EP1272793A2 - Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it - Google Patents

Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it

Info

Publication number
EP1272793A2
EP1272793A2 EP00958910A EP00958910A EP1272793A2 EP 1272793 A2 EP1272793 A2 EP 1272793A2 EP 00958910 A EP00958910 A EP 00958910A EP 00958910 A EP00958910 A EP 00958910A EP 1272793 A2 EP1272793 A2 EP 1272793A2
Authority
EP
European Patent Office
Prior art keywords
tank
metal
neck
metal tank
mouth opening
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.)
Withdrawn
Application number
EP00958910A
Other languages
German (de)
French (fr)
Inventor
Istvan Szöcs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from HU9902815A external-priority patent/HU9902815D0/en
Application filed by Individual filed Critical Individual
Priority claimed from HU0003389A external-priority patent/HU226046B1/en
Publication of EP1272793A2 publication Critical patent/EP1272793A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/12—Vessels not under pressure with provision for protection against corrosion, e.g. due to gaseous acid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/10—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for protection against corrosion, e.g. due to gaseous acid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/058—Size portable (<30 l)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0604—Liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0619—Single wall with two layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0305—Bosses, e.g. boss collars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2109—Moulding
    • F17C2209/2127—Moulding by blowing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/232—Manufacturing of particular parts or at special locations of walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/234—Manufacturing of particular parts or at special locations of closing end pieces, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0176—Solids and gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/013—Reducing manufacturing time or effort
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/05—Improving chemical properties
    • F17C2260/053—Reducing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/07—Applications for household use
    • F17C2270/0754—Fire extinguishers

Definitions

  • Tank especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it
  • the object of the invention is a tank, especially fire extinguisher cylinder, provided with inner corrosion protection, which tank has more efficient corrosion protection as compared with the known tanks due to its construction, as a result of which it can be used as a tank for fire extinguishers filled with especially aggressive material, e.g. fire foam solution composition.
  • the tank according to “the invention comprises a metal tank, preferably made of steel plate, and an inner surface made of corrosion-resistant material bordering the inner space of the tank.
  • Yet object of the invention is a process for producing " the "tank provided "with " this kind of inner corrosion protection, which process is simpler and cheaper than the known methods for similar purpose.
  • thermoplastic synthetic powder is brought into the metal tank, usually made of steel plate, the powder in the tank is fused via heating the tank, nowadays via induction heating of the tank, and the inner surface of the tank is covered with the fuse via moving the tank.
  • the tank cools down the fuse solidifies and forms a protective coating adhering to the inner surface of the tank.
  • the continuity and the homogeneity of the protective coating is checked by high tension combed sounding electrode.
  • the disadvantage of this solution is that, in order to achieve the required adhesion of the protective coating, pre-treatment of the inner surface of the tank is necessary, further, in spite of the automated manufacturing, the protective coating formed by this method is porous at certain places and its thickness is not uniform.
  • the tank is used, and the tank is filled with some aggressive, corrosive (acidic) material, e.g. fire foam composition, and it is stored in the tank for longer time, in certain cases stored under pressure, the material stored in the tank soaks through the pores and gets between the protective coating and the wall of the tank.
  • some aggressive, corrosive (acidic) material e.g. fire foam composition
  • the protective coating gradually gets off the wall of the tank, the filling material destroys the wall of the tank, damaging the tank this way, making it weaker, the material of the tank gets into solution and it changes the chemical composition of the solution, as a consequence of which the durability, efficiency and this way the serviceability of the fire foam solution composition changes. It is a further disadvantage of this solution that covering the tank using such a method requires an expensive apparatus.
  • liquid varnish especially phenol- formaldehyde varnish
  • the inner surface of the tank is covered with the liquid varnish via moving the tank, and the varnish is burned into the surface via heating the tank.
  • multicomponent synthetic resin is brought into the tank also in liquid form, and a protective coating is formed by the solidified synthetic resin via moving the tank.
  • a further common disadvantage of the presented methods is that the filling under overpressure in th-e tank locally getting between the protective coating and the wall of the tank can remove the protective coating from the wall of the tank when the overpressure in the inner space of the tank ceases, e.g. if it is a fire extinguisher, when it is used or discharged so as to be recharged for warranty or safety reasons, and this way the tank, e.g. the fire extinguisher, becomes unserviceable.
  • the corrosion resistance should not be achieved by a forming a protective coating adhering to the wall bordering the inner space of the tank, but the mechanical strength and pressure tightness required from such tanks and the requirement of resistance against aggressive fillings can only be met if producing a tank where these two requirements are separated, and the tank consists of two parts, one part meeting one requirement and the other part meeting the other.
  • the tank especially fire extinguisher cylinder, provided with inner corrosion protection being a solution for the problem according to the invention has a metal tank preferably made of steel plate and an inner surface made of corrosion resistant material bordering the inner space of the tank.
  • the essence of the tank is that the inner surface made of corrosion resistant material is the inner surface of an insertion tank made of thermoplastic synthetic material, which insertion tank seats to the inner surface of the metal tank and lines the mouth opening of the metal tank from the inside.
  • the material of the insertion tank is polyethylene terephtalate.
  • the insertion tank projects over the mouth opening of the metal tank and overlies the rim of the mouth opening.
  • the insertion tank suitably has a collar, with this collar the insertion tank fits to the rim of the mouth opening of the metal tank.
  • the metal tank has a neck extension piece welded to its mouth opening, which neck extension piece has a thread on its inner and/or outer surface.
  • the neck extension piece can be fixed to the metal tank by welding.
  • the metal tank has air channel (s) near its mouth opening leading to the free atmosphere.
  • the metal tank has ducts near its mouth opening, mainly groove (s) and/or hole(s) forming the air channel.
  • the assembly of the tank according to the invention is made easier with the embodiment where there is a threaded intermediate piece made of corrosion-resistant material connected to the neck via screw joint, in its screwed-on position the intermediate piece fits to the insertion tank. With this solution the section leading out from the inner space of the tank is prevented against corrosion. If the tank is used as a fire extinguisher cylinder the threaded intermediate piece has a threaded part to be connected to the valve mechanism ot the fire extinguisher via screw joint.
  • the thread can be either internal or external.
  • the threaded intermediate piece in its position connected to the neck via screw joint, forms a sealed joint to the insertion tank.
  • the threaded intermediate piece closes the channels leading to the free atmosphere .
  • Another object of the invention is a process for producing tanks, especially fire extinguisher cylinders, provided with inner corrosion protection.
  • the essential idea of the process is that a pre-product, mainly female pre-product, made of thermoplastic synthetic material, is inserted in the internal space of the metal tank, especially made of steel plate, joining at least to a part of the mouth opening "fro the inside, while, if necessary, we leave air channels leading from the inner space of the metal tank to the free atmosphere, we ensure the required deformation temperature for the pre-product, and using the metal tank as a mould, the pre-product is formed to be an insertion tank via blow moulding applying the method known in itself, and than the insertion tank is left in the metal tank.
  • thermoplastic synthetic material is made of polyethylene terephtalate.
  • pre-product in certain references they use the phrase "pre-form”.
  • Figure 1 is a sectional view of a tank according to the invention, the dashed line showing the position of the pre-product at the beginning of the production process,
  • Figure 2 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck piece with internal thread
  • Figure 3 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with external thread
  • Figure 4 is a magnified sectional view of a part of the tank shown in figure 3,
  • Figure 5 is a detail of the sectional view of an embodiment of the tank according to the invention with a sleeve insert with an internal thread
  • Figure 6 is a detail of the sectional view of another embodiment of the tank according to the invention with a sleeve insert with an internal thread
  • Figure 7 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with an internal thread
  • Figure 8 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with internal thread and with a sleeve insert,
  • Figure 9 is a detail of the sectional view of another embodiment of the tank according to the invention with a neck extension piece with internal thread and with an intermediate piece.
  • the tank 10 is to be used as the cylinder of a 3 kg fire extinguisher has a metal tank 20 and an insertion tank 30 seating to the inner surface of the metal tank 20.
  • the metal tank 20 is usually made from steel sheet plate, while the material of the insertion tank 30 is polyethylene terephtalate, which is a thermoplastic synthetic material.
  • the outer surface of the tank 10 the outer surface 21 of the metal tank 20, while the inner surface of the tank 10 is the inner surface 31 of the insertion tank 30, which is resistant to aggressive agents due to its material.
  • the outer surface of the insertion tank 30 is seating to the inner surface of the metal tank 20, the neck part of the insertion tank 30 projects over, lining the mouth opening and the neck of the metal tank from the inside, and its collar 32 overlies the rim 22 of the mouth opening of the metal tank 20.
  • dashed line indicates in the figure the pre-product 15, and the position of it in relation to the metal tank 20, which pre-product 15 will be used for forming the insertion tank 30 as an insert for the metal tank 20.
  • Figure 2 shows the sectional view of an embodiment of the tank 10, where the wall of the neck part 33 of the insertion tank 30 is thicker than that of the other parts, and there is a thread 34 formed in this part with thicker wall, to which the valve of the fire extinguisher (not indicated in the figure) can be connected via screw joint directly or with a threaded intermediate piece inserted.
  • the valve of the fire extinguisher (not indicated in the figure) can be connected via screw joint directly or with a threaded intermediate piece inserted.
  • FIG. 3 shows a detail of the sectional view of an embodiment of the tank 10 with a neck extension piece 41 with external thread.
  • a neck extension piece 41 is mounted by welding to the neck of the metal tank 20 part of the tank 10.
  • the insertion tank 30 projects over the mouth opening of the metal tank 20 and the neck extension piece 41, and with its collar 32 it overlies the free-standing end surface of the neck extension piece 41.
  • This embodiment can be assembled with suitable valve with internal thread or intermediate piece, and it can be seen that in the assembled position the corrosive agent flowing out from the tank 10 can contact the wall of neither the metal tank 20 nor the neck extension piece 41 at any place, this way the protection of the tank 10 against corrosion is ensured, hence it can be safely filled several times, and can be used for a long time.
  • dashed line indicates the initial position of the pre-product 15 in this figure, too.
  • FIG. 5 shows a detail of the sectional view of an embodiment of the tank with a sleeve insert with an internal thread.
  • the insertion tank 30 projects over the mouth opening of the metal tank 20, and with its collar 32 it fits to the rim 22 of the mouth opening of the metal tank 20.
  • the tank 10 has a sleeve insert 45 made of corrosion resistant material, at this embodiment it is made of copper, situated in the mouth opening lined with the neck part of the insertion tank 30.
  • the sleeve insert 45 is prevented from displacement in the opening partly by the solution that its end 47 penetrating in the inner space of the tank 10 is bent so as to bear up to the neck part of the tank, and partly by the solution that the rim on the other end 48 fits to the collar 32 of the insertion tank 30.
  • the sleeve insert 45 is provided with internal thread 49, a valve can be connected to it directly or with an intermediate piece inserted.
  • Figure 6 shows a detail of the sectional view of another embodiment of the tank 10 with a sleeve insert 50 with internal thread. It can. be seen in. the figure that the insertion tank 30 projects over the mouth opening of the metal tank 20, and with its collar 32 it fits to the rim 22 of the mouth opening of the metal tank 20.
  • the tank 10 has a sleeve insert 50 made of corrosion resistant material, it is made of copper at this embodiment, too.
  • the sleeve insert 50 has an external thread 51 on its curved surface and it also has an internal thread 52, and it is fixed in the thread 34 formed in the neck part of the insertion tank 30 via its external thread 51.
  • the screwed-in position of the sleeve insert 50 is limited by the butt on of the rim of the sleeve insert 50 on its outer end 53 on the collar 32 of the insertion tank 30.
  • the sleeve insert 50 is provided with internal thread 54, a valve can be connected to the tank 10 directly or with an intermediate piece inserted.- It can be seen at this embodiment as well that in the position assembled with the valve the corrosive agent flowing out from the tank 10 can contact only surfaces made of corrosion resistant material.
  • Figure 7 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with an internal thread.
  • a neck ring 25 fixed to the neck of the metal tank 20 by welding so as to increase mechanical strength.
  • a groove 27 running around the outer surface of the neck ring 25.
  • the insertion tank 30 joins the inner surface of the metal tank 20 and the inner surface of the neck ring 25 welded to its neck, and it bears up on the rim of the neck ring 25 with its collar 32.
  • the neck extension piece 55 has a part provided with a thread 57 so as to be connected to a valve directly or with an intermediate piece inserted, and has a part embracing the neck ring 25 of the tank, and there is a groove running round in its curved surface.
  • its groove 5£ is positioned opposite to the groove 27 running around the outer curved surface of the neck ring 25, and the two grooves together form a groove for snap ring 60.
  • neck extension piece 55 slid on the curved surface -of the neck ring 25, and there is a grove 56 in the inner surface of the neck extension piece 55. It can be seen at this embodiment as well that the corrosive agent flowing out from the tank can contact only surfaces made of corrosion resistant material.
  • Figure 8 shows a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece 65 with internal thread connected to the metal tank 20 by welding and with a sleeve insert 70 with internal and external thread.
  • the insertion tank 30 fits to the shoulder 67 formed in the internal surface of the neck extension piece 65 with internal thread connected to the mouth of the metal tank 20 by welding, in which position it is fixed by the sleeve insert 70 made of corrosion resistant material connected to the thread of the neck extension piece 65 with its external thread.
  • the internal thread 72 of the sleeve insert 70 is suitable for connecting and fixing a valve to the tank directly or with an intermediate piece inserted.
  • the insertion tank projects over the mouth opening of the metal tank and its collar overlies the rim o ⁇ the mouth opening.
  • the valve mechanism is screwed in the intermediate piece, this way it is ensured that when the filling flows out, it will not contact unprotected surface of the tank.
  • a pre-product 12 is placed on the mouth opening of the metal tank 20 projecting in the inner space of the metal tank 20.
  • the fitted position is indicated with dashed line in figures 1 and 3.
  • the deformation temperature required tor the plastic shaping of the pre-product is ensured as occasion requires, either by pre-heating or by any other known method, and the moulding is realised by the known method via blow moulding using moulding gas, preferably moulding air, using the metal tank as a mould.
  • moulding gas preferably moulding air
  • Figure 4 shows the grove 28 acting as air channel and the hole 29 leading from the middle of the groove to the free atmosphere applied at the embodiment shown in figure 3, through which the air remained in the neck part of the metal tank can exit when the insertion tank is blew.
  • the tank according to the invention meets the specified requirements in full.
  • the metal tank part ot the tank is acting as a mould for the insertion tank, the insertion tank somewhat lays out the metal tank via bearing up on the inner surface of the wall of the metal tank acting as its place of application, the metal tank acts only as a part of " the tank according to the invention providing the required mechanical strength and pressure tightness, while the insertion tank acts as a part separating the material filled in the tank from the wall of the metal tank, preventing the wall of the metal tank from contacting the filling, that is, providing the required corrosion protection.
  • the major advantage of the tank provided with inner corrosion protection according to the invention is that it has a void-free, continuous protective surface resistant to corrosion to the required extent depending on the material of the insertion tank. It is a further advantage of the tank that the insertion tank providing the corrosion protection can be manufactured easily, economically, with low material costs and short technological time, there is no need for moulder's tools in the course of the manufacturing as it is the metal tank itself, and there is no need for unnecessary energy either. It is a further significant advantage that the part of the tank providing the corrosion protection can be repaired without damaging the other part of the tank or its outside paint coat, and similarly, the outer part of the tank can be renewed without damaging the part of the tank providing the corrosion protection or without causing any change in its quality.
  • the insertion tank providing the corrosion protection can be formed even after the tank has been painted and/or the paint coat has been burned in the surface.

Landscapes

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

Abstract

Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, having a metal tank, preferably a metal tank made of steel plate and an inner surface made of corrosion resistant material bordering the inner space of the tank, the inner surface made of corrosion resistant material is the inner surface of an insertion tank made of thermoplastic synthetic material, especially polyethylene terephthalate, which insertion tank seats to the inner surface of the metal tank and lines the mouth opening of the metal tank.

Description

Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it
The object of the invention is a tank, especially fire extinguisher cylinder, provided with inner corrosion protection, which tank has more efficient corrosion protection as compared with the known tanks due to its construction, as a result of which it can be used as a tank for fire extinguishers filled with especially aggressive material, e.g. fire foam solution composition. The tank according to "the invention comprises a metal tank, preferably made of steel plate, and an inner surface made of corrosion-resistant material bordering the inner space of the tank. /Another object of the invention is a process for producing "the "tank provided "with "this kind of inner corrosion protection, which process is simpler and cheaper than the known methods for similar purpose.
There are several methods for inner corrosion protection of tanks. At a widespread solution used with metal tanks of 0.5 - 100 litres, especially tanks used with fire extinguishers, thermoplastic synthetic powder is brought into the metal tank, usually made of steel plate, the powder in the tank is fused via heating the tank, lately via induction heating of the tank, and the inner surface of the tank is covered with the fuse via moving the tank. When the tank cools down the fuse solidifies and forms a protective coating adhering to the inner surface of the tank. The continuity and the homogeneity of the protective coating is checked by high tension combed sounding electrode. In addition to the fact that an expensive moving device is requixed so as to move the tank, the disadvantage of this solution is that, in order to achieve the required adhesion of the protective coating, pre-treatment of the inner surface of the tank is necessary, further, in spite of the automated manufacturing, the protective coating formed by this method is porous at certain places and its thickness is not uniform. As a result, when the tank is used, and the tank is filled with some aggressive, corrosive (acidic) material, e.g. fire foam composition, and it is stored in the tank for longer time, in certain cases stored under pressure, the material stored in the tank soaks through the pores and gets between the protective coating and the wall of the tank. As a result, the protective coating gradually gets off the wall of the tank, the filling material destroys the wall of the tank, damaging the tank this way, making it weaker, the material of the tank gets into solution and it changes the chemical composition of the solution, as a consequence of which the durability, efficiency and this way the serviceability of the fire foam solution composition changes. It is a further disadvantage of this solution that covering the tank using such a method requires an expensive apparatus.
At a second solution liquid varnish, especially phenol- formaldehyde varnish, is brought into the inner space of the tank, and the inner surface of the tank is covered with the liquid varnish via moving the tank, and the varnish is burned into the surface via heating the tank. At a third solution multicomponent synthetic resin is brought into the tank also in liquid form, and a protective coating is formed by the solidified synthetic resin via moving the tank. A common disadvantage of these solutions is that the technological time required for producing the protective coating is long, which makes the manufacturing expensive, and further, expensive special machines are required for supplying and for moving the tank. A further common disadvantage of the presented methods is that the filling under overpressure in th-e tank locally getting between the protective coating and the wall of the tank can remove the protective coating from the wall of the tank when the overpressure in the inner space of the tank ceases, e.g. if it is a fire extinguisher, when it is used or discharged so as to be recharged for warranty or safety reasons, and this way the tank, e.g. the fire extinguisher, becomes unserviceable.
It is a further common disadvantage that in every case the entire mass of the tank must be warmed or heated to a certain temperature so as to produce the protective coating, which, taking into consideration that the tank must be cooled or let cooled down after the protective coating has been formed, requires significant unnecessary use of energy.
It is a further significant disadvantage especially with tanks to be used for long period of time, e.g. fire extinguishers, that if the tank is repainted in the course of a reg-eneration, which usually requires burning down the outside paint coat, the inner protective coating is also damaged, and it can only be renewed by producing a new protective coating using the original production machine, it can not be reproduced subsequently.
The disadvantages of the above described solutions made it necessary to develop a tank which is not only of the required mechanical strength and pressure tightness, but has a reliable corrosion protection and can be produced in a simple, easy, cheap and economic way. It was a further requirement to develop a construction where, if supplied with a suitable intermediate piece, it can be ensured that if the tank is connected to a unit, e.g. a valve, the filling can not contact the less corrosion resistant surface of the tank -even when flowing out from the tank, and this way a continuous corrosion-protected surface is achieved, and further, the tank can keep t e high pressure for a long period of time.
When developing the invention we started out from the fact that the problem with the above described tanks and the production method thereof is how to solve the adherence of the protective coating to the internal surface of the tank made of steel, and that the disadvantages of the known solutions originate from the fact that the imporosity and the adherence of the protective coating are not satisfactory. The fundamental idea of the invention is that the corrosion resistance should not be achieved by a forming a protective coating adhering to the wall bordering the inner space of the tank, but the mechanical strength and pressure tightness required from such tanks and the requirement of resistance against aggressive fillings can only be met if producing a tank where these two requirements are separated, and the tank consists of two parts, one part meeting one requirement and the other part meeting the other.
Therefore the tank, especially fire extinguisher cylinder, provided with inner corrosion protection being a solution for the problem according to the invention has a metal tank preferably made of steel plate and an inner surface made of corrosion resistant material bordering the inner space of the tank. The essence of the tank is that the inner surface made of corrosion resistant material is the inner surface of an insertion tank made of thermoplastic synthetic material, which insertion tank seats to the inner surface of the metal tank and lines the mouth opening of the metal tank from the inside.
At a preferred embodiment of the invention the material of the insertion tank is polyethylene terephtalate.
At a preferable embodiment of the tank the insertion tank projects over the mouth opening of the metal tank and overlies the rim of the mouth opening. The insertion tank suitably has a collar, with this collar the insertion tank fits to the rim of the mouth opening of the metal tank.
At another preferable embodiment the metal tank has a neck extension piece welded to its mouth opening, which neck extension piece has a thread on its inner and/or outer surface. The neck extension piece can be fixed to the metal tank by welding.
At an advantageous embodiment of the tank the metal tank has air channel (s) near its mouth opening leading to the free atmosphere.
At another preferable embodiment the metal tank has ducts near its mouth opening, mainly groove (s) and/or hole(s) forming the air channel.
It is a very favourable embodiment where there is (are) hole(s) in the wall of the metal tank, preferably in the arched part of the wall, leading to the free atmosphere.
The assembly of the tank according to the invention is made easier with the embodiment where there is a threaded intermediate piece made of corrosion-resistant material connected to the neck via screw joint, in its screwed-on position the intermediate piece fits to the insertion tank. With this solution the section leading out from the inner space of the tank is prevented against corrosion. If the tank is used as a fire extinguisher cylinder the threaded intermediate piece has a threaded part to be connected to the valve mechanism ot the fire extinguisher via screw joint. The thread can be either internal or external.
It is an especially favourable embodiment where, in its position connected to the neck via screw joint, the threaded intermediate piece forms a sealed joint to the insertion tank. At this embodiment, in its position connected to the neck extension piece via screw joint, the threaded intermediate piece closes the channels leading to the free atmosphere .
Another object of the invention is a process for producing tanks, especially fire extinguisher cylinders, provided with inner corrosion protection. The essential idea of the process is that a pre-product, mainly female pre-product, made of thermoplastic synthetic material, is inserted in the internal space of the metal tank, especially made of steel plate, joining at least to a part of the mouth opening "fro the inside, while, if necessary, we leave air channels leading from the inner space of the metal tank to the free atmosphere, we ensure the required deformation temperature for the pre-product, and using the metal tank as a mould, the pre-product is formed to be an insertion tank via blow moulding applying the method known in itself, and than the insertion tank is left in the metal tank.
At a favourable realisation of the process the pre-product made of thermoplastic synthetic material is made of polyethylene terephtalate. We note that instead of the phrase "pre-product", in certain references they use the phrase "pre-form".
In what follows, the essence of the invention is described in detail by presenting its favourable embodiments, used for fire extinguishers as an example, with reference to the accompanying drawings in which:
Figure 1 is a sectional view of a tank according to the invention, the dashed line showing the position of the pre-product at the beginning of the production process,
Figure 2 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck piece with internal thread,
Figure 3 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with external thread,
Figure 4 is a magnified sectional view of a part of the tank shown in figure 3,
Figure 5 is a detail of the sectional view of an embodiment of the tank according to the invention with a sleeve insert with an internal thread,
Figure 6 is a detail of the sectional view of another embodiment of the tank according to the invention with a sleeve insert with an internal thread, Figure 7 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with an internal thread,
Figure 8 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with internal thread and with a sleeve insert,
Figure 9 is a detail of the sectional view of another embodiment of the tank according to the invention with a neck extension piece with internal thread and with an intermediate piece.
It can be seen in figure 1 that at this embodiment shown as an example the tank 10 is to be used as the cylinder of a 3 kg fire extinguisher has a metal tank 20 and an insertion tank 30 seating to the inner surface of the metal tank 20. The metal tank 20 is usually made from steel sheet plate, while the material of the insertion tank 30 is polyethylene terephtalate, which is a thermoplastic synthetic material. The outer surface of the tank 10 the outer surface 21 of the metal tank 20, while the inner surface of the tank 10 is the inner surface 31 of the insertion tank 30, which is resistant to aggressive agents due to its material. The outer surface of the insertion tank 30 is seating to the inner surface of the metal tank 20, the neck part of the insertion tank 30 projects over, lining the mouth opening and the neck of the metal tank from the inside, and its collar 32 overlies the rim 22 of the mouth opening of the metal tank 20. This way the two tanks form a unit that can not be detached without being damaged, where the required mechanical strength and pressure tightness is ensured by the metal tank 20, while the insertion tank 30 connected to it in tight fit practically acts as only the corrosion protection layer for the metal tank 20. For the sake of the description of the production process to be discussed later, dashed line indicates in the figure the pre-product 15, and the position of it in relation to the metal tank 20, which pre-product 15 will be used for forming the insertion tank 30 as an insert for the metal tank 20.
Figure 2 shows the sectional view of an embodiment of the tank 10, where the wall of the neck part 33 of the insertion tank 30 is thicker than that of the other parts, and there is a thread 34 formed in this part with thicker wall, to which the valve of the fire extinguisher (not indicated in the figure) can be connected via screw joint directly or with a threaded intermediate piece inserted. It can clearly be seen in the figure that if a valve or an intermediate piece is screwed into the thread 34, its edge bears up on the collar 32 of the insertion tank 30, this way the corrosive medium, e.g. corrosive fire foam solution, stored in tank 10, can have no contact with the metal tank 20, neither in the disused position of the tank 10, nor when flowing out from the tank 10.
Figure 3 shows a detail of the sectional view of an embodiment of the tank 10 with a neck extension piece 41 with external thread. A neck extension piece 41 is mounted by welding to the neck of the metal tank 20 part of the tank 10. There is a thread 42 formed on the curved surface of the neck extension piece 41, a valve can be connected to the tank 10 using it. It can be clearly seen in the figure that the insertion tank 30 projects over the mouth opening of the metal tank 20 and the neck extension piece 41, and with its collar 32 it overlies the free-standing end surface of the neck extension piece 41. This embodiment can be assembled with suitable valve with internal thread or intermediate piece, and it can be seen that in the assembled position the corrosive agent flowing out from the tank 10 can contact the wall of neither the metal tank 20 nor the neck extension piece 41 at any place, this way the protection of the tank 10 against corrosion is ensured, hence it can be safely filled several times, and can be used for a long time. For the sake of the description of the production process to be discussed later, dashed line indicates the initial position of the pre-product 15 in this figure, too.
Figure 5 shows a detail of the sectional view of an embodiment of the tank with a sleeve insert with an internal thread. As it can be seen in the figure, the insertion tank 30 projects over the mouth opening of the metal tank 20, and with its collar 32 it fits to the rim 22 of the mouth opening of the metal tank 20. The tank 10 has a sleeve insert 45 made of corrosion resistant material, at this embodiment it is made of copper, situated in the mouth opening lined with the neck part of the insertion tank 30. The sleeve insert 45 is prevented from displacement in the opening partly by the solution that its end 47 penetrating in the inner space of the tank 10 is bent so as to bear up to the neck part of the tank, and partly by the solution that the rim on the other end 48 fits to the collar 32 of the insertion tank 30. The sleeve insert 45 is provided with internal thread 49, a valve can be connected to it directly or with an intermediate piece inserted.
Figure 6 shows a detail of the sectional view of another embodiment of the tank 10 with a sleeve insert 50 with internal thread. It can. be seen in. the figure that the insertion tank 30 projects over the mouth opening of the metal tank 20, and with its collar 32 it fits to the rim 22 of the mouth opening of the metal tank 20. The tank 10 has a sleeve insert 50 made of corrosion resistant material, it is made of copper at this embodiment, too. The sleeve insert 50 has an external thread 51 on its curved surface and it also has an internal thread 52, and it is fixed in the thread 34 formed in the neck part of the insertion tank 30 via its external thread 51. The screwed-in position of the sleeve insert 50 is limited by the butt on of the rim of the sleeve insert 50 on its outer end 53 on the collar 32 of the insertion tank 30. The sleeve insert 50 is provided with internal thread 54, a valve can be connected to the tank 10 directly or with an intermediate piece inserted.- It can be seen at this embodiment as well that in the position assembled with the valve the corrosive agent flowing out from the tank 10 can contact only surfaces made of corrosion resistant material.
Figure 7 is a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece with an internal thread. As it can be seen in the figure, there is a neck ring 25 fixed to the neck of the metal tank 20 by welding so as to increase mechanical strength. There is a groove 27 running around the outer surface of the neck ring 25. The insertion tank 30 joins the inner surface of the metal tank 20 and the inner surface of the neck ring 25 welded to its neck, and it bears up on the rim of the neck ring 25 with its collar 32. At this embodiment the neck extension piece 55 has a part provided with a thread 57 so as to be connected to a valve directly or with an intermediate piece inserted, and has a part embracing the neck ring 25 of the tank, and there is a groove running round in its curved surface. In the position of the neck extension piece 55 fitted on the tank its groove 5£ is positioned opposite to the groove 27 running around the outer curved surface of the neck ring 25, and the two grooves together form a groove for snap ring 60. When it is assembled with the snap ring 60, the snap ring 60 fitting into the grooves lying opposite to each other fixes the neck extension piece 55 in its position slid on the tank.
There is a neck extension piece 55 slid on the curved surface -of the neck ring 25, and there is a grove 56 in the inner surface of the neck extension piece 55. It can be seen at this embodiment as well that the corrosive agent flowing out from the tank can contact only surfaces made of corrosion resistant material.
Figure 8 shows a detail of the sectional view of an embodiment of the tank according to the invention with a neck extension piece 65 with internal thread connected to the metal tank 20 by welding and with a sleeve insert 70 with internal and external thread. The insertion tank 30 fits to the shoulder 67 formed in the internal surface of the neck extension piece 65 with internal thread connected to the mouth of the metal tank 20 by welding, in which position it is fixed by the sleeve insert 70 made of corrosion resistant material connected to the thread of the neck extension piece 65 with its external thread. At the presented embodiment there is a gasket ring 78 in the surface of the sleeve insert 70 facing the tank suitable for sealing the position of the sleeve insert 70 in its position connected to the tank. The internal thread 72 of the sleeve insert 70 is suitable for connecting and fixing a valve to the tank directly or with an intermediate piece inserted. At the tank shown in figure 9 the insertion tank projects over the mouth opening of the metal tank and its collar overlies the rim oϋ the mouth opening. There is a neck extension piece with internal thread welded on the month opening of the metal tank, which neck extension piece surrounds the collar of the insertion tank, there is an intermediate piece with internal and external thread screwed in the neck extension piece, and the hole in the intermediate piece is opening into the mouth opening of the insertion tank. The valve mechanism is screwed in the intermediate piece, this way it is ensured that when the filling flows out, it will not contact unprotected surface of the tank.
In the course of the favourable production process of the tank according to the invention a pre-product 12 is placed on the mouth opening of the metal tank 20 projecting in the inner space of the metal tank 20. The fitted position is indicated with dashed line in figures 1 and 3. The deformation temperature required tor the plastic shaping of the pre-product is ensured as occasion requires, either by pre-heating or by any other known method, and the moulding is realised by the known method via blow moulding using moulding gas, preferably moulding air, using the metal tank as a mould. When the pre-product is inflating, it reaches the wall at the middle of the metal tank first, and it approaches the shoulder and the neck part afterwards. In order to ensure that no air should remain in the shoulder and the neck of the metal tank used as mould hindering the insertion tank to take its final shape, air channels and holes leading to the free atmosphere are formed in the metal tank. Figure 4 shows the grove 28 acting as air channel and the hole 29 leading from the middle of the groove to the free atmosphere applied at the embodiment shown in figure 3, through which the air remained in the neck part of the metal tank can exit when the insertion tank is blew.
We let the insertion tank blew to the required size using the metal tank as a mould cool down in the metal tank, or, if it is necessary, it can be cooled down by the known methods ,
The tank according to the invention meets the specified requirements in full. The metal tank part ot the tank is acting as a mould for the insertion tank, the insertion tank somewhat lays out the metal tank via bearing up on the inner surface of the wall of the metal tank acting as its place of application, the metal tank acts only as a part of" the tank according to the invention providing the required mechanical strength and pressure tightness, while the insertion tank acts as a part separating the material filled in the tank from the wall of the metal tank, preventing the wall of the metal tank from contacting the filling, that is, providing the required corrosion protection. This way there is no requirement for corrosion resistance of the metal tank, and there is no requirement for mechanical strength and pressure tightness of the insertion tank, so many kind of materials can be chosen as material of these tanks, always adjusted to be the best for the given purpose.
The major advantage of the tank provided with inner corrosion protection according to the invention is that it has a void-free, continuous protective surface resistant to corrosion to the required extent depending on the material of the insertion tank. It is a further advantage of the tank that the insertion tank providing the corrosion protection can be manufactured easily, economically, with low material costs and short technological time, there is no need for moulder's tools in the course of the manufacturing as it is the metal tank itself, and there is no need for unnecessary energy either. It is a further significant advantage that the part of the tank providing the corrosion protection can be repaired without damaging the other part of the tank or its outside paint coat, and similarly, the outer part of the tank can be renewed without damaging the part of the tank providing the corrosion protection or without causing any change in its quality.
It is a further advantage that the insertion tank providing the corrosion protection can be formed even after the tank has been painted and/or the paint coat has been burned in the surface.

Claims

CLAIMS :
1. Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, having a metal tank, preferably a metal tank made of steel plate and an inner surface made of corrosion resistant material bordering the inner space of the tank, ch a r a ct er i s e d in t h at the inner surface made of corrosion resistant material is the inner surface of an insertion taτik made of thermoplastic synthetic material, which insertion tank seats to the inner surface of the metal tank and lines the mouth opening of the metal tank.
2. Tank according to claim 1 ch a r a ct eri s e d i n tha t the material of the insertion tank is polyethylene terephtalate.
3. Tank according to claim 1 or claim 2 c h a r a c te r i s e d i n t h a t the insertion tank projects over the mouth opening of the metal tank and overlies the rim of the mouth opening.
4. Tank according to any of claims 1 - 3 ch a ra c t e r i s e d i n tha t the insertion tank fits to the rim of the mouth opening of the metal tank with its collar.
5. Tank according to any of claims 1 - 4 ch a r a c t e r i s e d i n th a t tne metal tank has a neck extension piece welded to its mouth opening.
6. Tank according to any of claims 1 - 5 cha r ac t e r i s e d i n t h a t there is an inner thread in the neck part of the insertion tank.
7. Tank according to any of claims 1 - 6 cha racte r ised i n t hat the metal tank has a neck extension piece and an external thread on it.
8. Tank according to any of claims 1 - 6 char a ct eri s e d in that the metal tank has an external thread on its neck part.
9. Tank according to any of claims 1 - 8 cha r a c t e r i s e d in tha t the metal tank has vent holets) in the wall of its neck part and/or its shoulder and/or its bottom part and/or its neck extension piece leading to the free atmosphere.
10. Tank according to any of claims 1 - 9 cha r a c t e r ise d in t h at it has a threaded intermediate piece made of corrosion-resistant material connected to the neck extension piece or to a sleeve insert via screw joint, and in its screwed-on position the intermediate piece fits to the insertion tank.
11. Tank according to any of claims 1 - 10 cha r ac t e r i s e d i n tha t it has air channel (s), suitably groove (s), in the wall of the metal tank and/or the neck extension piece, leading to the vent hole (s) .
12. Tank according to any of claims 1 - 11 cha-r a c t e r i s ed i n t h a t the threaded intermediate piece has a threaded part to be connected to the valve mechanism via screw joint.
13. Tank according to any of claims 1 - 12 ch a r a c t e r i s e d i n th a t in the position of the threaded intermediate piece connected to the neck via screw joint, the threaded intermediate piece forms a sealed joint to the insertion tank.
14. Tank according to any of claims 1 - 13 ch a r a c te r i s e d i n t ha t in its position connected to the neck via screw joint, the threaded intermediate piece closes the channels leading to the free atmosphere.
15. Tank according to any of claims 1 - 14 ch a r a c t e r i s e d i n t h a t the insertion tank projects over the mouth opening of the metal tank and its collar overlies the rim of the mouth opening, and there is a neck extension piece with internal thread welded on the month opening of the metal tank, which neck extension piece surrounds the collar of the insertion tank, there is an intermediate piece with internal and external thread screwed in the neck extension piece, and the hole in the intermediate piece is opening into the mouth opening of the insertion tank.
16. Process for producing tanks, especially tanks according to any of claims 1-15, mainly fire extinguisher cylinders, provided with inner corrosion protection, c h a r a c t er is ed in t h. a t a pre-product made of thermoplastic synthetic material is inserted in the internal space of a metal tank, especially metal tank made of steel plate, fitting at least to a part of the mouth opening of the metal tank from the inside, while leaving air channels leading from the inner space of the metal tank to the free atmosphere, the required deformation temperature for the pre-product is ensured, and using the metal tank as a mould, the pre-product is formed to be an insertion tank via blow moulding using moulding gas, preferably moulding air, applying the method known in itself, and than the insertion tank is left in the metal tank and let cooled down, or it. is cooled down using a method known in itself.
17. Process according to claim 16 ch a r a c te r i s e d i n tha t the pre-product made of thermoplastic synthetic material is a pre-product made of polyethylene terephtalate.
EP00958910A 1999-08-24 2000-08-24 Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it Withdrawn EP1272793A2 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
HU9902815A HU9902815D0 (en) 1999-08-24 1999-08-24 Container provided inner corrosion protection, mainly fire-extinguisher and process for production thereof
HU9902815P 1999-08-24
PCT/HU2000/000092 WO2001014212A2 (en) 1999-08-24 2000-08-24 Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it
HU0003389P 2000-08-24
HU0003389A HU226046B1 (en) 2000-08-24 2000-08-24 Tank, especially fire extinguisher cylinder, provided with inner corrosion protection and process for producing it

Publications (1)

Publication Number Publication Date
EP1272793A2 true EP1272793A2 (en) 2003-01-08

Family

ID=89999074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958910A Withdrawn EP1272793A2 (en) 1999-08-24 2000-08-24 Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it

Country Status (3)

Country Link
EP (1) EP1272793A2 (en)
AU (1) AU7031800A (en)
WO (1) WO2001014212A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1019794A5 (en) 2011-07-12 2012-12-04 Covess N V METHOD FOR MANUFACTURING PRESSURE-RESISTANT GAS AND / OR LIQUID-PROOF RECIPIENTS.
GB0425682D0 (en) * 2004-11-23 2004-12-22 Carr Roger Fire extinguisher with an integrally sealed unit
EP1658883A1 (en) * 2004-11-23 2006-05-24 Roger Carr Fire extinguisher with an integrally sealed unit
RU2460557C1 (en) * 2011-02-01 2012-09-10 Открытое акционерное общество "Тамбовское опытно-конструкторское технологическое бюро" (ОАО "Тамбовское ОКТБ") Extinguisher
CN102788245A (en) * 2012-07-12 2012-11-21 南京航空航天大学 Corrosion-resisting fuel tank with double-layer structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907149A (en) * 1971-10-26 1975-09-23 Amalga Corp Pressure vessel having a sealed port
CH577658A5 (en) * 1975-02-18 1976-07-15 Famurano Anstalt Double skinned domestic hot water tank - has plastics inner skin inflated inside metal cylinder and neck secured around flange
DE2659112A1 (en) * 1976-12-28 1978-07-06 Hahn Metallbau Gmbh Portable fire extinguisher using foam - has metal body with synthetic resin internal lining and synthetic resin head to avoid corrosion (SW 5.12.77)
WO1989000658A1 (en) * 1987-07-13 1989-01-26 Interatom Gmbh Double-walled compressed gas cylinder
US5474846A (en) * 1993-01-26 1995-12-12 Haldenby; George A. Uniform polymeric coated interior cylinder surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0114212A3 *

Also Published As

Publication number Publication date
AU7031800A (en) 2001-03-19
WO2001014212A2 (en) 2001-03-01
WO2001014212A3 (en) 2001-11-22

Similar Documents

Publication Publication Date Title
RU142892U1 (en) HEAT-INSULATED PIPE AND A SEPARATE SECTION OF A PIPELINE WITH HYDRO-PROTECTION ON THE EXTERNAL SURFACE AND ON THE ENDS
CN102596621B (en) For the container of the fuel and/or engine operation raw material that hold vehicle
CN102168756B (en) Extruded tube welded vessel liner with injection molded end caps
US4548338A (en) Packing tube
NO176907B (en) Valve equipped pressure vessel of plastic
NZ225472A (en) Wound fibre-thermoplastics pressure vessel with interposed bonded metal end caps
US3370737A (en) Containers
EP1948462A1 (en) Fuel tank for vehicles
EP1272793A2 (en) Tank, especially fire extinguisher cylinder, provided with inner corrosion protection, and process for producing it
JP5741482B2 (en) Pressure vessel and method for manufacturing the same
EP3212987A1 (en) Tank for containing under pressure fluids and method for obtaining the same
US5746344A (en) Tank connector construction
JP2003139296A (en) Fiber reinforced pressure vessel and manufacturing method therefor
CN103561886A (en) Bushing device, water conduction mechanism, and production method therefor
US20040113310A1 (en) Printing cylinder manufacture
US5431764A (en) Method of fabricating a tank and method of fabricating a tank connector therefor
US20240044456A1 (en) High-pressure cylinder with core in plastic material and surface covering in composite material and related method of production
JP3770270B2 (en) Heat roller and heat roller manufacturing method
JPH0431779B2 (en)
US5568687A (en) Method of fabricating a tank and method of fabricating a tank connector therefor
US3716906A (en) Method of making food containers
US6054679A (en) Deposition method of product molded with thermoplastic resin, and a depositing electrode to be used for this deposition method
JP7215712B2 (en) Manufacturing method of tank with manhole and manhole body
WO2005084912A1 (en) Method of producing a boiler comprising a perforated reinforcing by rotational moulding
JPH069855B2 (en) Method for producing corrosion resistant aerosol container

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

17P Request for examination filed

Effective date: 20020324

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: RO PAYMENT 20020701;SI PAYMENT 20020701

17Q First examination report despatched

Effective date: 20030818

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20050127