Evaluation of the Safe and Failure Zones of Mooring and Riser Systems in a CALM Oil Terminal

Abstract The mooring and riser system is the most critical part of an offshore oil terminal. Traditionally, these two parts are designed separately without considering nonlinear interaction between them. Thus, present paper aims to develop integrated design process for systems with a lazy-S configuration in catenary anchor leg (CALM) One important criteria considered this offset diagram safe operation zone (SAFOP) related riser, respectively. These diagrams obtained by different analyses; therefore, codes or standards available components. In methodology, both risers lines incorporated into single spiral, thus identifying failure zones This, turn, leads substantial benefits terms overall response, cost reduction, safety To implement process, three lengths at sea depths terminal installation site. For each condition, executed according derived procedure. Then, coupled dynamic models, wherein buoys hoses included, developed using OrcaFlex. Results show that relevant regulations not satisfied reducing length relative size. Further, as water depth increases, type shows good performance while interacting system. cross mode, maximum margin created SAFOP diagram, response tanker occurs near far modes. Therefore, method, best position direction 90° case.