General Introduction to Ship Repair at Dung Quat Port

Dung Quat Port serves a large refinery and steel complex. That means two main ship types call here: tankers (for crude oil and products) and bulk carriers (for iron ore, coal, clinker, and steel raw materials). Work at this port must respect strict safety rules, tight cargo schedules, and heavy industrial traffic.

Vietnam Shiprepair Co. works as a mobile shipyard at Dung Quat. We can board your vessel at the jetty or at anchorage. We coordinate access with your agent/terminal, plan quickly with the Master and Chief Engineer, and deliver safe work that meets Class and site requirements. Our welders are IACS Class-approved (WPS/WPQ). Our procedures follow the practice used by ABS, LR, DNV, ClassNK, BV, RINA, and VR. We also provide NDT (UT/MPI/DPT), electrical tests (IR/PI/surge), pressure tests, load tests, and ultrasonic hatch tests with a signed report pack.

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What Makes Dung Quat Different

• Refinery rules: Hot work needs a gas-free certificate, LEL/O₂ checks, and strict permit to work. We are used to this routine.

• Steel complex traffic: Bulk cargo windows are tight. Repairs must protect your sailing time, not risk a missed slot.

• Mixed ship profiles: Tankers and bulkers need different skills. We keep two ready playbooks so we do not waste time on board.

• Protected bay: Many in-water jobs can be done safely when sea and visibility allow. If not, we set a temporary top-side fix and return later.

Our planning rule is simple: board fast, speak clearly, show test results, keep your schedule.

How We Plan and Execute Your Job

1. Inquiry & Boarding ETA — You send an RFQ with photos/log notes. We confirm an ETA to board after access is cleared.

2. On-board check — We inspect the defect, take measurements, and agree a safe work area around cargo operations.

3. Two options —

   • Option A (Recover Now): a safe, Class-acceptable fix to keep you sailing.

   • Option B (Full Overhaul): the complete job with OEM parts and extended tests when time and spares allow.

4. Execution milestones — Disassembly → parts ready → reassembly → test. You get short updates at each step.

5. Testing & acceptance — Functional trials; NDT, electrical, hydro, ultrasonic, load tests as needed.

6. Handover & warranty — Report pack (photos, readings, certificates), follow-up plan, and written warranty matched to scope.

Service Map for Dung Quat Port

A) Tanker-Focused Services

Why this matters: Safety rules are strict, and delays are costly. We design work steps that fit your CCR (Cargo Control Room) plan and terminal windows.

• Inert Gas System (IGS): blower overhauls, seal pot checks, deck water seal service, O₂ analyzer repair, alarm/test records.

• Cargo pumps and lines: electric/hydraulic cargo pumps inspection and repair; stripping pumps; pressure tests; leakage control at flanges and valves.

• P/V valves and gauging: service of P/V valves, deck pressure/vacuum lines, radar/ullage gauging sensors, overfill alarms.

• EX-proof equipment: inspection of flame paths, glands, and earthing/ bonding; replacement of damaged EX d/ e components with correct certification.

• Gas-free & hot work: we work only with valid gas-free certificates and live readings; no hot work without permits.

• Tank cleaning support: portable gear, slop handling coordination, manhole safety control (with terminal rules).

Result: Repairs that satisfy terminal checks and protect your schedule.

B) Bulker-Focused Services (steel and power cargoes)

Why this matters: Iron ore and coal are harsh on steel and hatch gear. Dust and abrasion increase wear and leaks.

• Hatch covers and coamings: packing renewal, cleat and wedge set-up, drain cleaning; ultrasonic tightness test to prove weather-tightness.

• Deck cranes and grabs: brake relining, seal kits, bearing renewal, wire rope checks; static/dynamic load tests using calibrated water bags.

• Catwalks, bulwarks, and deck plates: steel renewal and coating touch-ups; safe access maintained during cargo.

• Vent/air pipes: clearing blockages; new screens; noise/pressure drop improvements.

• Hold cleaning: high-pressure wash, dust and scale removal; odor treatment if needed.

Result: Tight hatches, reliable cranes, clean holds, and fewer claims.
> Details for On-deck Services

C) Electrical Power, Generators, and Motor Rewinding (our key strength)

Why this matters at Dung Quat: Dust and salt attack insulation and contacts. The first signs are hot spots, trips, and unstable voltage.

Motor rewinding (quấn lại động cơ điện):
We rewind motors for cargo cranes, mooring winches, windlass, hatch drives, pumps, and fans. Steps:

1. Open and check the core and nameplate.

2. Remove burnt/aged windings.

3. Rewind with the correct wire class and slot insulation.

4. Varnish impregnation + oven bake for strength and insulation.

5. New bearings, shaft polish, and coupling alignment.

6. Tests: IR, PI, surge test, and no-load run.
   Outcome: Lower temperature rise, correct torque, stable insulation. We hand over a test sheet.

Generators/alternators and AVR:
Clean stator/rotor, verify insulation class, change bearings, balance rotor if needed, service slip rings/brushes, and tune AVR. We check parallel load sharing and stop “voltage hunting.” No-load and load trials are done where safe.

Switchboards/MCCs:
Dust-safe cleaning; busbar de-oxidation; torque check on terminals; replace tired contactors/relays; improve ventilation. We renew and label cables; as-built drawings are updated.

Emergency power:
Fix EG auto-start issues; verify charger/rectifier output; battery load test; ATS function test.

D) Engine Room and Mechanical (clear priorities)

• Main and auxiliary engines: cylinder head overhaul; fuel pump/injector service; valve/tappet set; bearing checks; piston/liner inspection; alignment.

• Turbochargers: cleaning, clearance checks, and balancing if needed.

• Boiler and economizer: remove scale, patch leaks, tube renewal, refractory repair; safety valves set and tested.

• Pumps and compressors: ballast/bilge/FO/LO/SW pumps; seal/bearing work; compressor valve kits; set clearances.

• Automation: sensors and actuators; governor tuning; root-cause work on slowdowns/trips.

• HVAC and provision plant: find leaks, set expansion valve, service fans/belts, clean heat exchangers.

Plan: If time is short, we recover operation first and book the full overhaul when you have a gap.

>>> Details for Engine Room Services

E) Piping and Pressure Tests (SW/FO/LO/Ballast/GS)

• Sea-water lines: renew pitted spools with the right schedule and grade; add/repair supports where vibration exists.

• Hydro tests (renewed sections): usually 1.5× design pressure for ≥ 30 minutes, no leaks and no pressure drop beyond gauge accuracy.

• Valves: seat/back-seat tests per API 598; non-return function confirmed.

• Fuel and lube lines: flushing to maker’s cleanliness level; strainer ΔP in limits.

• Ballast: air pipe head checks; alarm function tests; hydro results recorded.

All test pressures, tools, and results are written in the report.

F) In-Water and Underwater Work

• UWILD (underwater inspection instead of drydock): photo/video of sea chests, overboard, bilge keels, rudder stock, anodes, CPP hubs (if fitted), and coating.

• Hull cleaning & propeller polishing: to lower fuel burn and improve speed.

• Temporary plugs: isolate sea chests/overboard to replace valves.

• Rope and net removal from propeller or shaft.

• Underwater thickness checks to plan your next drydock.

We always check sea state and visibility first. If not safe, we give a top-side temporary solution and return later.

>> Details for In-Water Services

G) Bridge, Navigation, and Radio

• Radar, ECDIS, echo sounder, AIS, VDR: repair, calibration, sensor and antenna work.

• Gyro & magnetic compass: adjust and compensate; provide certificate if needed.

• GMDSS & VHF: DSC tests; power supply checks; feeder/antenna renewal.

• ER alarms & monitoring: tank level sensors and switches, panel checks.
  >> Details for Bridge Services

Technical Acceptance CriteriaIf your maker or Class asks for stricter numbers, we use those and record them in the report.

Electrical / Rewinding

• IR (corrected to 40 °C): at least (1 MΩ per kV) + 1 MΩ.

• PI: ≥ 2.0 (we accept ≥ 1.5 only as a temporary result with a drying/rework plan).

• Surge test: phase waveforms within 10%; no breakdown.

• No-load current: within ±10% of acceptance data.

• Vibration (LV motors after overhaul): ≤ 4.5 mm/s RMS.

• Generator regulation: voltage ±1.5%, frequency ±0.5 Hz at rated load; THD < 5% on the bus.

• Parallel load sharing error: ≤ 10%; no hunting.

• Emergency generator: auto-start ≤ 45 s; ATS proven.

Deck / Hatches / Cranes

• Steel renewal: if thickness < Class minimum or loss > 25%.

• Hatch tightness: ultrasonic readings below maker/Class limits at cross-joints and sides.

• Cranes: static 110–125% SWL (as instructed); dynamic 100% SWL; brakes hold ≥ 125% SWL.

Piping / Hydro

• Hydro tests: 1.5× design pressure, ≥ 30 min, no leaks, no pressure drop beyond gauge resolution.

• Valve leakage: within API 598 class; soft-seated valves show zero leakage.

Engine / Boiler / Turbo

• Compression/peak pressure and exhaust temp spread within maker’s range after overhaul.

• LO pressure at rated load ≥ maker’s minimum; governor tuned (no overshoot/undershoot out of spec).

• Boiler/Economizer: hydro after tube work; safety valves set; stack temp/opacity acceptable.

Underwater

• Propeller: no nicks ≥ 2 mm; smooth finish; sea trial shows no imbalance.

• Coating: cleaning does not damage paint; anodes checked; photos/videos attached.

Image for Repair Propeller at Dung Quat Port, Vietnam.

Case Files (realistic, short, Dung Quat-specific)

Case 1 — Tanker cargo pump trips at berth
Symptom: Trip during start; hot smell from motor bay.
Action: Gas-free certificate checked; we cleaned EX bay, checked insulation (IR/PI), found low insulation from salt/dust. We dried and insulated for a safe temporary run, finished cargo at reduced rate, then did a full rewind ashore (varnish baked).
Result: Safe completion, stable motor after rewind, test sheet attached.

Case 2 — Bulker hatch leaks in heavy rain
Symptom: Water tracks near cross-joints.
Action: Renewed packings, set cleats and wedges, cleaned drains, and then did an ultrasonic tightness test.
Result: Readings within limits; no further leaks; certificate issued.

Case 3 — SW overboard valve badly corroded
Symptom: Weeping flange and thinning pipe wall.
Action: Fitted a temporary plug, replaced valve and spool, and did a hydro test.
Result: No leaks; thickness chart updated; photos in handover pack.

Safety and Clean Work

• Permits: hot-work permits, LOTO for electrical work, and gas tests for confined spaces.

• Refinery rules: we respect all terminal instructions; no hot work without gas-free and permits.

• Housekeeping: barriers, debris control, dust covers, and end-of-shift clean-downs.

• Waste/spills: handled under terminal rules, with records.

What You Receive After the Job

• Checklist of work done.

• Test sheets (IR/PI/surge, hydro, ultrasonic, load), plus photos/videos.

• Certificates (LSA/FFA annuals, crane load tests) when requested.

• Spares traceability (brand/model/SN).

• Updated as-built drawings/cable tags if changed.

• Written warranty matched to job type.

AQs (short answers for quick reading)

Can you work at the refinery jetty and at anchorage?
Yes. We do both, based on access and your time plan.

How fast can you rewind a motor?
It depends on size and condition. We often deliver a safe temporary run so you finish cargo, then complete the full rewind.

Do you provide certificates for load and hatch tests?
Yes. We provide proper reports and certificates.

Can you dive if the sea is rough?
We check sea state and visibility first. If unsafe, we apply a top-side temporary fix and return later.

Can you help with spares and customs?
Yes. We receive, document, and deliver spares to the vessel. If OEM parts are late, we propose an approved equivalent or a staged plan.

Contact Us Anytime (24/7/365)

Vietnam Shiprepair Co. – Dung Quat Port Service
Post Address: Tropic Garden, 66 Thao Dien, District 2, HCM City, Vietnam
Mobile/WhatsApp/WeChat: +84 869 677 769
Email: contact@vietnamshiprepair.net
Website: https://vietnamshiprepair.net

Call when your ship is alongside or at anchor. We will come on board, fix the problem safely, and keep your schedule.

VIDEO FOR SHIP REPAIR IN DUNG QUAT PORT, VIETNAM.