By Edited by Moo-Hyun Kim
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Extra info for SPAR Platforms: Technology and Analysis Methods
Sample text
Environment directionality and platform orientation; 3. fendering and supply boat mooring arrangement needs; 4. direction(s) of design extreme environment affecting mooring system load-sharing or hull VIV suppression considerations; 5. catenary risers and subsea flowline/pipeline layout requirements; 6. wellbay pattern at the seabed level; 7. pullover direction of the spar for post-installation drilling as well as the MOPDU mooring footprint requirements (if relevant); 8. feasible options for different mooring system configurations; and 9.
75 in. for the Holstein truss spar (a similar size chain is also being considered for the BP Atlantis semisubmersible platform). Bridon has a maximum transport load of 110 tonnes per spool, which corresponds to a segment length of about 3100 ft. for a 6-in. jacketed spiral strand wire rope. For reference, the maximum lengths for other sizes are shown in Table 2-2. Table 2-2. 6 Absolute Max. 3 Maximum specified length metres feet 2105 1985 1888 1778 1689 1584 1500 1426 1368 1298 1245 1167 1107 1065 1025 985 941 904 870 6907 6513 6193 5835 5541 5198 4921 4679 4487 4259 4085 3830 3631 3493 3364 3233 3087 2965 2853 System Installation Key constraints include the maximum line weight and anchor weight/size the installation vessel can handle during installation.
Existing spar platform installations have been designed for a field operating life of 20 years or longer, and their mooring systems have been designed to be in operation for the duration of the field design life without replacement due to strength, fatigue, corrosion, and abrasion. Accordingly, jacketed spiral strand wire rope has been used to ensure adequate design service life. The design service life also affects the corrosion and abrasion allowance, which in turn directly affects the mooring line size.