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Nov 22, 2004 With injection from inside, and depending on the process and media utilised, all the aims of the injection processes mentioned in Abschnitt 5.2.2 can be achieved in man-accessible as well as in non-man-accessible regions. Injection from inside offers the following advantages over that from outside:
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(Image: Schematic depiction of the Posatryn process) The Posatryn process is based on the Penetryn process (Patent No. 3,168,908/3,168,909) and was developed in the USA in the year 1960 and has been used in the Federal Republic of Germany since 1975 [NASSCO85a] [Rhode66] [Schop81]. In the region of the respective point of damage a packer is positioned under supervision using a TV camera and this makes the injection possible (Bild 5.2.2.4.1.1.1.1). |
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The Posatryn process is meant mainly for sealing pipe joints and lateral cracks, as well as locally limited leaks in pipes with a circular cross section in all materials usually used in the sewage sector in the nominal size range of DN 150 to DN 4500 with the exception of masonry sewers. Corresponding packers are also available for ovoid cross sections 200/350. Other cross sectional forms require special equipment. The preferred regions of application … |
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The preparations include the cleaning of the respective section of the sewer and the removal of any existing flow obstacles that can hinder the pulling of the packer through the section of the sewer to be repaired. When using a packer with a centrally arranged throughflow, the volume flow of the sewer can be maintained by up to 50 % of its capacity as long as it does not cause a back up. |
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The individual working steps of the Posatryn process are shown in the video. The apparatus required - sewer TV camera and packers (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) (Bild 5.2.2.4.1.1.1.4) - are introduced into the section of the sewer through the manhole and pulled to the point of damage and positioned there by a winch by remote control. The packer |
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(Image: Schematic depiction of the equipment for the Posatryn process with reference to [Lenah72] [Image: S&P GmbH]) Two persons are required for carrying out the Posatryn process in the non-man-accessible region and 3 persons in the accessible region. The whole installation (Bild 5.2.2.4.1.1.1.5) is installed on a truck and consists basically of the compressed air and injection equipment, the sewer TV equipment as well as the associated measuring, … |
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The Posatryn process offers the following advantages:
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Nov 22, 2004 |
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Nov 22, 2004
For this process, which is similar in principle to the Posatryn process, a new packer has been developed [FI-IBAK]. It consists of a hollow aluminium cylinder over which is pulled a one-piece, highly elastic and wear-resistant sleeve with two integrated inflatable chambers (Bild 5.2.2.4.1.1.2). By means … |
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Feb 16, 2011
The Telegrout system was developed in the USA by the Haliburton Company [Claph65]. This system utilises a 3-part packer (Bild 5.2.2.4.1.1.3) that can be used in three variants in the nominal size range of 150 mm to 700 mm.
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Nov 22, 2004 As representatives for this process group, the Posatryn (Abschnitt 5.2.2.4.1.1.1), Seal-i-Tryn (Abschnitt 5.2.2.4.1.1.2) and the Telegrout systems (Abschnitt 5.2.2.4.1.1.3) will be dealt with in more detail in the following. |
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Feb 16, 2011 (Image: Cherne process - 3-Chamber packer [FI-Schei]) The Cherne process developed in the USA in 1972 (US Patent 3,894,131) utilises a special packer with three inflatable packer sleeves or chambers (Bild 5.2.2.4.1.2.1) [Mimms83] [Sulli77]. The method of operation is shown in Bild 5.2.2.4.1.2.1, Bild 5.2.2.4.1.2.1, Bild 5.2.2.4.1.2.1 and Bild 5.2.2.4.1.2.1. The supply to the packer is achieved by a 5-part hose for:
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Nov 22, 2004 The packer system for the injection and the working steps of the MUSA process correspond to those of the Cherne process. In addition, a test chamber is added at the front in order to prove the required socket leaktightness and a rotating high pressure cleaning for flushing of contaminants in the gap of the pipe joint as a preparatory measure (Bild 5.2.2.4.1.2.2) (Bild 5.2.2.4.1.2.2) (Bild 5.2.2.4.1.2.2) [FI-maagh].
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Nov 22, 2004 The basic difference from the sealing processes based on acrylic resin mentioned above is in the more difficult handling of the polyurethane, which has the higher adhesive strength and greater strength in the end condition. This requires special packers with packer sleeves that have a greater ability to separate from the hardened polyurethane resin and that expel the injection medium completely out of the injection chamber. Representatives of this … |
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Nov 22, 2004 (Image: Sealing a pipe joint with the AMK or the RIM process with reference to [FI-AMK] [Image: S&P GmbH]) A representative of this is Amkrete Resin Injection Process, well know since its development in 1983 in England under the original "AMK" designation [FI-AMK] [NN86f]. It is used for sealing and/or fixing of leaks, longitudinal and lateral cracks, pipe breaks and cavities in the embedment in sewers DN 100 to DN 500 and materials of concrete, vitrified … |
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Nov 22, 2004 Rehabilitation and Maintenance of Drains and Sewers Injection from Inside with Non-Man-Accessible Cross Sections In the injection of pipe joints, also called socket injection, there are mostly used injection media based on acrylate resin, polyurethane and epoxy resin (Abschnitt 5.2.2.1). These media require different packer systems and mixing techniques for the respective components used. Generally a difference can be made between:
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Nov 22, 2004 Rehabilitation and Maintenance of Drains and Sewers Injection from Inside with Non-Man-Accessible Cross Sections (Image: Long packer of the Posatryn process [WRC90]) The object of injection into the pipe shaft or the section of the sewer region is the renewal of the leaktightness and the static bearing strength of damaged pipes or sectors of the section of the sewer also including the embedment. Long packers (Bild 5.2.2.4.2) with an injection medium based on acrylic resin are used for sealing injection. For restoring the leaktightness and the static bearing strength, … |
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Feb 16, 2011 Long packers with two inflatable packer sleeves connected together with a flexible intermediate piece are used for injection in the region of laterals (Bild 5.2.2.4.3.1) (Bild 5.2.2.4.3.1). The introduction of the packers can take place with winches or with the use of a pneumatically driven, self-advancing pulling installation [Steke84] attached to the point of the packer. The removal of the long packer can present difficulties with large annular spaces … |
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Feb 16, 2011 The simplest method for also sealing the connection of the lateral in one working pass is with the use of normal or long packers in the sewer immediately in the region of the connection together with a blocking balloon in the lateral. With this process, the injection medium is pressed into the whole of the blocked region and thus reaches into the leak and also into the soil. After the completion of the injection work, the gelled injection medium … |
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Nov 22, 2004 Injection processes based on polyurethane [FI-Janße] or cement as a binder [FI-Strobb] are used especially in the rehabilitation of nozzles or the connection regions of main sewer/private property connections. Special packers are used in both cases (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) (Bild 5.2.2.4.3.3) and these are positioned in the … |
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Nov 22, 2004 Rehabilitation and Maintenance of Drains and Sewers Injection from Inside with Non-Man-Accessible Cross Sections The further development of TV cameras to those with very small dimensions (Abschnitt 4.3.2.1) makes it possible today to position packers in laterals of DN 100 to DN 150. As regards the packers used, it depends on the locality of the application:
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Feb 16, 2011 These processes, according to the information of the manufacturers, are applicable for sealing leaking and/or cracked sewers or pipe joints, laterals and manholes and also part pipe breaks, whereby in this case the stability must still be ensured. In the regions of the leaks and depending on the ability of the injection medium to penetrate, the embedment is also sealed and fixed. The processes can all be used with the materials usual in the sewage … |
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Feb 16, 2011 After taking the section of the sewer to be worked on as well as its associated laterals out of operation and arranging the required by-pass flow, flushing with high pressure flushing apparatus is carried out as dirt can influence the chemical reaction of the two components under certain circumstances. |
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Feb 16, 2011 Sealing is carried out in two working steps. In the first, the affected section of the sewer is filled with the solvent A from the manhole and, depending on the local conditions, a pressure of 0.1 - 0.4 bar is applied (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2) (Bild 5.2.2.4.4.2.2). In this way, the solvent forces its way into the leaks or, through … |
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Feb 16, 2011 The tailings of the solvent B left in the section of the sewer are neutralised with a diluted solution A. This work is, of necessity, coupled with a leaktightness test in order to prove the success of the injection. The closed-off section of the sewer can then be immediately put into operation again. In the Sanipor process, the sewer is cleaned with water and the tailings of the gel are removed. This is possible as the gel only reaches its final hardness … |
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