CS215547B1 - Reinforced plastics tanks and pipes - Google Patents

Abstract

Tanks and pipes made of reinforced plastics for wide use due to their strength and chemical resistance are provided with a metal lining or an intermediate layer made of cathodically deposited metal.

Description

The invention relates to a tank and piping of reinforced plastics intended for the widest use in terms of strength and chemical resistance, which is manifested in their construction, incl. production technology.

At present, tanks and pipelines are made of a chemically resistant liner liner and a carrier layer. The lining comprises either a gelcoat layer or other reinforced layers of the same binder used in the carrier layer. According to other construction systems, the same binder used in the support layer is used or is formed by internal self-supporting linings of thermoplastic material or metal. The backing layers are usually made by hand or machine lamination from glass, carbon, metal and other reinforcement, for example from strands, mats and fabrics, impregnated with a suitable plastic, for example unsaturated polyester, epoxy and the like resin.

The disadvantages of these constructions are the low strength properties of the gelcoate liner, the poor applicability of low and elevated temperatures for thermoplastic liners and the high weight of the metal liner liners. If gelcoat layers or thermoplastic linings are used, the different elongation of these materials causes problems depending on the temperature, unreliable connection between the flange and the flange. by screwing and bearing layer and inner layer or lining. Another disadvantage in this case is the impossibility of conducting a static charge from the inner surface of the lining without affecting the properties of the wall. The high elasticity of the thermoplastic inner self-supporting linings has an adverse effect on safety in the case of destruction of the vessel or pipe due to internal overpressure.

These drawbacks overcome the reinforced plastic tank or pipe designs of the present invention. The essence of the invention is that the tanks or pipes are provided with a metal lining or intermediate layer made of cathodically deposited metal.

The tanks or pipes according to the invention make it possible to reduce the thickness of the bearing walls and thus substantially reduce their weight. Within the operating temperature range, their wall has no thermal dependence of the ductility. The lining is, due to the cathodic metal deposition inside the vessel, perfectly connected to the flange or fitting to which it continuously flows. In order to make the tank or pipe itself, it is necessary to produce a removable or soluble cavity model, on which the actual product is then made. The corrosion resistance is dependent solely on the corrosion resistance of the cathodically deposited metal used and is quite high here, e.g., nickel, iron, nickel, copper and the like.

The tanks or pipes can be used preferably for compressed gases, eg compressed oxygen, ammonia and the like or even solvents such as gasoline, benzene, diesel and the like. The electrical conductivity for dissipating static charges is perfect in all cases. The low thickness of the lining is sufficient for the tightness of the product, which increases the safety of its handling.

Example 1

The precision winding technology made from a combined glass and carbon epoxy laminate with a wall thickness of 2 mm isotensoid tank with a volume of 5 liters. The laminate itself is porous and cannot be used for pressure tanks. In order to use this application for vehicle air braking systems, it is provided with an internal galvanic layer of nickel.

This layer is applied to a thermally cured tank with laminated metal flanges on the silver-coated inner surface. The tank is immersed in a galvanic bath and a platinum electrode is inserted through the pole hole of the tank. At a current of 40 A for 7 hours, a 0.3 mm thick nickel coating is formed which is sufficient to prevent the ingress of the medium. Another advantage is that the coating joins homogeneously with the flange. The tank produced in this way can withstand internal overpressure up to 35 MPa.

Example 2

Precision winding technology made of polyester fiberglass made of 30 l cylindrical tank and wall thickness

2.4 mm. At present, for safety reasons, the use of plastic tanks for storing flammable substances is not permitted due to the possibility of electrostatic charges. In order to be usable as a reservoir for storing flammable liquid, the above tank is coated with a conductive lacquer containing silver and, after drying, the platinum electrodes are attached and immersed in a galvanic solution. At a current of 60 A for 16 hours, a 0.2 mm thick iron-nickel layer is applied, the electrode position being guided so that a sufficiently thick layer is applied at the pole opening to make the flange or screw connection. The electrostatic charge is also drawn in this section.

Example 3

With the precision winding technology, a pressure pipe of Js 50 was produced to transport aggressive media as follows.

By hand, a fiberglass chemically resistant liner was produced on which a silver layer was deposited and a 25 A nickel-plated nickel layer was applied to this preform by a galvanic current of 25 A and 12 hours per 1 m length. This layer allows perfect sealing of the laminate, so that when this tube is wrapped by the over-winding method of polyester glass laminate - 3 layers of 2.4 mm thick,

Claims (1)

Reinforced plastic tanks and pipes, characterized in that they are provided with a metallic failure of the pipe at an internal pressure of 65 MPa. invented by a lining or intermediate layer made of: cathodically deposited metal.