Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
  • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
  • B08B9/027—Cleaning the internal surfaces; Removal of blockages
  • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
  • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
  • B08B9/0323—Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
  • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
  • B08B9/027—Cleaning the internal surfaces; Removal of blockages
  • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
  • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
  • B08B9/0326—Using pulsations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B2209/00—Details of machines or methods for cleaning hollow articles
  • B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
  • B08B2209/022—Details of apparatuses or methods for cleaning pipes or tubes making use of the reversal flow of the cleaning liquid

Definitions

• the invention relates to a method for cleaning and coating pipelines or piping systems, in particular intended for water routing, the pipeline or the pipeline system being cleaned with acid and coated with plastic ⁇ tet and where liquid plastic is poured into the pipeline or into the pipeline system for coating and is discharged from the pipeline or from the pipeline system after coating.
• a method of the type in question is already known from EP 0 326 867 B1.
• a combined pipe cleaning and coating method is disclosed, with first a rough cleaning using water and compressed air, then a fine cleaning using acid, then a drying process and finally a coating using plastic. Fine cleaning is achieved by filling the pipeline with acid and keeping it there for a defined period of time. After the acid has been drained off and a drying step, plastic is poured into the pipeline, which also remains there for some time, after which the excess plastic is finally discharged from the pipeline.
• the known method is disadvantageous in terms of the time required. Among the four essential process steps - coarse cleaning, fine cleaning, drying, coating - the coarse cleaning based on a mechanical effect and the specific exposure time required in the Pipeline acidic fine cleaning requires a lot of time and thus lengthens the process.
• the known method from which the present invention is based, is used primarily for the renovation of drinking water pipes in residential buildings.
• Metallic, in particular galvanized, pipes and corresponding connecting pieces are used as drinking water pipes.
• the problem with the known remediation process is that after the acid treatment, acid builds up in the capillary area of the inner pipe surface. This can lead to later signs of corrosion below the plastic slide.
• galvanized pipes or pipe connectors are particularly badly attacked by acid. Acid attacks the metal and dissolves it, forming metal salts and hydrogen. The chemical reactions below the coating in turn have a negative influence on the quality of the plastic layer. Furthermore, the hydrogen ions released can diffuse through the coating and reduce the pH of drinking water.
• the invention is therefore based on the object of improving a method for cleaning and coating pipelines or piping systems of the type in question, in particular in such a way that on the one hand the time required to carry out the method is reduced and on the other hand a damaging influence of the acid is effective is avoided.
• the method according to the invention achieves the above object by means of the features of patent claim 1.
• the method in question for cleaning and coating pipelines or piping systems, in particular for water supply is designed and developed in such a way that the pipeline or the piping system from the acid is flowed through that the acid is replaced by a neutralizing agent after the cleaning process and that the neutralizing agent is discharged from the pipeline or from the pipeline system after the neutralization and before the coating.
• the use of a neutralizing agent ensures that acid residues which have settled in capillaries and / or cavities in the inner wall of the pipe cannot undergo any chemical reaction with the pipeline or the coating or the medium flowing through the pipe after the rehabilitation.
• the neutralizing agent also has the great advantage that it is basically a primer for the subsequent application. Layering is provided, which allows particularly good wetting of the inner tube wall with the plastic or adhesion of the coating to the inner tube wall.
• the acid circulates through the pipeline in various directions of flow.
• the direction of the force acting on the coverings can be changed with regard to the mechanical effect. For example, such an attack can occur on topping forms with undercuts or those with directed scale formation.
• the acid is passed pulsating through the pipeline or through the pipeline system. Due to the pulsation of the acid, a higher flow velocity occurs in the vicinity of the raw inner wall. On the one hand, this results in an even more intensive exchange of used and fresh acid in the covering area and, on the other hand, the mechanical flow on the covering to be removed is improved due to the increased flow rate, which advantageously means the total residence time of the acid in the pipeline or the pipeline system can be shortened.
• the circulation and / or the pulsation of the acid expediently takes place under the action of compressed air.
• a compressed air-operated pump could be used for indirect action, which at the same time promotes pulsation.
• a direct action of compressed air is conceivable.
• supply and return lines are provided.
• a hose system can be used that is introduced into the building through building openings.
• the supply and return lines are connected on the one hand to the connection points for sanitary fittings of a residential building and on the other hand to a flushing device.
• 10% mineral acids have proven to be particularly effective cleaning acids. It is particularly advantageous to have the acid circulate through the piping system in the heated state, in particular at a temperature of about 60 ° C. The increase in temperature also increases the rate of the chemical reaction, which in turn has a positive effect on reducing the time required.
• the neutralizing agent is introduced into the pipeline system as a passivating agent.
• the passivating agent is basic and preferably has a pH of 10. In this way, the aggressive effect of the hydrogen ions of the acid residues remaining in the pipeline or in the pipeline system is made harmless.
• the passivation agent effectively forms a surface protection for the inner surface of the pipeline or the pipeline system, so that corrosion, for example in the form of Pitting below the future plastic coating is effectively avoided.
• the passivating agent not only protects the inner tube wall from corrosion, but also serves to condition the inner tube wall for the coating by reducing the surface tension of the inner tube wall and the plastic, so that there is good wetting and a closed formation of the plastic layer.
• the passivating agent - like the acid - is preferably circulated.
• the supply and return lines installed for acid circulation can be used.
• the circulation of the passivating agent in the circuit is also preferred from the point of minimizing the time required for the method.
• filling with plastic from the lowest point of the pipeline or the pipeline system has been recognized as particularly advantageous.
• the gases, which are anyway lighter and contained in the house pipeline, are better displaced in this way and the pipe system is actually completely filled.
• Filling with plastic is based on the principle of "communicating tubes".
• the pipeline could now be filled in a particularly simple manner under the action of compressed air.
• a compressed air supply line is led to a container filled with plastic and the plastic is conveyed upwards by the action of the compressed air via a riser.
• open sanitary connections serve as Air outlet points. This ensures that side strands are also completely filled with plastic in accordance with the ventilation.
• the filling of the pipeline system could advantageously be carried out in such a way that already filled side strands of the pipeline are sealed off after filling in order to avoid undesired leakage of the plastic.
• a two-component plastic based on epoxy resin has proven to be particularly effective with regard to the plastic coating. This selection is supported by the good properties of epoxy resins, namely good adhesiveness, toughness, resistance to acids and alkalis.
• FIG. 1 shows a schematic diagram of a schematic diagram of a residential building, the pipe system of which is subjected to the cleaning step of the method according to the invention
• FIG. 2 shows a schematic diagram of a basic sketch of the house from FIG. 1, the pipeline system of which is subjected to the neutralization step of the method according to the invention
• 3 shows a schematic diagram of the principle of the residential building from FIG. 1, the pipe system of which is subjected to the coating step of the method according to the invention
• FIG. 4 shows a schematic diagram of a schematic diagram of the residential building from FIG. 1, the pipe system of which is subjected to the drying step of the method according to the invention.
• Figures 1 to 4 show in a schematic diagram a multi-storey house with a piping system 1. Figures 1 to 4 illustrate the essential process steps of the inventive method.
• FIG. 1 shows the cleaning step, which comprises flowing an acid through the piping system 1.
• FIG. 2 illustrates the neutralization process, with a passivating agent circulating in the pipeline system 1.
• FIG. 3 shows the filling of the pipeline system 1 with plastic.
• the coating process is followed by the drying process illustrated in FIG. 4.
• the pipe system 1 comprises a cold water pipe system 2 and a warm water pipe system 3.
• a feed line 4 and a return line 5 are assigned to the pipeline system 1, as can be seen from FIGS. 1 and 2.
• the flow line 4 and the return line 5 are on the one hand at connection points 6 of the sanitary fittings 7 and on the other a flushing device 8 connected.
• the rinsing device 8 is a rinsing car with a control device 9.
• the acid With the help of the control device 9, the acid is brought into circulation according to FIG. 1 and the passivating agent according to FIG. 2, via the control device 9 the direction of flow and the flow rate of the liquids and especially the pulsation of the acid can be controlled.
• the acid is subjected to a pulsation.
• the acid reaches the pipeline system 1 via the flow line 4, which is guided through window openings of the house, and then reaches the return line 5.
• the rinsing device 8 is equipped with filters, not shown here, so that the acid enriched with residue from the deposits can be cleaned and returned to the flow.
• the neutralization step of the method according to the invention also takes place according to FIG. 2 according to the circulation principle.
• the supply and return lines 4 and 5 installed for the cleaning step are used for flushing the piping system 1, which is present here as a drinking water line system. Both the acid and the neutralization liquid are circulated under the influence of compressed air.
• the coating step of the method according to the invention is shown in FIG. 3.
• plastic is first filled into the risers 11, 12 and further into the side strands 13, 14 from the low point 10 of the pipeline system 1.
• the filling takes place by means of compressed air, for the generation of which a compressor 15 is available.
• the compressed air generated by the compressor 15 is supplied via the compressed air line 16 led to the pressure vessel 17 in which the plastic is contained.
• the side strands 13, 14 are filled with plastic according to the principle of the communicating tubes, the air in the piping system escaping through the open ends 6 of the sanitary fittings 7.
• the plastic which otherwise hardens after 12 hours, remains in the pipeline system 1 for some time and is discharged from the pipeline system 1 after setting a specific layer thickness.
• the coating in this exemplary embodiment in addition to properties of a smooth, homogeneous surface, freedom from cracks, temperature resistance and abrasion resistance, also has a material quality which corresponds to the requirements of the drinking water regulations.
• a drying step is connected in this exemplary embodiment of the method according to the invention.
• air is sucked out of the pipeline system 1, specifically by means of an air suction device 18, also from the low point 10 of the pipeline system 1.
• an air suction device 18 also from the low point 10 of the pipeline system 1.
• teaching according to the invention is not restricted to the exemplary embodiment discussed above. Rather, the teaching according to the invention can also be implemented in pipelines or pipeline sections which are not integrated in residential buildings.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cleaning In General (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7759108

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (7)

• 1995
  • 1995-04-07 DE DE19513150A patent/DE19513150C1/de not_active Expired - Fee Related
  • 1995-06-07 CZ CZ951488A patent/CZ283550B6/cs not_active IP Right Cessation
• 1996
  • 1996-03-20 WO PCT/EP1996/001189 patent/WO1996031298A1/de not_active Application Discontinuation
  • 1996-03-20 EP EP96909999A patent/EP0764062A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events