| Open-cut method |
Pipes are laid down on the bottom of the trench cut by excavator. Major benefit of this method is that pipeline is always visible during work; there is enough space for repair and preventive measures. This method has place during building of the oil and gas pipelines of big diameters.
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| Trenchless method |
Trenchless method has wide range of application for water, gas, sewage pipelines construction. There are many different methods of trenchless pipe installation: horizontal drilling, pinhole, sanitation are the most common.
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| HDD |
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| Pipe sanitation |
During this method special device brings sand-cement or polymer mortar on the inside walls of the pipe, for blocking water infiltration in the damaged place. Those types of cover avoid big growth of organic and are resistant to corrosion. Service life of the pipes increases up to 50 years.
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Pipe relining
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During this method PE pipe is pulled into the existing pipe with some reducing of the existing pipe diameter. This process can be proceeded with or without bursting of the old pipe. Bursting is necessary when bigger diameter is needed. As in the case with HDD method, pipe relining requires high skilled specialists and site personnel. Relining without bursting the old pipe takes place, when some reducing the inside diameter of the existing pipe is possible. Better discharge capacity of the new pipe will compensate this reducing.
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Pipe renovation
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Pipe renovation – it is trenchless pipeline rehabilitation with collapsing the old pipe when simultaneously is pulling in the new pipe with bigger, less or the same diameter. There are two methods of pipe renovation – first one, means replacement of the existing pipeline from one manhole to another using threaded pieces (connected right in the manhole) of the PE pipe (about 1 meter piece length). The second method means bursting of the existing pipe. During bursting the new pipe is pulling in through one of the two pits by powerful hydraulic bursting machine which is located in the other pit. It is possible to pass through 150 meters pipeline section for one passage.
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| Pipe cleaning |
Pipe cleaning is much called for today. Pipes are every where and they become dirty, very dirty through years. Pipe cleaning can return pipeline from bad working or not working to good working condition. Pipe cleaning prevents developing of organic or non organic debris and deposits inside of the pipe, which can cause serious failures in pipeline operation.
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| Video diagnostic of the utilities |
Modern technologies which were not so popular, recently, are more and more often take place in the solution of everyday problems. Tele inspection video diagnostic of the pipes – is striking example of this fact. More and more often ask for video diagnostic owners of living houses and private flats as well as municipal and industrial organizations.
Main purpose of video diagnostic is to assist in pipe rehabilitation. There are several main tasks which are solved by that system, they are: determining of wall stand joint condition, cracks, knots, clogs and other defects location. It is used for commissioning the pipeline, rehabilitation or cleaning the pipeline, during detection of unauthorized jointing, searching lost manholes.
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| Siting |
Siting it is the process of detecting street gathering main on plan. Main task of the siting is self flowing deflecting of water through the pipelines. Siting of the pipe network depends of many factors. They are: a) relief for reducing depth of the pipe laying and reflecting sewage water by its self flowing b) positioning of the sewage purification facilities c) outlined place of waste water releasing into basin d) accepted sewage system e) character of block building f) sequence of building.
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