As is the case with any type of infrastructure, sewers require regular maintenance. But the often narrow pipes below the ground are difficult to access. Instead of unearthing them at great expense, users of trenchless renovation procedures use specialized robots that carry out the work in the interior of the pipelines. Pipetronics is a market and technology leader when it comes to the development and manufacture of sewer robotics. 


I had studied precision engineering—called mechatronics today—and in 1990 I interned for a semester at D.T.I., an engineering office for special machinery construction. At the time, the company was developing a machine that was capable of milling off projecting parts of residential connection lines in pipes with a diameter of 6 to 12 inches. This cleared the path for an inspection camera. I was tasked with testing and improving the prototype.

While the customer approved the aforementioned prototype, the device was difficult to work with. As part of my degree thesis, I had the idea for a milling robot. This product was further developed at D.T.I and the first robots for sewer repairs were born. In 2000, I and the sales manager acquired the sewer robotics division from D.T.I. for the company we owned back then.


Those initial customers were mainly from Germany, France, and Switzerland. Trenchless sewer renovation was already popular in these countries early on. At the time, we only had one competitor from Switzerland. As the industry was relatively small, we quickly made a name for ourselves worldwide and soon began exporting to Asia and the United States. The notion of working in the sewer without having to dig up the road is an irrefusable sales pitch. It saves time and money and traffic is not interrupted.

The length of the German sewage network is about 375,000 miles. According to our estimates, about 18 percent of this requires short-term renovation or replacement. I assume that it is about the same or worse in other countries.


The machines and devices that work in the sewer require sturdy and durable technology on the smallest possible footprint. Standard solutions are rarely feasible, which is why we develop most of the components ourselves. In terms of operation, we are expecting an increasing shortage of expert personnel. The idea is to replace humans with intelligent technology that can be operated without specialized training. The trend leans towards automatic traveling to the damaged location and automatic repair.


If you need a lot of power in a small package, you need corresponding motors. Faulhaber’s product range includes motors that meet all of our requirements, such as for the robot’s drive, which has to pull a very heavy cable, or for the miniature wiper of a small camera.


Hydraulic drives are very solid, but their efficiency is limited for our scope of applications. Add to that the noise pollution and exhaust from the generator and the hydraulic unit. This should be avoided particularly when working in inner cities and residential areas. Electric drives and batteries allow us to operate the robot systems emission-free and almost noiseless.

Thus far, we have predominantly used brushed drives because suitable control options for brushless drives in our machines were not available in the past. The controller must be right on the motor, because it cannot be controlled over a 500-foot-long supply line. Our newest technology works with CAN-Bus, which also enables the controlling of brushless motors. The trend is moving towards bus technology and brushless drives. Brushless motors are subject to less wear, and they can be controlled and programmed.

Our top priorities are a small installation space and high-power density both for the motor and the electronics. And of course combined with robustness and durability.


Our core expertise lies in the development and manufacture of robotic systems. Our know-how is based upon decades of experience. That also extends to the vehicle equipment and generator design. We are also offering other innovative products on the market and to the users, such as pinpoint repairs with synthetic resin, for example. And we are continuously investing large amounts into further developments.

Our technology gives us a lot of flexibility, which enables us to easily integrate special designs into standard products on request. Sewer repair is clearly our core business. But in principle, the technology can also be used for the trenchless renovation of potable water pipes. It can conceivably be used in other pipeline systems, such as in the chemical industry, to inspect gas lines, tank systems, or pressure tanks.

People ask, do you think it’s possible for humanoid robots to one day open manhole covers and descend down into the sewer? Anything is possible in principle. But such a technology would be highly complex and expensive. There are simpler solutions that are more expedient in every which way.  


Pipetronics offers innovative solutions for trenchless sewer renovation. This includes a wide range of electric and hydraulic robots. The high degree of consulting and servicing expertise is supported by the company’s five service locations, which also repair the devices. The company also offers individual equipment options for the vehicles and attachments including accessories and a wide range of consumables for sewer repairs. The product range also includes the internal pipe sealing systems RedEx®, Pipe-Seal-Fix, Pipe-Seal-Flex, and Pipe-Seal-End as well as the appropriate equipment. For more information, visit

Did you enjoy this article?
Subscribe to the FREE Digital Edition of Modern Pumping Today Magazine!