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Q4000

Q4000 is a 2002 mobile offshore drilling unit. The Coast Guard has recorded 40 inspections since 2016, most recently in August 2025, along with 18 deficiencies and 16 casualty investigations between 2005 and 2022.

Records from 2005 to 2025. Most recent: inspection, 21 August 2025.

Built
2002
Last inspected
21 August 2025
Documentation
Valid · documentation file of 10 August 2026
Controls
None recorded without a removal date

Coast Guard record current through 23 August 2026, retrieved 5 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 2016.

Inspection record

Last inspected 21 August 2025
…with no type recorded13
Operational controls None recorded without a removal date
Years with a record 10 calendar years (2016–2025)
Every line above is a count of records the US Coast Guard wrote, or a date it recorded. A blank resolution means none was recorded in this data; it does not establish that a deficiency is outstanding. Years with a record are calendar years in which a record exists, not years in service. What Maury does not do.

Identity

8767123
WDM 8543
510836
Flag
UNITED STATES
Maury page id
psix-510836

Documentation record

Registered dimensions (L × B × D)312.3 ft × 184.4 ft × 80.5 ft
Registered tonnagegross 14,802 / net 4,440
ITC dimensions (L × B × D)312.3 ft × 184.4 ft × 80.5 ft
ITC tonnagegross 14,802 / net 4,440
BuilderAMFELS INC · BROWNSVILLE, TX, UNITED STATES · built 2002
Hull materialSteel
PropulsionDiesel Electric
Hull shapeUNSPECIFIED
Hull configurationUNSPECIFIED
Hailing portHOUSTON, TX
Trade endorsementsCoastwise, unrestricted, Registry
DocumentationValid · issued 7 November 2025 · expires 31 December 2026
Service, as the file records itMobile Offshore Drilling Unit
Hull formpowered (Maury's inference from propulsion, hull shape, material and length, rule hf-1; not a recorded fact)
Tonnage as PSIX records it14802 - Convention (Subpart B), Gross Ton
4440 - Convention (Subpart B), Net Ton
11099 - Dead Weight, Metric Ton
22202 - Displacement, Metric Ton
Every line above is a field of the National Vessel Documentation Center's file as served by NOAA Fisheries, dated 10 August 2026, matched to this hull on its Official Number. Registered and ITC measurements are two systems and are never combined. One snapshot is held so far; documentation history begins with the next.
Vessel history report
Every record for this hull, in one document — $299

Every recorded inspection, 2016 to 2026 for this class, in one chronology · every deficiency, with system, dates and resolution · operational controls imposed and removed · every name this hull has been recorded under · the vessels it was inspected alongside, and when · how its record compares with hulls of similar age and size, as a fact about the population and never a judgement about this vessel.

Read one first, in full: a forty-year chronology · a hull that changed operators four times · the sparse case, shown as an example, not for sale.

This report is in development and is not for sale yet. There is no date, and nothing is charged. Leave an email and we will tell you when it exists, once.

Inspected as a tow unit · 1

The Coast Guard recorded this vessel and the following in the same inspection activity — normally a tug and the barges in its tow. A recreational or unclassed hull in the same activity is held and not published, so it does not appear here: these lists are a floor, not a complete manifest.

CAPE DAVIS Industrial Vessel · MISLE 864574 · 30 October 2023 · activity 7932758

Inspection history · 40

21 August 2025 ACP Periodic Oversight · Ballast Water Examination · Periodic Inspection
Physical examination · USCG Heartland District (ocs) · USCG Heartland District (CGD-H) · Activity 8218279
25 July 2025 Administrative Inspection
Administrative · Sector Mobile · USCG Heartland District (CGD-H) · Activity 8194563
9 August 2024 ACP Annual Oversight · Administrative Inspection · Annual Inspection · MTSA/ISPS Verification
Physical examination · USCG Heartland District (ocs) · USCG Heartland District (CGD-H) · Activity 7978113
25 July 2024 Administrative Inspection
Administrative · Sector Mobile · USCG Heartland District (CGD-H) · Activity 7966970
6 March 2024 Type not recorded
No type recorded · Marine Safety Unit Port Arthur · USCG Heartland District (CGD-H) · Activity 7876033
30 October 2023 Type not recorded
No type recorded · Marine Safety Unit Houma · USCG Heartland District (CGD-H) · Activity 7932758
25 July 2023 Administrative Inspection · Annual Inspection · MTSA/ISPS Verification · ACP Annual Oversight · Ballast Water Examination
Physical examination · USCG Heartland District (ocs) · USCG Heartland District (CGD-H) · Activity 7752297
26 April 2023 Type not recorded
No type recorded · Sector Mobile · USCG Heartland District (CGD-H) · Activity 7676358
13 April 2023 Administrative Inspection · Examination of Repairs · In-Service Inspection
Physical examination · Sector Mobile · USCG Heartland District (CGD-H) · Activity 7668510
30 November 2022 Administrative Inspection
Administrative · USCG Heartland District (ocs) · USCG Heartland District (CGD-H) · Activity 7602286
28 October 2022 Type not recorded
No type recorded · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 7598049
5 May 2022 COI Inspection · Ballast Water Examination · MTSA/ISPS Verification
Physical examination · USCG Heartland District (ocs) · USCG Heartland District (CGD-H) · Activity 7444456
11 April 2022 Administrative Inspection · Internal Structural Exam · Examination of Repairs · Underwater Inspection in lieu of Drydock
Physical examination · Sector Mobile · USCG Heartland District (CGD-H) · Activity 7429811
10 April 2022 Type not recorded
No type recorded · Sector Mobile · USCG Heartland District (CGD-H) · Activity 7430145
15 June 2021 MTSA/ISPS Verification · Annual Inspection · ACP Annual Oversight
Physical examination · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 7228244
28 September 2020 Type not recorded
No type recorded · Marine Safety Unit Houma · USCG Heartland District (CGD-H) · Activity 7097815
28 July 2020 MTSA/ISPS Verification · Ballast Water Examination · ACP Annual Oversight · Annual Inspection
Physical examination · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 7023122
26 June 2020 Administrative Inspection
Administrative · Sector Mobile · USCG Heartland District (CGD-H) · Activity 6987737
10 February 2020 ACP Drydock Oversight · Administrative Inspection
Administrative · Sector Mobile · USCG Heartland District (CGD-H) · Activity 6906764
8 November 2019 Type not recorded
No type recorded · Marine Safety Unit Houma · USCG Heartland District (CGD-H) · Activity 6853878
17 July 2019 Type not recorded
No type recorded · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 6759877
13 May 2019 Annual Inspection · ACP Annual Oversight · ISPS II Exam
Physical examination · Marine Safety Unit Texas City · USCG Heartland District (CGD-H) · Activity 6683707
20 November 2018 Type not recorded
No type recorded · Marine Safety Unit Houma · USCG Heartland District (CGD-H) · Activity 6616926
19 October 2018 Administrative Inspection
Administrative · Sector Mobile · USCG Heartland District (CGD-H) · Activity 6565904
17 September 2018 ACP Annual Oversight · Annual Inspection · MTSA Verification
Physical examination · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 6566618
14 March 2018 Type not recorded
No type recorded · Marine Safety Unit Houma · USCG Heartland District (CGD-H) · Activity 6379986
21 September 2017 Type not recorded
No type recorded · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 6277962
30 August 2017 Administrative Inspection
Administrative · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 6255689
10 May 2017 Re-Inspection · ACP COI Oversight
Physical examination · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 6143666
14 April 2017 Type not recorded
No type recorded · Marine Safety Unit Brownsville · USCG Heartland District (CGD-H) · Activity 6142851
11 April 2017 Drydock Exam
Physical examination · Marine Safety Unit Texas City · USCG Heartland District (CGD-H) · Activity 6141821
23 March 2017 Administrative Inspection
Administrative · Marine Safety Unit Texas City · USCG Heartland District (CGD-H) · Activity 6133351
15 January 2017 Administrative Inspection
Administrative · USCG Heartland District · USCG Heartland District (CGD-H) · Activity 6071095
21 December 2016 ACP Periodic Oversight · Re-Inspection · Deficiency Check
Physical examination · Sector New Orleans · USCG Heartland District (CGD-H) · Activity 6065785
12 November 2016 Administrative Inspection
Administrative · USCG Heartland District · USCG Heartland District (CGD-H) · Activity 6039753
12 June 2016 Administrative Inspection
Administrative · USCG Heartland District · USCG Heartland District (CGD-H) · Activity 5904631
12 June 2016 Administrative Inspection
Administrative · USCG Heartland District · USCG Heartland District (CGD-H) · Activity 5910559
11 June 2016 Administrative Inspection
Administrative · USCG Heartland District · USCG Heartland District (CGD-H) · Activity 5904007
16 May 2016 Annual Inspection · MTSA/ISPS Verification · ACP Annual Oversight · Administrative Inspection · Deficiency Check
Physical examination · Marine Safety Unit Morgan City · USCG Heartland District (CGD-H) · Activity 5887283
3 May 2016 Type not recorded
No type recorded · Sector Mobile · USCG Heartland District (CGD-H) · Activity 5867950

Deficiency record · 18

02 - Structural Conditions › N/A - No Subsystem › Other (Structural condition)
Issued 9 August 2024 Resolved
Each launching appliance's structural attachment to the vessel must be designed, based on the ultimate strength of the construction material, to be at least 4.5 times the load imparted on the attachment by the launching appliance and its fully loaded survival craft under the most adverse combination of list and trim under paragraph (b) of this section. Observed wastage on both vertical/diagonal structural members supporting the forward cantilever deck which supports the fwd lifeboats embarkation deck and primary muster location. Provide proof of rectification or repair plan to the satisfaction of the ABS Surveyor.
Condition: Improper/Lack of Maintenance
Action required: 17 - Rectify deficiencies prior to departure
Resolved 10 August 2024
Resolution: Received supporting documentation from the Captain and Class (ABS) Surveyor [name withheld] who confirmed that the repairs for the two code 17 deficiencies are completed and to the satisfaction of the ABS Surveyor as dictated in the report. Uploaded reports
11 - Life Saving Appliances › N/A - No Subsystem › Maintenance of Life Saving Appliances
Issued 9 August 2024 Resolved
Type II retro-reflective material approved under approval series 164.018 must be placed on the boat and meet the arrangement requirements in IMO Resolution A.658(16). Observed retrofrelective tape on all four lifeboats to be no longer reflective. Third party Viking Norsafe was onboard within one week of attendance. Restore retroreflective tape to a satisfactory condition.
Condition: Improper/Lack of Maintenance
Action required: 17 - Rectify deficiencies prior to departure
Resolved 10 August 2024
Resolution: Received supporting documentation from the Captain and Class (ABS) Surveyor [name withheld] who confirmed that the repairs for the two code 17 deficiencies are completed and to the satisfaction of the ABS Surveyor as dictated in the report. Uploaded reports
03 - Water/Weathertight Conditions › N/A - No Subsystem › Ventilators, air pipes, casings
Issued 9 August 2024 Resolved
Appliances to insure weathertight integrity include weathertight doors and hatches, closures for air pipes, ventilators, ventilation intakes and outlets, and closures for other openings in deckhouses and superstructures. Observed two wasted ventilation trunks, one inside thruster room #4 and one outside of thruster room #4 in the neighboring passageway. Restore to a satisfactory condition to the satisfaction of the ABS Surveyor.
Condition: Improper/Lack of Maintenance
Action required: 50 - Rectify deficiencies w/in 30 days
Due 9 September 2024
Resolved 13 September 2024
Resolution: Recieved evidence of repairs and satisfatory RO report from ABS clearing the deficincies.
07 - Fire Safety › N/A - No Subsystem › Division - decks, bulkheads and penetrations
Issued 9 August 2024 Resolved
Each boundary bulkhead and deck that separates an accommodation space or control station from the following must be an A class bulkhead and A class deck respectively—(a) Machinery space;(b) Galley or combination galley and messroom;(c) Main pantry;(d) Classified space;(e) Store room. Observed multiple MCTs failing to be maintained as gas tight, one of which having two holes drilled into the steel to run two wires, and other MCTs not being properly installed with loose wires and/or improper block installation. Conduct survey of vessel to verify proper installation of all MCTs onboard verifying proper installation and verifying integrity of the boundary being maintained. Provide report to the satisfaction of the ABS surveyor and provide rpeort to the USCG Inspector.
Condition: Improper/Lack of Maintenance
Action required: 50 - Rectify deficiencies w/in 30 days
Due 9 September 2024
Resolved 13 September 2024
Resolution: Recieved evidence of repairs and satisfatory RO report from ABS clearing the deficincies.
01 - Certificates & Documentation › 011 - Ships Certificates › Mobile Offshore Drilling Unit Safety
Issued 25 July 2023 Resolved
Each unit should be subject to the surveys specified below; A certificate called a Mobile Offshore Drilling Unit Safety Certificate (1989) may be issued after an initial or renewal survey to a unit which complies with the requirements of the Code. The MODU Q4000 shall not conduct any drilling operations/OCS activities on the Outer Continental Shelf of the U.S until all Annual Class surveys have been completed and the respective surveys are endorsed for annual credit on the statutory certificates including the issuance of a new MODU Safety Certificate according to the provisions of the 1989 MODU Code. Provide proof to Coast Guard via all statutory certificates being endorsed accordingly, a new MODU Safety Certificate issued, and class report/documentation attesting to the class status and findings from recent surveys/dry dock.
Condition: Invalid
Action required: 66 - Prior to drilling or production operations
Resolved 31 July 2023
Resolution: Received class status report and all statutory certificates endorsed accordingly for their annual as well as a new MODU Safety Certificate. All satisfactory.
01 - Certificates & Documentation › 011 - Ships Certificates › Certificate of Inspection (COI)
Issued 29 April 2022 Resolved
Vessel is required to meet the requirements for a dry-dock extension, as outlined in CVC-4 letter dated December 1, 2021. Vessel has yet to meet these requirements, and is prohibited from conducting operations until the dry-dock extension is approved by CG-CVC-4.
Action required: 705 - Other - as specified
Resolved 11 May 2022
Resolution: CVC issued a DD extension
01 - Certificates & Documentation › 013 - Documents › SOPEP
Issued 28 July 2020 Resolved
No proof of annual review of SOPEP was conducted and proof sent to VRP desk were found onboard for 2018 or 2019 as per the approval letter. Conduct review and provide proof of 2020 review. Marpol 73/78 reg 37, 33CFR 151.26. 50 C
Action required: 50 - Rectify deficiencies w/in 30 days
Due 28 August 2020
Resolved 3 August 2020
Resolution: OIM provided proof of completion.
11 - Life Saving Appliances › N/A - No Subsystem › Operation of Life Saving Appliances
Issued 28 July 2020 Resolved
Quarterly launches for LB and RB’s have not been conducted consistently. Only 3 in 24 months. No documentation or proof of attempts were onboard. Launch within 30 days as necessary with time stamp. Provide MOC for plan change to ensure launches are timely and mandate to document attempts.
Action required: 50 - Rectify deficiencies w/in 30 days
Due 28 August 2020
Resolved 31 August 2020
Resolution: Provided documentation of launches.
15 - Safety Management Systems (ISM) › N/A - No Subsystem › Emergency preparedness
Issued 28 July 2020 Resolved
An approved EEP was not onboard as presented. Keep approval letter that references plan onboard and ensure master familiarity of the same.
Action required: 50 - Rectify deficiencies w/in 30 days
Due 28 August 2020
Resolved 3 August 2020
Resolution: Operator provided Approval Letter from Shore for plan in use onboard.
Operations/Management › Lifesaving › Op Readiness/Maintenance/Inspection
Issued 10 May 2017 Resolved
All 4 Lifeboat davits and winches either had missing approval plates, missing their approval number or had the incorrect approval number on the plate. Replace/repair to satisfactory condition.
Condition: Improper Installation
Action required: 705 - Other - as specified
Due 10 June 2017
Resolved 29 August 2017
Resolution: Recieved email from Captain the replacement winch and davit name plates to be attached to affected lifesaving equipment. Cleared last 835.
Lifesaving › Lifeboat › Rudder/Tiller/Steering
Issued 16 May 2016 Resolved
The tiller’s on lifeboat #2 and lifeboat #3 are not able to be secured to the rudder stock because the release hook foundation obstructs the rudder stock. Emergency steering is not possible. Install tiller that facilitates emergency steering and, when not in use, is securely stowed near rudder stock. 46 CFR 109.301 (a) ; LSA Code 4.4.7.2
Condition: Design Flaw
Action required: 705 - Other - as specified
Due 23 May 2016
Resolved 23 May 2016
Resolution: Made new tiller extensions; demonstrated use. Manually steering now possible.
Communications › Alarms/Indicators › General Alarm
Issued 16 May 2016 Resolved
The GA/PA system is not loud enough to be clearly heard over machinery/ventilation on boat deck. Conduct sound survey to ensure GA/PA alarms and announcements can be heard/seen at muster stations, embarkation stations, accommodations, and normally accessible areas. If necessary, install new alarm signals/lights. Port side midships and at all liferaft stations need signal/beacon.46CFR113.50-50(b)..
Action required: 705 - Other - as specified
Due 15 June 2016
Resolved 21 December 2016
Resolution: Marine Inspecter walked main periphery weather deck with C/M to test audible GA, which was re-worked and additional speakers addded to make it louder. All SAT.
Documentation › Manuals/Policy Documentation › Emergency Instructions
Issued 16 May 2016 Resolved
Emergency Evacuation Plan. An EEP must be submitted by the holder of the lease. Approved EEP specific to vessel not available for review by [name withheld] for approval by OCMI, maintain EEP on board. 33 CFR 146.210
Condition: Improper/Lack of Maintenance
Action required: 705 - Other - as specified
Due 30 May 2016
Resolved 25 May 2016
Resolution: W&T Offshore delivered EEP aboard Q4K; reviewed by attending marine inspector.
Electrical › Electrical Distribution System (service) › Distribution Panel Bus
Issued 16 May 2016 Resolved
Each distribution panel must have a circuit directory that is accurate. Distribution panels on nav deck had improperly labeled blanks. Corrected on the spot.
Condition: Improper/Lack of Maintenance
Action required: 705 - Other - as specified
Due 16 May 2016
Resolved 16 May 2016
Resolution: Corrected OTS
Fire Fighting › Miscellaneous Items › Paint/Flammable Liquid Lockers
Issued 16 May 2016 Resolved
Each paint locker or cabinet must be made of steel or an equivalent material and latching. Flammable locker in Auxiliary Machinery Space (workshop) is missing latch. Replace/repair. 46 CFR 108.127
Condition: Improper/Lack of Maintenance
Action required: 705 - Other - as specified
Due 30 May 2016
Resolved 25 May 2016
Resolution: Showed repaired latch combustible liquid locker to attending marine surveyor. All sat.
Documentation › Safety/Response Plans/Programs › Waste Management Plan
Issued 16 May 2016 Resolved
Excessive oily rags/diapers in 5-gal buckets aft of MDG2 and in Auxiliary Machinery Space. Discharge oily rags IAW garbage/waste management plan and do not allow accumulation of excessive oily rags in workspaces and machinery spaces. 33 CFR 151.57(a) ; 33 CFR 142.4(b)
Condition: Improper/Lack of Maintenance
Action required: 705 - Other - as specified
Due 30 May 2016
Resolved 25 May 2016
Resolution: Attending marine inspector verified that oily rags were removed from machinery spaces and properly stowed in steel totes on deck and provisions made to prevent accummulation of oily rags on board.
Fire Fighting › Structural - A Class Divisions › Machinery Spaces
Issued 16 May 2016 Resolved
Machinery spaces shall have structural fire protection IAW SOLAS reg II-2 2.3.3 and class rules for DPS-3 notation. A-Class boundary doors are missing labels, ECR doors modified to void type rating, and E/R fire doors modified (latch) to void type rating. Foil tape used for A-60 repairs. Repair/replace/install SFP. Doors to be changed out during '17 drydock. 6 doors have modified latches;9 tags.
Condition: Improper/Lack of Maintenance
Action required: 17 - Rectify deficiencies prior to departure
Due 30 January 2017
Resolved 9 August 2017
Electrical › Electrical Distribution System (service) › Switch
Issued 16 May 2016 Resolved
During RPR test, ring bus experienced brown out, w/ single gen on line, not IAW FMEA/proving trials. Prove reliability of DP3 power management. 46 CFR 61.40-1 ; 46 CFR 61.40-6
Condition: Invalid
Action required: 15 - Rectify deficiencies by next port
Due 25 May 2016
Resolved 25 May 2016
Resolution: Attending marine inspectors had C/E conduct proving trial test #28, over/under voltage w/ 400kw deviation to segregate bus. Conducted test 6 times, 2 times each configuration. Conducted RPR IAW GE/Noble Denton procedures.

Casualty record · 16

18 December 2005Routine · role: Involved in a Marine Casualty · activity 2565314
9 July 2006Routine · role: Involved in a Marine Casualty · 1 injured · activity 2725860
27 July 2006Routine · role: Involved in a Marine Casualty · activity 2731399
6 October 2006Routine · role: Involved in a Marine Casualty · activity 2795354
13 May 2007Routine · role: Involved in a Marine Casualty · activity 2936292
20 June 2007Routine · role: Involved in a Marine Casualty · activity 2973616
3 October 2009Routine · role: Involved in a Marine Investigation (non-casualty) · activity 3610257
7 June 2010Routine · role: Involved in a Marine Investigation (non-casualty) · activity 3853820
30 June 2010Routine · role: Involved in a Marine Casualty · activity 3853847
15 January 2011Routine · role: Involved in a Marine Casualty · activity 3934991
1 October 2011Routine · role: Involved in a Marine Casualty · activity 4159876
15 November 2014Routine · role: Involved in a Marine Casualty · serious marine incident, as classified · activity 5025363
21 September 2017Routine · role: Involved in a Marine Casualty · activity 6277962
14 March 2018Routine · role: Involved in a Marine Casualty · serious marine incident, as classified · 1 injured · activity 6379986
17 July 2019Routine · role: Involved in a Marine Casualty · serious marine incident, as classified · 1 injured · activity 6759877
10 April 2022Routine · role: Involved in a Marine Casualty · activity 7430145
Each line is an incident investigation the Coast Guard recorded with this hull among the vessels involved, with the date and the classification the Coast Guard gave it. Involvement is not fault. The investigation narrative is not published. Source: IIR, through 2026.

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.