BUILDER: MARATHON / LETOURNEAU CO.

BUILD LOCATION: VICKSBURG, MISSISSIPPI

BUILD YEAR: 1977

 

B.  UNIT RATINGS

Maximum Drilling Depth                                                     25,000 ft

Maximum Water Depth                                                     250 ft / 343 ft Legs (can leg-up to 433 ft) including tide and

25 ft leg penetration

Minimum Water Depth: 28 ft Transit, 20 ft Harbor Draft

Towing Requirements                                                       

12,000-HP Min. (smallest vessel may be no less than 6,000-HP)                                  

Normal Towing Draft: 27.5 ft

Quarters: 91 Men – exclusive of 6-Man Hospital Room, Galley, Recreation Facilities.

 (5) (1)-Man Rooms with private baths and (43) (2)-Man Rooms with semi-private baths.

 

C.  CERTIFICATION

Certifying Authority : American Bureau of Shipping

Classification of Hull : American Bureau of Shipping

Vessel Class +A-1 Self-Elevating Drilling Unit

Loan Line Certificate : 2006

 

D.  DESIGN CRITERIA

  Dimensions:

Length : 247.58 ft

Width : 200.5 ft

Depth of Hull : 26.00 ft

Number of Leg : [3]

Leg Length : 343 ft

Leg Cross Section : 32 ft sq

Spud Tank Section : 23.85 ft

Spud Tank Cross Section : 46 ft

Leg Spacing : 142 ft Center of Port Leg to Center of Stbd. Leg

Cross Tons :  7,221

Net Tons : 7,106

Lightship Displacement : 18,195.78 Kips / Adjustment

Maximum Load Displacement : 21,189.40 Kips

Maximum Variable Load : 3,039.27 Kips

Supplemental Variable : 1,500.00 Kips

Maximum Variable Load : 4,539.27 Kips

Maximum Allowable Load on Substructure : 1,250 Kips

NOTE: Maximum allowable load on Substructure is carried separately from the Maximum Variable Load

Substructure Design Criteria:

Loads                               Drilling                         Waiting                     Survival

Hook Load                 566 Tonnes                  566 Tonnes                  0 Tonnes

Rotary Load                500 Tonnes                  500 Tonnes                  0 Tonnes

Setback Load              225 Tonnes                  225 Tonnes                  0 Tonnes

These Loads have been established considering the following environmental conditions in the North Sea:

Drilling : Maximum of 50 ft Seas w/ 70 Knot Wind Gusts

Waiting :Maximum of 50 ft Seas w/ 70 Knot Wind Gusts

Survival : Maximum of 60 ft Seas w/ 90 Knot Wind Gusts

Substructure : 10 ft Transverse to Port of Starboard of Center

LOADING

Maximum Deck Loading

Main Deck : 500 lbs / sq ft

Machinery Deck : 500 lbs / sq ft

Pipe Rack : 5,000 lbs / linear ft

Pre-Load

Available Capacity :10,231 Kips

Minimum Reaction : 10,930 Kips

Maximum Reaction : 11,030 Kips

Maximum Reaction (required elevated storm)     7,063 Kips