Oil and Gas (O\&G) industry is risky and the financial, environmental or human loss could be verv high. Distillation towers (DTs) are sensitive svstems and have key For the purpose of analysis, the distillation tower represented here is divided to three subsystems as; (1) Distillation column and its pressure relief system (2) Reflux system and overhead outlet (3) Column base and reboiler Part I: Complete the fault tree analysis shown above. Part II: Calculate the probability of production loss from the fault tree completed in part