DE640636C - Process for protecting pipelines for gases, liquids, etc. Like. Against external influences - Google Patents

Description

The invention relates to a method for protecting pipelines for gases, vapors, liquids and cables against external influences.

It is known to prevent corrosion by pipelines. Apply a permanently plastic permanent, non-hardening and non-embrittling mass © of the bandage according to the patent 482 374 protect. If you have such protected pipes for sealing to the outside with the well-known tar-soaked jute bandages or other protective outer covers surrounds, so · occurs after some time when moving of the pipes in the ground an embrittlement of this outermost protective cover, and it get through the resulting hairline cracks or the like. Moisture and other damaging Agents to the plastic protective mass, making the tissue of the bandage unfavorable can be influenced.

It has now been found that these disadvantages can be avoided by if you get between the outermost protective cover and the plastic anti-corrosion compound an intermediate layer is included, which binds the outer jacket to the plastic layer.

Tests have shown that the

Switching on such intermediate layers an absolute protection of the metal pipe to be secured it is brought about, because 'the intermediate layer closes the plastic layer, even if cracks appear in the top layer, from the. damaging agents.

In the event of a shock, fall or other stress on the pipe protected in this way In the worst case, there is only partial flaking of the brittle outer jacket, which The intermediate layer remains, so that never the less mechanically resistant lowest plastic layer comes to lie on the outside unprotected.

The formation of the intermediate or transition layer can be, for example, as follows be brought about.

On the pipe to be protected, which is covered with a plastic mass or bandage according to the patent 482 374 is provided, you bring a hard protective coat, preferably made of asphalt, Bitumen, etc. The design and composition of this tough protective jacket one chooses with regard to the composition · of the plastic protective layer so · that this is the inner surface of the outer layer of asphalt, bitumen or the like to a limited extent dissolves or dissolves that the transition layer arises.

With this in mind, come for the outside Covering to be considered: not too brittle petroleum bitumina and asphalt with a melting point of 65-4-100 ° with or without Addition of rubbers or fabrics.

When such an outermost protective layer is applied in sufficient thickness, the loosen the bitumen contained in the plastic masses forming the desired Interlayer sufficiently without

a solution that goes too far (dissolution of the outermost bitumen layer or the like) occurs.

Example of a composition of the plastic layer when using an outer jacket made of not too brittle bitumen with a melting point of 90 to 115 °: 55 parts of mineral fat with a dropping point of 54 °, 5 parts of montan wax, 3 to 5 parts of magnesium silicate (TaI-kum), 5 parts of asbestos powder, which are stirred together well at a temperature of 60 to 70 ° and, if necessary, are also applied in a copious layer on both sides of fabric strips or the like.

The accompanying drawing shows a schematic cross-section of a detail a pipe wall, which in the context of the invention by. Applying various Layers is protected.

ao ι is the inner metal jacket of the pipe, 2 is the plastic mass layer; 3 is the intermediate or transition layer, 4 is the outer, hard protective sheath.

The invention can of course also be used for containers and other objects such protection is required.

Claims (2)

Patent claims: . i. Procedure for protecting pipe ■■■ ·· ;. lines for gases, vapors, liquids ,. ' ■■; '■■ and cables against external influences, thereby characterized in that the metal pipeline (1) made in a known manner against corrosion by applying a permanently plastic material or Schurtzbinde (2), z. B. according to patent 482 374 is provided with an outer jacket (4), which is preferably made of high-melting bitumen materials, asphalt o. The like. Is provided, with the interposition of a layer (3), which the Outer jacket (4) binds to the plastic layer (2). 2. A method for producing a protection for pipelines according to claim i, characterized in that the outermost layer is a high-melting bitumen or asphalt with a melting point of 65 to over 100 ° is used, so < that the intermediate layer through the components contained in the plastic mass (Mineral fat) itself is released on the outer layer. 1 sheet of drawings