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These official CCS Guidelines were developed and released by China Classification Society. They shall apply to the welded steel offshore structures, such as mobile units, jacket units, FSO, FPSO etc. In case the offshore structure is of some special or novel structural type, special consideration is to be given to the fatigue strength assessment. Here is the list of the topics that have been covered in this publication - Genera (including definitions and some info on the S-N curve approach and fracture mechanics method)l; Fatigue analysis based on S-N curves. Stress concentration factors have been covered together with the hot spot stress calculation; Safety factor of fatigue was explained; Various methods of fatigue analysis, such as simplified FAM, method based on fracture mechanics and spectral-based fatigue analysis method; Improvement methods of fatigue life; Extended fatigue life; Structural detail classification corresponding to S-N curve fatigue assessment; Parametric formulae for calculation of the stress concentration factors of tubular joints; Stress concentration factors for penetrations with reinforcements. We hereby advise the designers and analysts of the offshore structures of the fact that in some cases technical criteria by a cognizant regulatory authorities may significantly differ from what is contained in these Guidelines...