With the help of the electronic control system built in the preinsulated pipe system it is easy to check the status of the insulating layer constantly. The fact that the insulating layer is soaked and the exact place of the leak can be determined exactly, either it is a result of the damaged outer coating or the result of the back of proper sealing on the inner pipe.
When the insulating layer is soaked the thermal characteristics of the material change together with it's insulating resistance. The control system detects the change in the insulating material's electric insulating resistance at the place of the leak. With the help of this resistance change detector it is possible to determine not only the mere fact of the leak but even the exact place of it. The electric control system can both be installed for continuous and temporary operation. Considering the length of a pipeline, it is advisory to set up controlling loops of a few hundred meters that are independent of each other there is an electric resistance at each binding of the pipeline, at both ends of the pipes. These resistances highly influence the length of the loops, because the number of resistances within a loop cannot exceed 100.
In this case both ends of the control loop end in plugs which are positioned in a shaft or some other suitable place for storage. The control process is carried out with a portable control device, which shows the exact place of the error.
The control loops are connected to built-in measuring devices, so it is possible to maintain a control method that is based on continuous monitoring. This has got more advantages with widespread and more complicated pipe systems. In this case the signal of a leak goes to a center. The exact place of the leak is determined with a portable device.
These electronic control systems can be built into ISOIJ~R- compatible preinsulated pipe systems. Besides that they might also be used to control some other types of pipelines.