EP1089032A2 - Procédé et dispositif pour éviter la contamination d'une canalisation d'un réseau véhiculant un gaz - Google Patents
Procédé et dispositif pour éviter la contamination d'une canalisation d'un réseau véhiculant un gaz Download PDFInfo
- Publication number
- EP1089032A2 EP1089032A2 EP00203221A EP00203221A EP1089032A2 EP 1089032 A2 EP1089032 A2 EP 1089032A2 EP 00203221 A EP00203221 A EP 00203221A EP 00203221 A EP00203221 A EP 00203221A EP 1089032 A2 EP1089032 A2 EP 1089032A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- gas
- pressure value
- vpo
- prefixed
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011109 contamination Methods 0.000 title claims description 6
- 239000007789 gas Substances 0.000 claims description 64
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 230000003797 telogen phase Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003612 virological effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
Definitions
- the present invention relates to a method and an installation to avoid or minimize the entry of gaseous impurities present in ambient air, in particular water vapor, hydrocarbons or the like, inside a gas pipe or a network of gas pipelines, when the pipeline or pipeline system is in the stop or rest phase, i.e. when the gas is not consumed by one or more user sites located downstream of the pipeline, for example during nights or weekends (weekends).
- industrial gases are stored, on site, in the form carbonated or in liquefied form in storage containers, such as pressure cylinders, tanks, capacities or the like; source of gas being connected to one or more user sites consuming said gas, via one or more gas pipes carrying said gas.
- the gas can be transported to the various sites users either via a single pipe, possibly branched, or via several pipes forming a network.
- the taps which can remain open, the pipes being able to present a lack of tightness at unscrewed or improperly screwed fittings, the hoses connected to pipes presenting phenomena of aging thus becoming permeable to some extent to some molecules, damaged hoses ...
- the pollutants are, in particular, O 2 , N 2 , H 2 0, but also the hydrocarbons , airborne paints ...
- the present invention aims to solve the above problems presentations on the harmful entry of atmospheric compounds undesirable in gas pipes, during (stopping or rest, during which user sites do not consume or only small amounts of gas.
- the means for determining the pressure are chosen among the pressure sensors and / or in that the means for adjusting pressure include a valve, preferably a solenoid valve.
- control means comprise a unit of type programmable logic controller.
- the attached figure represents an installation according to the invention, given by way of illustration, but not limitation.
- the installation comprises, in pipe head, a device that keeps the pipe in place main 1 always under a low overpressure between 0.3 and 0.5 bar, when the gas user site 4 does not consume gas (for example the night or weekends).
- This main pipe 1 is supplied with gas from the source of gas 14, for example argon, CO2, nitrogen or oxygen, and routes this gas to user site 4; the gas being, at the outlet of a cold evaporator (not shown), at an outlet pressure (Pef).
- gas for example argon, CO2, nitrogen or oxygen
- Pef outlet pressure
- the adjustment of the working pressure (Pl) of the gas which circulates there is made thanks to the regulator 3; usually the working pressure (Pl) is between 2 and 15 bar.
- the solenoid valve 7 is closed by actuation of a means of remote control 16, such as a switch.
- the installation also includes a 1 'bypass line within which reigns a maintenance pressure (Pbp) whose level is adjusted to means of the regulator 11, for example at a pressure (Pbp) of between 0.3 working bar and pressure (Pl).
- Pbp maintenance pressure
- Pbp is between 0.3 and 0.6 bar.
- the Pbp rule depends on the type of user site 4, i.e. the type of downstream application using gas.
- the gas travels from the source 14 to user 4, via main line 1.
- line 1 is closed by valve 7 and, in the event of loss of gas, i.e. if the pressure (Pl) becomes lower than the maintenance pressure (Pbp) then a flow of gas passes in the bypass line 1 ', so as to maintain line 1 pressure and thus avoid entry of atmospheric impurities in the pipeline circuit.
- Pl pressure
- Pbp maintenance pressure
- the valve 12 makes it possible to guarantee, in line 1 ′, a flow of adjustable maintenance, for example from 3 to 30 l / min.
- a pressure sensor 6 fitted on the main line 1 detects this sudden drop in pressure, (for example if Pbp ⁇ 0.2 bar) and then triggering an alarm, such as a light signal 17 on a control cabinet 18.
- the operator immediately knows that the entry of impurities gas in line 1 were important and it is therefore desirable to purge before starting to work, i.e. use gas, because it may be unclean.
- a pressure sensor can be used to permanently monitor the pressure and to control a solenoid valve flow rate of the gas used, when the pressure drops below a preset threshold.
- a flow control valve for example a tap micrometric, allows to adjust a controlled leak rate if the sensor detects a pressure drop in the network. This leak rate is adjustable in depending on the process used.
- the leak is signaled either by a control box 17 by a light signal which can be brought to a certain place, either by a signal transmitted by remote monitoring to an entity ensuring the control and / or supervision of the installation in order to bring the installation back into conformity.
- the system can be controlled by a PLC (Controller Programmable Logic) which, depending on the input data, for example the pressure or the rate of decrease in pressure in the pipeline, goes adjust the opening or closing, and / or adjust the valves proportional flow control.
- PLC Controller Programmable Logic
- These signals, controlled by PLC, are also used by the remote monitoring system.
- the system can also include a flowmeter / regulator massive flow with electronic control unit to perform the functions mentioned above for the PLC.
- This solution has the advantage of securing the entire installation and avoid the use of leak detectors on multiple gas outlets present in the workshop, poorly suited for remote monitoring.
- the installation and the method according to the invention can be applied to various purposes, in particular for welding aluminum or steel.
- Maintaining the gas pipeline for example conveying argon or a mixture of argon under pressure, ensuring a slight flow of leakage between 6 and 30 l / min, welding can be started, without purging the high-flow pipeline, even after a long interruption, such as a weekend, and also avoids the safety problem linked to under-oxygenation possible working atmosphere.
- the welds carried out from the start have the required quality if the customer has taken the necessary precautions of practice concerning the whole process: steaming of the wire, pickling of sheets just before use ...
- a leakage flow maintains the quality of the welding gas, while avoiding an expensive repair of the network which can reach 1 to 2 km at total.
- the interest of the invention is even greater on the shipyards where the network of gas pipelines often reaches a several kilometers in length or in the food industry where pipeline networks must comply with standards at all times very strict hygienic; any entry of air or impurities which may lead to formation of bacteria nests.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Pipeline Systems (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Abstract
Description
- pour obtenir un joint de soudure exempt de nitrurations ou d'oxydations dans le cas d'un procédé de soudage,
- pour éviter des problèmes de contamination, notamment bactérienne ou virale, lorsque le gaz est mis en oeuvre dans le domaine alimentaire ou médical,
- pour pouvoir être utilisé à des fins d'analyses fines, notamment dans les laboratoires de recherche,
- pour permettre son utilisation en tant qu'atmosphère de refroidissement de circuits comprimés, dans le domaine électronique ...
- il comporte, en outre, une étape de comparaison de la valeur de pression (Vpd) déterminée à l'étape (a) avec au moins la valeur de pression minimale (Vpo) préfixée.
- il comporte, en outre, une étape de comparaison de la valeur de pression (Vpd) déterminée à l'étape (a) avec au moins la valeur de pression maximale (Vpm) préfixée.
- la valeur de pression minimale (Vpo) est inférieure ou égale à 1,5.105 Pa et la valeur de pression maximale (Vpm) est supérieure ou égale à 1,5.105 Pa et inférieure à 3.105 Pa.
- la plage de valeurs de pressions minimale (Vpo) et maximale (Vpm) est d'environ 1,1.105 Pa à environ 1,8.105 Pa, de préférence de 1,3.105 Pa à environ 1,5.105 Pa.
- le gaz est choisi parmi l'argon, l'hélium ou leurs mélanges.
- on maintient, en outre, un débit de fuite compris entre 3 et 30 l.min-1. L'installation susceptible de mettre en oeuvre ce procédé comporte :
- au moins une canalisation de gaz permettant de véhiculer un gaz entre au moins une source de gaz et au moins un site utilisateur,
- des moyens de détermination de la pression régnant à l'intérieur d'au moins une portion de ladite canalisation, pendant ladite période de temps,
- des moyens de pilotage reliés auxdits moyens de détermination de la pression permettant de comparer la valeur de pression mesurée à une valeur de pression minimale (Vpo) préfixée supérieure à 105 Pa et une valeur de pression maximale (Vpm) préfixée supérieure à la valeur de pression minimale (Vpo),
- des moyens d'ajustage de pression permettant d'ajuster ou de maintenir la pression régnant dans au moins ladite portion de canalisation entre lesdites valeur de pression minimale (Vpo) et valeur de pression maximale (Vpm) préfixées, en agissant en réponse auxdits moyens de pilotage de manière à introduire une quantité contrôlée de gaz sous pression dans au moins ladite portion de canalisation.
Claims (10)
- Procédé pour éviter ou minimiser une contamination par une ou plusieurs impuretés gazeuses susceptibles d'être présentes dans l'atmosphère ambiante, pendant au moins une période de temps durant laquelle un site utilisateur ne consomme pas ledit gaz, d'au moins une portion d'au moins une canalisation de gaz susceptible de véhiculer ledit gaz entre au moins une source de gaz et ledit site utilisateur utilisant ledit gaz, dans lequel :(a) on détermine, pendant ladite période de temps, une valeur de pression (Vpd) correspondant à la pression à l'intérieur d'au moins une portion de ladite canalisation, et(b) on ajuste la pression régnant dans au moins ladite portion de canalisation pour maintenir ladite pression entre une valeur de pression minimale (Vpo) préfixée supérieure à 105 Pa et une valeur de pression maximale (Vpm) préfixée supérieure à la valeur de pression minimale (Vpo), le maintien ou l'ajustage de pression étant réalisé par introduction de gaz sous pression dans au moins ladite portion de canalisation.
- Procédé selon la revendication 1, caractérisé en ce qu'il comporte, en outre, une étape de comparaison de la valeur de pression (Vpd) déterminée à l'étape (a) avec au moins la valeur de pression minimale (Vpo) préfixée.
- Procédé selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comporte, en outre, une étape de comparaison de la valeur de pression (Vpd) déterminée à l'étape (a) avec au moins la valeur de pression maximale (Vpm) préfixée.
- Procédé selon l'une des revendications 1 à 3, caractérisé en que la valeur de pression minimale (Vpo) est inférieure ou égale à 1,5.105 Pa et en ce que la valeur de pression maximale (Vpm) est supérieure ou égale à 1,5.105 Pa et inférieure à 3.105 Pa.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la plage de valeurs de pressions minimale (Vpo) et maximale (Vpm) est d'environ 1,1.105 Pa à environ 1,8.105 Pa, de préférence de 1,3.105 Pa à environ 1,5.105 Pa.
- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le gaz est choisi parmi l'argon, l'hélium ou leurs mélanges.
- Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'on maintient, en outre, un débit de fuite compris entre 3 et 30 l/min.
- Installation susceptible de mettre en oeuvre un procédé selon l'une des revendications 1 à 7, caractérisée en ce qu'elle comporte :au moins une canalisation de gaz permettant de véhiculer un gaz entre au moins une source de gaz et au moins un site utilisateur,des moyens de détermination de la pression régnant à l'intérieur d'au moins une portion de ladite canalisation, pendant ladite période de temps,des moyens de pilotage reliés auxdits moyens de détermination de la pression permettant de comparer la valeur de pression mesurée à une valeur de pression minimale (Vpo) préfixée supérieure à 105 Pa et une valeur de pression maximale (Vpm) préfixée supérieure à la valeur de pression minimale (Vpo),des moyens d'ajustage de pression permettant d'ajuster ou de maintenir la pression régnant dans au moins ladite portion de canalisation entre lesdites valeur de pression minimale (Vpo) et valeur de pression maximale (Vpm) préfixées, en agissant en réponse auxdits moyens de pilotage de manière à introduire une quantité contrôlée de gaz sous pression dans au moins ladite portion de canalisation.
- Installation selon la revendication 8, caractérisée en ce que les moyens de détermination de la pression sont choisis parmi les capteurs de pression et/ou en ce que les moyens d'ajustage de pression comprennent une vannes, de préférence une électrovanne.
- Installation selon l'une des revendications 8 ou 9, caractérisée en ce que les moyens de pilotage comprennent une unité de type contrôleur logique programmable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI991966 | 1999-09-22 | ||
| IT1999MI001966A IT1313369B1 (it) | 1999-09-22 | 1999-09-22 | Procedimento e dispositivo per evitare la contaminazione di unacanalizzazione o di un reticolo che veicola un gas. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1089032A2 true EP1089032A2 (fr) | 2001-04-04 |
| EP1089032A3 EP1089032A3 (fr) | 2002-09-11 |
| EP1089032B1 EP1089032B1 (fr) | 2005-02-23 |
Family
ID=11383637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00203221A Revoked EP1089032B1 (fr) | 1999-09-22 | 2000-09-15 | Procédé et dispositif pour éviter la contamination d'une canalisation d'un réseau véhiculant un gaz |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1089032B1 (fr) |
| DE (1) | DE60018242T2 (fr) |
| ES (1) | ES2238024T3 (fr) |
| IT (1) | IT1313369B1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3091970A1 (fr) * | 2019-01-25 | 2020-07-31 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de fertilisation carbonique pour serre |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0232508B2 (ja) * | 1984-07-19 | 1990-07-20 | Katsura Seiki Mfg | Gasushadanbennojidofutsukihoho |
| DE3907209C1 (de) * | 1989-01-18 | 1990-03-01 | Danfoss A/S, Nordborg | Vorrichtung zum Überwachen eines Leitungssystems für Fluid auf Leckstellen |
| SE468775B (sv) * | 1991-11-15 | 1993-03-15 | Ventilatorverken Ab | Ventilationsfoerfarande foer taelt eller liknande, t ex mobila sjukvaardsenheter, samt medel haerfoer |
| US5225167A (en) * | 1991-12-30 | 1993-07-06 | Clestra Cleanroom Technology, Inc. | Room air sterilizer |
| DE19523713C2 (de) * | 1995-06-22 | 1997-04-24 | Mannesmann Ag | Verfahren und Vorrichtung zur Sicherung der Funktionstüchtigkeit von Gasdichtungen bei Turboverdichtern |
| JP3105433B2 (ja) * | 1995-10-17 | 2000-10-30 | 松下電器産業株式会社 | 配管漏洩検知装置 |
-
1999
- 1999-09-22 IT IT1999MI001966A patent/IT1313369B1/it active
-
2000
- 2000-09-15 EP EP00203221A patent/EP1089032B1/fr not_active Revoked
- 2000-09-15 DE DE60018242T patent/DE60018242T2/de not_active Expired - Fee Related
- 2000-09-15 ES ES00203221T patent/ES2238024T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| None |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3091970A1 (fr) * | 2019-01-25 | 2020-07-31 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de fertilisation carbonique pour serre |
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI991966A1 (it) | 2001-03-22 |
| ITMI991966A0 (it) | 1999-09-22 |
| DE60018242D1 (de) | 2005-03-31 |
| EP1089032B1 (fr) | 2005-02-23 |
| EP1089032A3 (fr) | 2002-09-11 |
| IT1313369B1 (it) | 2002-07-23 |
| ES2238024T3 (es) | 2005-08-16 |
| DE60018242T2 (de) | 2006-01-12 |
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