OTL performed a reconfiguration design of the DAP by 1) Optimizing the jacket structural members to ensure that the submerged lifting weight remained within the 4000 tons hook load capacity of an HLV; 2) increasing the diameter of main pile to 84” and designing skirt pile sleeve connection to accommodate 66” diameter skirt pile. The max design penetration of 59 m and 53 m for main pile and skirt pile respectively, within the pile penetration limit. The DAP is located at water depth of 37.4 m.

OTL performed a reconfiguration design of the CGP by 1) widening the slot width to 50 m (c/c); 2) optimizing the jacket structural members to ensure that the submerged lifting weight remained within the 4000 tons hook load capacity of an HLV; and 3) increasing the diameter of main piles to 90”, while designing skirt pile sleeve connection to accommodate 60”  diameter skirt pile. The max design penetration of 60 m for both main piles and skirt piles based on the pile drivability analysis result. The CGP is located at water depth of 36.7 m.

OTL performed a reconfiguration design of the CDCP; specific measures included: 1) removing four buttress piles while simultaneously increasing the diameter of the main piles and widening the slot width to 53 m (c/c) to accommodate the 49 m vessel width; 2) optimizing the jacket structure members to ensure that the submerged lifting weight remained within 3500 tons. The CDCP is located at water depth of 15.94 m.

OTL performed the re-configuration design to change LQ8S topside installation method and use float-over operation instead of the original two modulus lifting operation and reconfigured the jacket design to adopt a horizontal lifting operation and the jacket open space to accommodate the Holman Atlantic vessel. LQ8S platform is located at water depth of 64.9 m.

OTL performed the re-configuration design for the CP8S topside and jacket to accommodate the new vessel of Super X-class for topside float-over operation and H-591 for Jacket installation operation, including in-place and preservice analyses and other miscellaneous calculations. CP8S platform is located at water depth of 64.5 m.

OTL performed the engineering detailed design for the PG-HA-PIT-A jacket, including in-place and preservice analyses and other miscellaneous calculations. PG-HA-PIT-A is located at water depth of 125 m.

OTL performed the engineering detailed design for the PG-HA-PIT-A jacket, including in-place and preservice analyses and other miscellaneous calculations. PG-HA-PIT-A is located at water depth of 125 m.

OTL performed LF12-3 Jacket FEED design and analysis, included all in-place analysis and other miscellaneous calculations. LF12-3 DPP is located at the water depth of 240.8m.

OTL performed LH11-1 Jacket third party independent verification, included in-place and pre-service analyses and other miscellaneous calculations. LH11-1 DPP is located at the water depth of 325 m.

OTL performed jacket optimized design based on iterated analysis results. The original preliminary dry weight of the jacket is around 7000 m.tons, and it is to be installed with a crane vessel  (DLS4200) with the lifting capacity of 3000 m.tons @ the radius of 44 m. The technical solution is to optimize the jacket configuration, reduce the jacket weight and increase the jacket buoyancy and design additional buoyancy boxes to meet the crane lifting capacity requirement.

OTL performed jacket and topside optimization design based on iterated analysis results. The jacket lift weight after optimization is reduced significantly and ensure its total lift weight being less than the required 1700 MT and save around 430 MT jacket steel weight. Also after optimization, the weight of the topside structure is reduced by around 600 MT.  The TP-13 platform is located at the water depth of 49.1 m.

OTL performed NQL jacket configuration design. Two jacket configurations (horizontal lift/upending option and launch option) have been proposed based on available crane vessel and launch barge.  The platform is located at the water depth of 65.5 m.

OTL performed LF14-4 Jacket third party independent verification, included in-place and pre-service analyses and other miscellaneous calculations. LF14-4 DPP is located at the water depth of 144.3 m.

OTL performed LF15-1 Jacket third party independent verification, included in-place and pre-service analyses and other miscellaneous calculations. LF15-1 DPP is located at the water depth of 284.2 m.

OTL performed the compliant piled tower (CPT) pre-feed study at water depth of 330 m, including complete in-place and pre-service analyses, miscellaneous calculations and the whole-set of structural and installation drawings. The work evidences that CPT concept in general is valid for application in South China Sea with water depth 330 m and deeper.

OTL performed the engineering detailed design for the Tekel-A jacket, including in-place and pre-service analyses.

Successfully completed basic design for two heavy deepwater jackets- one drilling platform (PP-PIT-A) and one power generation/accommodation platform (PG/H-PIT-A) as well as a bridge connecting the two structures.

Performed the repair engineering of a deepwater jacket that has been in service for 15 years. OTL investigated the extent of fatigue damage to the jacket, the means to repair it, and the installation method necessary for the repairs. 

Performed various analyses to justify whether the old jackets are still in operational condition after 25 years of service. Developed mitigation plan in order to resolve issues.

OTL performed load-out, transportation, launch, floatation, upending, and on-bottom stability analyses. Additionally, OTL revised and optimized the jacket design.