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TRANSWORLD RIG 50

Mobile Offshore Drilling Unit · Offshore class · Built 1960s · USCG Heartland District (CGD-H)

TRANSWORLD RIG 50 is a 1965 mobile offshore drilling unit. The Coast Guard has recorded 9 inspections since 1981, most recently in May 1986, along with 29 deficiencies.

Records from 1981 to 1986. Most recent: inspection, 28 May 1986.

Built
1965
Last inspected
28 May 1986
Documentation
Not in the documentation file of 10 September 2026
Inspections
9
Deficiencies
29 recorded · 0 without a recorded resolution
Controls
None recorded without a removal date

Identity

US Official No.
—
IMO number
—
Call sign
—
MISLE id
52811
Flag
UNITED STATES
MMSI
—
Maury page id
psix-52811

Inspections, by type

…physical examinations2
…administrative events1
…with no type recorded6
Years with a record 5 calendar years (1981–1986)
The 9 inspections in the strip above, split by the kind of activity the US Coast Guard recorded. Years with a record are calendar years in which a record exists, not years in service. What Maury does not do.

This record may be incomplete: the most recent inspection recorded for this vessel was 40 years ago. Maury shows what the Coast Guard recorded, not whether the vessel has been inspected since, is still in service, or what condition it is in. Coast Guard record current through 13 September 2026, retrieved 18 September 2026 from PSIX. Every field on this page was recorded by the Coast Guard. Records for the Offshore class in Maury's sources begin in 1978.

Documentation record

Tonnage as PSIX records itNot recorded
This hull's Official Number is not in the NVDC file dated 10 September 2026 as served by NOAA Fisheries, so no documentation record is shown. Absence from that file is a fact about the file, not about the hull.

Radio station licence

No FCC ship-station licence is recorded against this Official Number in the file of 6 September 2026. That is a fact about the licence file, not about the radio.

A report is not offered for this hull: Its record holds only 2 of the seven kinds of material a report is built from: inspections, deficiencies, operational controls, tow-unit appearances, casualty records, dimensions and documentation. That is a statement about the record, not about the vessel. Reports.

Inspection history · 9

28 May 1986 Type not recorded
No type recorded · MIO NEW ORLEANS · USCG Heartland District (CGD-H) · Activity 1297950
24 April 1986 Type not recorded
No type recorded · MSO Mobile · USCG Heartland District (CGD-H) · Activity 1000522
8 November 1985 Deficiency Check
Physical examination · MSO Mobile · USCG Heartland District (CGD-H) · Activity 1301510
17 October 1985 Deficiency Check · COI Inspection
Physical examination · MSO Mobile · USCG Heartland District (CGD-H) · Activity 1296388
20 September 1985 Credit Drydock
Administrative · MSO Mobile · USCG Heartland District (CGD-H) · Activity 1296374
11 January 1984 Type not recorded
No type recorded · MIO NEW ORLEANS · USCG Heartland District (CGD-H) · Activity 1278718
17 October 1983 Type not recorded
No type recorded · MIO NEW ORLEANS · USCG Heartland District (CGD-H) · Activity 970392
16 September 1983 Type not recorded
No type recorded · MIO NEW ORLEANS · USCG Heartland District (CGD-H) · Activity 1273518
4 September 1981 Type not recorded
No type recorded · MSO PORT ARTHUR · USCG Heartland District (CGD-H) · Activity 1272400

Deficiency record · 29

Lifesaving
Issued 17 October 1985 Resolved
UNTIL ONE ADDITIONAL DAVIT LAUNCHED LIFERAFT IS PROVIDED ON BOARD FOR -20- PERSONS (-80- PERSONS TOTAL) THE NUMBER OF PERSONS ALLOWED ON BOARD IS REDUCED TO -37- VICE -42-
Condition: Unknown
Due 17 October 1987
Resolved 18 May 2002
Resolution: MISLE Maintenance - Resolved all open deficiencies issued prior to 6/1/1997 where activity was closed and deficiency due date was past
Construction/Loadline
Issued 17 October 1985 Resolved
AT THE MOVE FOR CAUSE THE RIG MUST BE FRY DOCKED AND PERMANENT REPAIRS MADETO ALL HURRICANE DAMAGE ON TRANSWORLD DRILLING LETTER TO [name withheld] 17SEP85.
Condition: Unknown
Due 17 October 1987
Resolved 18 May 2002
Resolution: MISLE Maintenance - Resolved all open deficiencies issued prior to 6/1/1997 where activity was closed and deficiency due date was past
Fire Fighting
Issued 17 October 1985 Resolved
REPAIR #2 DEEPWELL FIRE PUMP AND DEMONSTRATE OPERATION OF BOTH FIRE PUMP RELIEF VALVES.
Condition: Unknown
Due 17 October 1985
Resolved 17 October 1985
Electrical
Issued 17 October 1985 Resolved
PROVIDE A USCG MMT APPROVED HAZARDOUS LOCATION BLUEPRINT ON BOARD THE RIG.
Condition: Unknown
Due 17 October 1985
Resolved 17 October 1985
Electrical
Issued 17 October 1985 Resolved
PROVIDE CLASS 1 DIVISION 2 EXPLOSION PROOF FITTINGS THOROUGHOUT THE MUD PUMP ROOM OR COMPLY WITH 46CFR108.175 CONCERNING THE DOOR CONNECTION THIS SPACE TO THE MUD PIT ROOM.
Condition: Unknown
Due 17 October 1987
Resolved 18 May 2002
Resolution: MISLE Maintenance - Resolved all open deficiencies issued prior to 6/1/1997 where activity was closed and deficiency due date was past
Electrical
Issued 20 September 1985 Resolved
PROVIDE HAND TACH FOR TESTING OVERSPEED TRIP ON #2 D.C. GENERATOR.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Electrical
Issued 20 September 1985 Resolved
WITHIN ONE WEEK OF INSTALLITION, TEST OVERSPEED TRIP ON STANDBY A.C GENERATOR.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Lifesaving
Issued 20 September 1985 Resolved
REMOVE NON DAVIT LAUNCH FLOAT FREE LIFERAFT FROM LIFERAFT STATION #1.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Lifesaving
Issued 20 September 1985 Resolved
PERMANENTLY REPAIR RESCUE BOAT MOTOR CONTROLS.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Lifesaving
Issued 20 September 1985 Resolved
NUMBER OF PERSONS ON BOARD IS LIMITED TO -20- VICE -42- UNTILL TWO ADDITIONAL DAVIT LAUNCHED LIFERAFTS ARE PROVIDED ON BOARD FOR -40- PEOPLE.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Construction/Loadline
Issued 20 September 1985 Resolved
AT THE NEXT MOVE THE RIG MUST BE DRYDOCKED AND PERMANENT REPAIRS MADE TO ALL HURRICAN DAMAGE TO MAT TANKS.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Electrical
Issued 20 September 1985 Resolved
AFTER INSTALLATION OF #1 A.C. GENERATOR DEMONSTRATE OPERATION OF #1 OVERSPEED AND LOW LUBE OIL PRESSURE TRIPS AND REVERSE POWER RELAYS ON #1 AND #2 A.C. GENERATORS.
Condition: Unknown
Due 17 October 1987
Resolved 18 May 2002
Resolution: MISLE Maintenance - Resolved all open deficiencies issued prior to 6/1/1997 where activity was closed and deficiency due date was past
Lifesaving
Issued 20 September 1985 Resolved
UNTIL ONE ADDITIONAL DAVIT LAUNCHED LIFERAFT IS PROVIDED ON BOARD FOR -20- PERSONS (-80- PERSONS TOTAL) THE NUMBER OF PERSONS ALLOWED ON BOARD IS REDUCED TO -37- VICE -42-
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Engineering
Issued 20 September 1985 Resolved
REPLACE RELIEF VALVE ON LOWER AIR RECIEVER IN AIR COMPERSSOR.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Lifesaving
Issued 20 September 1985 Resolved
PROVIDE GRIPES TO STOW RESCUE BOAT AND LASH DOWN.
Condition: Unknown
Due 20 September 1985
Resolved 20 September 1985
Electrical
Issued 16 September 1983 Resolved
REPAIR EMERGENCY LIGHT ON PORT SIDE OF MUD PIT ROOM.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Electrical
Issued 16 September 1983 Resolved
FILL EYS FITTING ON PORT SIDE JUNCTION BOX TO OUTLET IN MUD PIT ROOM.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Electrical
Issued 16 September 1983 Resolved
REPAIR AND TEST IN PRESENCE OF A COAST GUARD INSPECTOR ALL VENTILATION SHUTDOWNS.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Deck/Cargo
Issued 16 September 1983 Resolved
REPAIR EXHAUST LEAKS ON CEMENT SYSTEM AND MAIN ENGINES LOCATED AT TOP OF NUMBER THREE (3) PODHOUSE.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Unknown
Issued 16 September 1983 Resolved
PROVIDE APPROVED RELIEF VALVES WITH HAND OPERATING DEVICE FOR POTABLE WATER, SANITARY WATER TANKS AND FOR AIR RECEIVER LOCATED BELOW DECK.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Unknown
Issued 16 September 1983 Resolved
REPAIR AND ADJUST ALL DOOR CLOSERS TO MUD PIT ROOMS.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Unknown
Issued 16 September 1983 Resolved
PROVIDE APPROVAL PRINT OF MUD PUMP DISCHARGE PIPING, EXPANSION JOINT IN LINE.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Fire Fighting
Issued 16 September 1983 Resolved
REPAIR GENERAL ALARM BELL/SIREN LOCATED IN DC GENERATOR ROOM.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Unknown
Issued 16 September 1983 Resolved
THE FOLLOWING DEFICIENCIES PERTAIN TO THE MODU TRANSWORLD RIG 50, CG000089.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Unknown
Issued 16 September 1983 Resolved
PROVIDE VISUAL INDICATOR FOR PURGE AIR OR ALARM FOR LOSS OF PURGE AIR TO DRILLER'S CONSOLE.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Lifesaving
Issued 16 September 1983 Resolved
PROVIDE REQUIRED RETROREFLECTIVE TAPE AND LIGHTS FOR THE REMAINDER OF PFD'S ON BOARD.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Electrical
Issued 16 September 1983 Resolved
MAKE SUITABLE FOR HAZARDOUS LOCATIONS ALL ELECTRICAL CONNECTIONS WITHIN A FIVE (5) FOOT RADIUS OF THE MUD PIT DOORS.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Lifesaving
Issued 16 September 1983 Resolved
SERVICE TWO (2) DAVIT LAUNCNED LIFE RAFTS ON STARBOARD SIDE.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983
Electrical
Issued 16 September 1983 Resolved
REPAIR EMERGENCY SHUTDOWN LOCATED ON DRILLER'S CONSOLE FOR MUD PUMPS AND DRAWWORKS.
Condition: Unknown
Due 16 September 1983
Resolved 16 September 1983

Ownership record

The Coast Guard's documentation record for this hull -- the Abstract of Title, with its owners and liens as filed -- is not in PSIX. Ask, and Maury buys it from the National Vessel Documentation Center, files it here with its date, and every reader of this page gets it.