General Overview of the construction process of a Jackup Rig:

Pre-fabrication starts with the bottom plate tank top compartments from the center blocks starting with the Mud Pump Room Double Bottom followed by the Main Generator Room and Mud Pits. Next to be pre-fabricated are the Machinery Deck panels and Main Deck panels. Upon completion, they will be transferred to the block assembly and launching area for erection and keel laying.

When the pre-fabrication of the center blocks are near completion, the pre-fabrication of the blocks for the sack storage room, machinery room, etc will commence. Erection of the respective blocks forming the rig’s Main Hull will follow working their way from the center blocks to form the complete Main Hull. Wing tank blocks will be fabricated and erected on site.

The spud cans will be fabricated in panels and assembled as a complete unit within the vicinity of the Main Hull. Upon completion, the whole spud can unit is elevated to its actual location and set in position. The lower leg sections are then aligned and joined to the spud cans.

Fabrication activities of leg sections will be carried out in the leg fabrication jigs. Completed leg sections, pre-fabricated in specific length will be blasted/final coated before erection. They will be transferred to within reach of the platform ringer crane. The completed leg sections will be joined to predetermined lengths, painted at the joints and later erected on to the Main Hull. Leg sections that are beyond the reach of the platform ringer crane will be erected by using the skidding method, a time and tried procedure.

Upon completion of the tank top block erections, major equipment installation like the main generators, mud pumps, etc shall be carried out progressively after completion of structural foundation works. After completion of Main Deck plate structural work including structural foundations and crane pedestals, equipment installation on the Main Deck will be carried out progressively.

The Living Quarters with the aluminum Helicopter Deck, Upper Guide with braces/jack frames, Lower Guide structures and the Cantilever Securing Structures will form part of the Main Hull prior to launching. Sections of the leg will be erected/welded to the spud cans and attached to the hull by the pinions of the jacking system.

The completed Living Quarters’ structure components will be erected onto the Main Hull to form the complete LQ. When the trussed supports of the helicopter deck have been welded on, the helicopter pancake will be installed.

The completed Wing Tanks blocks will be erected onto the main hull structure to complete the entire rig hull assembly.

The main hull shall be launched into the sea with sufficient leg lengths installed. The cantilever and drill floor will also be installed prior to launching. The derrick will be installed right after the rig is launched. Remaining leg sections are installed onto the rig at the leg erection station.

 For the erection of the last sections of the legs, the rig will be jack up to the last joint and a skid over operation of the last leg sections will be carried out.

Testing and commissioning shall then ensue after mechanical and electrical completion (MC & EC).Drilling systems integration tests will be carried out prior to delivery.