Thruster Cleaning & Polishing at Mindelo Port
Full thrust restored when you need it most
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Tell us the vessel, the port and the window. Scoped reply, usually the same working day.
Cleanship Marine cleans and polishes bow and stern thrusters at Mindelo Port, São Vicente. Divers clear the full tunnel bore, polish the blades and hub, and clear the gratings, restoring the manoeuvring thrust that quietly disappears while a vessel sits idle.
Thruster tunnels are the worst fouling trap on a hull — sheltered, still and almost never inspected. Growth builds on the tunnel walls, blades and gratings without anyone noticing until manoeuvring performance drops, and at Mindelo — the mid-Atlantic bunkering stop inside a drowned volcanic crater — that tends to show at exactly the moment the thrust is needed.
Mindelo's cruise trade has grown fast, and the new cruise terminal opened in June 2025. Cruise ships lean on their bow thrusters for every berthing, often on a tight schedule with passengers waiting, and a thruster that has lost power to fouling shows up at exactly the wrong moment. The same goes for the ferries across to Santo Antão, which berth in the strong trade wind coming down the channel. A thruster clean in Mindelo is quick in the sheltered bay and is planned around the ship's time alongside.
What it gets you
- Manoeuvring thrust restored ahead of a berthing or a pilotage that needs it
- Tunnel and grating flow cleared, not just the visible blade faces
- Seal, boss and anode condition documented while the divers are already down
- Reduced reliance on tug assistance where thrust had quietly degraded
Working conditions at Mindelo
Porto Grande is a bay formed in an old, drowned volcanic crater, which is what makes it the deepest and best-sheltered natural harbour in the archipelago. Inside the bay the water is calm and — away from the working quays — clear. The exposure is in the approaches: the channel between São Vicente and Santo Antão funnels the north-east trade wind and can run a rough sea when the trades are strong, so launches and dive support are planned against the wind as well as the berth.
- Where we work
- Commercial quays of Porto Grande · Mindelo cruise terminal · Bunkering anchorage in the bay · Fishing port
- Vessels we see here
- Transatlantic vessels calling for bunkers · Cruise ships · Feeder container ships · Fishing vessels · Inter-island ferries
What we do at Mindelo
- Full tunnel bore cleaned end to end, both openings, including the areas behind the gratings
- Blade and hub polished, with seal and boss condition inspected and reported
- Tunnel gratings cleared of growth and debris so flow is restored, not just the visible face
- Anodes inside the tunnel checked and wastage recorded
- Diving permission cleared with ENAPOR – Portos de Cabo Verde, with the thruster confirmed isolated and tagged out before the dive
- Video record of tunnel and blade condition before and after
Planning the window at Mindelo
The trade-wind and swell season governs the calendar at Mindelo Port, with the strongest trade winds from roughly December to May, and a short rainy season from August to October. The islands sit in open ocean, so a port's exposure depends on which side of its island it faces: the lee-side harbours stay calm while the trade wind blows, but long-period swell from North Atlantic storms reaches the north and west coasts in winter, and the late-summer tropical waves that pass through here can turn into storms. Because the harbour is sheltered, work here normally runs alongside or at a protected anchorage and can proceed in parallel with cargo operations rather than competing with them for the berth window.
Work is taken at the commercial quays of Porto Grande, Mindelo cruise terminal, bunkering anchorage in the bay and fishing port, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via São Vicente (VXE), so give us the ETA as early as you have it — the travel is the flexible part, the approvals and the working window are not.
What we typically find at Mindelo
Liquid and gas tonnage here spends long stretches at the terminal or waiting for a slot, so growth tends to be even and well established across the hull rather than patchy — heavier than the trading pattern suggests, and further along than a speed report alone would indicate.
Shelter is a mixed blessing for a hull. The same calm that makes the port easy to work in is still water, and still water grows fouling faster than an exposed berth does.
Standard scope of work
Included as standard on every thruster cleaning attendance, wherever the vessel is. Anything outside it is quoted separately and flagged before mobilisation, never added afterwards.
- Tunnel cleaning
- Fouling removed from the full length of the tunnel bore, including the areas behind gratings where growth is heaviest.
- Blade cleaning and polishing
- Propeller blades and hub cleaned and polished to restore surface finish and reduce cavitation-inducing roughness.
- Grating and guard clearance
- Gratings and rope guards cleared of growth, netting and debris that restrict flow or risk fouling the unit.
- Condition inspection
- Blade edges, seals and visible gearcase condition inspected and recorded, with any damage reported immediately.
How we deliver it at Mindelo
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Mindelo. We come back with a defined scope, a crew size and a duration we will stand behind. Where the conditions here will not support what has been asked for, we say so at this stage rather than after mobilisation.
- 2
Permits and approvals
ENAPOR – Portos de Cabo Verde approves the work alongside the local harbour master, and at a state port that conversation is quicker but less formal — it is worth having in writing. Diving permission, terminal approval and any environmental clearance for in-water work are handled by us, not left with the agent to chase.
- 3
Mobilisation to Mindelo
Divers, compressors, brush carts and cameras mobilise via São Vicente (VXE). Where a vessel is also calling at Tarrafal, one mobilisation is normally sized to cover both.
- 4
Safety setup and the dive
The vessel is secured for diving — main engine, shaft and thrusters immobilised, sea suctions confirmed shut, permit agreed with the master. Teams work under surface supervision with continuous diver communications and video throughout.
- 5
Report and handover
A completion report covering thruster cleaning is issued with before-and-after imagery, coating and anode condition and anything found that you should know about. The findings are discussed with the vessel rather than emailed and forgotten.
Mindelo Port at a glance
- UN/LOCODE
- CVMIN
- Port type
- State Port
- Island
- São Vicente
- Country
- Cape Verde
- Water body
- Mindelo Bay (Porto Grande), Atlantic Ocean
- Port authority
- ENAPOR – Portos de Cabo Verde
- Main cargoes
- Containers, Fuel and bunkers, General cargo, Fishing catch
- Crew mobilisation
- São Vicente (VXE)
- Services here
- Hull Cleaning
Frequently asked — Thruster Cleaning at Mindelo
Do you provide thruster cleaning at Mindelo Port?
Yes. Cleanship Marine works Mindelo Port (CVMIN) in São Vicente, Cape Verde, covering the commercial quays of Porto Grande, Mindelo cruise terminal, bunkering anchorage in the bay and fishing port. Teams mobilise via São Vicente (VXE) with the full spread.
Can you clean a cruise ship's thrusters during a call at Mindelo?
Yes. The work is planned around the ship's time at the cruise terminal, with the thrusters isolated and tagged out with the bridge. The sheltered bay makes it a straightforward dive, and the thrusters are handed back before departure.
Can thruster cleaning be done while the vessel works cargo at Mindelo?
Yes, in most cases. The harbour is sheltered enough that divers work alongside while cargo operations continue, and neither holds the other up. The vessel stays on hire throughout, and there is no diversion and no dry dock. We scope against the conditions at Mindelo and tell you honestly whether the window you have is enough.
Do you need a diving permit from ENAPOR – Portos de Cabo Verde?
Yes, and we obtain it. Diving permission from ENAPOR – Portos de Cabo Verde, terminal approval where the berth requires it, and any environmental clearance for in-water work are arranged as part of the job rather than left with the agent. The master's permit to work and the immobilisation of machinery are agreed on board before anyone enters the water.
What is underwater visibility like at Mindelo?
Visibility at Mindelo Port is the best of any Cape Verdean harbour inside the sheltered crater bay, reduced only close to the busy commercial quays, and the trade-wind and swell season sets the outer limits of the calendar. How the tide and sea state shape the dive plan is set out in full in the working-conditions section on this page.
Which vessels do you carry out thruster cleaning on at Mindelo?
Transatlantic vessels calling for bunkers, Cruise ships, Feeder container ships, Fishing vessels and Inter-island ferries — the traffic at Mindelo Port runs to containers, fuel and bunkers, general cargo, so those are the profiles we see most. The scope is sized to the vessel, not to a standard package.
How quickly can a team mobilise to Mindelo?
Divers and equipment mobilise via São Vicente (VXE). Give us the ETA and the window and we will confirm what is achievable rather than promise a date we cannot hold. Where the vessel also calls at Tarrafal or Palmeira, one mobilisation is often sized to cover both.
What does thruster cleaning at Mindelo cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Mindelo. We would rather scope it properly and give you a specific figure than quote a headline rate that changes once the work starts. Send the details and the window at Mindelo and you get a scoped price, usually the same working day.
Thruster Cleaning & Polishing at Mindelo Port.
Tell us the vessel, her ETA at Mindelo and the window. You get a scope, a crew size and an honest duration — usually the same working day.