... Abstract The objective of this paper is to present the new Offset-Pontoon Semi-submersible (OPS) for use as a drilling and production platform. The new semi-submersible features pontoons that are offset to the outside of the columns which lends the vessel a low heave response and enables...

..., stability, and airgap. he shape of the lower hull was optimized for the required natural heave period and minimum heave response. A study was r than 21s, as can be seen in etry of the appendages at the Figure 3 Heave RAO of JBF Arctic compared with other designs Deckbox top diam D Lower hull outer diameter...

...") Of particular note is the heave response. The low heave response allows the use of top-tensioned risers and dry trees by use of constant tensioners. Figure 3 below shows the RAOs of the heave response of the Titan hull with all designed risers attached. Figure 3 - Heave RAOs The design of the TTRs were...

... riser designer natural period upstream oil & gas displacement geometry computation arrangement model test cancellation period offshore technology conference motion response platform subsea system frequency optimization heave response construction otc 19112 non linear...

... of a DDF with 56 000 Mt displacement and up to 30 rigid risers. The DDF has been analyzed at 1400 m water depth both in a West Africa and a Gulf of Mexico natural environment. By investigating the effect of including keel plates at large depths below the SWL, the heave response of the DDF can...

... heave. To account for hull viscous drag on the heave response, 8% of critical damping has been added for the resonant heave period, based on experience from model basin tests for deep draft floaters. A model was assume closed with no internal moon pool, i.e., the water inside the moon pool moves...

..., and risers. Results of the coupled analysis reveal that mooring line dynamics and riser friction have significant effect on the Spar heave response. In this paper, comparison of coupled analysis results to Neptune Spar motions during Hurricane Georges will be presented. As a result of reduction in heave...

.... As a result, second order difference frequency excitation can be an important contributor to the total heave response. However, ordinary deep draft spar platforms have low damping and relatively low natural period. A combination of these two characteristics and swell may lead to linearly excited heave...

... pontoon operation dumbbell semisubmersible drilling unit drilling unit buoy subsea system heave response upstream oil & gas water depth wave period construction riser requirement drilling equipment deep water reliability mooring system otc 6272 configuration thruster...

... and stability requirements for floating production systems. Analytical predictions of heave response are compared to model test results. The "Ocean El Dorado" floating production system will be a purpose built, catenary moored semi-submersible vessel capable of simultaneous drilling and production in water...

... and heave, respectively. It is seen that the agreement between the RAO from a band limited white noise test and the RAO from single wave frequencies is generally valid for the moderate to small waves but shows some deviation for larger waves. The heave response In the frequency band corresponding to 17...

... subsea system zane barnes stability center caisson mooring system variable load design water depth otc 5625 stability analysis heave response trendsetter class semisubmersible criteria requirement upstream oil & gas heave displacement aTC 5625 Integrated Motion, Stability...

... procedure threshold drilling operation upstream oil & gas vessel heave heave time history artificial intelligence probability heave response drilling equipment riser disconnection weather significant heave downtime persistence graph persistence petrel vessel operability...

... This paper describes how two model basins, testing the same semisubmersible design, produced different motion response results. Subsequent t?sting revealed the phenomena that the heave response of the modeTis extremely sensitive to small changes in wave period. Calculations show that over- simplification...

... frequency platform upstream oil & gas regular wave shallow draft irregular sea cross-section engineer subsea system configuration wave force wave-excited force addedmass resonance heave response north sea vertical motion OFFSHORE TECHNOLOGY CONFERENCE 6200 North Central Expressway...