EP2489922A2 - Verfahren zum Einführen/Herausnehmen eines Instruments in einem Behälter - Google Patents

Verfahren zum Einführen/Herausnehmen eines Instruments in einem Behälter Download PDF

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Publication number
EP2489922A2
EP2489922A2 EP12154584A EP12154584A EP2489922A2 EP 2489922 A2 EP2489922 A2 EP 2489922A2 EP 12154584 A EP12154584 A EP 12154584A EP 12154584 A EP12154584 A EP 12154584A EP 2489922 A2 EP2489922 A2 EP 2489922A2
Authority
EP
European Patent Office
Prior art keywords
shuttle
guide
recess
tank
pressure
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
Application number
EP12154584A
Other languages
English (en)
French (fr)
Other versions
EP2489922A3 (de
EP2489922B1 (de
Inventor
Pierre Langry
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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 Electricite de France SA filed Critical Electricite de France SA
Publication of EP2489922A2 publication Critical patent/EP2489922A2/de
Publication of EP2489922A3 publication Critical patent/EP2489922A3/de
Application granted granted Critical
Publication of EP2489922B1 publication Critical patent/EP2489922B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/038—Control means using cameras
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0478—Position or presence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0486—Indicating or measuring characterised by the location
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/015—Facilitating maintenance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/044—Avoiding pollution or contamination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • F17C2270/0136—Terminals

Definitions

  • the invention relates to a method for producing the input / output of an instrument in a tank, an airlock for carrying out such a method and a tank equipped with such an airlock.
  • the method is particularly adapted to allow the introduction or withdrawal of a high level liquid detector in a cryogenic tank, that is to say a storage tank containing a low temperature liquid (typically less than -50). ° C), with a gaseous sky at a pressure above atmospheric pressure. It is also suitable for the introduction of other types of instruments, for example a camera.
  • LNG liquefied natural gas
  • LNG is stored at about -165 ° C
  • the gaseous reservoir is made up of natural gas resulting from the evaporation of LNG.
  • frost may form and seize the interface between the instrument and the tank.
  • the present invention aims to remedy all or some of the disadvantages mentioned above, that is to say in particular to provide a method for performing the input / output of an instrument in a tank containing a gas under pressure, for example a flammable gas at cryogenic temperature.
  • process for the entry / exit of an instrument is meant a method comprising either bringing an instrument into the reservoir, or taking out an instrument, or both in any order.
  • the tank may be in particular an LNG storage tank.
  • Such a reservoir is at a temperature of about -165 ° C and also contains natural gas (in the gaseous state) at low temperature forming a gaseous sky.
  • the method allows the introduction of an instrument inside the tank or the removal of this instrument, for example for maintenance or replacement.
  • the instrument can be of any type. It can provide information on the inside of the tank or act inside the tank (case of a probe). It can in particular be a liquid presence detector, for example used as a level detector in the tank. It can also be a camera.
  • the method uses a shuttle that carries the instrument, the shuttle being able to circulate in a guide which passes through a wall of the tank.
  • the shuttle can also have a protective role of the instrument.
  • the recess as delimited from the solution of the invention forms a delimited space (also called "room” in the following description).
  • the technical problem is solved by the fact that the guide and the shuttle cooperate to form a room between the guide and the shuttle, the room around the shuttle, and that when the shuttle moves, we keep in the room a pressure greater than or equal to that prevailing in the tank.
  • the chamber may have a rather small volume compared to the volume of the interior of the guide. It can even be reduced to a gap between the guide and the shuttle.
  • the pressurization can be carried out by injection of an inert gas.
  • injection it is to be understood that the chamber is in fluid connection with a higher pressure source than the chamber itself, so that inert gas flows into the chamber to raise the pressure and pressure of the chamber. maintain.
  • the chamber is a space that interposes on the passage of the gas contained in the tank likely to leak outwardly by the interstitial space between the shuttle and the guide. Since the chamber is at a pressure greater than the pressure prevailing in the tank, and greater than atmospheric pressure, inert gas can leak from the chamber towards the inside of the tank, or from the chamber towards the outside of the tank. A leak of the gas contained in the tank to the outside becomes impossible because it should pass through the chamber.
  • This active step using an inert gas source can be implemented permanently, but it plays a particular role in the sealing of the tank when other sealing means of a more permanent nature, such as flanged joints or faucets, were temporarily opened to allow the passage of the shuttle in the guide.
  • Inert gas means a gas whose introduction into the tank or escape to the outside is not dangerous.
  • the surface of the guide defining the recess remains the same, the guide being fixed, while the surface of the shuttle defining the recess changes as the shuttle moves.
  • the inner surface of the guide defining the chamber comes into contact with the outer surface of the shuttle in a contact zone.
  • the fact of having a contact minimizes the possible leak of inert gas towards the tank or towards the outside.
  • the amount of inert gas consumed is a priori very low. As a first approximation, it is proportional to the overpressure, to the duration of the step and to a coefficient that is smaller as the contact between the guide and the shuttle is narrow.
  • the guide and the shuttle are shaped to minimize leakage. In any case, a leak from the inside of the tank to the outside by the interstitial space between the guide and the shuttle remains impossible as long as the pressure in the chamber is greater than or equal to that prevailing in the tank.
  • the inert gas comprises nitrogen at a concentration greater than or equal to 99% by volume.
  • Nitrogen is a gas frequently used for inerting. Its mixing with LNG evaporation gas poses no danger. The evaporation gas often also comprises nitrogen in a significant amount. A possible leak of nitrogen outside the tank is also not dangerous in an open atmosphere.
  • the pressure maintained in the recess may be between 105% and 150% of the pressure of the fluid contained in the reservoir.
  • the guide comprises at least two seals located at the respective extensions of the inner surface of the guide.
  • These seals make it possible to virtually cancel the possibility of an inert gas leak from the chamber to the tank or to the outside.
  • these seals make it even less possible to escape natural gas to the outside.
  • the guide includes an internal passage for allowing the shuttle to circulate between at least a first position where it is partially or completely inside the tank and a second position where it is outside.
  • the first position is a position where the instrument is in the tank. In the second position, the instrument and the shuttle are out of the tank.
  • the chamber defined by an inner surface of the guide cooperating with an outer surface of the shuttle, has at least one inlet intended to be connected with a source of inert gas, so that it can be maintained at a pressure greater than or equal to that which reigns in the tank.
  • the input is at the inner surface of the guide.
  • the first aforementioned element is typically a flange.
  • the second element is for example a full-flow valve, the shuttle engaging in the valve when it moves from the second position to the first position and the shuttle remaining engaged in the valve when in the first position.
  • the outer surface of the shuttle has a marker placed so that from a point of observation external to the reservoir, it is hidden by the guide when the shuttle is engaged in the second element and that visible when the shuttle is clear of the second element.
  • This mark makes it possible to know when the second element for the opening / closing of the passage can be closed. It may be a mark in the shuttle or any other form of signal.
  • the distance between this marker and the end of the shuttle located on the side of the reservoir may be substantially equal to the distance between the second element and the opening of the guide on the side opposite the reservoir.
  • the guide comprises at least two seals located at the respective extensions of the inner surface of the guide.
  • the outer surface of the shuttle is cylindrical and has no sharp stop in the given direction of sliding.
  • the outer surface of the shuttle is circular.
  • the first element for the opening / closing of the passage in the guide can ensure a permanent seal when the shuttle is in the first position (or engaged position), the instrument being in the tank.
  • This first element can be a flange, which ensures a good seal permanently, and can be removed to extract the shuttle.
  • This flange may comprise one or more seals.
  • the second element for the opening / closing of the passage in the guide can ensure a permanent seal when the shuttle is in the second position (when in the extended position). It may be a full-flow faucet, which has the advantage that when opened, the shuttle can be left engaged in the faucet.
  • the contact can be improved by the presence of at least two seals located at the respective extensions of the internal surface of the guide, at the contact zone of the inner surface of the guide and the surface. external of the shuttle, sealing towards the tank and towards the external atmosphere.
  • this cylindrical portion does not present a sharp stop, whether it is retracting or protruding, in particular in the direction of sliding. Indeed, such edges, create a wedge or a point in the structure and in possible seals. The absence of stops therefore represents an advantage in terms of sealing.
  • the invention finally relates to a reservoir for containing liquefied natural gas and a gaseous sky of natural gas at a pressure greater than atmospheric pressure, characterized in that it comprises an airlock as described above, the recess being fluidly connected via the inlet to a source of inert gas capable of maintaining in the recess a pressure greater than or equal to the pressure of the gas head contained in the reservoir.
  • an airlock according to the invention is shown. It has a guide 4 anchored in the domed roof 1b of a tank 1 of liquefied natural gas (or "LNG") 1a.
  • the tank is partially represented.
  • a shuttle 3 is in the engaged position in the tank. It borrows a passage 5a provided in the guide in a given direction 5, which is here vertical.
  • the shuttle passes through a second roof 1 c of the tank for thermally insulating the LNG 1a and its gaseous sky from the upper parts of the tank 1.
  • a source 6b of industrial grade nitrogen that can flow to an inlet 6a in a room formed by the guide and the shuttle.
  • the shuttle 3 has a generally tubular shape with a rounded end on the tank side.
  • an instrument 2 which instrument is attached to the shuttle with fastening means such as hardware, welding or other.
  • the instrument 2 may be for example an LNG presence detector, comprising a thermocouple or a controlled float.
  • the instrument can also be a camera or any other element to collect information on the tank.
  • the instrument can also be an element intended to have an active role in the tank.
  • the shuttle is potentially mobile in the given direction 5. In this position of the shuttle, the tank is sealed at the flange 4d closing the guide 4 in the upper part, the side opposite the tank.
  • the chamber 6 has an inlet 6a for connecting the chamber to a source of inert gas 6b through a pipe 6c.
  • the inert gas may be nitrogen with a purity greater than or equal to 99% by volume, preferably greater than or equal to 99.99% by volume.
  • it is possible in certain phases of use of the shuttle to maintain in the chamber a pressure greater than or equal to that of the reservoir. In general, it is a pressure between 105% and 150% of that of the tank, so as to prevent any leakage of the tank to the outside.
  • An LNG tank typically has a relative internal pressure of about 100 to 300 hPa, an absolute pressure of about 1.1 to 1.3 atmospheres.
  • two O-rings or lip seals 7a and 7b are arranged in the contact area closing the chamber between the inner surface of the guide and the outer surface of the shuttle.
  • the shuttle has a round shape, without sharp edges (protruding or reentrant) in the direction of 5 sliding. Indeed, such edges reduce the seal and increase the consumption of inert gas to maintain the desired pressure in the chamber.
  • FIGS. 4A to 4D illustrate different phases of a method according to the invention, implementing the airlock described above to remove an instrument, and then enter into an LNG tank.
  • the tank is symbolized by its domed roof 1b.
  • the guide 4 and the shuttle 3 of the airlock are represented in a stylized manner.
  • the chamber 6 is connected by the pipe 6c to a source of inert gas, not shown.
  • the shuttle is in a first position, the instrument being engaged in the tank.
  • the flange 4d is in place, sealing the tank.
  • the full-flow valve 4th is open, the shuttle passing through.
  • the stop valve of the pipe 6c is closed. This is a normal use position of the instrument 2 in the tank.
  • the detection of a visual cue 3b present on the external surface of the shuttle makes it possible to confirm that the shuttle is sufficiently raised in the guide.
  • the valve 4e In this position to exit the instrument, the valve 4e being cleared, it can be closed. It then seals the tank as long as necessary to repair or change the instrument for example. We can then stop keeping the chamber 6 under pressure, since the relay was taken by the valve 4e.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Toys (AREA)
EP12154584.2A 2011-02-17 2012-02-08 Verfahren zum Einführen/Herausnehmen eines Instruments in einem Behälter Active EP2489922B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1151314A FR2971831B1 (fr) 2011-02-17 2011-02-17 Procede pour realiser l'entree/sortie d'un instrument dans un reservoir.

Publications (3)

Publication Number Publication Date
EP2489922A2 true EP2489922A2 (de) 2012-08-22
EP2489922A3 EP2489922A3 (de) 2017-07-12
EP2489922B1 EP2489922B1 (de) 2018-05-16

Family

ID=44370580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12154584.2A Active EP2489922B1 (de) 2011-02-17 2012-02-08 Verfahren zum Einführen/Herausnehmen eines Instruments in einem Behälter

Country Status (4)

Country Link
EP (1) EP2489922B1 (de)
JP (1) JP5328946B2 (de)
KR (1) KR101315977B1 (de)
FR (1) FR2971831B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0715049B2 (ja) 1986-12-01 1995-02-22 大日本インキ化学工業株式会社 熱可塑性樹脂組成物

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1366755A (fr) * 1962-12-28 1964-07-17 Gaz De France Procédé et dispositif pour le prélèvement d'échantillons de gaz liquéfiés à très basse température
FR2290628A1 (fr) * 1974-11-05 1976-06-04 Elf Monagaz Procede et dispositif de demontage et de remontage d'un accessoire necessaire a l'etancheite d'un reservoir de fluide sous pression
JPS54149918A (en) * 1978-05-16 1979-11-24 Kawasaki Heavy Ind Ltd Construction of level gauge fitting section of tanks
FR2543261B1 (fr) * 1983-03-25 1985-08-16 Gaz De France Dispositif d'observation a l'interieur d'un reservoir cryogenique en service
JPS62297600A (ja) * 1986-06-16 1987-12-24 Tokyo Gas Co Ltd タンク内部の観察装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
KR20120094866A (ko) 2012-08-27
EP2489922A3 (de) 2017-07-12
EP2489922B1 (de) 2018-05-16
JP2012172846A (ja) 2012-09-10
FR2971831B1 (fr) 2013-03-29
JP5328946B2 (ja) 2013-10-30
FR2971831A1 (fr) 2012-08-24
KR101315977B1 (ko) 2013-10-08

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