6American Petroleum Institute. API RP 2A-WSD-2004, Rec- ommended practice for planning, designing and constructing fixed offshore platforms-working stress design [ S ]. Washing- ton DC: American Petroleum Institute, 2004.
7Det Norske Veritas. DNV-OSS-102, rules for classification of floating production, storage and loading units [ S ]. Det Norske Veritas, 2012.