Containers for storing and transporting hazardous media, especially bromine

Abstract

The invention relates to a tank vessel with a manhole stub (2) and a dome cover (1) for closing said manhole stub (2), which is lined with lead for transporting a hazardous filling, for example bromine, the dome cover (1) and the manhole stub (2) having sealing surfaces (22, 23, 24) made of nickel, formed in particular by overlay welding, as well as to a conventional vessel retrofitted according to the invention and a method therefor.

Description

[Technical field]

[0001] The present invention relates to a container used for the transport as well as storage of hazardous materials, particularly bromine, and a dome cover for closing the container. [Background technology]

[0002] Bromine is highly toxic and highly corrosive and therefore belongs to the dangerous goods category, requiring special precautions during its transportation and storage.

[0003] Bromine is highly corrosive to many materials and can only be transported and stored in special containers due to the risk of decomposing these materials.

[0004] For example, it is known to store bromine in glass bottles or glazed containers. However, glass is fragile and therefore only suitable for storage and transportation in small quantities. Furthermore, glass bottles must be specially protected against breakage for transportation, which makes the transportation cumbersome and expensive.

[0005] Today, containers made of steel are used to transport bromine. These containers can have different volumes depending on the need. The inside walls of these containers, including the cover, are lined with lead, because otherwise the bromine would attack the container coating. Lead is highly chemically resistant due to passivation and is resistant to many corrosive substances, including bromine.

[0006] Chinese Utility Model No. 202017827 relates to a tank for electrically heated concentration, where it is proposed to additionally line the inside of the lines for the corrosive sulfate-containing electrolyte with ceramics, for example porcelain.

[0007] CN106809538 proposes replacing the inner conduit of a conventional bromine container, which is typically made from polytetrafluoroethylene, with a steel pipe whose inside wall is lined with lead.

[0008] DE 10 2012109015 A1 relates to a support structure for a conventional lead-lined bromine vessel, in which, inter alia, the cylindrical section of the vessel is supported as stress-free as possible, thereby preventing damage to the brittle passive layer of the lead coating which forms the actual corrosion barrier.

[0009] Containers, for example containers used for transportation, usually have so-called manholes, which allow personnel to access the interior for maintenance and repair. The manholes are connected to manhole stubs, also referred to simply as "tubes" in this specification. The manhole stubs extend beyond the container, similar to a chimney. The stubs and thus the container can be closed by means of a dome cover.

[0010] The dome cover also provides a support for equipment typically used to fill, empty and monitor the vessel.

[0011] For this purpose, the dome cover is usually provided with other openings for connecting the equipment attached to the dome cover to the inside of the container. For example, the dome cover may be provided with several valves, by means of which bromine can be injected and removed. One valve may be supplied with pressure so that bromine can escape from the container for removal via another valve. In addition, a safety valve may be provided, which opens in the event of an undesired pressure increase inside the container exceeding a critical value, thereby preventing an explosion of the container.

[0012] Although the vessel itself has a very long life, the seal between the dome cover and the manhole section, as well as the seal between the dome cover, the opening located in the dome cover and the valve, represent particularly dangerous areas.

[0013] Usually, for sealing purposes, the lead coating is continued in the area of ​​the sealing surfaces and flanges, in which case the vessel is coated with lead over its entire inner surface, including the inner surface of the dome cover and the sealing surfaces, e.g. the dome cover's resting surface on the tube piece and the valve on the dome cover.

[0014] During operation, the sealing surfaces are exposed to considerable pressing pressure so that they can fulfil their function.

[0015] This causes strong forces to act on the lead coating between the sealing surfaces. Since lead has only low hardness and is easily deformable under mechanical load, the lead coating between the sealing surfaces begins to creep over time. The lead escapes from the sealing area in both directions and forms a bump there. This bump is not a hindrance in itself, but the lead coating layer in the sealing area becomes thinner, so that the sealing effect is no longer guaranteed. This ultimately leads to containers that are still usable in themselves being rejected or having to be extensively reworked due to insufficient sealing of the lead coating on the sealing surfaces. Summary of the Invention [Problem to be solved by the invention]

[0016] The object of the present invention was to provide a solution which can easily and economically overcome the creep and thus the lack of sealing properties of conventional lead-lined vessels, including the dome cover.

[0017] In particular, it is desired that the solution is also suitable for retrofitting existing containers, for example containers that have been rejected due to a lack of sealing in the sealing area. [Means for solving the problem]

[0018] In accordance with the present invention, the aforementioned problems are solved by replacing the lead coating on the sealing surfaces of the vessel and dome cover with nickel sealing surfaces.

[0019] The principle according to the invention works equally well for small sealing surfaces, for example in valves, as for large sealing surfaces, for example in manholes or manhole pipe sections.

[0020] The sealing surfaces on the dome cover and manhole section usually have an annular disk shape and surround the entrance of the corresponding opening.

[0021] Nickel is not only sufficiently hard to withstand the resulting compressive loads, but is also resistant to bromine.

[0022] However, nickel is significantly more expensive than lead, so complete replacement of lead coatings with nickel is not preferred for cost reasons.

[0023] Therefore, according to the present invention, it is specified to replace the lead coating only partially, and particularly in the sealing areas that pose a risk, with a sealing surface made of nickel (also referred to in this specification as a "nickel sealing surface").

[0024] In the case of the dome cover, this applies on the upper side to the sealing surface for the valve or another structure, if provided, and on the lower side to the mounting surface of the dome cover on the tube piece or the fixing flange of the tube piece, and in the case of the tube piece to the corresponding corresponding surface on which the dome cover rests with its sealing surface.

[0025] One possibility to provide the required nickel sealing surface in the normally desired annular disk shape is to cut the annular disk shape to the desired size from a nickel sheet, however this leads to high cutting losses in the nickel sheet and thus correspondingly high costs.

[0026] The inventors have found that nickel can be deposited in sufficient quantities and in the desired shape in the relevant areas by overlay welding, using commercially available nickel wire.

[0027] In this way, the nickel sealing surfaces can be applied, so to speak, in a customised manner, in the areas provided for this purpose, with virtually no material loss.

[0028] A further advantage is that when the nickel sealing surface is produced by overlay welding, a full metallurgical bond is obtained between the nickel as the cladding material and the material of the underlying surface, for example the steel of the dome cover or manhole pipe section, whereas the bonding of the prefabricated nickel ring to the surface is effected by welding via a linear weld seam along the butt edges of the components to be bonded.

[0029] The sealing surfaces on the dome cover and the tube section are typically formed in the shape of an annular disk, as shown by way of example in the accompanying drawings.

[0030] However, it will be appreciated that the present invention is not limited to an annular disc shape and may have other shapes as required and depending on the application.

[0031] The solution according to the invention can be used not only for new constructions but also for retrofitting existing containers, so that the container can continue to be used, in which case the cover only needs to be replaced with a dome cover formed according to the invention.

[0032] For this purpose, a suitably dimensioned additional flange with a nickel sealing surface is applied to the tube piece or to the fixing flange provided at the upper end of the tube piece.

[0033] The application of the nickel sealing surface to the additional flange is preferably likewise effected by means of a weld overlay.

[0034] The solution according to the invention allows a dramatic improvement in the safety of the vessel during operation, the possibility of non-sealing due to lead creep is eliminated, repair costs are significantly reduced and thus the availability of the vessel is extremely increased.

[0035] The invention will now be described in greater detail, by way of example only, with reference to embodiments shown in the accompanying drawings. [Brief description of the drawings]

[0036] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of a dome cover placed on a manhole section, a valve structure provided on the dome cover, and a dome cover hood according to the prior art. [Diagram 2] 2 is a plan view of the dome cover shown in FIG. 1 and a valve structure provided in the dome cover. [Diagram 3] FIG. 3 is a longitudinal cross-sectional view of the relief valve shown in FIG. 2 including the corresponding dome cover section. [Figure 4] FIG. 2 is a longitudinal cross-sectional view of a dome cover without a coating and structure. [Diagram 5] FIG. 5 is a longitudinal cross-sectional view of FIG. 4 with a lead coating including a lead sealing surface according to the prior art. [Figure 6] FIG. 5 is a longitudinal cross-sectional view of FIG. 4 with a nickel sealing surface and a lead coating according to the present invention. [Figure 7] FIG. 7 shows a preliminary view of the dome cover shown in FIG. 6 with a nickel sealing surface. [Figure 8] FIG. 1 is a longitudinal cross-sectional view of a manhole section formed in accordance with the present invention. [Figure 9] FIG. 9 is a plan view of the manhole pipe section shown in FIG. 8. [Figure 10] FIG. 1 is a longitudinal cross-sectional view of the machined surface of a nickel sealing face. [Figure 11] FIG. 2 is a longitudinal section of a manhole end for a container according to the invention, closed with a dome cover according to the invention. [Figure 12]FIG. 1 is a longitudinal sectional view of a manhole section retrofitted with a make-up flange having a nickel sealing surface applied thereto in accordance with the present invention. [Figure 13] FIG. 1 shows a make-up flange with nickel sealing surface for retrofitting a conventional vessel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] The drawing corresponds, for example, to a tank vessel as is known for storing and transporting fillers in general, and in particular hazardous fillers.

[0038] Insofar as dimensional indications are provided in the drawings, the dimensional indications are meant to be exemplary only and may be altered as required and for the intended use.

[0039] In the drawings, the tank body is omitted. The tank body is connected to the lower opening of the manhole pipe piece through a manhole, forming one unit.

[0040] In FIG. 1 a dome cover 1 according to the prior art is shown.

[0041] The dome cover 1 is shown in a closed position resting on a manhole section 2 with valve structures 4,5,6. The dome cover 1, along with the valve structures 4,5,6, is covered by a dome cover hood 3 which is used to protect the valve structures 4,5,6.

[0042] In the longitudinal section shown in Figure 1 it is possible to see three valves 4, 5, 6, which are arranged in a line along the diameter of the dome cover 1. In the assembly shown in Figure 1, the middle valve 4 is used to load and unload the container, the left valve 5 is used to introduce a gas, usually dry air or nitrogen, to enable unloading, and the right valve 6 is used to vent air during loading.

[0043] A planar lead layer 8 is located on the underside of the dome cover 1. The edge area of ​​this lead layer 8 forms a sealing surface which is assigned to a sealing surface 10 on the manhole end 2 as a counter surface.

[0044] The sealing surface 10 on the manhole stub 2 is part of the lead coating 9 of the manhole stub. This lead coating 9 extends along the inner surface of the manhole stub 2, beyond its upper edge, and onto the upper surface of a fixing flange 25, which is only diagrammatically shown in FIG. 1, to form the lead sealing surface 10.

[0045] A seal 11, typically made of a plastic resistant to bromine, such as polytetrafluoroethylene (PTFE), is provided between the sealing surface on the underside of the dome cover 1 and the sealing surface 10 on the manhole pipe piece.

[0046] The outer periphery of the dome cover 1 is provided with a series of through holes 12 for fastening means, e.g. threaded pins or the like, for fastening the dome cover 1 to the manhole section 2. The fastening means are tightened to obtain a tight closure, which exerts a high pressing pressure on the lead sealing surface on the underside of the dome cover 1 and its corresponding lead sealing surface 10 on the upper side of the manhole section 2.

[0047] Fig. 2 shows a plan view of the dome cover 1 shown in Fig. 1. Fig. 2 also shows the structure provided on the underside of the dome cover, including the upper opening 13 of the manhole pipe section 2.

[0048] On the upper surface of the dome cover 1 there are located valves 4, 5, 6, another valve 7 which is a safety valve, and a through hole 12 with a number of fixing means arranged at a distance from one another along the peripheral area of ​​the dome cover 1.

[0049] Viewed from the inside to the outside, each circle indicates the opening 13 of the manhole pipe section 2, the outer surface 14 of the planar lead coating 8 provided on the underside of the dome cover 1, the outer surface 15 of the dome cover 1, and the outer surface 16 of the fixing flange 25 provided on the manhole pipe section 2.

[0050] 3 shows the connection of the valves 4, 5, 6, 7 to the dome cover 1 and thus to the container by way of example of a safety valve 7. For the connection, the dome cover 1 is provided with a through hole 17 at the position provided for this purpose.

[0051] A lead layer 8 on the underside of the dome cover 1 contacts the inner wall of the through hole 17, extends beyond the upper edge of the through hole 17, and surrounds the through hole 17 to form a lead sealing surface 18 on which the valve 7 rests.

[0052] In addition, a seal 19 made of a bromine-resistant plastic, for example PTFE, is located between the valve 7 and an annular disc-shaped lead sealing surface 18 .

[0053] For fixing the valve, a blind hole 20 may be provided in the upper surface of the dome cover 1, surrounding the through hole 17 and the lead sealing surface 18. In this blind hole 20, a suitable fixing means 21, a typical stud bolt, may be engaged, for example as shown in FIG.

[0054] The dome cover 1 shown in Figures 1 to 3 corresponds to the prior art and is manufactured from steel. The dome cover 1 is provided on its underside with a surface-shaped lead coating 8, which also covers the inner walls of the through-holes 17 for connecting the valves, extends beyond the upper edge of the through-holes 17 and surrounds them to form in each case an annular disk-shaped lead sealing surface 18 on which the valves are placed.

[0055] For the fastening of the valve to the dome cover 1 and the dome cover 1 to the manhole piece 2, the respective sealing surfaces are pressed securely against one another, so that the required sealing effect can be guaranteed. In this case, large forces also act in these areas.

[0056] 4 to 8 show diagrammatically the individual steps of the preparation of a dome cover 1 according to the prior art and the present invention.

[0057] 4 shows a diametric longitudinal section of an uncoated dome cover 1 with three through holes 17 for connecting the valves 4, 5, 6. Furthermore, around the through holes 17 for connecting the valves 4, 5, 6, there are blind holes 20 for fastening the valves 4, 5, 6 and along the peripheral area of ​​the dome cover 1 there are through holes 12 for fastening means for fastening the dome cover 1 to the manhole piece 2.

[0058] Reference numeral 15 denotes the outer circumferential surface of the dome cover 1 .

[0059] In Figure 5, the dome cover 1 shown in Figure 4 is shown with a prior art lead coating, in which the underside of the dome cover, the inner walls of the through hole 17, and the sealing surface 18 surrounding the through hole 17 are coated with a continuous layer of lead 8.

[0060] The planar lead layer 8 provided on the lower surface of the dome cover 1 reaches the through-hole 12, as can be seen by the outer peripheral surface 14 of the lead layer 8 in FIG.

[0061] In Fig. 6, in comparison with Fig. 5, a dome cover 1 formed according to the invention can be seen, in which the lead coating 8 has been replaced by nickel sealing surfaces 22; 23 in the areas of the dome cover 1 that are exposed to particular pressure loads.

[0062] These areas are in particular, on the upper side of the dome cover 1, the area annularly surrounding the through-hole 17 for the valve, which forms the corresponding surface for the valve, and, on the lower side, the peripheral area where the dome cover 1 rests on the manhole piece 2. In these areas, according to the invention, the lead coating is replaced by nickel sealing surfaces 22; 23.

[0063] The nickel sealing surfaces 22, 23 each have an annular disk-like configuration in the illustrated configuration.

[0064] Thus, as shown in FIG. 6, the lead coating provided on the upper surface of the dome cover 1 along the periphery of the through hole 17 for connecting the valve is replaced by an annular disk-shaped nickel sealing surface 22 .

[0065] As can be seen in Figures 6 and 7, the nickel sealing surface 22 is located in the area between the through hole 17 and the blind hole 20, which extends downwardly from the top surface of the dome cover 1 into the dome cover 1.

[0066] Likewise, on the underside of the dome cover 1, the area of ​​the resting surface of the dome cover 1 on the manhole pipe 2 is replaced by a corresponding annular, disk-shaped nickel sealing surface 23. This nickel sealing surface 23 extends on the underside of the dome cover 1 along the inner circumference of the through-hole 12 for the fastening means for fastening the dome cover 1 to the manhole pipe 2, so that the nickel sealing surface 23 is located between the lead coating layer 8 and the through-hole 12.

[0067] In the example given herein, the thickness of the nickel sealing surface 22 may be 6-10 mm, and the thickness of the nickel sealing surfaces 23, 24 may be 10 mm. The thickness of the nickel sealing surfaces depends on the requirements of the application of the vessel. Typically, the thickness of the nickel sealing surfaces may be 4 mm-20 mm. The thickness for the nickel sealing surface 22 may be selected to be smaller than the thickness for the nickel sealing surface 23 provided on the underside of the dome cover and the thickness of the nickel sealing surface 24 provided on the manhole pipe piece.

[0068] To manufacture the dome cover 1, first a nickel coating is applied by overlay welding to a steel blank of the dimensions for the dome cover at the location specified for the through hole for the valve, with the desired dimensions and thickness for the nickel sealing surface 22.

[0069] Furthermore, a nickel sealing surface 23 is attached to the lower surface of the dome cover by overlay welding.

[0070] By using a build-up welding process, the desired nickel sealing surfaces 22, 23 can be obtained simply and with almost no material loss. A full metallurgical bond is formed between the nickel sealing surfaces and the dome cover.

[0071] After the deposition of nickel for the nickel sealing surfaces 22, 23, the dome cover 1 is mechanically processed to produce the through hole 17 for the valve and the blind hole 20 etc. As a result, a preliminary dome cover as shown in Fig. 7 is obtained, which has the through hole 17 for the valve, the nickel sealing surface 22 along the upper periphery of the through hole 17, the nickel sealing surface 23 on the underside of the dome cover along the mounting area where the dome cover 1 is mounted on the manhole pipe section 2, the through hole 12 for the fastening means for fastening the dome cover 1 to the manhole pipe section 2, and the blind hole 20 for the fastening means for fastening the valve to the dome cover.

[0072] This is followed by the application of a lead coating 8 by known techniques, which is applied in a planar manner to the underside of the dome cover in the area surrounded by the nickel sealing surface 23 and is guided along the inner surface of the through hole 17 to the upper edge of the nickel sealing surface 22, as shown in FIG.

[0073] As a result, according to the invention, a dome cover 1 is obtained in which particularly critical areas exposed to high pressing pressures during operation are selectively provided with nickel sealing surfaces 22, 23.

[0074] Unlike lead, nickel, due to its high hardness, does not exhibit plastic deformation, e.g. creep, even under high compressive loads, so that the nickel sealing surfaces 22, 23 maintain their shape and therefore their sealing properties even under sustained high pressure.

[0075] Similar to the dome cover 1, according to the present invention, the manhole stub 2 also has the lead sealing surface 10 replaced by a nickel sealing surface 24, as shown in FIG. 8, which shows a longitudinal cross-sectional view of the manhole stub 2.

[0076] Along the upper opening of the manhole stub 2, a fixing flange 25 is provided. This fixing flange 25 extends around the circumference of the manhole stub 2 and overhangs the entire circumference of the manhole stub 2. This protruding peripheral area of ​​the fixing flange 25 is provided with a number of through holes 26. These through holes 26 are distributed around the entire circumference and spaced apart from one another and are used to fasten the dome cover 1 to the manhole stub 2.

[0077] The lead coating 9 extends from the upper edge of the nickel sealing surface 24 down the inner wall of the manhole section 2 and along the inner wall of the vessel body (not shown).

[0078] In Figure 9 there is shown a plan view of the manhole stub 2 with the fixing flange 25 shown in Figure 8. In this plan view three concentrically arranged annular regions can be seen.

[0079] The outer annular area 16 is the protruding peripheral area of ​​a fixing flange 25 having a through hole 26, the middle annular area is an annular disk-shaped nickel sealing surface 24 and the inner annular area is the lead coating 9.

[0080] When the dome cover 1 according to the invention is placed on the manhole pipe 2 according to the invention, the nickel sealing surface 23 on the underside of the dome cover 1 rests on the nickel sealing surface 24 on the fixing flange 25 of the manhole pipe 2. As a result, the nickel sealing surfaces 23, 24 then overlap each other in this area that is loaded by the pressing pressure. These nickel sealing surfaces 23, 24, unlike conventional lead coatings, are able to withstand the pressure exerted by the other components that they come into contact with.

[0081] In operation, a plastic seal 11, for example made of PTFE, is additionally provided between the two nickel sealing surfaces 23, 24. In principle, any seal may be used as long as it is inert to bromine.

[0082] In one configuration (FIG. 10), the upper surfaces of the nickel sealing surfaces 22, 23, 24 may be provided with concentrically extending grooves 27. These grooves 27 receive the plastic seals 11, 19, which allows the seals 11, 19 to be forced into the grooves 27 by compression pressure, thus improving the seating and sealing of the seals 11, 19.

[0083] For the purposes of manufacture, it is mentioned in principle that the application of nickel to steel, in particular to form the sealing surfaces 22, 23, 24, is effected by build-up welding, while the connection between different metal surfaces is effected, for example, by welding between two steel surfaces, for example between the fixing flange 25 and the manhole pipe piece 2. In contrast, the connection between lead and nickel or between lead and steel is preferably effected by brazing.

[0084] The welded connections (weld seams) between the individual components are usually recognised in the drawings by generally triangular black areas x, for example in FIG. 8 between the manhole pipe section and the fixing flange 25 .

[0085] FIG. 11 shows a vertical cross-sectional view of a manhole end 2 closed with a dome cover 1 according to the present invention.

[0086] The cross section is again guided in Fig. 11 along the through holes 17 for the three valves 4, 5, 6 arranged along the diameter of the dome cover 1. It can be clearly seen that the annular disk-shaped nickel sealing surface 23 provided on the underside of the dome cover 1 rests on the annular disk-shaped nickel sealing surface 24 provided on the fixing flange 25 of the manhole pipe piece 2. Between both annular disk-shaped nickel sealing surfaces 23, 24 a plastic seal 11 is provided.

[0087] Another nickel sealing surface 22 is disposed on the upper surface of the dome cover surrounding the periphery of the valve connection through hole 17. The remaining lead coating 8, in the illustrated configuration, extends from the upper edge of the nickel sealing surface 22 along the inner wall of the valve structure through hole 17 to the underside of the dome cover, where it extends to the nickel sealing surface 23.

[0088] The thickness of the sealing surfaces 22, 23, 24 is 10 mm each in this example.

[0089] Similarly, the lead coating 9 in the manhole section extends from the upper edge of the nickel sealing surface 24 down the inside periphery of the fixing flange 25 within the manhole section 2 and from there to the inside wall of the corresponding container (not shown in FIG. 11).

[0090] The dome cover 1 and the fixing flange 25 are provided in their peripheral areas lying outside the nickel sealing surfaces 22, 23 with through holes 12, 26 (not shown) for fixing means.

[0091] The main idea of ​​the invention is to replace the areas of the lead coating which are loaded by the pressing pressure with corresponding nickel inserts or nickel sealing surfaces.

[0092] Advantageously, this nickel sealing surface is attached to a suitable support by means of build-up welding.

[0093] Naturally, the present invention is not limited to the embodiments described above for illustration in the drawings, but is also suitable for dome covers that have no through holes for valve connection at all or dome covers that have more or fewer through holes.

[0094] Also, instead of the annular disk shaped nickel sealing surface illustrated in the drawings, nickel sealing surfaces formed in other shapes may be used if desired.

[0095] The dimensions of the nickel sealing surface, for example the thickness or width, may also be adapted to the requirements of the respective application of the container.

[0096] Another major advantage of the present invention is that existing containers can be easily retrofitted with the present invention, which means that containers that have been rejected due to wear of the lead coating on the sealing surfaces and a corresponding lack of sealing properties can be made suitable for use again.

[0097] The retrofitting will be described by way of example with reference to FIG. 12 and FIG.

[0098] 12 shows a longitudinal section of a manhole section 2 which has been retrofitted according to the invention. For the retrofit, the existing fixing flange 25 is fitted with a make-up flange 28 with a nickel sealing surface 24.

[0099] The dimensioning and configuration of the supplementary flange 28 with its nickel sealing surface 24 and through holes 29 for the fastening means is adapted to the existing fastening flange 25 .

[0100] To retrofit a conventional vessel with a lead sealing surface, first the old lead sealing surface 10 and the lead coating 9 extending to the inside of the manhole section 2 are removed.

[0101] A make-up flange 28 of the same material is then applied to the existing fastening flange 25. In the area of ​​the sealing surface, this make-up flange 28 has an annular disk-shaped nickel sealing surface 24, as shown in FIG. 13, instead of the conventional lead sealing surface 10, as shown in FIG. 5, for example.

[0102] The lead coating 9 is then renewed down into the manhole section 2 between the upper edges of the nickel sealing surfaces 24 .

[0103] In this case too, the nickel sealing surface 24 is provided on the surface of the additional fixing flange 28, advantageously by overlay welding, and the additional fixing flange 28 is joined to the existing fixing flange 25 by welding.

[0104] The weld seam between the manhole pipe section 2 and the fixing flange 25 is generally and conventionally recognized by a black surface x.

[0105] The container thus provided with the manhole stub 2 modified according to the invention can then be made available for use again together with the dome cover 1 according to the invention.

[0106] The invention relates to a vessel, for example a tank vessel, with a manhole stub 2 and a dome cover 1 for closing said manhole stub 2, which vessel is lined with lead for transporting a hazardous filling, for example bromine, the dome cover 1 and the manhole stub 2 having sealing surfaces 22, 23, 24 made of nickel, in particular formed by overlay welding, as well as to a conventional vessel retrofitted according to the invention and a method therefor. [Explanation of symbols]

[0107] 1 Dome cover 2 Manhole pipe section 3 Dome cover hood 4 Middle valve 5. Left valve 6 Right valve 7. Safety valve 8 Planar lead layer 9 Lead coating (of manhole pipes) 10 Lead sealing surface (of manhole pipe section) 11 Seal (between dome cover and manhole pipe section) 12 Through hole for fixing the dome cover to the pipe piece 13 (Manhole pipe) opening 14 Outer surface of the planar lead layer 8 15 Outer surface of dome cover 16 Outer circumferential surface of flange ring 25 17 Through hole (for fixing the valve) 18 (of valve) lead sealing surface 19 (Valve connection) seal 20 Blind hole (for valve fixing) 21 Fixing means (for valves) 22 Nickel sealing surface (of valve) 23 Nickel sealing surface (underside of bubble cover) 24 Nickel sealing surface (of manhole pipe section) 25 fixed flange (with outer peripheral surface 16) 26 (Fixed flange 25) through hole 27 Concentric Grooves 28 Compensating flange 29 (of the filling flange 28) through hole x Welded seam

Claims

1. A container with a manhole stub (2) that can be closed with a dome cover (1), At least the inner wall of the container and the inner wall of the manhole pipe section (2) are provided with a lead coating (9); A fixing flange (25) is provided surrounding the upper opening of the manhole pipe piece (2), A nickel sealing surface (24) is attached to the upper surface of the fixing flange (25) surrounding the opening leading to the manhole pipe piece (2) as a sealing portion for the dome cover (1), The nickel sealing surface (24) is aligned with the opening to the manhole stub (2), and the lead coating (9) extends to the upper edge of the nickel sealing surface (24). container.

2. A supplementary flange (28) is attached to the fixed flange (25), The nickel sealing surface (24) is located on the upper surface of the filling flange (28). The container of claim 1.

3. A dome cover (1) for a container according to claim 1 or 2, A nickel sealing surface (23) is provided on the underside of the dome cover (1), and the nickel sealing surface (23) is assigned to the nickel sealing surface (24) of the manhole pipe piece (2); The nickel sealing surface (23) is provided in a peripheral area on the lower surface of the dome cover (1), and during operation, the dome cover (1) is positioned in the peripheral area against the nickel sealing surface (24) of the manhole pipe piece (2), and the surface of the lower surface of the dome cover (1) surrounded by the sealing surface (23) is coated with a lead layer (8). Dome cover (1).

4. The dome cover (1) has one or more through holes (17) for connecting devices; The lead layer (8) provided on the lower surface of the dome cover (1) extends along the inner wall of the through hole (17) and covers the inner wall. The dome cover according to claim 3.

5. A nickel sealing surface (22) is provided on the upper surface of the dome cover (1) surrounding the opening of the through hole (17) to seal against the equipment; The nickel sealing surface (22) is aligned with the through hole (17), and the lead layer (8) extends to the upper edge of the nickel sealing surface (22). The dome cover (1) according to claim 4.

6. 6. The dome cover (1) according to claim 5, wherein the equipment is selected from a valve for filling and unloading the container (4), a valve (6) for venting the container, a valve (5) for introducing gas into the container, and a safety valve (7).

7. The dome cover of claim 3, wherein a nickel sealing surface (22) is formed on the upper surface of the dome cover (1) by overlay welding, and a nickel sealing surface (23) is formed on the lower surface of the dome cover (1) by overlay welding.

8. 3. The vessel according to claim 1, wherein the nickel sealing surface (24) is formed by overlay welding.

9. 10. A method for manufacturing a container and a dome cover according to claim 1, comprising: A method in which nickel sealing surfaces (22, 23, 24) are formed on the material surface by overlay welding.

10. 3. A method for manufacturing the container of claim 2, comprising: The method comprises fitting a filler flange (28) to the fixed flange (25) of the manhole pipe section (2) and fitting the nickel sealing surface (24) to the filler flange (28).

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