Protecting the Interior Surface of Sewage Pipelines

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  • By Abram Teplitskiy, Igor Endovtsev and Igor Shpachenko

    Sewage is mostly transported by gravity from the customers to waste water treatment plants – through concrete pipes. Because of gravity, the upper part of sewage pipelines remains empty, which leaves an area of concentrated bacteria. The bacteria germinate due to the content of the transporting substances. As a result of this bacterial activity, the strength of pipelines' concrete weakens and leads to the destruction of pipes.

    One of the effective ways to protect this arching (vaulting) part of pipelines is to spray the pipeline interiors with protective solutions. To do this, the authors developed a mechanical device using the TRIZ principle of self-service. This device allows for jet-spraying of a protection solution by spiral trajectory as shown in Figure 1.

     Figure 1: Rotating Jet-sprayer Inside
     Concrete Pipeline

    Figure 2 shows a small cart, which is driven along the bottom of a pipe. (Inside the pipe is a truss that connects to an exterior motor.) The authors used the self-service principle to create a spiral trajectory without using an additional source of energy. After analyzing all available sources of energy, there was an energy resource already at hand – the rotation of the wheel moving the jet-sprayer.

     Figure 2: Jet-Sprayer Car

    1 – Sprayer; 2 – Sprayer's ball-bearing; 3 – Carrier; 4 – Disk;
    5 – Disk's ball-bearing; 6 – Flexible rubber hoses

    As previously stated, the energy source for moving this device is located outside the pipe and connects to the cart by a truss. Rollers center and stabilize the moving curt and can be adjusted inside the pipe's internal surface. Due to this capturing of the cart's own energy, the adjustable sprayer moves smoothly inside the pipe. Pressure-spraying material is supplied by separate hose, moving inside the pipe along with cart. Synchronization of the mechanical system is supplied from the elasticity of rubber hose, also developed using the self-serving principle. (See Figure 3.)

     Figure 3: Self-Service Principle for
     Rotating the Jet-sprayer

    1 – Jet-sprayer; 2 – Carrier; 3 – Disk; 4 – Axle; 5 – Cart

    The jet-sprayer (1, Figure 3) strengthens carrier (2, Figure 3) with a ball-bearing (5, Figure 2) that is able to rotate relative to its longitude axle. The flexible hoses (6, Figure 2) are connected to the jet-sprayer (1, Figure 3) and to sockets in the axle, which strengthens the hold to the cart. Carrier (3, Figure 2) strengthens disk (4, Figure 2) by never allowing it the opportunity to intersect with the flexible hoses (6, Figure 2).

     Figure 4: General Look of a Device
     for Spraying the Interior Surfaces
    of Pipelines

    Figure 4 shows a working prototype of the jet-spraying device. It was built, but never entered the worldwide marketplace due to the destruction of the construction industry in the Ukraine.

    About the Authors:

    Abram Teplitskiy, Ph.D., is a consultant for inventing, applied physics and civil engineering. Contact Abram Teplitskiy at tepl (at)

    Igor Endovtsev is an electrical engineer from the Ukraine who worked with Abram Teplitskiy's scientific and inventing team for many years. Contact Igor Endovtsev at tepl (at)

    Igor Shpachenko is a dual mechanical and electrical engineer from the Ukraine. Shpachenko is part of Abram Teplitskiy's Inventive and Scientific team and has participated in the creation of more than ten inventions. Contact Igor Shpachenko at tepl (at)

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