Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/56—Three layers or more
  • B05D7/57—Three layers or more the last layer being a clear coat
  • B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
  • B05D7/227—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of containers, cans or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D90/00—Component parts, details or accessories for large containers
  • B65D90/02—Wall construction
  • B65D90/022—Laminated structures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2504/00—Epoxy polymers

Definitions

• the present invention relates to restoration or repair of underground metal tanks or reservoirs which were damaged by corrosion, and more particularly, but not exclusively, of tanks for combustible oils.
• the protective coating according to the present invention is applied inside metal tanks undergoing the corrosive action of internal and/or external agents.
• the protective coating for underground tanks according to the present invention does not show the above mentioned drawbacks and it is advantageously used also for drinking water reservoirs, compartments of tankers for crude oil or water transportation (and ballast in the empty no-load trip) and the like.
• the protective coating for underground tanks consists of a plurality of layers of two materials only, and more particularly, but not exclusively, of an epoxy paint and a fiberglass fabric.
• the so obtained coating consisting of said combination of epoxy products and fiberglass fabric and having a thickness of 1500 - 4000 microns, has a very high mechanical strength and cannot be attacked by acids and stray currents.
• the coating consisting of such a combination warrants a good tank tightness even in presence of severe external corrosion.
• the coating according to the present invention may also be formed by a greater number of layers of fiberglass cloth and epoxy resin, in case the conditions of the tank sheet plates require so.
• protective coatings of greater thickness may be not suitable from both the technical and economical paint of view.
• a coating consisting of four layers, namely two layers of epoxy paint, one of fiberglass cloth and a final vitrifying overlay coat.
• the epoxy paint used in the protective coating according to the present invention may be any one of the known paints of this kind, i.e. having a high adhesive power in respect of both the metal and the fiberglass fabric used, a high resistance to the attack of chemicals to the found in the field of use, an expansion compatible with that of metal and it must be miscible with suitable hardeners, whose properties are to be dictated by the field and product of use. It could also be possible to use polymeric fabrics having a high elasticity modulus.
• the coatings according to the present invention consisting of four or more layers, were applied on sheet plate samples and subjected to tests of resistance to stray currents, to aggressive chemicals and of mechanical strength at room temperature.
• the internal coating for underground tanks according to the present invention is prepared in situ and therefore has a simple and quick application, so as to form by itself an alternative structure to the tank.
• the components i.e. paints and fiberglass cloths
• the components may be prepared when required and their preparation requires only common and direct operations.
• Other materials could be considered as components by a man skilled in the art but they would be equivalent as to properties and processing operations, so that their use falls in the scope of the present invention.
• the internal coating for underground is mainly characterized by the combination of two materials such as epoxy resins and fiberglass cloth, to be applied in situ as layers with simple known, methods of the relevant technique.
• Another valuable characteristic of the application in situ of the coating of the present invention is its reliability as to lack of toxicity and development of explosive gases.
• a further valuable characteristic of the application in situ of the coating of the present invention for restoring old underground tanks is the formation of an inner shell having autonomous chemical and mechanical features in respect of those of the tank, and therefore of a structure which is not influenced by the tank conditions.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=11163562

Family Applications (1)

Country Status (2)

Cited By (4)

Family Cites Families (2)

• 1983
  • 1983-03-15 IT IT20070/83A patent/IT1161916B/it active
  • 1983-12-21 EP EP83201830A patent/EP0122980A3/fr not_active Withdrawn

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