EP1709413A1 - Procede pour tester l'etancheite d'une voie d'alimentation en gaz - Google Patents

Procede pour tester l'etancheite d'une voie d'alimentation en gaz

Info

Publication number
EP1709413A1
EP1709413A1 EP05707025A EP05707025A EP1709413A1 EP 1709413 A1 EP1709413 A1 EP 1709413A1 EP 05707025 A EP05707025 A EP 05707025A EP 05707025 A EP05707025 A EP 05707025A EP 1709413 A1 EP1709413 A1 EP 1709413A1
Authority
EP
European Patent Office
Prior art keywords
gas
supply line
gas supply
test
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05707025A
Other languages
German (de)
English (en)
Inventor
Klaus Bott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Schweiz AG
Original Assignee
Siemens Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Schweiz AG filed Critical Siemens Schweiz AG
Publication of EP1709413A1 publication Critical patent/EP1709413A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01M3/2807—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 pipes
    • G01M3/2815—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 pipes using pressure measurements

Definitions

  • the invention relates to a method for leak testing a gas supply line according to the preamble of
  • Claim 1 and an apparatus for performing the method.
  • a method of the type mentioned at the outset is known, for example, from DE 198 31 067 C2.
  • This document discloses a gas supply line for a burner with two gas valves arranged one behind the other and a pressure switch provided between the gas valves.
  • the gas valves are arranged in series, the gas flowing through the gas section first flowing through the first gas valve and then through the second gas valve.
  • the second gas valve is checked and when the burner is switched off, the tightness of the first gas valve is checked.
  • the first gas valve is first opened for a predetermined period of time and then closed again. Gas flows into the gas supply line within the period in which the first gas valve is open and the second gas valve is closed. The resulting pressure rise is monitored by the pressure switch.
  • the pressure switch detects a drop in pressure below the pressure threshold, the contact of the pressure switch will open, which means that the leakage of the second gas valve can be concluded. However, if the pressure switch does not switch, the tightness of the second gas valve can be concluded.
  • the signal from the pressure switch thus provides information about the tightness of the second gas valve when the burner is started. To check the tightness of the first gas valve, it is closed when the burner is switched off, while the second gas valve remains open for a predetermined period of time. As a result, the gas located between the first and the second gas valve can flow out toward the burner.
  • the gas pressure between the two valves will decrease accordingly, which is detected by the pressure switch by passing the pressure threshold, whereby the contact of the pressure switch opens.
  • the tightness of the first gas valve can be concluded from the signal of the pressure switch.
  • the pressure switch does not switch, this indicates the tightness of the first gas valve.
  • the function of the leak test can also be integrated in an automatic burner, which means that no additional space is required in order to implement the leak test of the gas valves in terms of device technology.
  • EP 0 284 785 A1 also discloses a method for checking the tightness of two valves arranged one behind the other in a gas supply line. After a waiting period from the closing of the valves, it is checked whether the pressure of the gas trapped between the valves in the gas path is above or below a predetermined pressure threshold. This is done, for example, by means of a differential pressure sensor, which works as a pressure switch, the pressure threshold being, for example, half of the inlet pressure. If the pressure detected between the closed valves in the gas path is below the pressure threshold, this means that the first valve is sufficiently tight. The first valve is then opened, as a result of which the gas path between the valves is largely subjected to the inlet pressure of the gas network.
  • the pressure threshold is thus first passed from bottom to top when the first valve is opened.
  • the pressure in the gas path is characteristic of the degree of tightness of the second valve to be checked during the measurement period. If, for example, the measured pressure at the end of the measuring time is below the pressure threshold, the second valve is leaking. This is signaled by passing the pressure threshold from top to bottom within the measuring time. If the pressure does not drop below the pressure threshold within the measurement time after a brief opening, the second valve is rated as sufficiently tight.
  • the value of the set lower and upper pressure threshold thus represents a measure of the tightness of the valve being tested. This makes it easy to implement the evaluation logic.
  • the test severity of the enclosed gas is defined via an adjustable pressure threshold of a pressure switch, the measured gas pressure being monitored by the pressure threshold.
  • this is inaccurate and the measurement cannot be reproduced, which means that it is not possible to determine the signal-to-noise ratio after the measurement.
  • Leak testing also requires several pressure switches based on a pressure threshold for different test levels, which is, however, complex.
  • US 5,827,950 discloses a method for leak testing of valves, in particular of vent valves.
  • a test gas supply line specially provided for the leak test is switched on via a control valve controlled by a computer.
  • that becomes one test gas having a certain pressure is enclosed between the vent valves arranged in a vent line.
  • the gas pressure enclosed in the ventilation line is detected by a pressure sensor arranged between the control valve and the ventilation valves, the pressure detected by the pressure sensor being monitored by the computer during the test period. If pressure changes are found during the test period, the vent valves are rated as leaking. Due to the fact that in US 5,827,950 a special test gas is used for the leak test, which is supplied by means of a separate test gas supply line, the leak test is not versatile.
  • Another problem is that not only the gas valves but also the gas lines can leak.
  • the invention is therefore based on the object of proposing a method for leak testing a gas supply line which, while avoiding the disadvantages of the prior art mentioned, enables the gas supply line to be checked or monitored automatically, the method versatile and should be carried out with little technical effort.
  • the gas located in the gas supply line is shut off from the gas supply network and the gas consumption device (burner) with the aid of two gas valves arranged in series in relation to the direction of flow of the gas in the gas supply line, the accuracy of the test in the Gas supply route of enclosed gas is defined by a test time selected for the leak test and that the pressure measured during the test time, e.g. the differential pressure is evaluated to determine the tightness of the gas supply line.
  • the gas supply line and the gas valves of the gas supply line can be checked or monitored with different test times. For example, the test time for the gas valves in the seconds range and for the gas supply line in
  • the leak test is preferably based on a differential pressure measurement and is carried out, for example, before starting and / or after switching off the gas consumption device.
  • the gas supply line is preferably checked or monitored by a programmable control / testing unit, e.g. an automatic burner control, since it already has a sufficient safety structure that can be used for the leak test.
  • test severity has z. B. with a programmable control / testing unit the advantage that the test severity can be varied as desired by different test times. For example, different test times and thus test levels for the gas valves and gas supply line can be used for the leak test at gas network pressure or atmospheric pressure when using a pressure sensor or pressure switch. An increased level of test accuracy is also possible in the event of service due to a temporary extension of the test time and a simple and exact reset to the standard setting of the leak test.
  • the leak test is preferably controlled by a central control / testing device.
  • the burner controls of the consumption devices then report to it whether there is consumption, e.g. whether a burner is in operation.
  • Communication between the burner controls and the central control / test device can be conventional or via a data bus or wireless.
  • the central control / test device thus knows at what point in time there is consumption.
  • the central control / test device preferably has a safety-related structure, which ensures safe shutdown in the event of an error or a fault.
  • Fig. 1 shows an embodiment of a gas supply line shown as a functional block diagram
  • FIG. 1 shows in a functional block diagram an example of a gas supply line which can be shut off from the network of a gas supplier by a gas valve 1.
  • This gas valve is referred to below as a shut-off valve and is, for. B. arranged at the entrance of the gas supply line of a house installation.
  • the shut-off valve 1 is preferably closed when de-energized so that a safe shutdown by a control / test unit 10 is ensured even in the event of a failure of the electrical supply.
  • the control / testing unit 10 can be part of an automatic burner control, for example. This is advantageous if the latter already has the safety-related structures for monitoring and controlling the valves and sensors.
  • a gas flow sensor 2 is preferably arranged immediately after the shut-off valve 1 in the gas supply line 3, which, in addition to detecting a leak in the unused state, can also detect the regular gas consumption.
  • a gas consumption meter that detects and displays the amount of gas used can also be used. If a consumption is detected by the flow sensor or by the gas consumption counter without the gas consumption device, for example burner 9, being in operation, control / test unit 10 switches off shutoff valve 1 on the network side and / or valves 6 and 8 on the burner side.
  • each valve is assigned a drive for opening or closing the respective valve.
  • the valve 6 is called a safety valve and the valve 8 connected in series with it is called a fuel valve. Due to the redundant design of the valves 6 and 8 connected in series, the gas supply to the burner 9 can be prevented by the safety valve 6 in the event of a defective fuel valve 8.
  • the safety valve 6 is not absolutely necessary, since if the fuel valve 8 is defective, the gas supply can also be prevented by the shut-off valve 1 on the network side. In particular, if the shut-off valve has a higher safety class than the safety valve, this can be dispensed with.
  • a gas leak in the gas supply line can be detected at any time of operation of the burner.
  • the gas detection sensor 4 thus enables permanent monitoring of the gas supply line, it being possible for the burner to be switched off safely and locked when escaping gas is detected.
  • a gas pressure sensor 5 can be connected to the gas supply line.
  • the gas pressure sensor 5 can e.g. B. monitor the gas network pressure. In this way, for example, a time-limited shutdown of the gas supply network can be recognized.
  • the gas pressure sensor 5 can be designed, for example, as an analog / digital pressure meter or as a pressure switch.
  • the leak test of the gas supply line can also be carried out with the help of the gas pressure sensor 5.
  • the safety valve or the fuel valve with the gas supply line can be included alternately.
  • the leak test of the safety and fuel valve can also be carried out independently of the leak test of the gas supply line.
  • a further pressure sensor 7 is provided between them for checking the valves, which can be designed like the pressure sensor 5.
  • FIG. 2 shows, by way of example in a flowchart, the method according to the invention for checking the tightness of a gas supply line.
  • the individual function blocks or process steps are described below.
  • the gas consumption device for. B. the burner is shown in normal operation.
  • the gas network pressure can be monitored by a gas pressure sensor during normal burner operation.
  • this monitoring is not absolutely necessary if it is ensured that there is sufficient gas network pressure.
  • One or more gas detection sensors arranged along the gas supply line can detect a gas leak at any time of operation of the burner. This permanent gas detection monitoring is represented by the function block 30.
  • the burner is switched off safely and the mains-side shut-off valve and the burner-side valves are closed.
  • the safety shutdown is shown in function block 40. Permanent gas detection monitoring is optional. This also applies to the gas consumption monitoring shown in function block 50.
  • the gas consumption check can be carried out after a safety or control shutdown of the burner. If a gas consumption is detected by the gas flow sensor without the burner being in operation, z. B. the control / test unit of the burner control unit, that the mains shut-off valve is switched off and this is reported as a fault.
  • the fail-safe of the flow sensor can be tested cyclically before the burner is started or after the burner is switched off.
  • the flow sensor can be checked, for example, by a temporal coupling between the open gas valves of the consumption device and a gas consumption detection.
  • the function of the shut-off valve can also be checked, as shown in function block 70. If a gas flow is detected by the flow sensor despite the shut-off valve being switched off, this is reported as a fault.
  • the pressure measurement can then be carried out in the gas supply line.
  • the pressure measurement can be carried out with the help of two pressure sensors or just with one pressure sensor. In both cases, the pressure measurement can be carried out before starting or after the burner has been switched off or at cyclical intervals or permanently
  • Standby operation of the gas consumption device can be carried out. It can first be determined whether there is sufficient gas pressure in the gas supply line.
  • Function block 80 includes the leak test of the safety valve and fuel valve, the test severity of the gas enclosed between the valves being defined by a test time defined by the programmable control / test unit. If the leak test of the valves has been successfully carried out, the leak test of the gas supply line can then be carried out, as shown in block 90. It can first be determined whether there is sufficient gas pressure in the gas supply line. Depending on this, the desired test severity can then be determined by setting the test time for the leak test.
  • the shutoff valve on the network side is then switched off or closed, and that between the shutoff valve and the safety valve or when the safety valve is open or does not exist, the gas enclosed between the shut-off valve and the fuel valve in the gas supply line is monitored by a pressure measurement to determine whether a pressure change occurs within the test time.
  • the magnitude of the pressure change can be compared to a reference value, which is a measure of the tightness of the gas supply line. Is during the test period, e.g. B. no pressure drop is detected, the burner can be put into operation at the next start. However, if a pressure drop is detected, the control / test unit can prevent the burner from being started up by locking. This can be indicated to the condition staff as a malfunction. Appropriate measures can then be taken to remedy the fault, for example sealing the gas supply line or replacing the valves.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un procédé servant à tester l'étanchéité d'une voie d'alimentation en gaz présentant une conduite d'alimentation en gaz pour un brûleur. En cas d'arrêt du brûleur, le gaz s'écoulant à travers la conduite d'alimentation en gaz est automatiquement coupé du brûleur au moyen d'une première soupape placée dans la conduite d'alimentation en gaz. Au moins une autre soupape de gaz, montée en série par rapport à la première soupape, est placée dans la conduite d'alimentation en gaz et est mise hors circuit pour le test d'étanchéité, ce qui enferme le gaz se trouvant dans la conduite d'alimentation en gaz. Le procédé selon l'invention est caractérisé en ce que la précision de test pour le gaz enfermé dans la conduite d'alimentation en gaz est définie par une durée de test sélectionnée pour le test d'étanchéité et en ce que la pression mesurée dans la conduite d'alimentation en gaz pendant la durée de test est évaluée pour déterminer l'étanchéité de la voie d'alimentation en gaz.
EP05707025A 2004-01-30 2005-01-27 Procede pour tester l'etancheite d'une voie d'alimentation en gaz Withdrawn EP1709413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410005027 DE102004005027A1 (de) 2004-01-30 2004-01-30 Verfahren zur Dichtheitsprüfung einer Gasversorgungsstrecke
PCT/EP2005/000775 WO2005073687A1 (fr) 2004-01-30 2005-01-27 Procede pour tester l'etancheite d'une voie d'alimentation en gaz

Publications (1)

Publication Number Publication Date
EP1709413A1 true EP1709413A1 (fr) 2006-10-11

Family

ID=34801410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707025A Withdrawn EP1709413A1 (fr) 2004-01-30 2005-01-27 Procede pour tester l'etancheite d'une voie d'alimentation en gaz

Country Status (3)

Country Link
EP (1) EP1709413A1 (fr)
DE (1) DE102004005027A1 (fr)
WO (1) WO2005073687A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698372A (zh) * 2013-12-04 2015-06-10 上海乐研电气科技有限公司 一种含有六氟化硫或混合气体的密度继电器校验装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005048456A1 (de) * 2005-10-07 2007-04-12 Robert Bosch Gmbh Verfahren zur Diagnose eines Absperrventils
DE102007015783A1 (de) * 2007-03-30 2008-10-02 Robert Bosch Gmbh Verfahren zur Diagnose eines Absperrventils
EP2131172B1 (fr) 2008-06-03 2012-05-16 Truma Gerätetechnik GmbH & Co. KG Dispositif de commande de gaz à l'aide d'un contrôle d'étanchéité
DE102011114855A1 (de) 2011-10-04 2013-04-04 Saacke Gmbh Vorrichtung und Verfahren zur Dichtheitskontrolle von Sicherheitsabsperrventilen einer Flüssigbrennstoff-Feuerungsanlage
HUE046662T2 (hu) 2014-09-10 2020-03-30 Siemens Ag Szelep mûködtetés és diagnosztika
CN114264424B (zh) * 2021-11-15 2024-07-19 江苏永鼎股份有限公司 一种预制棒烧结炉密封性测试工装及测试方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698372A (zh) * 2013-12-04 2015-06-10 上海乐研电气科技有限公司 一种含有六氟化硫或混合气体的密度继电器校验装置

Also Published As

Publication number Publication date
DE102004005027A1 (de) 2005-08-18
WO2005073687A1 (fr) 2005-08-11

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