Originally developed for refineries since 1979, ONIS solutions equipped all units involved in hydrocarbon units and utilities (steam, gas, nitrogen,...). From upstream to downstream, ONIS Line blinds are used as battery limits in order to isolate safely and quickly a unit of a petrochemical complex but as quick and safe positive isolation when required by process or maintenance safety procedures. Thus, ONIS solutions are used to isolate pumps, filters, exchangers, pressure relief valves, rupture discs, flame arresters in varied units as offshore platforms, FPSO, refineries, hydrocracker, delayed coker, FCC, catalytic reformers, LPG, asphalt production, …