CROSS REFERENCE TO RELATED APPLICATIONS
This patent application is a divisional of U.S. patent application Ser. No. 12/680,895, filed Jul. 6, 2010, (now allowed) which claims priority to National Stage of International Application No. PCT/EP2008/060795 filed Aug. 18, 2008, the full disclosures of which are incorporated herein by reference in their entirety.
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OF THE INVENTION
The invention relates to a coating process for the coating of an interior of a pipework system, as well as to a sub-distributor and a working equipment for the treatment of a pipework system in accordance with the preamble of the independent claim of the respective category.
Such processes are used for drying oxidizing or otherwise corroding water pipes in buildings, for derusting them by means of sand blasting, and for coating them subsequently with an epoxy resin coating or with an other plastic layer.
Mostly, water pipes of a building are subdivided in several pipelines. A typical example is a pipeline in a plumbing unit in an apartment or in a house. Water pipes for cold water constitute a first pipeline leading to a water-closet, a bathtub, a washbasin, and a shower. Water pipes for hot water leading to a washbasin, a bathtub, and a shower constitute a second pipeline. The water pipe for hot water is supplied by a hot water boiler. The pipes establishing the pipelines for hot water can corrode and rust, too. Further pipelines in houses and apartments are in the kitchen and in the laundry, are constituted by pipeline systems for heating installations and so on.
Nowadays, the most common application of known working processes is the coating of cold water pipes and pipelines in buildings. Regarding buildings, a frequently given coating problem is that no building plans for the sanitary pipeline system are available. And if such building plans are available, the pipes are very often installed different from that shown in the building plans. Regarding the coating processes known so far, this can have the consequence that some pipe sections are not coated. Later on, this problem will be highlighted with the help of FIG. 3 and FIG. 4. Regarding known processes, the still fluid coating material is blown into each connecting pipe, for example into the pipes for the toilet, the washbasin, and the bathtub at the same time. Thereby, an amount of coating material is blown into each connecting pipe which amount was determined from the length and the diameter of the pipes given in the building planes.
In case that the effective length of pipes is identical to the length determined from the building planes, it can be assumed that the coating is perfect. But it happens that the pipes used have an inner diameter which is completely or partly greater than assumed so that the calculated amount of coating material is not sufficient and a greater amount of coating material would be necessary for a perfect coating.
Also the contrary happens in practice, namely the amount of epoxy resin was calculated to much because the pipes are completely or partly thinner than assumed, or the length of the pipes is actually shorter than assumed, leading to that too much coating material is blown into a particular pipe section so that the inner surface of the pipe is coated too thick, or in an extreme example the pipe is clogged by the coating material.
Regarding the existing processes, there is no possibility to determine whether the pipeline is perfectly coated by the coating material, or whether the thickness of the coating has the preset reference value, respectively.
But also the preparation processes known from the state of the art which must be carried out beforehand the actual coating process have disadvantages not being eliminated until now.
Regarding this, the pipework system must be completely dewatered and dried in a first step. With regard to the known processes, after having drained the water being in the pipes at the lowest point, hot air is simply blown into the pipework system at one or more access points for a given period of time. Very often, in particular if the pipework system comprises a lot of bendings, the water is not completely drained since the water is retained in the bendings of the pipework system and, thus, is not blown out.
Strongly related problems are present at the following sand blasting of the pipework system. Regarding this, in particular the bendings are often only insufficiently cleaned by the sand blasting process or critical locations are reached not at all. In addition, the known processes have to work with high blasting pressures, in particular to get the problems at bendings under control, which, in case of thin or already strongly worn-out pipes, leads very often to the situation that the pipes are positively shot-through at the bendings by the sand blasting process, in turn leading to that the masonry in which the pipes are installed must be broken open, and the old pipes must be replaced by new ones, what actually should be avoided by the coating process.
Problems similar to the afore described in connection with the draining of the pipework system also consequently arise when dedusting the pipework system which must be done after the sand blasting process and before coating.
It is thus an object of the invention to suggest an improved coating process which renders possible to ensure in a controllable manner that all parts of the pipework system to be coated are coated having a preset thickness.
It is furthermore an object of the invention to provide an equipment with which the working process as well as the coating process can be carried out in a reliable, cost-effective, and simple way, preferably in a completely automated manner.
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OF THE INVENTION
The subject matters of the invention which satisfy these objects are characterized by the features of the independent claim of the respective category.
The respective depend claims relate to particularly advantageous embodiments of the invention.
Even if the invention is primary related to a coating process for the coating of an interior of a pipework system, in the framework of the present application a working process shall be described, too, which can be combined with the coating process in accordance with the invention in a particularly advantageous manner and which in particular can be carried out with the sub distributor according to the invention being also to be described thereinafter as well as with the working equipment including the sub distributor.
Hence, for reasons of clearness, at first a working process for the treatment of an interior of a pipework system shall be described, which pipework system includes a part-system between a first connection and a second connection, wherein the working process includes the following working steps: Providing a first working fluid being under an over-pressure with respect to an ambient pressure. Providing a second working fluid being under a low-pressure with respect to the ambient pressure. Thereby, the part-system is pressurized between the first connection and the second connection with the first working fluid provided under the over-pressure and the second working fluid provided under the low-pressure at the same time in such a way, that a fluid-flow of the first working fluid provided under the over-pressure is established through the part-system between the first connection of the part-system and the second connection of the part-system in a direction to the second working fluid provided under the low-pressure. Preferably, in at least one working step the direction of the fluid-flow through the part-system between the first connection and the second connection is reversed at least once.
Thus, it is essential for the new preferred working process that in at least one working step the direction of the fluid-flow through the part-system between the first connection and the second connection is reversed at least once. Because of that, on the one hand a reliable draining, drying, and dedusting of the pipework system to be renovated is possible for the first time, since in particular the residua in the bendings can be reliably removed. In addition, in particular the blasting process is much more gentle since it is blasted in both direction so that it can be worked with a smaller blasting pressure compared to the state of the art, and, nevertheless, the bendings of the pipework system are reliably cleaned.
The pipework system is in particular a networked pipework system including at least two networked sub-systems, preferably being networked by means of a networking-pipe, in particular by an uptake pipe or by a down pipe and the networked sub-systems preferably including at least one part-system, wherein the sub-systems includes at least one second part-system being connected to a first part-system.
In practice, the pipework system often includes a plurality of sub-systems, being preferably established in a plurality of floors of a building. Preferably, for each sub-system a main-distributor is provided which main-distributor provides the first working fluid and/or the second working fluid to the attached sub-system, and wherein the main-distributor is in particular a staircase-air-distributor.
Thereby, a sub-distributor is provided within each sub-system, with the sub-distributor making the first working fluid and/or the second working fluid available to the part-system of the sub-system, wherein the sub-distributor is in particular an air-distributor for a plumbing unit and/or wherein the sub-distributor is preferably designed in such a way that the first working fluid or the second working fluid can be made alternatively and switchably available to an outlet of the sub-distributor, wherein the first working fluid and/or the second working fluid is made available to the sub-distributor preferably via the main-distributor.
In practice, the first working fluid being provided under the over-pressure is provided by a compressor, in special cases in which a compressor cannot be used, it is provided by a over-pressure reservoir and/or the second working fluid being provided under the low-pressure is provided by a vacuum machine or by a low pressure reservoir.
Even if in practice due to cost requirements the first working fluid and the second working fluid is simply air, it is also possible to use a gas, for example oxygen or nitrogen, or an inert gas such as for example a noble gas or an organic gas, for example in order to dissolve organic residues within the pipework system.
Preferably, an air control station is provided for adjusting and/or regulating the over-pressure and/or a water separator and/or a cyclone filter for separating a fluid is provided, in particular for separating water, an oil, an epoxy resin and/or for separating particles, in particular abrasive particles, especially sand and/or for separating an other environment-friendly or not environment-friendly material.
In principle, the pipework system to be renovated can be any pipework, for example, but not only, a pipework system of a building, in particular a cold water pipework system, a hot water pipework system, a circulation pipework system, a pipework system for a heating installation, in particular a floor heating installation, a gas pipework system, a wastewater pipework system, a water pipework system for a roof, a pipework system for a swimming-pool, a pipework system for pressurized air, a pipework system for distributing oil, and/or the pipework system is a pipework system for an industrial facility, in particular a pipework system for wastewater, gas, oil, petroleum, crude oil, diesel oil, gasoline, chemical products, or for other industrial gases, industrial fluids or industrial solids, and/or wherein the pipework system is a public pipework system for pipelining one of the aforementioned fluids, other fluids, or solids.
For operating the new advantageous working process in an efficient manner, the entire pipework system is networked at least with all main-distributors and/or with all sub-distributors and/or with all air control stations and/or with all water separators and/or with all cyclone filters before starting the working process.
The working process can be operated in a particularly efficient way by providing an electronic data processing installation and by designing at least some of the main-distributors and/or of the sub-distributors and/or of the air control stations and/or of the water separators and/or of the cyclone filters in such a way that the working process can be at least partly carried out automatically and/or program-controlled.
Regarding a special embodiment, the new working process is a preparation process for draining and/or the desiccation of the pipework system, which preparation process includes the following steps: providing a first preparation fluid, in particular air, which first preparation fluid is under the preparation over-pressure with respect to the ambient pressure. Providing a second preparation fluid, in particular air, which second preparation fluid is under the preparation low-pressure with respect to the ambient pressure. Thereby, in a first preparation step the part-system is pressurized at the same time via the first connection with the first preparation fluid provided under the preparation over-pressure and via the second connection with the second preparation fluid provided under the preparation low-pressure in such a way that a fluid-flow of the first preparation fluid is established through the part-system between the first connection of the part-system and the second connection of the part-system in a direction from the first connection to the second connection in such a way, that the part-system is pre-emptied from a procedural matter, in particular from water. In a second preparation step the part-system is pressurized at the same time via the first connection with the second preparation fluid provided under the preparation low-pressure and via the second connection with the first preparation fluid provided under the preparation over-pressure in such a way that the direction of the fluid-flow through the part-system between the first connection and the second connection is reversed so that the part-system is post-emptied from a residual remain of the procedural matter.
When performing in the first part-system the first preparation step and the second preparation step, preferably at least one connection of the second part-system is disconnected from the first preparation fluid and from the second preparation fluid.
After the first part-system, the second part-system is in practice often at first pre-emptied and subsequent to that post-emptied.
For blowing out the part-system after the pre-emptying and the post-emptying of the part-system, all connections of all part-systems of the sub-system are advantageously pressurized for a preset blowing-out period by the first preparation fluid being provided under the over-pressure.
Very often, at least two coupled subsystems are present being coupled to each other by a networking-pipe and the networking-pipe and the sub-systems, being successively pre-emptied and post-emptied, are subsequently pressurized and blown out by the preparation fluid for the preset blowing-out period.