В качестве объекта исследования выбран опорный блок морской стационарной платформы. <...> PROBLEMS OF RESULT COMPARISON OF EXPERIMENTAL FATIGUE TESTS WITH ACTUAL STRUCTURAL ELEMENTS OF OFFSHORE FIXED PLATFORM JACKETS Task scaling of results obtained during laboratory sample testing to actual structural elements (SE) of jackets (J) of offshore fixed platforms (OFP) is important from a practical standpoint. <...> Recent researches propose different estimation theories of scaling factor impact depending on surface roughness of an actual structural element of an OFP and a weld joint as compared to a smooth sample (roughness within 0.16-0.32um), actual geometrical dimensions of a SE and weld joints of a jacket of an offshore fixed platform as compared to laboratory samples, stress concentration due to a weld joint type and possible defects, residual stresses in a weld and a heat affected zone depending on stress ratio, possible availability of metal zones with different mechanical properties, parameters of cross-sections etc. <...> The purpose of this paragraph is scaling of fatigue endurance obtained as the result of experimental investigations to actual structural elements and weld joints of the OFP jacket. <...> It should be noted that while procedures of different factor interaction have been developed and obtained practical confirmation for consideration of main factors affecting the scaling of experimental results of metal samples of structural elements of the OFP then such procedures have not been developed sufficiently for weld joints. <...> Let’s consider the procedure of mutual interaction consideration of the main operating and process factors affecting the fatigue endurance value change and change of other parameters of the S-N curve for main structural elements of the offshore fixed platform jacket. <...> In many authors' opinion the ration of dimensions of a laboratory sample and elements of structural elements of the OFP jacket, asymmetry of stress cycles, surface roughness and impact of surface hardening procedures should be considered as such parameters. <...> The net effect of these parameters on fatigue endurance is considered by introduction of the coefficient of impact according to the following formula: , (1) 281 Актуальные проблемы современной науки, № 3, 2015 Where, 1КЭ МСП strength of a laboratory material sample; К КЭ МСП К – fatigue strength of a structural element <...>