Hamid Anbarestani - MSc, Department of Marine industry, Science and research branch, Islamic Azad University; Tehran, Iran
Naser Shabakhty - Assistant professor, School of Civil Engineering, Iran University of Science and Technology

The life of the offshore platform under fatigue damage is estimated using the time history of thestructural stress [1]. This research was conducted on the basis of the API code for one of the platforms installed in the South Pars region. The result shows, fatigue damage is an important failure mode for riser and it may effect on the lifetime of riser.