doi:10.3850/978-981-08-9247-0_rp055-icsas11

ABSTRACT

Steel jacket platforms are the major type of platforms used for offshore Malaysia for water depth from 45 to 80 meters. Worldwide platforms are designed API (LRFD & WSD). The parameters in these codes for Gulf of Mexico (GOM) and North Sea are much higher due to severity of weather. Since this is not true for Malaysia, these parameters need to be evaluated. This work examines what changes can be made in this regard for future design in this country. The jacket platforms in Malaysia are being designed as per API WSD. The weather conditions in Malaysia are different compared to GOM. The load factor used for environmental load by API and ISO code for extreme event is 1.35. Data for this region needs to be analyzed so that proper reliability based load factors can be developed for this region. For this, the environmental parameters for extreme conditions (100 year) and normal conditions (1-5 year) are considered. Offshore fields in Malaysia are spread over three regions. Wind is measured at 10 m elevation and standard time interval is 1h. To collect data for waves, the stable sea state is taken as 3hour time period. For the design of offshore jacket platforms, global forces from wind are not as important as those which are caused by waves and currents. The ISO recommends the use of 10 minute average mean wind for overall structural analysis and 3 second gust wind speed for design of individual component. The significant wave parameters for single, periodic design wave are height, crest elevation above MSL, period and direction.

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