The objective of the project was to analyze all aspects related to installation of IWOCS System on WEST Alpha drilling rig during yard stay in 2013. Essential feature of this project was a short delivery time and design work parallel to fabrication and on-site installation.
Main tasks included in the project’s scope of work were:
- Preparing location plan for new equipment which need to be highly ergonomic for the crew and operating personnel,
- Safety analysis during installation and operational phase,
- Establish best installation routes to minimize modifications on the rig,
- Design connection of banana sheave with derrick structure,
- Strength verification of derrick’s structural elements,
- Clash check for equipment and cables,
- Structural analysis of existing and new structural elements (decks, foundations),
- Design of foundations for new equipment.
After first survey, following location of the equipment was established and accepted by the client:
- TH Reel – located on reel deck on the PORT side of the rig,
- Workshop container – located on the POSTR side girder box,
- HPU container, GA office container, control room container, return tank and HPU flashing unit – located on the well test deck,
- XT reel – located on AFT side of the rig.
Approved location for XT reel required a new platform, which was designed as a small deck supported on columns, that have a base on a lower deck. The platform is also connected to steel bulkhead with use of small consoles. Whole structure and XT reel is protected against accidental impact with a set of bumpers bolted to platform’s main beams. The platform is also equipped with handrails and an access ladder.
Other elements of IWOCS System are supported on foundations in form of steel frames, laid down on the deck and connected to the deck plate with usage of doubling plates and sea fasteners. Containers are connected to the steel foundation with ISO locks.
To minimize installation time, all new structures were designed as a single lifted element, which simplified whole process. Installation was performed under the supervision of NAVIC Engineering.