Filter box, and recoverable underwater filter module with filter box.

Abstract

The present invention relates to a subsea filter box comprising a plurality of pressure vessels 1 forming at least one group of vertical pressure vessels. A first support plate 7 and a second support plate 8 include a plurality of fastening features 20, each supporting a pressure vessel end section 17, 6. Each of the plurality of pressure vessels extends between a fastener on the first support plate and a fastener on the second support plate. Each group of pressure vessels includes at least one inlet pressure vessel, one end pressure vessel 14 adjacent and in fluid connection with an intermediate pressure vessel 16, and a filter box frame clamping the first support plate 7 and the second support plate 8 to the plurality of pressure vessels. A filter module comprising at least one filter box is also disclosed.

Description

Technical Field

[0001] The present invention relates to a subsea filter box and a recoverable subsea filter module provided with the subsea filter box. In particular, the subsea filter module is adapted to be used with a subsea template having a zone dedicated to the subsea filter module.

Background Art

[0002] The subsea filter box and the recoverable subsea filter module are particularly intended for use in relation to desalination that uses an RO membrane and hydrostatic pressure to fully or partially pressurize seawater through the RO membrane.

[0003] When a pressure vessel equipped with a membrane is used underwater, the pressure difference between the inside and outside of the pressure vessel decreases, so the required pressure rating of the pressure vessel also decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In filtration, space can be a problem, and an object of the present invention is to provide a more compact stacking of pressure vessels equipped with membranes than conventional solutions. A compact stacking is particularly useful when using pressure vessels equipped with membranes in underwater modules, which may have limited space and usually require large support vessels to install or recover large templates and modules, so high space requirements increase costs for both production and installation.

[0005] Reverse osmosis (RO) membranes can be placed in seawater at a water depth that provides a hydrostatic pressure greater than the osmotic pressure (π). Utilizing a hydrostatic pressure greater than π in the desalination process allows water molecules to be pushed through the RO membrane without the need for additional pressure. Subsea desalination is advantageous because a pump that provides the flow through the RO membrane can be placed downstream of the RO membrane, and thus only the flow of desalinated water rather than the entire flow of seawater can be pumped.

[0006] A typical pressure vessel for RO membranes has an outlet for the permeate in the center of one of the short sides opposite the inlet. Such a location requires access to the end of the pressure vessel, and this access imposes special requirements on the stacking of the pressure vessels. One of the objectives of the present invention is to eliminate this limitation and provide greater flexibility in the stacking of pressure vessels. Furthermore, the underwater filter box of the present invention offers a compact structure, which is suitable for use in underwater modules and can form the basis for many pressure vessel and underwater filter box configurations. [Means for solving the problem]

[0007] The present invention relates to an underwater filter box comprising a plurality of vertical pressure vessels forming at least one group of vertical pressure vessels. Each pressure vessel includes a membrane, a first end section, and a second end section. Each first end section includes a first side and a first end section end face. Each second end section includes a second side and a second end section end face. The first end section end face faces away from the second end section end face. At least one feed inlet is located on the side of the first end section, and at least one retaining fluid outlet and at least one permeate / filtrate outlet are located on the side of the second end section. The submerged filter box comprises a first support plate having a plurality of fixed shapes, each supporting a first end section, and a second support plate having a plurality of fixed shapes, each supporting a second end section, so that each of the plurality of pressure vessels extends between the fixed shapes on the first support plate and the fixed shapes on the second support plate. At least one group of pressure vessels includes at least one inlet pressure vessel having at least one feed inlet on the side of the first end section, at least one intermediate pressure vessel having at least one feed inlet on the side of the first end section, at least one permeate inlet on the side of the second end section, and at least one retaining fluid inlet on the side of the second end section, adjacent to the inlet pressure vessel and liquid-connected. One end pressure vessel is liquid-connected adjacent to the intermediate pressure vessel. The clamping structure clamps the first support plate and the second support plate to multiple pressure vessels. The inlet pressure vessel can be a 5-port pressure vessel, the end pressure vessel can be a 4-port pressure vessel, and the intermediate pressure vessel can be a 6-port pressure vessel.

[0008] The inlet pressure vessel may further include a permeate / filtrate outlet on the side of the second end section, and the end pressure vessel may include a retaining fluid inlet on the side of the second end section.

[0009] The supply fluid inlet, retaining fluid outlet, and permeate / filtrate outlet of a pressure vessel can be fixed to the supply fluid outlet, retaining fluid inlet, and permeate inlet of an adjacent pressure vessel, respectively, using a releasable liquid coupling.

[0010] A releasable fluid coupling provides a mechanical joint that offers a robust connection, allowing pressure vessels to be mechanically secured to one another within a group of vertical pressure vessels.

[0011] Each pressure vessel may include a permeate end cap that seals the permeate side of the pressure vessel. The permeate end cap may include a permeate channel, which is fixed to the threaded portion of the permeate / filtrate outlet tube of the pressure vessel using an end cap mounting bracket formed as a tube with a female thread that is threaded into the permeate / filtrate outlet tube and a port on the side, allowing the permeate to flow out of the tube and holding the end cap to the permeate / filtrate outlet tube.

[0012] The end face of the first end section can be parallel to the end face of the second end section.

[0013] The membrane can be a reverse osmosis (RO) membrane, and the underwater filter box can be adapted for use in underwater desalination, where the feed liquid is seawater, the retaining liquid is brine, and the permeate is freshwater.

[0014] Furthermore, the present invention relates to a recoverable submarine filter module comprising at least one of the above-described filter boxes, comprising a plurality of groups of vertical pressure vessels, each comprising a supply fluid inlet header liquid-connected to each supply fluid inlet of each inlet pressure vessel. A retaining fluid header liquid-connected to each retaining fluid outlet of one of the inlet pressure vessels or each end pressure vessel. A permeate header liquid-connected to each permeate / filtrate outlet of one of the inlet pressure vessels or each end pressure vessel.

[0015] The underwater filter module may include two filter boxes, the first of which is positioned on top of the second of which, so that the longitudinal centerlines of each pressure vessel of the first filter box coincide with the longitudinal centerlines of the pressure vessel of the second filter box.

[0016] A recoverable underwater filter module may further include an underwater desalination template with a recoverable underwater filter module zone, a retaining fluid outlet pipe extending from the desalination module, and a permeate service line extending from the desalination template to a permeate receiving facility.

[0017] Furthermore, the present invention relates to a vertical pressure vessel equipped with a membrane. The first end section includes a first side surface and an end face of the first end section. The second end section includes a second side surface and an end face of the second end section. The end face of the first end section faces away from the end face of the second end section. At least one feed inlet is located on the side surface of the first end section. At least one retaining fluid outlet and at least one permeate / filtrate outlet are located on the side surface of the second end section. At least one of the feed inlets is located on the side surface of the first end section, the retaining fluid inlet is located on the side surface of the second end section, and the permeate inlet is located on the side surface of the second end section.

[0018] The membrane can be an RO membrane, and the pressure vessel can be a desalination pressure vessel. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view of the filter box according to the present invention. [Figure 2] This is a perspective view of the bottom support plate. [Figure 3] Figure 2 is a top view of the bottom support plate. [Figure 4] Figure 3 is a cross-sectional view AA of the bottom support plate. [Figure 5] This is a side view of a pressure vessel. [Figure 6] This is a cross-sectional view of the bottom section of a pressure vessel. [Figure 7] This is a cross-sectional view of the first section / upper section of the pressure vessel. [Figure 8a]Schematic diagrams of different embodiments of a row of six pressure vessels. [Figure 8b] Schematic diagrams of different embodiments of a row of six pressure vessels. [Figure 8c] Schematic diagrams of different embodiments of a row of six pressure vessels. [Figure 9] Perspective view of a recoverable filter box module in the sea according to the present invention, with two filter boxes as shown in FIG. 1. [Figure 10] Side view of the recoverable filter box module of FIG. 9 as seen from the first side. [Figure 11] Side view of the recoverable filter box module of FIG. 9 as seen from the second side. [Figure 12] Schematic diagram of a seawater desalination template equipped with the recoverable filter box module of the present invention.

Mode for Carrying Out the Invention

[0020] A detailed description of an embodiment of the present invention will first refer to the accompanying drawings.

[0021] FIG. 1 is a perspective view of a filter box according to the present invention. The filter box includes a number of pressure vessels 1. The pressure vessels 1 are shown in six rows, with each row having 10 pressure vessels 1, for a total of 60 pressure vessels 1, and each generating 10 columns of 6 pressure vessels 1. Each pressure vessel includes a liquid inlet 2 in the first section of the pressure vessel or the upper section 17 of the pressure vessel, and a holding liquid outlet 3 and a permeate / filtrate outlet 4 in the second section / bottom section 6 of the pressure vessel. The central section 5 of the pressure vessel connects the bottom section 6 of the pressure vessel and the upper section 17 of the pressure vessel and holds the RO membrane.

[0022] Each of the 10 rows includes four 6-port intermediate pressure vessels 16, one 4-port end pressure vessel 14 at the end of the first row, and one 5-port inlet pressure vessel 15 at the end of the second row. The 5-port inlet pressure vessel 15 provides an inlet port for liquid. The pressure vessels 1 within a row are liquid-connected to each other, allowing for the flow of liquid between the pressure vessels 1 and mechanically coupling the pressure vessels to hold them together within each row. The feed liquid is typically seawater, permeate (desalinated water), and brine (high-salinity seawater). In addition to the three ports listed above, the 4-port pressure vessel 14 includes a retaining liquid inlet. In addition to the three ports listed above, the 5-port pressure vessel 15 includes a liquid outlet and a permeate inlet. In addition to the three ports listed above, the 6-port pressure vessel 16 includes a retaining fluid inlet, a liquid outlet, and a permeate inlet.

[0023] The pressure vessel 1 is held in a predetermined position between a first support plate / upper support plate 7 and a second support plate / bottom support plate 8, both of which have circular recesses that form fixed shapes for each pressure vessel 1. The first support plate / upper support plate 7 and the second support plate / bottom support plate 8 are clamped to each other by a clamp structure. The clamp structure may include an upper frame portion 9 that supports the upper support plate 7 and a lower frame portion 10 that supports the bottom support plate 8. Each of the upper frame portion 9 and the lower frame portion 10 is connected to two central frame portions 11 at four frame joints 12, also forming part of a clamp structure that clamps these parts to each other. The pressure vessel support clamp 13 holds the pressure vessels along the outer lines (a 4-port pressure vessel 14 on one central frame portion 11 and a 5-port pressure vessel 15 on the other central frame portion 11). The pressure vessel support clamp 13 is typically a clamp that surrounds the pressure vessel. Some of the pressure vessels include a retaining fluid inlet 33 and a permeate fluid inlet 34 for communicating liquids between the pressure vessels.

[0024] The embodiment shown in Figure 1 is also applicable to other systems such as sulfate removal, in which the supply flow entering inlet 2 is filtered by any type of filter cartridge located inside pressure vessel 1, resulting in a filtered liquid flow at outlet 4 and a retained liquid flow at outlet 3.

[0025] Figure 2 is a perspective view of the bottom support plate 8, which is similar to the upper support frame 7 shown in Figure 1. The bottom support plate 8 includes one circular recess or fixed shape portion 20 for each pressure vessel the support plate is intended to hold, in this case including 60 fixed shapes portion 20 in a pattern of 6 rows and 10 columns. The fixed shapes portion coincide with each other.

[0026] The fixed-shape portion 20 is a shaped portion that prevents lateral and vertical displacement of the pressure vessel. The fixed-shape portion is adapted to the shape and size of the end of the pressure vessel.

[0027] Figures 3 and 4 include approximate dimensions to show the order of magnitude of the support plate size.

[0028] Figure 3 is a top view of the bottom support plate 8 as shown in Figure 2. The distance c between each of the fixed-shape portions 20, which are formed as circular recesses, is typically 36 cm. The width w of the plate is typically 230 cm, and the length l of the plate is typically 370 cm.

[0029] Figure 4 is a cross-sectional view AA of the bottom support plate 8 as shown in Figure 3, showing that the diameter D of the fixed shape portion 20 is 30 cm, and the diameter d of the hole that penetrates the support plate at the center of each recess is 3 cm. The thickness t of the support plate is 13 cm, and the depth h of each recess is 6 cm.

[0030] Figure 5 is a side view of a pressure vessel equipped with a liquid inlet 2, a retaining liquid outlet 3, a permeate / filtrate outlet 4, a supply liquid outlet 32, a retaining liquid inlet 33, and a permeate inlet 34. An upper plug 35 provides access to the liquid inlet chamber of the pressure vessel. A permeate end cap 30 seals the permeate side of the pressure vessel and includes a permeate channel. The pressure vessel comprises a first end section (upper) 17 and a second end section (bottom) 6.

[0031] Figure 6 is a cross-sectional view of the bottom section 6 of the pressure vessel. A retaining fluid outlet 3, a retaining fluid inlet 33, a permeate / filtrate outlet 4, and a permeate inlet 34 are shown. The permeate end cap 30, which seals the permeate side of the pressure vessel, includes a permeate channel 31 that extends from the base as a perforated hollow channel to guide the flow from the inlet and outlet. The permeate end cap 30 includes a second / bottom pressure vessel end section end face 22 and a second / bottom pressure vessel end section side face 24. The end section 30 is fixed to the threaded portion of the permeate / filtrate outlet tube 38 of the pressure vessel using an end cap mounting bracket 36 formed as a tube with a female thread that is threaded into the permeate / filtrate outlet tube 38 and a port on the side, allowing permeate to flow out of the tube. A gasket or seal 37 seals between the end section 30 and the end face of the pressure vessel. The end cap mounting bracket 36 holds the end cap 30 to the pressure vessel. The end cap 30 includes a tool mounting portion 25, such as a recess for receiving a hex key / Allen key or Torx key.

[0032] Figure 7 is a cross-sectional view of the first section / upper section 17 of the pressure vessel. The supply fluid inlet 2 and supply fluid outlet 32 ​​are shown. The upper plug 35 allows access to the supply fluid inlet chamber of the pressure vessel. The end face 21 of the first / upper pressure vessel end section and the side face 23 of the first / upper pressure vessel end section are shown.

[0033] In the 4-port pressure vessel 14 described in relation to Figure 1, the supply liquid outlet 32 ​​and the permeate inlet 34 are either blocked or omitted.

[0034] In the 5-port pressure vessel 15 described in relation to Figure 1, the retaining fluid inlet 33 is either omitted or blocked.

[0035] Figures 8a, 8b, and 8c are schematic diagrams of a row of six pressure vessels 1. The figures show different embodiments with slightly different outlet configurations. In Figure 8a, the pressure vessels include four 6-port intermediate pressure vessels 16, a 4-port end pressure vessel 14 at the end of the first row, and a 5-port inlet pressure vessel 15 at the end of the second row. The pressure vessels 1 in each row are liquidally connected to one another by releasable liquid couplings 18, which allow the flow of seawater, permeate (desalinated water), and brine (high-salinity seawater) between the pressure vessels 1 (when the pressure vessels are used for desalination), while also mechanically joining the pressure vessels 1 and holding the pressure vessels 1 in each row together. Releasable liquid couplings 18 are provided at the ports, including each of the feed liquid inlets 2, the retaining liquid outlet 3, and the permeate / filtrate outlet 4. In addition to the three ports listed above, the 4-port pressure vessel 14 includes a retaining liquid inlet 33. In addition to the three ports listed above, the 5-port pressure vessel 15 includes a supply fluid outlet 32 ​​and a permeate inlet 34. In addition to the three ports listed above, the 6-port pressure vessel 16 includes a retaining fluid inlet 33, a supply fluid outlet 32, and a permeate inlet 34.

[0036] The releasable liquid coupling 18 can be formed as a clamp connector / connecting clamp or as a threaded connector. Suitable couplings are sold as Victaulic couplings, where Victaulic is a trademark name. Permeate end caps 30 are located at the bottom of each of the pressure vessels 1.

[0037] The only difference between the six pressure vessels is the number of ports. All pressure vessels have the same dimensions.

[0038] Figure 8b shows a different embodiment in which the inlet pressure vessel 15 includes six ports, including a permeate / filtrate outlet 4, a retaining fluid outlet 3, a permeate inlet 34, and a retaining fluid inlet 33. The end pressure vessel 14 includes only three ports and therefore does not include a retaining fluid inlet or a permeate inlet.

[0039] Figure 8c shows a different embodiment in which the inlet pressure vessel 15 includes four ports, including a feed outlet 32, a permeate / filtrate outlet 4, and a retaining fluid outlet 3, but does not include a permeate inlet or retaining fluid inlet. The end pressure vessel 14 includes five ports, so it includes both retaining fluid and permeate inlets (permeate inlet 34 and retaining fluid inlet 33) and outlets.

[0040] Figure 9 is a perspective view of a filter box module according to the present invention, which has two filter boxes (with 14 rows of pressure vessels instead of 10) stacked vertically, as shown in Figure 1. The pressure vessels 1 are shown in six rows, with 14 pressure vessels 1 in each row, for a total of 168 pressure vessels 1. Each of the 14 rows of pressure vessels 1 is supplied with feed fluid through two inlet filters 40, which are liquid-connected to one feed fluid header 42 per layer of the filter box. In Figure 9, there are two layers of filter boxes, and therefore two feed fluid headers 42. Each feed fluid header 42 includes a plenum tube and one inlet tube, which is liquid-connected to a feed fluid inlet 2 per row of pressure vessels.

[0041] The permeate from each of the 10 rows of pressure vessel 1 is led to one permeate header 44 for each layer of the filter box. In Figure 9, there are two layers of filter boxes and therefore two permeate headers 44. Each permeate header 44 includes a plenum tube and one outlet tube liquid-connected to a permeate / filtrate outlet 4 for each row of pressure vessel.

[0042] Brine from each of the 10 rows of pressure vessel 1 is led to one retaining fluid header 43 for each layer of filter boxes. In Figure 9, there are two layers of filter boxes and therefore two retaining fluid headers 43. Each retaining fluid header 43 includes a plenum tube and one inlet tube that is liquid-connected to a retaining fluid outlet for each row of pressure vessel.

[0043] The pressure vessel 1 is held in a predetermined position between the first support plate / upper support plate 7 and the second support plate / bottom support plate 8. The upper support plate 7 and the bottom support plate 8 are located within the upper frame portion 9 and the lower frame portion 10 of the respective filter boxes.

[0044] The permeate template connection section 45 and the retaining liquid template connection section 46 are in liquid contact with the permeate header 44 and the retaining liquid header 43, respectively. The template connection sections 45 and 46 are connected to the desalination template when the filter box module is installed in the seawater desalination template.

[0045] The embodiment shown in Figure 9 is also applicable to other systems in which the flow of supply seawater passing through the seawater inlet filter 40 is filtered by any type of filter cartridge located inside the pressure vessel 1, the flow of filtered liquid exits from the template connection 45, and the retaining liquid exits from the outlet 46.

[0046] Figure 10 is a side view of the filter box module of Figure 9, viewed from the first side, and Figure 11 is a side view of the filter box module of Figure 9, viewed from the second side. Each of the filter boxes includes an upper plate 7, an upper frame 9, a bottom plate 8, and a bottom frame 10. Valves and liquid parameter sensors are located in the flow path between the retaining fluid header 43 and the retaining fluid template connector 46. Valves and liquid parameter sensors are located in the flow path between the permeate header 44 and the permeate template connector 45. The seawater header 42 is liquid-connected to the seawater inlet filter 40.

[0047] Liquid parameter sensors may include temperature sensors, salinity sensors, pressure sensors, mass flow sensors, and contamination sensors.

[0048] Figure 12 is a schematic diagram of a submarine desalination template 50 equipped with a recoverable filter module 51 of the present invention within a recoverable submarine filter module zone 57. The filter module 51 is installed or recovered from the desalination template by an auxiliary / service vessel 55. A retaining fluid outlet pipe 53 extends from the desalination module 50 to a location away from the feed fluid inlet of the filter module 51. A permeate service line 52 extends from the desalination template to a permeate receiving facility 54. A control station 56 can be connected to the submarine desalination template 50 and can provide power and control to the submarine desalination template 50. The submarine desalination template 50 can form part of a system with one or more circulation pumps for the feed fluid, a system with one or more transport pumps for the permeate, a system with a separate inlet filter, and a system for monitoring operation.

[0049] The underwater template 50 may include a dedicated zone for the filter module 51 of the present invention and may include connections for at least one of a permeate inlet, a retaining fluid inlet, and a supply fluid outlet.

[0050] The pressure vessel is an RO pressure vessel for water desalination. Other filtration pressure vessels can also be used in this invention.

[0051] The above explanation is based on the assumption of RO membranes installed inside pressure vessels for desalination purposes. However, other systems may use other types of membranes, and the terminology may differ. [Explanation of Symbols]

[0052] 1. Pressure vessel 2. Supply liquid inlet 3 Retentate outlet 4 Permeate / filtrate outlet 5. Central section of the pressure vessel 6. Second end section 7. First support plate 8. Second support plate 9. Upper frame section 10 Lower frame section 11. Central frame section 12 Frame joints 13 Pressure vessel support clamp 14. 4-port end pressure vessel 15 5-port inlet pressure vessel 16 6-port intermediate pressure vessel 17 First end section 18 Releasable liquid coupling 20 Fixed shape part / circular recess 21 End face of the first end section 22 End face of second end section 23 Side view of the first end section 24 Side view of the second end section 25 Tool mounting section 30 Permeate end cap 31 Permeable Channels 32 Feed liquid outlet 33 Retentate inlet 34 Permeate inlet 35 Upper plug 36 End cap mounting bracket 37 End cap seal 38 Permeate / Filtrate Outlet Tube 40. Supply fluid inlet filter 42 Supply fluid header 43 Retention fluid header 44 Permeate Header 45 Permeation solution template connection 46. ​​Retention solution template connection 50 Desalination Templates 51 Filter Modules 52 Permeable Solution Service Line 53 Retaining fluid outlet pipe 54 Permeate receiving equipment 55 support ships 56 Control Station 57 Recoverable underwater filter module zones

Claims

1. A recoverable underwater filter module (51), A recoverable underwater filter box comprising a plurality of vertical pressure vessels (1) forming at least one group of vertical pressure vessels, Each pressure vessel (1) has a membrane, a first end section (17) that forms the upper section, and a second end section (6) that forms the bottom section. Each first end section (17) has a first side surface (23) and a first end section end face (21), Each second end section (6) has a second side surface (24) and a second end section end face (22), The end face (21) of the first end section faces away from the end face (22) of the second end section. Each pressure vessel (1) is The first end section side (23) has at least one seawater inlet (2), The side surface (24) of the second end section has at least one brine outlet (3) and at least one freshwater / filtrate outlet (4) Equipped with, The aforementioned membrane is a reverse osmosis (RO) membrane. The aforementioned underwater filter box is suitable for use in seawater desalination. The aforementioned underwater filter box is A first support plate (7) having a plurality of fixed-shaped parts (20) each supporting a first end section (17), A second support plate (8) having a plurality of fixed-shaped parts (20) each supporting the second end section (6) and The system is equipped with such that each of the plurality of pressure vessels extends between the fixed-shaped portion (20) on the first support plate (7) and the fixed-shaped portion (20) on the second support plate (8). At least one group of the pressure vessels is at least, One inlet pressure vessel (15) having at least one seawater outlet (32) on the side surface (23) of the first end section, The first end section side (23) has at least one intermediate pressure vessel (16) with at least one seawater outlet (32), The side surface (24) of the second end section has at least one freshwater inlet (34), The side surface (24) of the second end section has at least one brine inlet (33) adjacent to the inlet pressure vessel (15) and connected to the liquid, One end pressure vessel (14) is connected to the intermediate pressure vessel (16) via a liquid connection, A clamping structure for clamping the first support plate (7) and the second support plate (8) to the plurality of pressure vessels (1), Each seawater inlet (2) of each inlet pressure vessel (15) is connected to a seawater inlet header (42) with a liquid connection, A brine header (43) is liquid-connected to one of the brine outlets (3) of each inlet pressure vessel (15) or each end pressure vessel (14), A freshwater header (44) is liquid-connected to one of the freshwater / filter outlets (4) of each inlet pressure vessel (15) or each end pressure vessel (14) and A recoverable underwater filter module (51) is provided.

2. The recoverable underwater filter module (51) according to claim 1, wherein the inlet pressure vessel (15) is a five-port pressure vessel, the end pressure vessel (14) is a four-port pressure vessel, and the at least one intermediate pressure vessel (16) is a six-port pressure vessel.

3. The recoverable submarine filter module (51) according to claim 2, wherein the inlet pressure vessel (15) further has a freshwater inlet (34) on the side surface (24) of the second end section, and the end pressure vessel (14) has a brine inlet (33) on the side surface (24) of the second end section.

4. The recoverable submarine filter module (51) according to claim 1, wherein the seawater inlet (2), brine outlet (3), and freshwater / filtrate outlet (4) of a pressure vessel are fixed to the seawater outlet (32), brine inlet (33), and freshwater inlet (34) of an adjacent pressure vessel, respectively, using a releasable liquid coupling (18).

5. The releasable liquid coupling (18) provides a mechanical joint that provides a robust connection, mechanically securing the pressure vessels together within a group of vertical pressure vessels, according to claim 4, the recoverable submarine filter module (51).

6. Each pressure vessel is provided with a freshwater end cap (30) that seals the freshwater side of the pressure vessel (1), the freshwater end cap (30) having a freshwater channel (31), the freshwater channel (31) is fixed to the threaded portion of the freshwater / filter outlet tube (38) of the pressure vessel using an end cap mounting bracket (36) formed as a tube having a female thread that is screwed into the freshwater / filter outlet tube (38) and a port on its side, so that the freshwater can flow out of the tube, and the end cap (30) is held on the freshwater / filter outlet tube (38), according to any one of claims 1 to 5.

7. The recoverable underwater filter module (51) according to any one of claims 1 to 5, wherein the end face of the first end section can be parallel to the end face of the second end section.

8. A recoverable submersible filter module (51) according to any one of claims 1 to 5, comprising two submersible filter boxes, wherein the first of the two submersible filter boxes is positioned on top of the second of the two submersible filter boxes, so that the longitudinal centerlines of the pressure vessels of the first submersible filter box coincide with the longitudinal centerlines of the pressure vessels of the second submersible filter box.

9. A marine desalination template (50), A recoverable underwater filter module (51) according to any one of claims 1 to 5 is provided in a dedicated recoverable underwater desalination module zone (57) of the underwater desalination template (50), A brine outlet pipe (53) extends from the aforementioned seawater desalination template (50), A freshwater service line (52) extends from the aforementioned seawater desalination template to the freshwater receiving facility (54) and A further feature is the marine desalination template (50).

10. A vertical pressure vessel (1) for the recoverable underwater filter module (51) according to claim 1.

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