DD284616A5 - METHOD AND DEVICE FOR THERMAL PIPE CLEANING - Google Patents

Abstract

The invention relates to a method and a device for the internal cleaning of gas pipelines as a pre-treatment for subsequent Innenabdichtverfahren for Muffenspalte or Innenauskleidungsverfahren. Its object is to eliminate oelige and tar-containing contaminants in the pipe by conversion into mechanically and environmentally friendly removable components and thus to create the conditions for subsequent inner sealing process or -auskleidungsverfahren. According to the invention, the object is achieved in that the oily and tarry soil layers are subjected to a short-term heating and cracking process by means of a heat source arranged on a trolley, for example a ring burner. By gas jets and subsequent known mechanical cleaning process, the incrustations are removed and discharged. FIG {cleaning; Pipeline; Gas network renovation; Dirt layer, tarry; Dirt layer, oelig; Heat; cracking; brittle; Gas jet; blowing; Trolley; Waermequelle; Ring burner; Inner lining}

Description

Launch pit transported where they are filtered and discharged after filtering to the outside. In the following operations

the remaining brittle dirt layer is cut off in a known manner by mechanical means and discharged from the tube. After fine cleaning with brushes then a prepared for gluing or inner lining clean inside pipe surface is present.

The method has the advantage, through targeted use of the heat source, that the incrustations are at the site of their attachment

be converted into loose components and thus environmental pollution caused by large amounts of accumulating gases and

Vapors that arise during simple burn-out can be avoided. The arrangement and the compactness of the device allows the standard, operationally progressive use

on construction sites of energy companies and industry in the cycle to clean and refurbish larger

Pipe sections. embodiment

The detailed explanation of the invention is based on an embodiment according to the drawing, which represents eii.en burner carriage in the pipe.

Starting from the starting pit 1, a rope-drawn torch trolley 2 with ring burner 3 travels through the pipe 4 in the direction of the target pit 5, the directed flame briefly heating the surface of the pipe for a short time. The oil and tar-containing dirt layer cracks on the pipe surface to a solid, brittle crust, which tears up shell-shaped and is lifted by the 45 ° directed high-pressure jet. Contrary to the direction of travel of the burner trolley 2, the resulting flue gases and solid components are blown by the mounted in the target pit 5 blower in the direction of the starting pit and filtered out by a filter 7. The deep-seated plastic sealants located in the socket gap area soften, and the socket gap undergoes a Nachdichtwirkung. Since experience has shown that the dirt layer increasingly settles in the lower third of the burner is designed so that larger nozzles come into effect in the lower region, so as to cause the cracking evenly and completely in all areas, without the pipe wall is excessively heated , It is important to pay attention to a short-term, strong warming.

Subsequently, the cleaning of remaining solid components in a known manner with mechanical devices, such as striking tools and brushes, wherein the more firmly adhering tar and oil components chipped and removed as dust or splinters from the pipe.

The remediation of the thus cleaned surfaces can then be done safely and permanently using known methods using multi-component adhesives or by Innenauskleidungsverfahren.

Claims (3)

1. A process for the internal thermal cleaning of gas pipelines of tarry and oily incrustations, characterized in that the tarry and oily incrustations are briefly strongly heated and cracked by a movably disposed in the tube directed heat source, thereby embrittle, shell-shaped tear and the kinetic energy of a high pressure Gas jet are applied and blown away. 2. Apparatus for thermal internal pipe cleaning, characterized in that on an inner tube adapted to the carriage (2) an annular heat source (3) is arranged, which is directed at an acute angle to the pipe wall (4) and against the direction of travel nozzle for a high-pressure hot gas having. 3. Apparatus according to claim 2, characterized in that a gas-operated annular burner with acute-angled directed towards the pipe wall flames is used as the heat source. For this 1 page drawings Field of application of the invention The invention relates to a method and a device for the internal cleaning of gas pipelines as a pretreatment for subsequent inner sealing methods for sleeve gaps or inner lining methods. Characteristic of the known state of the art The known technique for internal pipe cleaning provides mechanically working devices with brushes or striking tools, as well as the also mechanically acting pig principle, in which a pig corresponding to the pipe caliber is pulled several times through the pipe. With this method, dirt crusts can be removed that contain no oily or tarry components. Oily or tarry soils are evenly distributed by purely mechanical methods but can not be removed. The use of chemical methods to remove such layers is eliminated because of the environmental hazard, as leakage occurs in any case, a seepage of the rinse liquid into the ground. In addition, the disposal of large quantities of solvent is an unsolved problem. The simple burning out of hollow bodies, in which the incrustation is ignited and driven by the supply of atmospheric oxygen, the burn-out, is known, but has the disadvantage of high environmental pollution by large amounts of released gases and vapors. So far, there is no effective method for internal pipe cleaning with fat or tar-containing contamination available. The result is that the subsequent sealing process can be performed only greatly reduced quality, since the adhering to the pipe wall greasy contamination prevents effective bonding between the pipe wall and adhesive sleeve of the liner. Object of the invention The invention has the development of an economically favorable method to the target, which causes an effective cleaning and zero fatigue of the pipe inner wall and thus allows an economically favorable and permanently acting Innenabdichtverfahren for fat and tar crust pipes. Explanation of the essence of the invention The invention has for its object to eliminate oily and tar-containing contaminants in the pipe by converting the physical and chemical properties of the incrustations in mechanically easy and environmentally friendly removable components.
According to the invention the problem is solved as follows: The tarry and oily dirt layers are subjected to a heating and cracking process by means of a movably arranged, directed heat source in the tube and become embrittled. The so embrittled layers tear by internal stress on the tube inner surface shell-shaped and are acted upon by the kinetic energy of a directed at an acute angle of optimally 45 ° to the pipe inner surface high-pressure gas jet and thereby blown away in the direction of the filter. The beam direction is variable in the range of 45 ± 15 °. On a trolley, which is adapted to the pipe inside diameter, a heat source, for. B. a burner system mounted, which with a directional flame, the pipe inner wall briefly, but heated at high temperature so that the fat and Teerbo components of the dirt layer cracks and subsequently present as a solid, brittle layer. The energy supply is metered so that experience shows that in the lower third located higher Ablagerunge.ι reinforced. The trolley is pulled on a steel cable from the start to the target pit over a fixed rehabilitation distance (about 90 to 100m). Attached to the rope is the hose or the cable for the power supply. An energy source can be accommodated on the trolley. Contrary to the direction of movement of the trolley, ie in the area of the target pit, the blower is installed, which produces the gases, vapors and volatile solid constituents which form during combustion in the direction