One of the main problems of industrial processes is security. A Safety Instrumented System (SIS) allows the control and security of an industrial process to be carried out automatically. This work presents a compilation of norms and standards related to industrial safety. This information was used to design the safety instrumented system. With the objective of knowing the process, a mathematical modeling was carried out, which contributed in knowing more the most important process variables and also in recognizing some process variables that were not taken into account so far. This was also very helpful when automating the system since control logic and philosophies were based on the process variables studied so far. The Safety Instrumented System was developed based on the general requirements obtained from the standards previously studied. These requirements were induced to the process of pumping water between reservoirs giving rise to that the integral levels of safety SIL were determined. Next, the control system and the security system were integrated into the DCS Siemens PCS 7 module, which allowed to concentrate all the process data of the process on a historical server. Finally, the safety functions implemented were validated through theoretical checks based on SIL verifications and experimental tests that allowed us to know the robustness of the system implemented when facing hazards