FR2839493A1 - Control method for dangerous waste tank operating under vacuum involves measuring the explosive vapor concentration and comparing it to a safe value to calculate safe operation of pumping circuit - Google Patents
Control method for dangerous waste tank operating under vacuum involves measuring the explosive vapor concentration and comparing it to a safe value to calculate safe operation of pumping circuit Download PDFInfo
- Publication number
- FR2839493A1 FR2839493A1 FR0205790A FR0205790A FR2839493A1 FR 2839493 A1 FR2839493 A1 FR 2839493A1 FR 0205790 A FR0205790 A FR 0205790A FR 0205790 A FR0205790 A FR 0205790A FR 2839493 A1 FR2839493 A1 FR 2839493A1
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- France
- Prior art keywords
- tank
- concentration
- lel
- pumping circuit
- vice
- 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
- 238000005086 pumping Methods 0.000 title claims abstract description 23
- 239000002699 waste material Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002360 explosive Substances 0.000 title claims description 17
- 239000007789 gas Substances 0.000 claims description 35
- 238000002955 isolation Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 4
- 210000000056 organ Anatomy 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 14
- 239000003570 air Substances 0.000 description 8
- 238000007872 degassing Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004320 controlled atmosphere Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- DCSRPHQBFSYJNN-UHFFFAOYSA-L disodium 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].Oc1c(N=Nc2ccccc2[As](O)(O)=O)c2ccc(cc2cc1S([O-])(=O)=O)S([O-])(=O)=O DCSRPHQBFSYJNN-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/34—Venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
- B60P3/22—Tank vehicles
- B60P3/224—Tank vehicles comprising auxiliary devices, e.g. for unloading or level indicating
- B60P3/2255—Ventilating arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Transportation (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
comprend une articulation reliant les deux demi-coques.includes an articulation connecting the two half-shells.
La presente invention concerne un procede d'autorisation de fonctionnement sous atmosphere controlee d'une citerne a dechets a fond ouvrant operant sous vice adaptee au transport et aux operations de The present invention relates to a method of authorizing operation in a controlled atmosphere of a waste tank with an opening bottom operating under vice suitable for transport and operations of
remplissage et de vidange de produits dangereux. filling and emptying of dangerous products.
I1 est frequent de transporter dans des citernes a fond ou vrant des merchandises dangereuses, en particulier des liquides, le cas echeant toxiques ou corrosifs, volatile c'est-a-dire dont la tension de va peur et le point eclair font qu'ils degagent des vapeurs et gaz qui presen tent la particularite d'etre combustibles, done de risquer de s'enflammer o ou eventuellement d'exploser lorsqu'ils vent melanges a de ['air, de ltoxygene, ou un gaz comburant autre en proportion convenable, en pre It is frequent to carry in tanks with bottom or vergant dangerous goods, in particular liquids, the toxic or corrosive, volatile case ie that of which the tension of is fear and the point flash give off vapors and gases which present the characteristic of being combustible, therefore risking ignition or or possibly exploding when mixed with air, oxygen, or an oxidizing gas other in suitable proportion , first
sence d'une source d'ignition.source of ignition.
Ces citernes qui peuvent etre fixes ou demontables vent munies d'accessoires particuliers adaptes pour faciliter le chargement et le dechargement des dechets. On entend par citerne fixe une citerne d'une capacite supe rieure a 1000 litres fixce a demoure sur un vehicule citerne ou faisant These tanks which can be fixed or demountable are fitted with special accessories adapted to facilitate the loading and unloading of waste. The term “fixed tank” is understood to mean a tank with a capacity greater than 1000 liters fixed to remain on a tank vehicle or
partie integrante du chassis d'un tel vehicule. integral part of the chassis of such a vehicle.
De telles citernes vent classiquement equipees d'un circuit de pompage dans loquel est montee une vanne d'isolement ainsi qu'une pompe a vice tournant toujours dans le meme sens et associee a un sys teme de vanne de selection conOcu de facon a lui permettre de fonctionner Such tanks are conventionally equipped with a pumping circuit in which is mounted an isolation valve as well as a vice pump always rotating in the same direction and associated with a system of selection valve designed so as to allow it to work
soit selon un mode d'aspiration soit selon un mode de refoulement. either according to a suction mode or according to a delivery mode.
Lorsqu'elle fonctionne en mode d'aspiration la pompe a vice aspire le ciel gazeux de la citerne et rejette les gaz aspires a ['atmosphere de facon a permettre le remplissage de celle-ci Lorsqu'elle fonctionne en mode de refoulement la pompe a vice aspire de l'air exterieur pour le refouler dans le circuit de pompage et dans la citerne, en particulier de facon a accelerer et/ou faciliter la vi dange de celle-ci en creant une pression a la surface du liquide qui y est contenu. Les citernes de ce type vent en outre classiquement equi pees d'organes de remplissage, d'organes de vidange de dechets et d'organes de manceuvre internee susceptibles de generer, en cas de dis fonctionnement, des etincelles de nature a enflammer une atmosphere ex When operating in suction mode the vice pump sucks the gaseous air from the tank and rejects the aspirated gases to the atmosphere so as to allow filling thereof When it operates in discharge mode the pump vice sucks outside air to discharge it into the pumping circuit and into the tank, in particular in order to accelerate and / or facilitate the draining of the latter by creating a pressure on the surface of the liquid contained therein . Tanks of this type are also conventionally equipped with filling elements, waste emptying elements and internal maneuvering elements capable of generating, in the event of malfunction, sparks such as to ignite an atmosphere ex
plosive par friction, choc ou abrasion. plosive by friction, shock or abrasion.
I1 est a noter que les organes de mancouvre internee sus ceptibles de generer une etincelle peuvent etre des organes mecaniques, hydrauliques ou pneumatiques pouvant etre situes a l'interieur des com partiments de la citerne, dans les accessoires de remplissage et de vidange ou dans les tuyauteries de recuperation des vapeurs. Ces organes peuvent etre des organes de regulation, d'obturation, de cloisonnement s I1 est egalement a noter que l'ouverture du fond arriere peut egalement, dans certains cas particuliers, generer une atmosphere explo sive dans l'environnement immediat de la citerne, pouvant ainsi creer de graves desordres, voire une explosion compte tenu d'une part du contact des gaz ou vapeurs ainsi emis avec des organes pouvant generer une etin o celle, et d'autre part du contact de ces memes gaz ou vapeurs, entrames par l'air ambient, avec les organes thermiques du vehicule porteur ou It should be noted that the internal mancouvre members capable of generating a spark can be mechanical, hydraulic or pneumatic members which can be located inside the compartments of the tank, in the filling and emptying accessories or in the vapor recovery pipes. These bodies can be regulating, closing, partitioning bodies. It is also to be noted that the opening of the rear bottom can also, in certain particular cases, generate an operating atmosphere in the immediate environment of the tank, being able thus to create serious disorders, even an explosion taking into account on the one hand of the contact of the gases or vapors thus emitted with bodies being able to generate an etin o that, and on the other hand of the contact of these same gases or vapors, started by ambient air, with the thermal components of the carrier vehicle or
toute autre source exterieure presentant un point chaud. any other external source with a hot spot.
Compte tenu de cette situation, les materiels du type sus mentionne doivent satisfaire a des normes tres severes qui ont ete etablies s par ['Administration, et les fabricants dolvent prendre des mesures pour eviter une concentration dangereuse de melanges explosifs, empecher ['inflammation d'atmospheres explosives, et minimiser les consequences de ['explosion si elle se produit, pour qu'elle n'ait pas d'effet dangereux sur In view of this situation, equipment of the aforementioned type must meet very strict standards which have been established by the administration, and manufacturers must take measures to avoid a dangerous concentration of explosive mixtures, prevent the ignition of explosive atmospheres, and minimize the consequences of the explosion if it occurs, so that it does not have a dangerous effect on
le milieu environnant.the surrounding environment.
o Dans ce contexte, pour quantifier les risques encourus, les specialistes ont pris l'habitude de definir la notion de limite d'explosivite d'un gaz ou d'une vapeur dans ['air: il n'existe en effet qutune plage limi tee de concentration, specifique a chaque gaz ou vapeur, susceptible de o In this context, to quantify the risks involved, specialists have become accustomed to defining the concept of explosive limit of a gas or vapor in air: there is indeed only a limited range concentration tee, specific to each gas or vapor, capable of
produire un melange combustible.produce a combustible mixture.
s La limite superieure de cette plage est appelee limite supe rieure d'explosivite (LSE) tandis que la limite inferieure de cette plage est s The upper limit of this range is called the upper explosive limit (LSE) while the lower limit of this range is
appelee limite inferieure d'explosivite (LIE). called lower explosive limit (LEL).
Si la concentration d'un gaz combustible ou explosif est in ferieure a la LIE il n'y a pas assez de gaz pour produire une explosion (le melange est trop pauvre) alors qu'a des concentrations superieures a la LSE, le melange comporte insuffisamment d'oxygene pour bruler (il est If the concentration of a combustible or explosive gas is lower than the LEL there is not enough gas to produce an explosion (the mixture is too lean) while at concentrations higher than the LSE, the mixture comprises insufficient oxygen to burn (there is
alors trop riche).then too rich).
L'inflammabilite n'existe done que dans la plage comprise entre la LIE et la LSE, pour chaque gaz ou melange de gaz specifique, et The flammability therefore only exists in the range between the LEL and the LSE, for each specific gas or gas mixture, and
3s en dehors de ces limites, le melange est incapable de combustion. 3s outside these limits, the mixture is incapable of combustion.
Pour minimiser le danger auquel peut etre expose le per sonnel affecte aux operations necessaires au fonctionnement des citernes a dechets operant sous vice, ainsi que toutes les personnel susceptibles de se trouver aux abord s ou dans la sphere d 'influence de s gaz pouvant etre emis suite a ['operation de ces citernes et egalement l'environnement, il est propose, conformement a ['invention un procede d'autorisation de To minimize the danger to which personnel assigned to the operations necessary for the operation of the waste tanks operating under vice may be exposed, as well as all personnel likely to be at first s or in the sphere of influence of s gases which may be emitted following the operation of these tanks and also the environment, there is proposed, in accordance with the invention, a method of authorizing
fonctionnement d'une telle citerne a dechets sous atmosphere controlee. operation of such a waste tank under controlled atmosphere.
Selon ['invention, ce procede est caracterise en ce qutavant tout actionnement des organes de remplissage, des organes de vidange des dechets ou des organes de manccuvre internee et/ou avant toute ou verture de la citerne, on mesure en continu la concentration en gaz com bustible ou explosif du ciel gazeux de la citerne, ou de l'air exterieur de o ['atmosphere, on compare la concentration ainsi mesuree a la LIE et on n'autorise cet actionnement ou cette ouverture que si cette concentration est inferieure a une valeur de seuil predeterminee elle-meme inferieure a According to the invention, this process is characterized in that before any actuation of the filling members, of the waste emptying units or of the internal maneuvering members and / or before any or all of the tank is green, the gas concentration is continuously measured. combustible or explosive from the gaseous sky of the tank, or from the outside air of the atmosphere, the concentration thus measured is compared to the LEL and this actuation or opening is only authorized if this concentration is less than a predetermined threshold value itself less than
la LIE.the dregs.
Selon ['invention, cette valeur de seuil predeterminee est de preference egale a 20 % de la LIE. L'invention se rapporte egalement a un dispositif pour la According to the invention, this predetermined threshold value is preferably equal to 20% of the LEL. The invention also relates to a device for
mise en ccuvre de ce procede.implementation of this process.
Selon ['invention, ce dispositif est caracterise en ce qu'il comporte: une vanne de mise a l'air libre montee sur le dessus de la citerne et as sociee a un actionneur pilote a distance, - un explosimetre antideflagrant monte sur le circuit de pompage de preference du cote refoulement de la pompe a vice, et - un automate programmable susceptible de recevoir les signaux trans s mis par l'explosimetre de facon a comparer la concentration en gaz combustible ou explosif detectee par celui-ci avec la LIE et a afficher le resultat de cette comparaison afn de permettre le cas echeant de pren According to the invention, this device is characterized in that it comprises: a vent valve mounted on the top of the tank and as associated with a remote pilot actuator, - an explosion-proof explosometer mounted on the circuit pumping preferably on the discharge side of the vice pump, and - a programmable controller capable of receiving the trans s signals sent by the explosimeter so as to compare the concentration of combustible or explosive gas detected by it with the LEL and to display the result of this comparison in order to allow the case of taking
dre les mesures necessaires.dre the necessary measures.
Les explosimetres correspondent a des appareils bien so connus des specialistes: il s'agit la de detecteurs de gaz combustibles de type electrocatalytique comportant un element detecteur nomme a perle >> constitue d'un fil de platine bobine a chauffage electrique, recouvert d'une base en ceramique de type alumine et d'une couche exterieure de cataly The explosimeters correspond to devices well known to specialists: these are combustible gas detectors of the electrocatalytic type comprising a detector element called a pearl >> consisting of a platinum wire coil with electric heating, covered with a alumina ceramic base and an outer layer of cataly
seur disperse dans un support de thorine. its disperser in a thorin support.
ss Lorsqu'un melange d'air et de gaz combustible passe sur la surface chaude du catalyseur, il se produit une combustion et la chaleur ss When a mixture of air and combustible gas passes over the hot surface of the catalyst, combustion and heat occur
emise augmente la temperature de la << perle >. emitted increases the temperature of the "pearl".
Ces indications vent transformees en signaux electriques dans un circuit en pont de Wheatstone linerisable et convertible en un These wind indications are transformed into electrical signals in a linerizable Wheatstone bridge circuit convertible into a
courant 4-20 mA raccordable a des appareils exterieurs. current 4-20 mA connectable to external devices.
En consequence, conformement a ['invention, les signaux 4 Consequently, in accordance with the invention, the signals 4
s 20 mA de l'explosimetre vent transmis a ['automate programmable de fa- s 20 mA from the wind explosimeter transmitted to the programmable logic controller
con a lui permettre de determiner la situation du melange gazeux detecte to allow him to determine the situation of the detected gas mixture
par rapport a la LIE.compared to the LEL.
Selon une autre caracteristique de ['invention, ['automate programmable coopere avec l'actionneur de la vanne de mise a l'air libre, o ainsi qu'avec la pompe a vice, la vanne d'isolement et le systeme de vanne According to another characteristic of the invention, the programmable controller cooperates with the actuator of the vent valve, o as well as with the vice pump, the isolation valve and the valve system.
de selection.Selection.
Par suite, toutes les operations liees au fonctionnement de la citerne a dechets peuvent etre pilotees a distance a partir de ['automate programmable. Les caracteristiques du procede ainsi que du dispositif qui font ['objet de ['invention seront decrites plus en detail en se referent aux dessins annexes dans lesquels: - la figure 1 est un schema representant le dispositif fonctionnant en mode d'aspiration, o - la fgure 2 est un schema representant le dispositif fonctionnant en Consequently, all the operations linked to the operation of the waste tank can be controlled remotely from the programmable logic controller. The characteristics of the process as well as of the device which are the object of the invention will be described in more detail with reference to the accompanying drawings in which: - Figure 1 is a diagram representing the device operating in suction mode, o - Figure 2 is a diagram representing the device operating in
mode de refoulement.delivery mode.
Selon les figures 1 et 2, le dispositif conforme a ['invention According to Figures 1 and 2, the device according to the invention
equipe une citerne a dechets 1 comportant un systeme de verrou 2 per- fitted with a waste tank 1 comprising a 2-person locking system
mettant l'ouverture de son fond arriere 3. putting the opening of its rear bottom 3.
La citerne 1 est egalement munie d'organes de remplissage, d'organes de vidange des dechets et d'organes de manceuvre connus en The tank 1 is also provided with filling elements, waste emptying elements and maneuvering elements known in
eux-memes qui ne vent pas representes en detail sur les figures. themselves which are not shown in detail in the figures.
Les organes de remplissage de la citerne 1 comportent en particulier une vanne de vidange 4 situee a la partie inferieure de celle-ci au niveau du fond ouvrant 3 et destinee a permettre un pompage sous vice des dechets, ainsi qu'une vanne de remplissage 5 situee a la partie The filling members of the tank 1 include in particular a drain valve 4 located at the lower part of the latter at the opening bottom 3 and intended to allow a pumping under waste, as well as a filling valve 5 located at the party
superieure de la citerne 1 qui est adaptee a un mode de transport pneu- of tank 1 which is suitable for a pneumatic mode of transport
matique par le haut des dechets avec deversement au point teas. material from the top of the waste with dumping at the teas point.
Selon les figures la citerne 1 est en outre equipee d'un cir cult de pompage 7 ainsi que d'un automate programmable 8 a partir du- quel peuvent etre commandees toutes les operations necessaires a son fonctionnement. Le circuit de pompage est equipe d'une vanne d'isolement 9, d'un filtre 10 ainsi que d'une pompe a vice 11 tournant touj ours dans le meme sens et associee a une vanne de selection quatre voies 12 pouvant etre manccuvree par ['automate 8 de facon a permettre a la pompe a vice 11 de fonctionner soit selon un mode d'aspiration represente sur la figure According to the figures the tank 1 is further equipped with a pumping cir cult 7 as well as a programmable automaton 8 from which all the operations necessary for its operation can be controlled. The pumping circuit is equipped with an isolation valve 9, a filter 10 as well as a vice pump 11 always rotating in the same direction and associated with a four-way selection valve 12 which can be operated by ['automaton 8 so as to allow the vice pump 11 to operate either according to a suction mode represented in the figure
1 soit selon un mode de refoulement represente sur la figure 2. 1 or according to a delivery mode represented in FIG. 2.
Il est a noter que la vanne quatre voies 12 pourrait, sans pour cela sortir du cadre de ['invention etre remplacee par un systeme de It should be noted that the four-way valve 12 could, without departing from the scope of the invention, be replaced by a system of
trots vannes a vole simple.trots valves a simple fly.
o Un explosimetre anti-deflagrant 13 est en outre monte en derivation sur le circuit de pompage 7 du cote refoulement de la pompe a o An explosion-proof explosimeter 13 is also mounted as a bypass on the pumping circuit 7 on the discharge side of the pump a
vice 1 1.vice 1 1.
Une vanne de mise a l'air libre 14 associee a un actionneur A vent valve 14 associated with an actuator
pilote a distance par ['automate 8 est montee sur le dessus de la ci- remote pilot by the automaton 8 is mounted on the top of the
terne 1.dull 1.
Selon la figure 1, lorsque la pompe a vice 11 fonctionne se- According to Figure 1, when the pump has vice 11 operates se-
lon le mode d'aspiration, elle aspire le ciel gazeux de la citerne 1 et rejette les gaz aspires a ['atmosphere selon les fleches a a >, de faOcon a permettre le lon the suction mode, it sucks the gaseous sky of the tank 1 and rejects the aspirated gases to the atmosphere according to the arrows a>, so as to allow the
remplissage de cette citerne.filling of this tank.
o Selon la figure 2, lorsque la pompe a vice 11 fonctionne se lon le mode de refoulement, celle-ci aspire de l'air exterieur pour le refou ler dans le circuit de pompage 7 puis dans la citerne 1 en particulier de facon a accelerer et/ou faciliter la vidange de celle-ci en creant une pres o According to Figure 2, when the vice pump 11 operates according to the discharge mode, it sucks in outside air to discharge it into the pumping circuit 7 then into the tank 1 in particular so as to accelerate and / or facilitate the emptying thereof by creating a pres
sion a la surface du liquide qui y est contenu. the surface of the liquid contained therein.
:5 Selon les figures 1 et 2, avant tout actionnement des orga nes de remplissage, des organes de vidange des dechets ou des organes de manceuvre internee de la citerne 1 et avant toute ouverture du fond 3 de celle-ci, l'explosimetre 13 mesure en continu la concentration en gaz com bustible ou explosif du melange gazeux circulant dans le circuit de pom page et transmet a ['automate 8 des signaux << c >, representatifs de cette concentration. L'automate 8 compare la concentration ainsi mesuree a la : 5 According to FIGS. 1 and 2, before any actuation of the filling organs, of the waste emptying bodies or of the internal maneuvering bodies of the tank 1 and before any opening of the bottom 3 of the latter, the explosimeter 13 continuously measures the concentration of combustible or explosive gas in the gas mixture circulating in the pumping circuit and transmits to the automaton 8 signals << c>, representative of this concentration. The controller 8 compares the concentration thus measured with the
LIE, et affiche le resultat de cette comparaison sur un ecran 16. LIE, and displays the result of this comparison on a screen 16.
Parallelement, ['automate 8 commande les mesures pouvant etre necessitees par la situation de la concentration en gaz combustible ou explosif du melange circulant dans le circuit de pompage 7 par rapport a At the same time, the automaton 8 controls the measures that may be required by the situation of the concentration of combustible or explosive gas in the mixture circulating in the pumping circuit 7 with respect to
la valeur correspondante de la LIE.the corresponding value of the LEL.
De maniere plus precise, ['automate 8 est programme de maniere a autoriser les sequences suivantes: - Avant le debut du pompage, que ce soit dans la citerne 1 vice avant le premier pompage ou dans le ciel gazeux de celle-ci lau s dessus des dechets qui y vent contenus) pour les pompages ulte rieurs. L'automate 8 commande l'ouverture de la vanne d'isolement 9 et de la vanne de mise a l'air libre 14 ainsi que la mise en route de la pompe a vice 11 de sorte qu'elle fonctionne selon le mode d'aspiration re More precisely, the automaton 8 is programmed to authorize the following sequences: - Before the start of pumping, whether in tank 1 vice before the first pumping or in the gaseous sky thereof above it waste contained therein) for subsequent pumping. The controller 8 controls the opening of the isolation valve 9 and the vent valve 14 as well as the starting of the pump a vice 11 so that it operates according to the mode of aspiration re
o presente sur la figure 1.o shown in Figure 1.
L'explosimetre 13 mesure alors en continu la concentration en gaz combustible ou explosif du melange gazeux circulant dans le cir cuit de pompage 7 qui correspond a celle du ciel gazeux de la citerne et The explosimeter 13 then continuously measures the concentration of combustible or explosive gas in the gas mixture circulating in the pumping circuit 7 which corresponds to that of the gas overhead of the tank and
transmet cette information a ['automate 8. transmits this information to the controller 8.
s Si la valeur de cette concentration est superieure a un pourcentage predetermine de la LIE ['automate 8 commande la pour-quite s If the value of this concentration is greater than a predetermined percentage of the LEL [the automaton 8 controls the pros
du degazage.degassing.
Au contraire, si cette concentration est inferieure a un pourcentage predetermine de la LIE, ['automate 8 commande la fermeture de la vanne de mise a l'air libre 14 et ['aspiration des dechets soit par la On the contrary, if this concentration is lower than a predetermined percentage of the LEL, the automaton 8 controls the closing of the vent valve 14 and the suction of the waste either by
vanne de vidange 4 soit par la vanne de remplissage 5. drain valve 4 or by filling valve 5.
- Operation de degazage prealable au fonctionnement des organes de regulation, d'obturation et de cloisonnement L'automate 8 commande ltouverture de la vanne d'isolement 2s 9 et de la vanne de mise a l'air libre 14 ainsi que la mise en route de la pompe a vice 11 de sorte qu'elle fonctionne selon le mode d'aspiration re - Degassing operation prior to the operation of the regulating, closing and partitioning devices The automaton 8 controls the opening of the isolation valve 2s 9 and of the vent valve 14 as well as the start-up of the pump has vice 11 so that it operates according to the suction mode re
presente sur la figure 1.shown in Figure 1.
L'explosimetre 13 mesure alors en continu la concentration en gaz combustible ou explosif du melange gazeux circulant dans le cir cult de pompage 7 qui correspond a celle du ciel gazeux de la citerne et The explosimeter 13 then continuously measures the concentration of combustible or explosive gas in the gas mixture circulating in the pumping cir 7 which corresponds to that of the gas headspace of the tank and
transmet cette information a ['automate 8. transmits this information to the controller 8.
Si la valeur de cette concentration est superieure a un pourcentage predetermine de la LIE, ['automate 8 commande la pour-quite If the value of this concentration is greater than a predetermined percentage of the LEL, the automaton 8 controls the pros
du degazage.degassing.
ss Au contraire, si cette concentration est inferieure a un pourcentage predetermine de la LIE, ['automate 8 commande la fermeture de la vanne de mise a l'air libre 14 et la mise en position refoulement de la vanne de selection 12 comme represente sur la figure 2 L'explosimetre 13 mesure alors en continu la concentration en gaz combustible ou explosif du melange gazeux circulant dans le cir cuit de pompage 7 qui correspond a celle de l'air exterieur de ['atmosphere aspire. s L'explosimetre 13 transmet cette information a ss On the contrary, if this concentration is lower than a predetermined percentage of the LEL, the automaton 8 controls the closing of the vent valve 14 and the setting in discharge position of the selection valve 12 as represented on FIG. 2 The explosimeter 13 then continuously measures the concentration of combustible or explosive gas in the gas mixture circulating in the pumping circuit 7 which corresponds to that of the outside air of the aspirated atmosphere. s Explosimeter 13 transmits this information to
['automate 8.['PLC 8.
Si cette concentration est superieure a un pourcentage pre determine de la LIE, ['automate 8 commande l'arret du refoulement, ctest If this concentration is greater than a predetermined percentage of the LEL, the automaton 8 controls the stopping of the delivery, this is
a-dire l'arret de la pompe a vice 11. that is to say the pump stops working 11.
o Au contraire, si cette concentration est inferieure a un o On the contrary, if this concentration is lower than a
pourcentage predetermine de la LIE, le refoulement peut se poursuivre. predetermined percentage of LEL, repression can continue.
- Avant l'ouverture du fond arriere L'automate 8 commande l'ouverture de la vanne d'isolement 9 et de la vanne de mise a l'air libre 14 ainsi que la mise en route de la s pompe a vice 11 de sorte qu'elle fonctionne selon le mode d'aspiration re - Before the opening of the rear end The automaton 8 controls the opening of the isolation valve 9 and the vent valve 14 as well as the start-up of the vice pump 11 so that it works according to the suction mode re
presente sur la figure 1.shown in Figure 1.
L'explosimetre 13 mesure alors en continu la concentration en gaz combustible ou explosif du melange gazeux circulant dans le cir cuit de pompage 7 qui correspond a celle du ciel gazeux de la citerne et The explosimeter 13 then continuously measures the concentration of combustible or explosive gas in the gas mixture circulating in the pumping circuit 7 which corresponds to that of the gas overhead of the tank and
transmet cette information a ['automate 8. transmits this information to the controller 8.
Si la valeur de cette concentration est superieure a un pourcentage predetermine de la LIE, ['automate 8 commande la pour-quite If the value of this concentration is greater than a predetermined percentage of the LEL, the automaton 8 controls the pros
du degazage.degassing.
Au contraire si cette concentration est inferieure a un pour 2s centage predetermine de la LIE, ['automate 8 commande l'arret de la pompe a vice 11 et la fermeture de la vanne dtisolement 9 et de la vanne On the contrary, if this concentration is lower than one for 2s predetermined percent of the LEL, the automaton 8 controls the stop of the vice pump 11 and the closing of the isolation valve 9 and of the valve.
de mise a l'air libre 14.vent 14.
Les verrous 2 du fond arriere 3 peuvent alors etre dever The locks 2 on the rear bottom 3 can then be released
rouilles et le fond peut alors etre ouvert. rust and the bottom can then be opened.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0205790A FR2839493B1 (en) | 2002-05-10 | 2002-05-10 | PROCESS FOR AUTHORIZING THE OPERATION OF A HAZARDOUS WASTE TANK OPERATING IN VACUUM AS WELL AS A DEVICE FOR CARRYING OUT THIS PROCESS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0205790A FR2839493B1 (en) | 2002-05-10 | 2002-05-10 | PROCESS FOR AUTHORIZING THE OPERATION OF A HAZARDOUS WASTE TANK OPERATING IN VACUUM AS WELL AS A DEVICE FOR CARRYING OUT THIS PROCESS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2839493A1 true FR2839493A1 (en) | 2003-11-14 |
| FR2839493B1 FR2839493B1 (en) | 2004-07-09 |
Family
ID=29286392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0205790A Expired - Fee Related FR2839493B1 (en) | 2002-05-10 | 2002-05-10 | PROCESS FOR AUTHORIZING THE OPERATION OF A HAZARDOUS WASTE TANK OPERATING IN VACUUM AS WELL AS A DEVICE FOR CARRYING OUT THIS PROCESS |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2839493B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1548195A1 (en) * | 2003-12-24 | 2005-06-29 | Rivard | Device and method for preventing the formation of an unhealthy and/or explosive atmosphere in the vicinity of a liquid tank |
| EP2181888A1 (en) * | 2008-10-28 | 2010-05-05 | Cappellotto S.p.A. | Suction apparatus for suctioning combustible material |
| ITPD20130254A1 (en) * | 2013-09-19 | 2015-03-20 | Jurop S P A | METHOD FOR SAFETY MANAGEMENT OF FLAMMABLE SUBSTANCES |
| EP3056382A1 (en) * | 2015-02-10 | 2016-08-17 | Siemens Aktiengesellschaft | A transportation system for transporting resin and a method for transporting resin |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2018587A (en) * | 1978-01-31 | 1979-10-24 | Boc Ltd | Method and apparatus for storage and transport |
| EP0118738A2 (en) * | 1983-02-15 | 1984-09-19 | KUKA Umwelttechnik GmbH | Refuse collecting vehicle |
-
2002
- 2002-05-10 FR FR0205790A patent/FR2839493B1/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2018587A (en) * | 1978-01-31 | 1979-10-24 | Boc Ltd | Method and apparatus for storage and transport |
| EP0118738A2 (en) * | 1983-02-15 | 1984-09-19 | KUKA Umwelttechnik GmbH | Refuse collecting vehicle |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1548195A1 (en) * | 2003-12-24 | 2005-06-29 | Rivard | Device and method for preventing the formation of an unhealthy and/or explosive atmosphere in the vicinity of a liquid tank |
| FR2864523A1 (en) * | 2003-12-24 | 2005-07-01 | Rivard | PROCESS FOR PREVENTING THE FORMATION OF AN INSALUBRE AND / OR EXPLOSIVE ATMOSPHERE IN THE ENVIRONMENT OF A CISTERN AND A DEVICE FOR CARRYING OUT SAID METHOD |
| EP2181888A1 (en) * | 2008-10-28 | 2010-05-05 | Cappellotto S.p.A. | Suction apparatus for suctioning combustible material |
| ITPD20130254A1 (en) * | 2013-09-19 | 2015-03-20 | Jurop S P A | METHOD FOR SAFETY MANAGEMENT OF FLAMMABLE SUBSTANCES |
| EP2851241A2 (en) | 2013-09-19 | 2015-03-25 | Jurop S.p.A. | Method for safely managing flammable substances |
| EP2851241A3 (en) * | 2013-09-19 | 2016-11-30 | Jurop S.p.A. | Method for safely managing flammable substances |
| EP3056382A1 (en) * | 2015-02-10 | 2016-08-17 | Siemens Aktiengesellschaft | A transportation system for transporting resin and a method for transporting resin |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2839493B1 (en) | 2004-07-09 |
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