Delavar A, Mirza Ebrahim Tehrani M, Alizadeh SS. Layers of protection analysis to achieve safety integrity level (SIL), Case study: Hydrogen unit of refinery. Sci. J. Pure Appl. Sci. [Internet]. 2016Nov.10 [cited 2024Apr.20];5(11):515-23. Available from: http://www.sjournals.com/index.php/sjpas/article/view/168