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
  • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
• • 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
  • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
  • F17C2201/01—Shape
  • F17C2201/0147—Shape complex
  • F17C2201/0157—Polygonal
• • 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
  • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
  • F17C2201/05—Size
  • F17C2201/052—Size large (>1000 m3)
• • 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
  • F17C2203/00—Vessel construction, in particular walls or details thereof
  • F17C2203/03—Thermal insulations
  • F17C2203/0304—Thermal insulations by solid means
  • F17C2203/0358—Thermal insulations by solid means in form of panels
• • 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
  • F17C2205/01—Mounting arrangements
  • F17C2205/0153—Details of mounting arrangements
  • F17C2205/018—Supporting feet
• • 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
  • F17C2209/00—Vessel construction, in particular methods of manufacturing
  • F17C2209/23—Manufacturing of particular parts or at special locations
• • 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
  • F17C2260/00—Purposes of gas storage and gas handling
  • F17C2260/01—Improving mechanical properties or manufacturing
  • F17C2260/013—Reducing manufacturing time or effort
• • 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
  • F17C2270/0102—Applications for fluid transport or storage on or in the water
  • F17C2270/0105—Ships
  • F17C2270/0107—Wall panels

Definitions

• the invention relates to the field of tanks, sealed and thermally insulating, for the storage and / or transport of a fluid, such as a cryogenic fluid. Sealed and thermally insulating vessels are used in particular for the storage of liquefied natural gas (LNG), which is stored at atmospheric pressure at about -162 ° C.
• LNG liquefied natural gas
• the invention relates more particularly to a method of assembling such a sealed and thermally insulating vessel.
• the document FR2785034 discloses a sealed and thermally insulating liquefied natural gas storage tank which is installed in the double hull of a ship.
• the sealed and thermally insulating tank comprises walls which have a multilayer structure consisting successively of a secondary thermally insulating barrier resting against the inner hull of the ship, a secondary sealing membrane resting against the secondary thermally insulating barrier; a primary thermally insulating barrier resting against the secondary sealing membrane and a primary sealing membrane intended to be in contact with the liquefied gas contained in the tank.
• the tank is equipped with a loading / unloading tower to load the cargo in the tank, before its transport, and to unload the cargo, after its transport.
• the secondary and primary thermally insulating barriers as well as the secondary and primary sealing membranes are mounted in the double hull of the ship and anchored to it and then the loading / unloading tower is mounted in the tank and attached to the double hull of the vessel.
• Document JP S56146485 describes a method of assembling a sealed and thermally insulating tank according to the prior art.
• An idea underlying the invention is to provide a method of assembling a sealed and thermally insulating tank which reduces the assembly time.
• the invention provides a method for assembling a sealed and thermally insulating tank for storing a fluid inside a bearing structure, said bearing structure having a generally polyhedral shape defined by a plurality of walls, said plurality of walls having an upper wall, a lower wall, and a first transverse wall extending vertically between the top wall and the bottom wall; the assembly method comprising the following steps:
• a scaffolding inside the support structure, said scaffolding having a support frame bearing against the bottom wall and a plurality of horizontal platforms, fixed on the support frame; each of the platforms having an opening; the openings of the platforms being arranged one above the other so as to provide a vertical passage through the platforms;
• the platforms furthermore each have a bridge between the opening of said scaffold and the first transverse wall. These bridges allow access to the zones of the first transverse wall located between the loading / unloading tower and said first transverse wall in order to anchor at least the waterproofing membrane, while said loading / unloading tower extends inside the supporting structure.
• the scaffold comprises an elevator capable of moving vertically through the portion of the openings adjacent to the first transverse wall.
• an elevator is able to move between the loading / unloading tower and the first transverse wall when said loading / unloading tower extends inside the supporting structure, which allows the operators to access the zones. of the load-bearing structure behind the loading / unloading tower.
• such a method may have one or more of the following characteristics.
• the openings of the platforms are formed near the first transverse wall.
• the first transverse wall is the wall of the carrier structure closest to the openings.
• the gateways close the contour of the openings of the platforms.
• the distance L between the loading / unloading tower and the sealing membrane of the first transverse wall is greater than 0.80 m, advantageously greater than 1 m and preferably greater than or equal to 1.50 m. m.
• the distance L between the loading / unloading tower and the sealing membrane of the first transverse wall is less than 10 meters, advantageously less than 5 meters and preferably less than 3 meters. This optimizes the amount of cargo that can be discharged, especially when the vessel is onboard a vessel and the first transverse wall is a rear wall.
• the loading / unloading tower comprises three masts which are fixed to each other by crosspieces and which each extend vertically along a central axis; the three central axes of the masts defining in projection in a horizontal plane the vertices of a triangle; said triangle being oriented with respect to the first transverse wall so that one of the three vertices of the triangle is arranged closer to the first transverse wall than are the other two vertices. This facilitates access to the areas of the first transverse wall behind the loading / unloading tower.
• the triangle is equilateral.
• the triangle is oriented so that a bisector of an angle of the triangle defined by two sides of the triangle joining at the apex of the triangle which is disposed closest to the first transverse wall forms with said first transverse wall at an angle between 45 ° and 135 °.
• the angle a is between 70 and 110 °.
• the angle a is equal to 90 °. This further facilitates access to the areas of the first transverse wall behind the loading / unloading tower.
• the upper wall comprises a liquid dome projecting upwards from the upper wall of the supporting structure, the opening formed in the upper wall through which the loading / unloading tower is lowered being provided in the liquid dome and the attachment of the loading / unloading tower to the upper wall of the supporting structure comprising the steps of securing a cover on the liquid dome so as to cover the opening in the liquid dome and to secure said tower loading / unloading on said lid.
• the loading / unloading tower comprises three hollow masts and the inside of the supporting structure is ventilated by at least one of the masts thereby forming a ventilation duct when the lid is fixed on the dome. liquid.
• the liquid dome is positioned at a distance from the first transverse wall, the upper wall of the support structure comprising a horizontal portion connecting the first transverse wall of the supporting structure to a vertical transverse wall of the liquid dome.
• the liquid dome has a vertical transverse wall which extends in the extension of the first transverse wall.
• the liquid dome has two transverse walls and two lateral walls that extend vertically.
• an insulating element of the thermally insulating barrier is anchored against a central part of the lid; the insulating elements of the thermally insulating barrier are anchored against the transverse and lateral walls of the liquid dome;
• the temporary support means are equipped with lifting means, such as cylinders.
• the support frame of the scaffolding is equipped with vertically retractable legs and by means of which said support frame bears against the lower wall of the supporting structure and successively retracts said feet.
• a secondary thermally insulating barrier resting against the carrier structure and a secondary sealing membrane resting against the secondary thermally insulating barrier; the primary thermally insulating barrier resting against the secondary waterproofing membrane and successively retracting the feet during the anchoring of the heat barrier Secondary insulation and secondary waterproofing membrane on the bottom wall of the supporting structure.
• the platforms have retractable edges, for example horizontally, and each of said edges is retracted as the thermally insulating barrier and the waterproofing membrane are anchored to the wall of the wall. the bearing structure opposite said edge.
• the bridges have an edge opposite the first transverse wall which is retractable and said edge is retracted as the thermally insulating barrier and the waterproofing membrane are anchored on the first transverse wall.
• each of the walls of the supporting structure is further anchored to a secondary heat-insulating barrier resting against the supporting structure and a secondary sealing membrane resting against the secondary thermally insulating barrier; the thermally insulating barrier resting against the secondary waterproofing membrane.
• each wall of the tank has successively, from the outside towards the inside, in the thickness direction of the wall, a secondary heat-insulating barrier, a secondary sealing membrane anchored to the thermal barrier.
• secondary insulation a primary thermally insulating barrier resting against the secondary sealing membrane and a primary sealing membrane anchored to the primary thermally insulating barrier and intended to be in contact with the fluid contained in the tank.
• the carrier structure is embedded on a ship and the first transverse wall is a rear wall.
• At least the primary waterproofing membrane is anchored to the first transverse wall after the descent of the loading / unloading tower.
• at least the primary sealing membrane and the primary thermally insulating barrier are anchored to the first transverse wall after the descent of the loading / unloading tower.
• at least the primary waterproofing membrane, the primary thermally insulating barrier and the membrane secondary sealing are anchored to the first transverse wall after the descent of the loading / unloading tower.
• at least the primary waterproofing membrane, the primary heat-insulating barrier, the secondary waterproofing membrane and the secondary thermal-insulating barrier are anchored to the first transverse wall subsequent to the descent of the loading tower. unloading.
• the support structure is constituted by the double hull of a ship.
• FIG. 1 is a partial schematic view of a carrier structure for receiving the walls of a sealed tank and thermally insulating.
• FIG. 2 is a schematic view of the multilayer structure of the walls of the tank.
• FIG. 3 is a schematic view illustrating a loading / unloading tower and partially illustrating the supporting structure inside which it is mounted.
• FIG. 4 is a schematic illustration showing the arrangement of the masts of the loading / unloading tower relative to the rear wall of the carrier structure according to one embodiment.
• FIG. 5 is a schematic illustration showing the arrangement of the masts of the loading / unloading tower relative to the rear wall of the carrier structure according to another embodiment.
• - Figure 6 is a partial longitudinal sectional view of the sealed and thermally insulating tank at the liquid dome and the loading / unloading tower according to one embodiment.
• - Figure 7 is a partial longitudinal sectional view of the sealed and thermally insulating tank at the liquid dome and the loading / unloading tower according to another embodiment.
• FIG. 8 is a schematic perspective view partially illustrating the supporting structure and the scaffold assembled within the carrier structure for the assembly of the sealed tank and thermally insulating; the platforms are not equipped with bridges arranged between the openings in the platforms and the rear wall of the supporting structure.
• FIG. 9 is a diagrammatic perspective view partially illustrating the carrying structure as well as the scaffolding installed inside the carrying structure, the platforms being equipped with bridges arranged between the openings made in the platforms and the rear wall of the supporting structure.
• FIG 10 is a top view of one of the platforms of the scaffold, as shown in Figure 8.
• FIG. 11 is a top view of one of the platforms of the scaffold, as shown in Figure 9.
• FIG. 12 is a schematic view of a support leg for cooperating with the base of the loading / unloading tower.
• FIG. 13 is a schematic illustration of temporary support means providing support for the loading / unloading tower on the bottom wall of the supporting structure.
• FIG. 14 is a schematic illustration of temporary support means providing support for the loading / unloading tower on insulating elements of the secondary thermally insulating barrier which are anchored against the lower wall of the supporting structure.
• FIGS. 15 and 16 illustrate a sequence of assembly of the wall of the tank at the level of the liquid dome according to one embodiment.
• the supporting structure 1 is formed by the double hull of a ship.
• the supporting structure 1 has a general polyhedral shape.
• the supporting structure 1 has two front walls 2 and rear 3, here octagonal.
• the front wall 2 is shown only partially so as to allow visualization of the internal space of the supporting structure 1.
• the front and rear walls 3 and 3 are cofferdam walls of the ship and extend transversely. to the longitudinal direction of the ship.
• the supporting structure 1 also comprises an upper wall 4, a bottom wall 5 and side walls 6, 7, 8, 9, 10, 11.
• the upper wall 4, the bottom wall 5 and the side walls 6, 7, 8, 9, 10, 1 1 extend in the longitudinal direction of the ship and connect the front walls 2 and rear 3.
• the upper wall 4 comprises, close to the rear wall 3 of the supporting structure 1, a rectangular parallelepiped-shaped space, projecting upwards, called the liquid dome 12.
• the liquid dome 12 is defined by two transverse walls, before 13 and rear 14, and two side walls 15, 16 which extend vertically and project from the upper wall 4 upwards.
• the liquid dome 12 further comprises a horizontal cover, not shown in Figure 1, which is intended to cover sealing the opening formed between the front walls 13, rear 14 and side 15, 16 of the liquid dome 12.
• the tank whose assembly process will be described later is a membrane tank having a multilayer structure.
• each wall of the tank has successively, from the outside towards the inside, in the direction of thickness of the wall, a secondary heat-insulating barrier 17 comprising insulating elements resting against the carrier structure 1, a secondary sealing membrane 18 anchored to the insulating elements of the secondary heat-insulating barrier 17, a primary heat-insulating barrier 19 having insulating elements resting against the secondary sealing membrane 17 and a primary sealing membrane 20 anchored to the insulating elements of the primary thermally insulating barrier 19 and intended to be in contact with the fluid contained in the tank.
• This multilayer structure of the tank is disposed on each of the walls 4, 5, 6, 7, 8, 9, This multilayer structure is also present on the walls of the liquid dome 12, except where the level of the cover where it is likely to be different.
• each wall of the vessel may in particular be of the Mark III type, as described for example in FR2691520, of the N096 type as described for example in FR2877638, or of the Mark V type as described, for example, in W014057221. .
• Each wall of the tank is anchored to the respective wall of the supporting structure 1, proceeding from the outside to the inside of the tank, that is to say:
• the tank comprises a loading / unloading tower 21, illustrated in Figure 3, in particular to load the cargo in the tank before transport and / or unload the cargo after transport.
• the loading / unloading tower 21 is installed in the vicinity of the rear wall 3 of the support structure 1, since during the unloading of the cargo, the ship leans backwards, which makes it possible to optimize the quantity of cargo likely to to be unloaded by the loading / unloading tower 21.
• the loading / unloading tower 21 is suspended from the upper wall 4 of the supporting structure 1 and more particularly to the lid of the liquid dome 12.
• the loading / loading tower 21 extends over substantially the entire height of the tank.
• the loading / loading tower 21 supports, at its lower end, one or more unloading pumps of the cargo.
• the base of the loading / unloading tower 21 cooperates with a support leg 36, illustrated in FIG. 12, which is fixed to the bottom wall 5 of the supporting structure 1 and which aims at ensuring a vertical retention of the tower loading / unloading 21.
• the support foot 36 protrudes inside the tank and passes through the primary thermally insulating barriers 19 and secondary 17 and the primary 20 and secondary 18 primary sealing membranes of the bottom wall of the tank.
• Such a support foot 36 is for example described in the applications FR3035475 and WO201 1 157915.
• the loading / unloading tower 21 comprises a tripod structure, that is to say that it comprises three vertical poles 22, 23, 24 which are each attached to each other. 25.
• Each of the masts 22, 23, 24 is hollow and passes through the lid of the liquid dome 12.
• Each of the masts 22, 23, 24 thus forms either a loading and / or unloading line for loading or unloading. discharge fluid to or from the tank; either a relief well allowing the descent of an emergency pump and an unloading line in case of failure of the other unloading pumps.
• two of the masts 22, 23 form an unloading line of the tank and are, for this purpose, each associated with an unloading pump 26, 27 attached to the lower end of the loading tower.
• unloading 21 while the third mast 25 forms a relief well.
• the loading / unloading tower 21 carries one or more loading lines, not shown, which do not constitute one of the poles 22, 23, 24 of the tripod structure.
• the loading / unloading tower 21 is lowered inside the supporting structure 1 before all the walls of the tank are assembled and fixed to the supporting structure 1, and in particular before the primary waterproofing membrane of the rear wall is assembled and anchored on the rear wall 3 of the supporting structure 1.
• FIGS 4 and 5 schematically illustrate the tripod structure of the masts 22, 23, 24 of the loading / unloading tower 21 in two different arrangements with respect to the rear wall 3 of the supporting structure 1.
• the three masts 22, 23, 24 extend vertically.
• the central axes of the three masts 22, 23, 24 define, in projection in a horizontal plane, the vertices ABC of a triangle.
• the three poles 22, 23, 24 are arranged equidistant from each other so that the triangle ABC is an equilateral triangle.
• the AC side of the triangle that is closest to the rear wall 3 of the supporting structure 1 is parallel to said rear wall 3.
• two vertices A and C of the triangle are placed at an equal distance from the rear wall 3 of the supporting structure 1.
• the orientation of the triangle ABC, defined by the central axis of the masts 22, 23, 24 of the loading / unloading tower 21, relative to the rear wall 3 of the supporting structure 1 is optimized in order to facilitate access to the areas of the rear wall 3 located behind the loading / unloading tower 21.
• such an arrangement is advantageous in that it facilitates the mounting of the wall of the tank against the rear wall 3 of the structure carrier 1 while the loading / unloading tower 21 is already present inside the carrier structure 1.
• the triangle ABC is oriented such that one of the vertices A of the triangle defined by the central axes of the three poles 23, 24, 25 is placed closer to the rear wall 3 than are the two other vertices B and C of the triangle.
• the bisector 28 of the angle BAC of the triangle which is defined by the two sides of the triangle BA and AC joining at the apex A closest to the rear wall 3, forms with said wall rear angle an angle between 45 ° and 135 °, preferably between 70 ° and 1 10 °, and preferably of the order of 90 °.
• the distance L is preferably greater than 0.80 meters, preferably greater than 1 meter and preferably greater than or equal to 1.50 meters.
• the distance L between the tower of loading / unloading 21 and the destination location of the primary sealing membrane 21 of the rear wall is advantageously less than 10 meters, advantageously less than 5 meters and preferably less than 3 meters.
• the lower end of the loading / unloading tower 21 is disposed at a vertical distance greater than 0.4 m and preferably greater than 0.5 m from the destination location of the primary sealing membrane of the lower wall of the vessel.
• Figures 6 and 7 show in detail the liquid dome 12 and the upper part of a loading / unloading tower 21 according to two embodiments.
• the liquid dome 12 is shifted towards the front of the vessel with respect to the rear wall 3 of the supporting structure 1.
• the rear wall 14 of the liquid dome 12 does not extend in the same horizontal plane as the rear wall 3 of the supporting structure 1, that is to say in its extension, and is positioned towards the front of the ship relative to the rear wall 3.
• the upper wall 4 of the supporting structure 1 comprises a horizontal portion 29 which connects the rear wall 3 of the supporting structure 1 to the rear wall 14 of the liquid dome 12.
• the rear wall 14 of the liquid dome 12 extends in the extension of the rear wall 3 of the supporting structure 1 and the length of the liquid dome 12 along the axis longitudinal axis of the ship is dimensioned accordingly, that is to say, so that the loading / unloading tower 21 can be arranged at a distance of the rear wall 3 of the supporting structure 1 sufficient to allow the assembly of the rear wall of the tank.
• the loading / unloading tower 21 is placed at a distance from the destination location of the primary sealing membrane intended to cover the rear wall 14 of the liquid dome which is preferably greater than 0.80 meters, preferably greater than 1 meter and preferably greater than or equal to 1.50 meters.
• Figures 8 to 1 1 illustrate a scaffold 30 for use in assembling the vessel.
• the scaffold 30 includes a support frame 31 and a plurality of platforms 32a, 32b, 32c which are attached to the support frame 31.
• the platforms 32a, 32b, 32c are regularly spaced in the vertical direction and allow operators to access the different areas of the supporting structure 1 to anchor the vessel walls.
• the platforms 32a, 32b, 32c are associated with each other by at least one staircase 42 allowing operators to move from one platform 32a, 32b, 32c to another.
• each of the platforms 32a, 32b, 32c has an opening 34 formed near the rear wall 3 of the supporting structure 1.
• the openings 34 are arranged one below the other, below the liquid dome 12 formed in the upper wall 4 of the supporting structure 1.
• the openings 12 thus define a vertical passage which allows the loading / unloading tower 21 to pass through the platforms 32a, 32b, 32c.
• each of the platforms 32a, 32b, 32c is equipped with a bridge 33 which is disposed between the opening 34 and the rear wall 3 of the supporting structure 1 and which thus closes the contour of one of the openings 34.
• the gangways 33 are removably attached to the platforms 32a, 32b, 32c and can be removed as shown in particular in FIGS. 8 and 10, for example to facilitate the descent of the loading / unloading tower 21 inside the supporting structure 1.
• Such bridges 33 allow access to the areas of the support structure 1 located behind the loading / unloading tower 21 when the loading / unloading tower 21 is at the interior of the carrier structure 1 and extends through the openings 34 formed in the platforms 32a, 32b, 32c.
• the platforms 32a, 32b, 32c are devoid of gateways 33 as described below.
• the scaffold 30 then comprises one or more elevators able to move vertically through the portion of the openings 34 adjacent to the rear wall 3 of the supporting structure 1.
• an elevator is able to move between the loading / unloading tower 21 and the rear wall 3 of the supporting structure 1 when said loading / unloading tower 21 extends inside the supporting structure 1, this which allows the operators to access the areas of the supporting structure 1 located behind the loading / unloading tower 21.
• the support frame 31 of the scaffold 30 has a plurality of legs 35.
• the legs 35 are vertically retractable feet.
• the feet 35 are able to be placed in abutment against the bottom wall 5 of the supporting structure 1, during the assembly of the scaffolding 30 inside the supporting structure 1, and then to be placed in abutment against the thermal barriers.
• secondary insulation 17 and primary 19 and against the secondary waterproofing membranes 18 and primary 20 as and when they are assembled and anchored against the bottom wall 5 of the supporting structure 1.
• the feet 35 are retractable over a length greater than or equal to the thickness of the multilayer structure of the bottom wall of the vessel.
• the lower platform 32a of the scaffold 30 is disposed at a vertical distance from the bottom wall 5 of the supporting structure 1 which is greater than the thickness of the multilayer structure of the bottom wall of the vessel.
• the positioning and the number of feet 35 are determined so that the pressure due to the weight of the scaffolding remains less than 2 bars at each of the feet 35, which makes it possible to avoid the deformations of the secondary thermally insulating barriers. 17 and primary 19 and secondary waterproofing membranes 18 and primary 20.
• each of the platforms 32a, 32b, 32c are retractable, for example horizontally, and are thus suitable for retract as the assembly of the vessel wall on the wall of the supporting structure 1 facing.
• the edge of the bridges 33 is also retractable.
• the scaffold 30 is mounted inside the carrier structure 1 before the anchoring of any of the vessel walls to the carrier structure 1 begins.
• a support leg 36 is then assembled and fixed against the bottom wall 5 of the supporting structure 1.
• the loading / unloading tower 21 is lowered inside the supporting structure while the lid of the liquid dome 12 is not installed.
• the loading / unloading tower 21 is introduced through the opening formed between the front 13, rear 14 and side 15, 16 walls of the liquid dome 12.
• the loading / unloading tower 21 is then lowered inside. of the supporting structure 1 through the openings 24 formed in the platforms 32a, 32b, 32c of the scaffold 30.
• the base of the loading / unloading tower 21 is guided by the support foot 36 so that said support leg 36 ensures precise positioning of the loading / unloading tower 21 and holding in vertical position.
• the loading / unloading tower 21 is then supported on the lower wall of the support structure by temporary support means 38, shown schematically in FIG. 13.
• the temporary support means 38 are advantageously provided with lifting means, such as cylinders, to adjust the vertical position of the loading / unloading tower 21.
• the unloading / unloading tower 21 is lowered inside the supporting structure 1 before the secondary heat-insulating barrier 17 is anchored to the bottom wall 5 of the supporting structure 1 in the area facing said loading / unloading tower 21. Also, in such a case, the support means provisional 38 rest directly against the bottom wall 5 of the supporting structure 1.
• the secondary thermally insulating barrier is anchored to the bottom wall 5 of the supporting structure 1, at least in the area facing the loading / unloading tower 21. Also, in this variant embodiment, the temporary support means 38 rest against insulating elements of the secondary thermally insulating barrier 17 which are anchored against the bottom wall 5 of the supporting structure 1.
• the lid of the liquid dome 12 is attached and welded to the front 13, rear 14 and side walls 15, 16 of the liquid dome 12 so as to cover the opening formed therebetween.
• the loading / unloading tower 21 can then be suspended on the lid, the masts 22, 23, 24 of the loading / unloading tower 21 passing through orifices in said lid. Temporary support means 38 can then be removed.
• the ventilation of the The internal space of the tank is carried out through one or more of the masts 22, 23, 24 hollow of the loading / unloading tower 21 which then serve as a ventilation duct.
• the assembly and anchoring of at least a portion of the multilayer structure of at least one wall of the tank are advantageously carried out in parallel with the above-mentioned operations of welding the lid of the liquid dome 12 and fixing the loading tower.
• this is compared with the assembly methods of the state of the art in which the loading / unloading tower 21 had not descended inside the supporting structure 1 and attached thereto after the anchoring of all the walls of the tank, such an assembly method reduces the assembly time of the tank.
• At least the primary sealing membrane of the rear wall of the tank and preferably the entire multilayer structure of the rear wall of the tank are mounted and anchored on the rear wall 3 of the supporting structure 1 after the operation of descent of the loading / unloading tower 21 inside the supporting structure 1.
• This is made possible in particular by the presence of the bridges 33 which are arranged between the rear wall 3 of the supporting structure 1 and the tower loading / unloading 21 when said loading / unloading tower 21 extends inside the carrier structure 1.
• the scaffold 30 can then be dismantled.
• a portion 40 of the upper wall of the tank having insulating elements and optionally one or more sealing membranes are fixed in a central portion of the lid 39.
• a peripheral portion 41 of the lid 39 is extending around the portion of the wall 40 of the upper wall is not coated with insulating elements.
• transverse walls 13, 14 and lateral 15, 16 of the liquid dome 12 as well as advantageously the remainder of the upper wall 4 and the rear wall 3 are coated with a multilayer tank wall structure.
• the anchoring of the multilayer structure in part or all of these areas of the support structure is advantageously performed at the same time as the anchoring of the portion 40 of the upper wall of the tank which is fixed against the central portion of the cover 39.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)

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Citations (9)

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• 2018
  • 2018-05-11 FR FR1853995A patent/FR3081041B1/fr active Active
• 2019
  • 2019-05-07 KR KR1020207035185A patent/KR102655964B1/ko active IP Right Grant
  • 2019-05-07 JP JP2020563597A patent/JP7322066B2/ja active Active
  • 2019-05-07 EP EP19730195.5A patent/EP3791107A1/fr not_active Withdrawn
  • 2019-05-07 CN CN201980031789.8A patent/CN112105864B/zh active Active
  • 2019-05-07 WO PCT/FR2019/051042 patent/WO2019215414A1/fr active Application Filing
  • 2019-05-07 SG SG11202011192UA patent/SG11202011192UA/en unknown

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