EP0640697B1 - Water tank and procedure for its fabrication - Google Patents
Water tank and procedure for its fabrication Download PDFInfo
- Publication number
- EP0640697B1 EP0640697B1 EP94108272A EP94108272A EP0640697B1 EP 0640697 B1 EP0640697 B1 EP 0640697B1 EP 94108272 A EP94108272 A EP 94108272A EP 94108272 A EP94108272 A EP 94108272A EP 0640697 B1 EP0640697 B1 EP 0640697B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chloride
- welding
- wetted
- sulphate
- storage vessel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 210000003298 dental enamel Anatomy 0.000 claims abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 11
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 10
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000005083 Zinc sulfide Substances 0.000 claims abstract description 7
- 229910000480 nickel oxide Inorganic materials 0.000 claims abstract description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Inorganic materials [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- -1 alkaline earth metal sulphate Chemical class 0.000 claims abstract description 5
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 5
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 5
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011780 sodium chloride Substances 0.000 claims abstract description 5
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims abstract description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 4
- 229910000428 cobalt oxide Inorganic materials 0.000 claims abstract 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims abstract 3
- 238000003860 storage Methods 0.000 claims description 19
- 238000003466 welding Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000009736 wetting Methods 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910052783 alkali metal Inorganic materials 0.000 abstract 1
- 150000001340 alkali metals Chemical class 0.000 abstract 1
- 239000002585 base Substances 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 description 4
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 231100000647 material safety data sheet Toxicity 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/18—Water-storage heaters
- F24H1/181—Construction of the tank
- F24H1/183—Inner linings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D3/00—Chemical treatment of the metal surfaces prior to coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
- C23D5/02—Coating with enamels or vitreous layers by wet methods
Definitions
- the present invention relates to an internally enamelled steel water tank and to a method for its production according to the preambles of the independent claims.
- the first step was to apply a second layer of enamel, in which the enamelling process was repeated after the first layer of enamel had been fired.
- the need for protective current is then considerably lower, but the production costs of a storage device are greatly increased.
- the present invention has for its object to reduce the defectiveness of the internal enamelling of such a storage container without significantly increasing its manufacturing costs.
- the significantly low protective current requirement is significant for the quality of the enamel obtained compared to the prior art, with hardly increased manufacturing costs.
- a hot water tank 31 has a storage housing 1, which is provided on its inside with insulation 2, within which the actual storage tank 3 is mounted.
- the storage container consists of a hollow cylindrical jacket part 4, the upper end 5 and the lower end 6 of which are covered by a base 7 and a cover 8, respectively.
- Bottom and lid are hemispherical structures and exist as well as the jacket part 4 made of unalloyed steel.
- the end 9 of the cover 8 and the end 10 of the bottom 7 are welded to the ends 5 and 6 of the jacket 4.
- the weld seam 18 forms a ring.
- the jacket sheet also has a longitudinal weld 11. All these three weld seams 18 and 11 are located in the interior 32 of the container 3 and are no longer accessible after the entire container 3 has been welded together.
- connecting pieces 14 and 15 can be provided for the passage of a heating element 33 into the interior 32 of the storage container 3, whereby either a water-filled pipe coil or an electric heating element is connected through these connecting pieces. Both alternatives serve for the external heating of the content of the water reservoir 3.
- feet 17 are provided for placing the storage container on a floor.
- recesses can be present, for example in the case of a store which is heated directly by a gas burner, for carrying out the immersion combustion chamber, for providing a cleaning opening, for inserting an anode, a temperature sensor and the like.
- These recesses or pipe sockets are omitted for the sake of simplicity.
- the storage container is manufactured as follows:
- the jacket part 4 is made from a sheet metal strip cut to size, possibly after making any recesses, by bending to the jacket shape, and then the longitudinal weld 11 is welded.
- the lid and base are deep drawn from sheet metal, the holes for any sockets are made, the sockets are welded in if necessary. Then coat and base or lid are degreased, and after degreasing they are freed of adhering layers and contaminants. Then they are roughened by blasting with metal grains.
- an aqueous solution of 50 to 300 g of an alkali or alkaline earth metal sulfate or chloride for example magnesium sulfate (MgSO 4 ), Magnesium chloride (MgCl 2 ), sodium sulfate (Na 2 SO 4 ) or sodium chloride (NaCl) per liter of water or a slurry of zinc sulfide (ZnS), nickel oxide (NiO) or cobalt oxide (Co 3 O 4 ).
- a concentration of 87 g of MgSO 4 per liter of water has proven to be particularly expedient.
- the height of the wetted seam area is also important. It has been found that wetting only a few millimeters on both sides of the weld seam to be provided and wetting of an area of more than 4 cm on both sides of the seam area do not lead to so good results. If an area of 2.0 to 3 cm on both sides of each seam is wetted with this aqueous solution or aqueous slurry, this has an influence on the adhesive behavior of the enamel slip to be applied subsequently, which adheres particularly well in this area. The burning of the angry Email slip then happens as in the prior art.
- the problem of the adhesion of the enamel layer also arises only in the case of weld seams or weld seam sides in the area of the interior 32, that is to say in the area of the reservoir which will no longer be accessible later. External weld spots can be easily cleaned by blasting again with other particles after welding. Accordingly, the two weld seams between cover and middle part and bottom and middle part in the inner region of the storage container 3 are particularly at risk. These areas are therefore wetted.
- the area of the longitudinal weld seam 11 can also be cleaned of welding residues from the inner area by re-treatment by blasting with metal bodies.
- FIG. 2 shows an enlarged part of the inside view of a weld seam, this weld seam 18 consisting of the actual weld seam area, delimited by the boundary line 19 and 20, the wetted layer on both sides of the weld seam 18 is designated by 21 and 23, its limits by 22 and 24. If you open a store treated in this way, you can see the boundary lines 22 and 23 through elevations on the inside.
- alkali or alkaline earth metal sulfate or chloride preferably MgSO 4
- Wetting with alkali or alkaline earth metal sulfate or chloride, preferably MgSO 4 has the additional advantage of no dangers during handling and storage for the personnel, it is also safe for the user of the storage under food law (DIN safety data sheet 52900). Disposal is also easy.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
Die vorliegende Erfindung bezieht sich auf einen innen emaillierten Wasserbehälter aus Stahl und auf ein Verfahren zu seiner Herstellung gemäß den Oberbegriffen der unabhängigen Patentansprüche.The present invention relates to an internally enamelled steel water tank and to a method for its production according to the preambles of the independent claims.
Es ist bekannt, Wasserbehälter für gas- oder elektrisch beheizte Warmwasserspeicher aus einem Mantelring und einem Deckel und einem Boden herzustellen. Die Böden werden hierbei tiefgezogen, der Mantelring wird aus einem Blechstreifen gebogen und längsnahtgeschweißt. Die so geformten Einzelteile des Speichers werden dann entfettet und von anhaftenden Schichten und von Schmutz gereinigt. Daraufhin werden die so behandelten Teile durch Strahlen mit Metallkornkörpern aufgerauht. Anschließend werden Mantel und Boden beziehungsweise Mantel und Deckel geschweißt, und dann erfolgt die Benetzung des gesamten Innenraums des Speicherbehälters mit Emailschlicker, der nach dem Benetzen, getrocknet und gebrannt wird (vgl. DE-A-3 101 274).It is known to produce water containers for gas or electrically heated hot water storage tanks from a casing ring and a cover and a base. The bottoms are deep-drawn, the jacket ring is bent from a sheet metal strip and welded lengthways. The individual parts of the accumulator shaped in this way are then degreased and cleaned of adhering layers and dirt. The parts treated in this way are then roughened by blasting with metal granules. The jacket and base or jacket and lid are then welded, and then the entire interior of the storage container is wetted with enamel slip, which is dried and fired after wetting (cf. DE-A-3 101 274).
Es hat sich gezeigt, daß die auf diese Art und Weise gewonnene Innenemaillierung nicht die in sie gestellten Erwartungen erfüllt hat. Dies zeigt sich zum Beispiel an der Höhe des Normschutzstrombedarfes, dessen Größe ein Maß für die Güte der Emailschicht ist. Bei Speicherbehältern mit besonders hohem Normschutzstrom konnte nach dem Aufschneiden des Behälters festgestellt werden, daß das Email im Bereich der Schweißnähte nur schlecht haftet, daß mehr oder weniger große Stellen gefunden wurden, an denen das Email an der Schweißnaht nicht gehaftet hat.It has been shown that the interior enamelling obtained in this way does not meet the expectations placed on it Has. This can be seen, for example, from the amount of standard protection current required, the size of which is a measure of the quality of the enamel layer. In the case of storage containers with a particularly high standard protection current, it was found after the container had been cut open that the enamel had poor adhesion in the area of the weld seams, and that more or less large places were found where the enamel had not adhered to the weld seam.
Man hat sich zunächst zur Behebung dieser Schäden damit geholfen, eine zweite Emailschicht aufzutragen, bei der also der Emaillierungsvorgang nach dem Brennen der ersten Emailschicht wiederholt wurde. Der Schutzstrombedarf ist dann zwar wesentlich geringer, aber die Herstellkosten eines Speichers sehr erhöht.To remedy this damage, the first step was to apply a second layer of enamel, in which the enamelling process was repeated after the first layer of enamel had been fired. The need for protective current is then considerably lower, but the production costs of a storage device are greatly increased.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Fehlerhaftigkeit der Innenemaillierung eines solchen Speicherbehälters zu verringern, ohne dessen Herstellkosten wesentlich zu erhöhen.The present invention has for its object to reduce the defectiveness of the internal enamelling of such a storage container without significantly increasing its manufacturing costs.
Die Lösung der Aufgabe gelingt bei einem Speicher der eingangs näher bezeichneten Art erfindungsgemäß mit den Merkmalen der Sachansprüche 1-2, beziehungsweise ein Verfahren der eingangs näher bezeichneten Art zur Lösung der Aufgabe gelingt erfindungsgemäß mit den Merkmalen des unabhängigen Verfahrensanspruchs 3.The problem is solved in a memory of the type specified in the introduction with the features of the claims 1-2, or a method of the type specified in the introduction for solving the problem is achieved in accordance with the invention with the features of the
Besonders vorteilhafte Ausführungsformen zur Durchführung des Verfahrens ergeben sich aus den abhängigen Patentansprüchen 4-6.Particularly advantageous embodiments for carrying out the method result from the dependent patent claims 4-6.
Bei der Anwendung des Verfahrens beziehungsweise bei den hiernach gefertigten Speicherbehältern ist bei kaum erhöhten Herstellkosten der deutlich niedrige Schutzstrombedarf signifikant für die gewonnene Güte der Emaille gegenüber dem Stand der Technik.When using the method or with the storage containers manufactured according to it, the significantly low protective current requirement is significant for the quality of the enamel obtained compared to the prior art, with hardly increased manufacturing costs.
Ein Ausführungsbeispiel der Erfindung wird nun anhand der Figuren der Zeichnung näher erläutert.An embodiment of the invention is now explained in more detail with reference to the figures of the drawing.
Es zeigen:
- Figur 1 eine Querschnittsdarstellung eines Warmwasserspeichers und
Figur 2 einen Ausschnitt einer Ansicht auf eine Schweißnaht.
- Figure 1 is a cross-sectional view of a hot water tank and
- Figure 2 shows a detail of a view of a weld.
In beiden Figuren bedeuten gleiche Bezugszeichen jeweils die gleichen Einzelheiten.In both figures, the same reference symbols denote the same details.
Ein Warmwasserspeicher 31 weist ein Speichergehäuse 1 auf, das auf seiner Innenseite mit einer Isolierung 2 versehen ist, innerhalb derer der eigentliche Speicherbehälter 3 gelagert ist. Der Speicherbehälter besteht aus einem hohlzylindrischen Mantelteil 4, dessen oberes Ende 5 und dessen unteres Ende 6 von einem Boden 7 beziehungsweise einem Deckel 8 abgedeckt sind. Boden und Deckel sind halbhohlkugelähnliche Gebilde und bestehen wie auch das Mantelteil 4 aus unlegiertem Stahl. Das Ende 9 des Deckels 8 beziehungsweise das Ende 10 des Bodens 7 sind mit den Enden 5 und 6 des Mantels 4 verschweißt. Die Schweißnaht 18 bildet einen Ring. Weiterhin weist auch das Mantelblech eine Längsschweißnaht 11 auf. Alle diese drei Schweißnähte 18 und 11 befinden sich im Innenraum 32 des Behälters 3 und sind nach dem Zusammenschweißen des gesamten Behälters 3 nicht mehr zugänglich. Durch den Deckel 8 reichen Stutzen 12 und 13, die später dem Kaltwassereinlauf und der Warmwasserentnahme dienen. Weiterhin können Stutzen 14 und 15 zur Durchführung eines Heizkörpers 33 in den Innenraum 32 des Speicherbehälters 3 vorhanden sein, wobei durch diese Stutzen entweder eine wassergefüllte Rohrschlange oder ein elektrischer Heizkörper angeschlossen werden. Beide Alternativen dienen der Fremdbeheizung des Inhalts des Wasserspeichers 3.A
An der Unterseite 16 des Gehäuses 1 sind Füße 17 zur Aufstellung des Speicherbehälters auf einem Boden vorgesehen.On the
Im Mantelteil 4 können weitere nicht dargestellte Ausnehmungen vorhanden sein, beispielsweise bei einem direkt durch einen Gasbrenner beheizten Speicher zur Durchführung der Tauchbrennkammer, für das Vorsehen einer Reinigungsöffnung, für das Einführen einer Anode, eines Temperaturfühlers und dergleichen. Diese Ausnehmungen beziehungsweise Rohrstutzen sind der Einfachheit halber fortgelassen.In the
Die Herstellung des Speicherbehälters erfolgt wie folgt:The storage container is manufactured as follows:
Das Mantelteil 4 wird aus einem auf Maß, ggf. nach Einbringung etwaiger Ausnehmungen, geschnittenen Blechstreifen durch Biegen zur Mantelform gebracht, und anschließend wird die Längsschweißnaht 11 geschweißt. Deckel und Boden werden aus Blechplatinen tiefgezogen, die Löcher für etwaige Stutzen werden eingebracht, die Stutzen werden gegebenenfalls eingeschweißt. Anschließend werden Mantel und Boden beziehungsweise Deckel entfettet, und nach dem Entfetten werden sie von anhafteten Schichten und Verunreinigungen befreit. Dann werden sie durch Strahlen mit Metallkornkörpern aufgerauht. Nunmehr kommt der erfindungswesentliche Schritt, nämlich das Benetzen der Schweißnahtbereiche in einem Bereich von 1 bis 4 cm beiderseits jeder Schweißnaht im Innenraum 32 mit einer wäßrigen Lösung von 50 bis 300 g eines Alkali- oder Erdalkalisulfates oder-chlorides, beispielsweise Magnesiumsulfat (MgSO4), Magnesiumchlorid (MgCl2), Natriumsulfat (Na2SO4) oder Natriumchlorid (NaCl) pro Liter Wasser oder einer Aufschlämmung von Zinksulfid (ZnS), Nickeloxid (NiO) oder Kobaltoxid (Co3O4). Als besonders zweckmäßig hat sich eine Konzentration von 87 g MgSO4 auf ein Liter Wasser erwiesen. Auch die Höhe des benetzten Nahtbereiches ist wesentlich, es hat sich herausgestellt, daß eine Benetzung nur weniger Millimeter beiderseits der vorzusehenen Schweißnaht und eine Benetzung von einem Bereich von mehr als 4 cm beiderseits des Nahtbereichs zu nicht so guten Ergebnissen führen. Wird ein Bereich von 2,0 bis 3 cm beiderseits jeder Naht mit dieser wässrigen Lösung oder wässrigen Aufschlämmung benetzt, so hat das einen Einfluß auf das Haftverhalten des anschließend aufzubringenden Emailschlickers, der in diesem Bereich besonders gut haftet. Das Brennen des aufgebrachten Emailschlickers geschieht dann anschließend wie beim Stand der Technik. Das Problem der Haftung der Emailschicht stellt sich auch nur bei Schweißnähten oder Schweißnahtseiten im Bereich des Innenraumes 32, das heißt im später nicht mehr zugänglichen Bereich des Speichers. Außennahtschweißstellen können nach dem Schweißen ohne weiteres durch erneutes Strahlen mit anderen Partikeln gesäubert werden. Demgemäß sind also insbesondere die beiden Schweißnähte zwischen Deckel und Mittelteil und Boden und Mittelteil in dem Innenbereich des Speicherbehälters 3 gefährdet. Diese Bereiche werden also benetzt. Den Bereich der Längsschweißnaht 11 kann man auch vom Innenbereich durch erneutes Behandeln durch Strahlen mit Metallkörpern von Schweißrückständen reinigen.The
Die Figur 2 zeigt einen vergrößerten Teil der Innenansicht einer Schweißnaht, wobei diese Schweißnaht 18 aus dem eigentlichen Schweißnahtbereich, begrenzt durch die Grenzlinie 19 und 20, besteht, die benetzte Schicht beiderseits der Schweißnaht 18 ist mit 21 und 23 bezeichnet, ihre Grenzen mit 22 und 24. Öffnet man einen so behandelten Speicher, so kann man die Grenzlinien 22 und 23 durch Erhebungen an der Innenseite sehen.FIG. 2 shows an enlarged part of the inside view of a weld seam, this
Auch eine Benetzung mit einer wässrigen Lösung von Natriummolybdat (Na2Mo04) brachte gute Ergebnisse, desgleichen eine wasserhaltige A....lämmung von Kobaltoxid (Co3O4), Nickeloxid (NiO) oder Zinksulfid (ZnS).Wetting with an aqueous solution of sodium molybdate (Na 2 Mo0 4 ) also gave good results, as did water-containing A .... insulation of cobalt oxide (Co 3 O 4 ), nickel oxide (NiO) or zinc sulfide (ZnS).
Die Benetzung mit Alkali- oder Erdalkalisulfat oder -chlorid, vorzugsweise MgSO4 hat den zusätzlichen Vorteil, keine Gefahren bei Handhabung und Lagerung für das Personal zu bergen, weiterhin ist es für den Benutzer der Speicher lebensmittelrechtlich unbedenklich (DIN-Sicherheitsdatenblatt 52900). Auch die Entsorgung ist problemlos.Wetting with alkali or alkaline earth metal sulfate or chloride, preferably MgSO 4, has the additional advantage of no dangers during handling and storage for the personnel, it is also safe for the user of the storage under food law (DIN safety data sheet 52900). Disposal is also easy.
Claims (6)
- Internally enamelled storage vessel for a water reservoir, consisting of a roughly cylindrical jacket and a preformed bottom and a cover, connected with one another by welding seams, characterized in that prior to welding the welding seam areas are wetted with an alkali or alkaline earth metal sulphate or chloride, preferably sodium sulphate or chloride or magnesium sulphate or chloride.
- Internaliy enamelled storage vessel for a water reservoir, consisting of a roughly cylindrical jacket and a preformed bottom and a cover, connected with one another by welding seams, characterized in that prior to welding the welding seam areas are wetted with zinc sulphide, nickel oxide or cobalt oxide.
- Process for the manufacture of an internally enamelled storage vessel for a water reservoir, consisting of a roughly cylindrical jacket and a preformed bottom and a cover, which are initially degreased and, if necessary, grit-blasted with a metal grit, then welded together, coated with an enamel slip which is subsequently baked, characterized in that prior to welding the welding seam areas are wetted with an aqueous solution of an alkali or alkaline earth metal sulphate or chloride, preferably sodium sulphate or chloride or magnesium sulphate or chloride or an aqueous slurry of zinc sulphide, nickel oxide or cobalt oxide.
- Process as claimed in Claim 3, characterized in that the concentration of the said aqueous solution is between 50 and 300 grams of magnesium sulphate per litre of water.
- Process as claimed in Claim 3, characterized in that the width of the wetted areas is between 1 and 4 cm on both sides of the welding seam, preferably between 2 and 3 cm.
- Process as claimed in any of Claims 3 to 5, characterized in that wetting is carried out on the interior of the storage vessel.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4319113A DE4319113C1 (en) | 1993-06-05 | 1993-06-05 | Internally enamelled water storage tank |
| DE4319113 | 1993-06-05 | ||
| DE4415587 | 1994-04-28 | ||
| DE4415587 | 1994-04-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0640697A1 EP0640697A1 (en) | 1995-03-01 |
| EP0640697B1 true EP0640697B1 (en) | 1997-08-13 |
Family
ID=25926621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94108272A Expired - Lifetime EP0640697B1 (en) | 1993-06-05 | 1994-05-28 | Water tank and procedure for its fabrication |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0640697B1 (en) |
| AT (1) | ATE156869T1 (en) |
| DE (1) | DE59403711D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6161272A (en) * | 1999-08-23 | 2000-12-19 | Madison; Charles D. | Liquid storage tank apparatus and method of forming same |
| EP3054235A1 (en) * | 2015-02-09 | 2016-08-10 | Ariston Thermo S.p.A. | Coating method for metal tanks with coil-wound heat exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3101274A1 (en) * | 1981-01-16 | 1982-09-02 | Rekord Heizungs- u. Klimageräte Ruckelshausen GmbH u. Co KG, 6102 Pfungstadt | Enamelling process for closed vessels |
-
1994
- 1994-05-28 DE DE59403711T patent/DE59403711D1/en not_active Expired - Lifetime
- 1994-05-28 EP EP94108272A patent/EP0640697B1/en not_active Expired - Lifetime
- 1994-05-28 AT AT94108272T patent/ATE156869T1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE59403711D1 (en) | 1997-09-18 |
| ATE156869T1 (en) | 1997-08-15 |
| EP0640697A1 (en) | 1995-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0640697B1 (en) | Water tank and procedure for its fabrication | |
| DE3519438A1 (en) | CORROSION PROTECTION METHOD FOR A STEAM GENERATOR TUBE AND DEVICE FOR CARRYING OUT THIS METHOD | |
| DE19515425C2 (en) | Enamelled storage container for a water storage device and method for its production | |
| DE4319113C1 (en) | Internally enamelled water storage tank | |
| DE102018005065B4 (en) | DECORATIVE OBJECT WITH RUST COATING | |
| DE3048180C2 (en) | Method for providing a metal object with a protective layer | |
| DE3408206C2 (en) | ||
| DE3535752C2 (en) | ||
| DE3123079C2 (en) | ||
| DE102019105988A1 (en) | Energy storage cell, energy storage and method for producing an energy storage cell | |
| DE2558575C3 (en) | Thermocouple and method of manufacture | |
| DE2908574A1 (en) | DEVICE FOR ELECTRIC RESISTANCE WELDING | |
| DE69305305T2 (en) | Container with inner shell made of polymer material | |
| EP0841460B1 (en) | Roller shutter box | |
| DE19502992A1 (en) | Process for producing hollow bodies and hollow bodies according to this method | |
| DE3239813A1 (en) | Heat exchanger | |
| AT129047B (en) | Battery cans for electric dry batteries. | |
| DE3112154A1 (en) | "TREATMENT CONTAINER WITH CONTAINER COVER DESIGNED AS A HEAT EXCHANGER" | |
| DE267775C (en) | ||
| AT158112B (en) | Method and device for the production of containers made of paper, cardboard and the like. Like. And container produced by this method. | |
| DE346041C (en) | ||
| DE2109628B2 (en) | DOMESTIC WATER HEATER | |
| DE2845242C2 (en) | Cover for a primary element, as well as the primary element provided therewith | |
| AT252278B (en) | Electrical conductor and process for its manufacture | |
| DE673239C (en) | Heating device, especially for tins |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE |
|
| 17P | Request for examination filed |
Effective date: 19950720 |
|
| K1C3 | Correction of patent application (complete document) published |
Effective date: 19950301 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| 17Q | First examination report despatched |
Effective date: 19960722 |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VAILLANT GMBH Owner name: VAILLANT B.V. Owner name: VAILLANT LTD. Owner name: VAILLANT GES.M.B.H Owner name: VAILLANT S.A.R.L Owner name: N.V. VAILLANT S.A. Owner name: JOH. VAILLANT GMBH U. CO. |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19970813 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19970813 Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19970813 |
|
| REF | Corresponds to: |
Ref document number: 156869 Country of ref document: AT Date of ref document: 19970815 Kind code of ref document: T |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REF | Corresponds to: |
Ref document number: 59403711 Country of ref document: DE Date of ref document: 19970918 |
|
| ITF | It: translation for a ep patent filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19971113 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Effective date: 19971118 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19971110 |
|
| ET | Fr: translation filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980528 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980605 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D Ref document number: 75813 Country of ref document: IE |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20050509 Year of fee payment: 12 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060531 |
|
| BERE | Be: lapsed |
Owner name: *VAILLANT G.M.B.H. Effective date: 20060531 Owner name: *VAILLANT B.V. Effective date: 20060531 Owner name: *VAILLANT LTD Effective date: 20060531 Owner name: *VAILLANT G.M.B.H Effective date: 20060531 Owner name: *VAILLANT S.A.R.L Effective date: 20060531 Owner name: S.A. *VAILLANT N.V. Effective date: 20060531 Owner name: JOH. *VAILLANT G.M.B.H. U. CO. Effective date: 20060531 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100528 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20120412 Year of fee payment: 19 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20130513 Year of fee payment: 20 Ref country code: DE Payment date: 20130509 Year of fee payment: 20 Ref country code: GB Payment date: 20130429 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20130605 Year of fee payment: 20 Ref country code: NL Payment date: 20130507 Year of fee payment: 20 Ref country code: IT Payment date: 20130524 Year of fee payment: 20 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59403711 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: NL Ref legal event code: V4 Effective date: 20140528 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20140527 |
|
| REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK07 Ref document number: 156869 Country of ref document: AT Kind code of ref document: T Effective date: 20140528 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20140527 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20140529 |