In this essay we will study the using of OPC standard in adapting and removing the incompatibility between different components and devices in the control system . The OPC works as a third party that connect between devices (data sources) and programs that require this data , in case those programs may can't connect directly with that devices as a result of incompatibility between them. This incompatibility happens because these devices and programs are from different vendors or because the devices are very old and can't connect with newer programs. OPC will be a suitable solution for communications problems between the devices and programs in the control system, the OPC will connect to each of them and transfer data as good as if the connection between them is direct without any third party. The importance of this suggested technique will be shown practically in this essay through the implementation of it in solving one of the pumping control system problems in the Syrian Company for Oil Transport (SCOT). the suggestion was to use a OPC Server program (Kepware OPC Server) and a SCADA program ( WinCC flexible) instead of the old SCADA program and keep the old PLC devices , in this way we can get rid of the problems that appear in the old SCADA program and therefore we can ensure that the system will work as wanted with no problem. That will bring benefits to the company and results to high reliability in the work.