Fitness For Service And Remaining Life Assessment Pada Tangki T-900

Abstract

Storage tanks play an important role in the oil and gas industry by providing a safe container
for crude oil and refined products during the operational period. However, aging tanks often
experience structural deviations due to operational pressure and environmental factors. This study
focuses on assessing the remaining life of a crude oil storage tank located in Balikpapan, which is
planned to be repurposed for gasoline storage. Initial inspection revealed critical issues, including
roundness, plumbness deviation, and foundation settlement, which can significantly affect the tank’s
structural stability and long-term reliability. A Fitness for Service (FFS) evaluation, based on API 579-
1/ASME FFS-1 guidelines, was carried out to determine whether the tank remains safe for continued
operation. Calculations were conducted using statistical methods for corrosion rate and remaining life,
this calculation combined with ASTM G16-13 and ISO 14802. The result of remaining life for
plumbness is 60 years, settlement is 200 years, while roundness has exceeded its service life by 6
months.