Loads on Tie-Down Systems for Floating Drilling Rigs during Hurricane Conditions

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Title: Loads on Tie-Down Systems for Floating Drilling Rigs during Hurricane Conditions
Author: Bae, Yoon Hyeok
Abstract: Tie -down systems are used to fasten drilling rigs to the deck of offshore structures during harsh environmental conditions such as hurricanes . During Hurricane Ivan (2004 ) and Katrina (2005 ) , a number of offshore structures were moved and several tie -down systems were damaged . In the present study , the reaction force and connection capacity of tie -down systems for a TLP and SPAR are investigated . The environmental conditions are taken from the API Bulletin 2INT -MET which has been updated after several major storms during 2004 -2005 . The hydrodynamic coefficients of the TLP and SPAR are obtained using a 3D diffraction /radiation panel method . The motions of the TLP and SPAR are then simulated in the time domain by using the hull -mooring -riser coupled dynamic analysis tool CHARM3D . Based on the simulated motion and acceleration time series , the inertial and gravity loads on derrick and skid base footing are calculated . In addition to the inertial -gravity loads , wind forces exerted on the derrick are also calculated . All the external forces and resultant hull motions are simulated for 100 -year , 200 -year and 1000 -year storms to observe the derrick structural integrity with increasing environmental intensity . Various environmental headings are also considered to find the maximum reaction forces . In the present method , the phase differences between gravity -inertia forces and wind forces are taken into consideration to obtain more realistic loads on derrick and skid base footings . This research shows that the maximum and minimum load values are appreciably higher for the SPAR . In addition , the direction of external forces is also important to determine maximum reaction forces on footings . The capacities of the clamps in slip , bolt tension , and bolt shear can be also analyzed using the resultant data to provide guidance on appropriate design values .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -05 -691
Date: 2010-01-16

Citation

Loads on Tie-Down Systems for Floating Drilling Rigs during Hurricane Conditions. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -05 -691 .

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