With the advancements in process technologies there has been an ever increasing need to look into superior performance materials to meet the expectations of longevity of process equipments and structures in corrosive applications such as storage tanks pipes scrubbers and number of others. A usual trend in the corrosion industry is to utilize high cost metal alloys or use various coating technologies to extend the design service life of the metallic structure in the corrosive environment. Fiber reinforced polymer (FRP) composite materials serve as an alternative to these expensive alloys in highly corrosive environment to provide light-weight improved corrosion performance and flexibility of producing large scale structures. In this paper analytical corrosion modeling was performed using the state-of the art stress-rupture data produced by Owens Corning to quantify the superior performance of E-CR Glass based FRP composites in terms of weight savings and extended service life. This paper will quantify and contrast the corrosion performance of 316 and 304 grade Stainless Steel and FRP composites in 5% NaCl 3.65% HCl corrosive environments.