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ENSCO 8502

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

ENSCO 8502 is a mobile offshore drilling unit. The Coast Guard has recorded 9 inspections since 2011, most recently in October 2014, along with 29 deficiencies — 4 with no resolution recorded — and 1 operational control.

Records from 2011 to 2014. Most recent: operational control imposed, 5 November 2014.

Built
Not recorded
Last inspected
17 October 2014
Documentation
Not in the documentation file of 10 September 2026
Inspections
9
Deficiencies
29 recorded · 4 without a recorded resolution
Controls
None recorded without a removal date

Identity

US Official No.
—
IMO number
8769597 View on MarineTraffic leaves Maury; a third-party site, nothing from it is stored here
Call sign
A8QU5
MISLE id
1064204
Flag
LIBERIA
MMSI
—
Maury page id
psix-1064204

Inspections, by type

…physical examinations1
…administrative events4
…with no type recorded1
…past their stated due date3
Years with a record 3 calendar years (2011–2014)
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 12 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 it19377 - Convention (Subpart B), Gross Ton
19377 - Displacement, Net Ton
5813 - Dead Weight, Net Ton
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.

Inspection history · 9

17 October 2014 Damage Survey · Deficiency Check · Administrative Inspection
Physical examination · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 5008600
16 October 2014 Type not recorded
No type recorded · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 5009962
23 June 2014 Administrative Inspection
Administrative · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4897064
23 June 2014 Administrative Inspection
Administrative · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4897229
10 June 2014 COC-MODU Renew
Type not classified · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4874649
24 March 2014 Administrative Inspection
Administrative · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4822206
14 June 2012 COC-MODU Renew
Type not classified · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4344005
26 January 2012 Administrative Inspection
Administrative · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4232452
27 July 2011 COC-MODU Annual
Type not classified · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 4137244

Deficiency record · 29

Fire Fighting › Structural - A Class Divisions › Fire Doors
Issued 28 October 2014 Resolved
Openings in rated fire boundaries are to retain the integrity of the boundary in case of fire. Observed numerous trays/pans below roll-down fire shutter for Scullery. Items would prevent full closure of the shutter in case of thermal release & boundary integrity would not be maintained. Ensure that the areas in the path of the Galley/Scullery roll-down fire shutters remain clear. 89 MODU 9.1.8
Action required: 705 - Other - as specified
Resolved 4 November 2014
Resolution: Moved trash cans to gain better access to the ''''''''window'''''''' to reach over the ledge & installed SS angle to prevent placing items on the counter/ledge beneath the shutter.
Engineering › Electric Propulsion System › Bus
Issued 20 October 2014 Resolved
Provide root cause analysis to [name withheld] & CG Marine Safety Center for known failures on ENSCO 8502 that have resulted in loss of position, EDS and/or total loss of thrust.
Action required: 705 - Other - as specified
Due 28 October 2014
Resolved 28 October 2014
Resolution: Provided root cause analysis to [name withheld] & CG Marine Safety Center for known failures on ENSCO 8502 that have resulted in loss of position, EDS and/or total loss of thrust.
Engineering › Electric Propulsion System › Bus
Issued 20 October 2014 Resolved
Revise FMEA to include open bus operations and address the failure that resulted in the loss of position and emergency disconnect. Provide a copy of the Flag State/RO approved FMEA to [name withheld] and CG Marine Safety Center for acceptance.
Action required: 705 - Other - as specified
Resolved 25 November 2014
Resolution: Revised FMEA to include open bus operations and address the failure that resulted in the loss of position and emergency disconnect. Provide a copy of the Flag State/RO approved FMEA to [name withheld] and CG Marine Safety Center for acceptance.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Perform test recreating conditions leading to the loss of position and demonstrate system will maintain station with PLS enabled.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Demonstrated system will maintain station with PLS enabled.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Perform test recreating conditions leading to the loss of position and demonstrate system will maintain station with PLS disabled.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Demonstrate system will maintain station with PLS disabled.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Perform generator failure test with two generators on Bus A and two generators and Bus B (split bus) at 40% load, PLS disabled and demonstrate that it does not result in the loss of the other generator.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Performed generator failure test with two generators on Bus A and two generators and Bus B (split bus) at 40% load, PLS disabled and demonstrated that it does not result in the loss of the other generator.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Repeat test 6 at 45% load and demonstrate that it does not result in the loss of the other generator.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Repeated test 6 at 45% load and demonstrated that it does not result in the loss of the other generator.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Repeat test 7 increasing the load in 5% steps until the PMS is unable to maintain the online generator to determine maximum safe loading.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Repeated test 7 increasing the load in 5% steps until the PMS is unable to maintain the online generator to determine maximum safe loading. Found the failure point to be between 45 and 50%.
Engineering › Electric Propulsion System › Holding and Release Circuitry
Issued 20 October 2014 Resolved
Perform necessary modifications to PMS settings (e.g. power limiting, standby start, emergency start) to prevent generator loading from exceeding the maximum safe loading determined in test 8 and demonstrate.
Action required: 705 - Other - as specified
Resolved 27 October 2014
Resolution: Performed necessary modifications to PMS settings (e.g. power limiting, standby start, emergency start) to prevent generator loading from exceeding the maximum safe loading determined in test 8 and demonstrated.
Engineering › Electric Propulsion System › Bus
Issued 17 October 2014 Resolved
During the FMEA/Power Management trials conducted from November 3, 2014 - November 5, 2014 the vessels power management system failed to operate as required by ABS Rules. Prove the power management system operates as required by ABS Rules.
Action required: 17 - Rectify deficiencies prior to departure
Resolved 25 November 2014
Resolution: Proved the power management system operates as required by ABS Rules.
Engineering › Electric Propulsion System › Bus
Issued 17 October 2014 Resolved
When the operator controls were placed in manual control and the thrusters were manually operated (Annual FMEA Trials Test 6.1) and advertent act was found to lead to a critical condition (Black out of "B" Bus). Prove that joystick control does not cause a critical condition.
Action required: 17 - Rectify deficiencies prior to departure
Resolved 25 November 2014
Resolution: Prove that joystick control does not cause a critical condition.
Engineering › Electric Propulsion System › Semiconductor Rectifier Circuitry
Issued 17 October 2014 No resolution recorded
While running annual FMEA trials test 7.4 the Semi-Conductor Rectifiers (SCR) were found to overheat anywhere from 5 minutes to 11 minutes once the test was started. Troubleshoot and repair the overheating issues with the SCRs.
Action required: 17 - Rectify deficiencies prior to departure
Navigation › Electronic Positioning › GPS/DGPS Receiver
Issued 17 October 2014 Resolved
While running FMEA proving trials test DP 10 the hydro-acoustic system failed 1 out of 5 times (20%). Troubleshoot and repair the hyrdo-acoustic system (debug error on boot sequence and master-to-master conflict).
Action required: 17 - Rectify deficiencies prior to departure
Resolved 25 November 2014
Resolution: Troubleshot and repaired the hyrdo-acoustic system.
Engineering › Electric Propulsion System › Bus
Issued 17 October 2014 Resolved
Update the FMEA/power management trials, test the same in the presence of the RO and then contact [name withheld] to Witness the FMEA/power management trials.
Action required: 17 - Rectify deficiencies prior to departure
Resolved 25 November 2014
Resolution: Updated the FMEA/power management trials, tested the same in the presence of the RO and then contacted [name withheld] to witness the FMEA/power management trials.
Fire Fighting › Ventilation Systems › Duct Hatches
Issued 11 June 2014 Resolved
Numerous exterior vent closures around the accomodations were found to be inaccessible for closure. Provide fixed ladders or alternate means of closure for elevated/inaccessible closures for systems without fire dampers installed. Cite 89 MODU 9.2.7. Action 50a,b,c.
Due 10 July 2014
Resolved 23 September 2014
Resolution: Received documentation showing satisfactory completion. Routine updates provided for the large work scope. Fixed ladders were installed for access to each vent closure. Also witnessed completion while onboard for separate matters late Oct/early Nov 2014.
Fire Fighting › Structural - A Class Divisions › Fire Doors
Issued 10 June 2014 No resolution recorded
Class "A" division stairway doors and various class "A" division doors throughout the rig need to be self-closing. Stairways which penetrate only a single deck should be protected at least at one level by "A" or "B" class divisions and self-closing doors so as to limit the rapid spread of fire from one deck to another. Cite 89 MODU 9.2.3. Action Due 90-Days.
Due 10 September 2014 — due date passed with no resolution recorded
Engineering › Diesel Engine (propulsion/auxiliary-electric) › Overspeed Device
Issued 10 June 2014 No resolution recorded
Could not verify set-point of the emergency diesel generator. Overspeed was tested and actuated without the ability to verify speed setting for actuation. Prove overspeed set-point and provide procedure for future testing. Cite 89 MODU 4.2.3. Action 50a,b,c.
Due 10 July 2014 — due date passed with no resolution recorded
Fire Fighting › Means of Escape › Stairways
Issued 10 June 2014 Resolved
Provide safe means of egress from the ROV control van. Interior steps are present but no outside steps are present. Cite 89 MODU 9.3.1.3. Action 50a,b,c.
Due 10 July 2014
Resolved 24 June 2014
Resolution: Exterior steps provided/in place.
Engineering › Diesel Engine (auxiliary) › Injector (fuel injection)
Issued 10 June 2014 Resolved
Emergency generator fuel tank level was approximately 60% of capacity. Ensure adequate fuel is maintained in the tank at all times to meet minimum run time in accordance with 1989 IMO MODU Code. Cite 89 MODU 5.3.6. Action 40a,b,c.
Due 17 June 2014
Resolved 17 June 2014
Resolution: Fuel level corrected/run-time calculations provided.
Engineering › Bilge Water Management System › Pump
Issued 10 June 2014 Resolved
Bilge pump for Thruster Room #6 would not automatically actuate via hi/hi bilge alarm. Prove proper operation of the bilge pump. Cite 89 MODU 4.8.1. Action 40a,b,c.
Due 17 June 2014
Resolved 24 June 2014
Resolution: Switch replaced & pump operating as designed.
Engineering › Sea-water System (primary cooling) › Sea Chest
Issued 10 June 2014 No resolution recorded
Repair pin hole in sea chest air line in the starboard aft pump room. Pin hole is located between a normally opened and a normally closed valve and is currently seeping. Affect permanent repair in accordance with class requirements. Cite 89 MODU 4.1.3, 3.6.1. Action 16a,b,c.
Due 24 June 2014 — due date passed with no resolution recorded
Pollution Prevention/Response › Prevention Equipment › Oily Water Separator (15 ppm)
Issued 10 June 2014 Resolved
Create procedures for testing OWS and ensure crew is trained. Instructions as to the operation of the system shall be in accordance with an operational manual approved by the administration. Cite MARPOL Annex I/31. Action 50a,b,c.
Due 10 July 2014
Resolved 24 June 2014
Resolution: Documentation received showing satisfactory completion.
Fire Fighting › Structural - A Class Divisions › Fire Doors
Issued 10 June 2014 Resolved
Numerous fire doors throughout the rig were found to be not closing under their own power. Adjust self-closing fire doors to ensure full closing under own power. Cite 89 MODU 9.1.8. Action 40a,b,c.
Due 17 June 2014
Resolved 17 June 2014
Resolution: Documentation provided showing satisfactory completion.
Lifesaving › Lifeboat › Self-contained Air Support System
Issued 14 June 2012 Resolved
Air leak in supply line from tank in #3 lifeboat
Condition: Improper/Lack of Maintenance
Due 21 July 2012
Resolved 10 July 2012
Resolution: air line replaced
Lifesaving › Lifebuoys › Self-igniting Lights
Issued 14 June 2012 Resolved
missing lights w/lifering buoys @ lifeboat stations--placards show lights, either add lights or replace placards...
Condition: Improper Installation
Due 21 July 2012
Resolved 10 July 2012
Resolution: lights added to lifering buoys @ lifeboat stations.
Lifesaving › Lifeboat › Seating
Issued 14 June 2012 Resolved
Seating in L/Bs blocked due to improper stowage of gear, all gear to be stowed to make all necessary seats available.
Condition: Improper Installation
Due 21 July 2012
Resolved 10 July 2012
Resolution: Gear properly stowed in lifeboats.
Lifesaving › Lifeboat › Self-contained Air Support System
Issued 27 July 2011 Resolved
Replace positive pressure air gauge in lifeboat #2. Upon replacement provide pressure of each bottle (3) to [name withheld].
Action required: 705 - Other - as specified
Resolved 30 August 2011
Resolution: Received e-mial and picture documentation attesting to the satisfactory completion of documentation.
Lifesaving › Lifebuoys › Self-Activitating Smoke Signals
Issued 27 July 2011 Resolved
Replace life rings for smoke stations/quick release boxes with bridge buoys.
Action required: 705 - Other - as specified
Resolved 30 August 2011
Resolution: Received e-mial and picture documentation attesting to the satisfactory completion of documentation.
Lifesaving › Lifebuoys › Buoyant Lifeline
Issued 27 July 2011 Resolved
Replace line on life rings and life ring attachments with black or UV resistant line.
Action required: 705 - Other - as specified
Resolved 30 August 2011
Resolution: Received e-mial and picture documentation attesting to the satisfactory completion of documentation.

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.