesondere der Schweißnähte, auf Brüche, Lochfraß oder Haarrisse ermöglicht.Of the Invention has for its object to provide a method automatic and continuous monitoring of welded steel tubes, especially welds, fractures, pitting or hairline cracks allows.
Erfindungsgemäß wird diese Aufgabe gelöst durch Befüllen der Stahlrohrkonstruktion mit einem Gas- oder Gasgemisch auf einen Druck, der erheblich über dem Umgebungsdruck am Fuß der Fundamente liegt, Erfassen des Gasdrucks, Auswerten des Druckverlaufs des Gases und Ausgeben einer Warnmeldung bei einem schleichenden- oder signifikanten Druckabfall, der nicht auf einem Umgebungstemperaturabfall beruht.According to the invention this Task solved by fill the steel tube construction with a gas or gas mixture on one Pressure that is considerably over the ambient pressure at the foot of the Foundations lies, detecting the gas pressure, evaluating the pressure curve of the gas and emitting a warning message on a creeping or significant pressure drop that is not due to an ambient temperature drop based.
Das Befüllen der Stahlrohrkonstruktion mit einem Druckgas, erfolgt auf einen Druck, der erheblich höher ist als der Umgebungsdruck in Höhe des Fundamentfusses am Meeresboden, der z. B. bei 20 m Wassertiefe 3 bar und in 30 m Wassertiefe 4 bar beträgt.The fill The steel tube construction with a compressed gas, takes place on a Pressure, which is considerably higher is higher than the ambient pressure the foot of the foundation on the seabed, the z. B. at 20 m water depth 3 bar and in 30 m water depth is 4 bar.
Die Erfindung nutzt damit den Umstand, dass ein in die Hohlräume der geschweißten Stahlrohre eingebrachtes, unter Überdruck stehendes Gas oder Gasgemisch durch die Fehlstellen austreten wird, was einen Abfall des Drucks, unter dem das Gas steht, zur Folge haben wird und somit durch Beobachten des Gasdrucks eine Aussage über das Vorhandensein von Fehlstellen ermöglicht wird.The Invention thus exploits the fact that one in the cavities of the welded Steel tubes introduced, under pressure Stagnant gas or gas mixture will escape through the defects, which results in a drop in the pressure under which the gas stands and thus by observing the gas pressure a statement about the Presence of defects is enabled.
Das Befüllen der Stahlkonstruktion erfolgt mittels eines – vorzugsweise elektrisch betriebenen – Verdichters, der umgekehrt auch als Notstromaggregat genutzt werden kann.The fill the steel construction takes place by means of a - preferably electrically operated - compressor, the reverse can also be used as an emergency generator.
Das Erfassen des Drucks erfolgt mittels eines oder mehrerer Drucksensoren und das Auswerten des Druckverlaufs innerhalb eines entsprechenden Toleranzbandes mittels eines eigenen Fundament Condition Monitoring Systems oder über ein vorhandenes Condition Monitoring System der betreffenden Offshore-Anlage. Bei einem schleichenden oder signifikanten Druckabfall wird ein solches System eine Warnmeldung abgeben.The Detecting the pressure by means of one or more pressure sensors and evaluating the pressure profile within a corresponding one Tolerance band by means of its own foundation condition monitoring Systems or over an existing condition monitoring system of the relevant offshore facility. At a creeping or significant pressure drop becomes such system will issue a warning message.
Bei dem Auswerten des Druckverlaufs wird der Umstand zu berücksichtigen sein, dass sich der Gasdruck auch bei bloßen Temperaturschwankungen z. B. durch Sonneneinstrahlung, Wind- oder wechselnden Wasserstände ändert, ohne dass eine Fehlstelle vorliegt, wobei nur der sinkende Gasdruck von Bedeutung ist.at The circumstance must be taken into account when evaluating the pressure curve be that the gas pressure even with mere temperature fluctuations z. B. by sunlight, wind or changing water levels, without that there is a defect, with only the decreasing gas pressure of Meaning is.
Hier kann man mit wenigstens einem Innen- und einem Aussentemperatursensor die Auswertung verbessern und die Interpretation eines Druckabfalls z. B. über einer Tages- und/oder einer Jahrestemperaturganglinie erleichtern.Here you can with at least one indoor and one outside temperature sensor improve the evaluation and the interpretation of a pressure drop z. B. over a daytime and / or facilitate a year temperature gradient.
Das in die Stahlrohrkonstruktion einzubringende Gas kann Umgebungsluft sein, aus der zur Korrosionsverhinderung vor dem Verdichten Salz und Feuchtigkeit abgetrennt wird. Weiter kann ihr Sauerstoff entzogen werden, so dass das eingebrachte Gasgemisch im wesentlichen aus Distickstoff (N2) besteht, der aufgrund seiner flammhemmenden Eigenschaften, z. B. in Offshore Windkraftanlagen, über ein entsprechend ausgelegtes, verriegelbares Sicherheitsventil auch zur automatischen Brandlöschung genutzt werden kann, sofern sich, wegen der erstickenden Eigenschaften von Distickstoff, keine Wartungsmannschaft in der Anlage befindet.The gas to be introduced into the tubular steel structure may be ambient air from which salt and moisture are separated for corrosion prevention prior to compaction. Further, their oxygen can be removed, so that the introduced gas mixture consists essentially of dinitrogen (N 2 ), which due to its flame retardant properties, eg. B. in offshore wind turbines, via a suitably designed, lockable safety valve can also be used for automatic fire extinguishing, provided that, due to the suffocating properties of dinitrogen, no maintenance team is in the system.
Das in die Stahlrohrkonstruktion einzubringende Gas kann auch ein über Gasflaschen angeliefertes technisches Gas, wie z. B. Distickstoff (N2) oder Kohlenstoffdioxid (CO2) sein, so dass auf eine bordeigene Verdichteranlage verzichtet werden kann. Kohlenstoffdioxid kann ebenfalls zur automatischen Brandbekämpfung eingesetzt werden, weil es Sauerstoff verdrängt. Andere technische Gase oder Gasgemische sollten, ebenso wie Distickstoff oder Kohlenstoffdioxid nicht korrosionsfördernd, vorzugsweise sogar korrosionshemmend sein und keinesfalls explosive Eigenschaften haben.The gas to be introduced into the tubular steel structure can also be a technical gas supplied via gas cylinders, such as e.g. B. dinitrogen (N 2 ) or carbon dioxide (CO 2 ), so that can be dispensed with an onboard compressor system. Carbon dioxide can also be used for automatic fire fighting because it displaces oxygen. Other technical gases or gas mixtures should, as well as dinitrogen or Carbon dioxide not corrosive, preferably even corrosion inhibiting and in no case have explosive properties.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE200810033628 DE102008033628B4 (en) | 2008-07-17 | 2008-07-17 | Method for operating offshore installations with welded tubular steel foundation construction and possible sources of fire |
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DE200810033628 DE102008033628B4 (en) | 2008-07-17 | 2008-07-17 | Method for operating offshore installations with welded tubular steel foundation construction and possible sources of fire |
Publications (2)
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DE102008033628A1 true DE102008033628A1 (en) | 2010-01-21 |
DE102008033628B4 DE102008033628B4 (en) | 2011-02-24 |
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DE200810033628 Expired - Fee Related DE102008033628B4 (en) | 2008-07-17 | 2008-07-17 | Method for operating offshore installations with welded tubular steel foundation construction and possible sources of fire |
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CN104820410A (en) * | 2015-03-20 | 2015-08-05 | 苏州首旗信息科技有限公司 | Gas station real-time monitoring device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4104906A (en) * | 1977-04-04 | 1978-08-08 | Continental Oil Company | Early crack detection with multi-pressure system |
US4143540A (en) * | 1977-12-27 | 1979-03-13 | Continental Oil Company | Method of preventing corrosion of joints of steel structures submerged in corrosive media |
US4425054A (en) * | 1980-12-04 | 1984-01-10 | Compagnie Francaise Des Petroles | Marine platform adapted to facilitate the detection of possible cracks |
US4502041A (en) * | 1982-05-03 | 1985-02-26 | The Regents Of The University Of California | Structure failure detector with signal transmission through the structure itself |
WO2002018898A1 (en) * | 2000-08-30 | 2002-03-07 | Ronald Frederick Geary | Liquid ingress detection |
DE10345250A1 (en) * | 2003-09-29 | 2005-04-21 | Linde Ag | Fire extinguishing method for wind-powered energy plant with hollow turbine tower used for storage and/or supply of fire extinguishing medium |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771604A (en) * | 1972-04-06 | 1973-11-13 | R Barron | Fire damage protected offshore oil producing rig |
GB2179977B (en) * | 1985-09-04 | 1989-08-23 | Shell Int Research | Fire resistant structure |
-
2008
- 2008-07-17 DE DE200810033628 patent/DE102008033628B4/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4104906A (en) * | 1977-04-04 | 1978-08-08 | Continental Oil Company | Early crack detection with multi-pressure system |
US4143540A (en) * | 1977-12-27 | 1979-03-13 | Continental Oil Company | Method of preventing corrosion of joints of steel structures submerged in corrosive media |
US4425054A (en) * | 1980-12-04 | 1984-01-10 | Compagnie Francaise Des Petroles | Marine platform adapted to facilitate the detection of possible cracks |
US4502041A (en) * | 1982-05-03 | 1985-02-26 | The Regents Of The University Of California | Structure failure detector with signal transmission through the structure itself |
WO2002018898A1 (en) * | 2000-08-30 | 2002-03-07 | Ronald Frederick Geary | Liquid ingress detection |
DE10345250A1 (en) * | 2003-09-29 | 2005-04-21 | Linde Ag | Fire extinguishing method for wind-powered energy plant with hollow turbine tower used for storage and/or supply of fire extinguishing medium |
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DE102008033628B4 (en) | 2011-02-24 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
R020 | Patent grant now final |
Effective date: 20110619 |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20120201 |