Blog New demonstration system from I.S.T. Molchtechnik Article New demonstration system from I.S.T. Molchtechnik By Horst-Dieter Kludas on 08.01.2024 Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Share on Telegram Share via Email Share link Check icon Close When planning pigging systems, it is important to select the best options from a wide range of different fittings and distributors. I.S.T. has designed a new demonstration system to not only show these options in theory, but also to demonstrate their practical functionality. A single-pig and a twin-pig system are integrated, which can be controlled separately or together. Control is via a Siemens S7, communication with the sensors and actuators is via two different bus systems, which were chosen to illustrate the possibilities. An Ethernet system from IFM and a Profinet system from Turck were installed here. Two T-fittings, T40, were used in the single-pig system, one of which has a pig changeover function. In this system, the medium is first pumped through the pipeline. Once pumping is complete, the pig empties the pipe from the sending station to the receiving station. The pig is then returned to the sending station, where it is ready for the next pigging process. For the two-pig system, a T-piece was used as the sending station and a T-ring valve with receiving station. The first pig is moved out of the sending station with the medium, so there is one pig in the sending station and one in the receiving station during pumping. After pumping, the line contents can be moved into the T-outlet of the T-ring valve or back into the sending station, into the T-piece. Both pigging systems can be connected to each other at a pipe junction. A piggable distributor node of type T56 was used for this purpose. When the distributor node is opened, the lines are connected to each other. At the same time, the open, internal gate valve performs a pig trap function. This allows the medium to be pigged up to and from the distributor node in order to achieve complete emptying of the line. This distributor node can be connected to form a matrix arrangement and thus be used for complex, piggable distributions. Further details in the product catalog under T56. The demonstration system can be viewed by appointment at I.S.T.'s headquarters in Hamburg.