Determining likelihood of corrosion under insulation (CUI) for pressure vessel in separation system at the offshore platform

In this era, oil and gas mining activities were at the bottom of sea. Therefore, offshore platforms are needed to support activities. The platform consists several systems. One systems that have most critical function is separation system. system has important equipment (test separator (V-1010) production (V-1020)). So, level risk from test (V-1020) becomes consideration ensure process can run well safely. problems increase corrosion under insulation (CUI). On surface given which using for personnel protection energy conservation. Thus, CUI occurs on between insulation. This research, methodology in API RP 581 determine likelihood (V-1020). From value 0,255178494 failure/year, 0,255151772 failure/year.