Modelling of operation process (OP) influence on safety of a critical infrastructure (CI) is presented. Particular model of safety of this CI impacted by its inside subsystems and assets dependences and by its external threats occurring in its environment of operation is created. CI safety and resilience indicators are defined and their determination procedures are proposed. Next, this model is adopted to the system composed of pipes that are used for oil transportation and which are influenced by OP. Both safety as well as resilience analysis is performed.