Thruster Cleaning & Polishing at Praia 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 Praia Port, Santiago. 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 Praia — the capital's harbour and hub of the inter-island ferries — that tends to show at exactly the moment the thrust is needed.
Ferries berth at Praia several times a week and they berth on their thrusters, often with the trade wind pushing them off or onto the quay. A tunnel that has fouled quietly over weeks of short trips costs exactly the thrust that makes those berthings safe. Because the ferries are in and out of Praia so often, a thruster clean here fits easily into a normal port stay — the thruster is isolated with the master, cleaned, and handed back before the next departure.
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 Praia
Praia sits in a natural bay between Ponta Temerosa and Ponta das Bicudas, with the Ilhéu de Santa Maria to the west, and the quays are sheltered from the north-east trade wind that governs the rest of the archipelago. The water is ocean water rather than river or lagoon water, so visibility is good by the standards of the African coast, though it drops close to the quays with propeller wash and harbour traffic. The berths are busy with ferries and feeders, so in-water work is either sequenced around the ferry timetable or taken at the anchorage in the bay.
- Where we work
- Main commercial quays · Ferry berths · Fishing quay · Anchorage in Praia bay
- Vessels we see here
- Feeder container ships · Inter-island ferries · General cargo coasters · Cruise ships · Fishing vessels
What we do at Praia
- 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 Praia
The trade-wind and swell season governs the calendar at Praia 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 main commercial quays, ferry berths, fishing quay and anchorage in Praia bay, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via Praia (RAI), 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 Praia
Container tonnage on a fixed rotation shows the familiar pattern: light slime over most of the vertical sides, with the real accumulation in the flat bottom, the bilge keels and the niches where flow is slowest. Those are the areas that cost fuel and the ones a quick clean tends to skip.
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 Praia
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Praia. 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 Praia
Divers, compressors, brush carts and cameras mobilise via Praia (RAI). Where a vessel is also calling at Vale dos Cavaleiros, 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.
Praia Port at a glance
- UN/LOCODE
- CVRAI
- Port type
- State Port
- Island
- Santiago
- Country
- Cape Verde
- Water body
- Atlantic Ocean
- Port authority
- ENAPOR – Portos de Cabo Verde
- Main cargoes
- Containers, General cargo, Construction materials, Fishing catch
- Crew mobilisation
- Praia (RAI)
- Services here
- Hull Cleaning
Frequently asked — Thruster Cleaning at Praia
Do you provide thruster cleaning at Praia Port?
Yes. Cleanship Marine works Praia Port (CVRAI) in Santiago, Cape Verde, covering the main commercial quays, ferry berths, fishing quay and anchorage in Praia bay. Teams mobilise via Praia (RAI) with the full spread.
Can you clean a ferry's bow thruster during a normal port stay in Praia?
Yes. The thruster is isolated and tagged out with the master, the divers clean the tunnel, blades and gratings, and it is returned to service before the next sailing. For most ferries the job fits into an ordinary overnight stay.
Can thruster cleaning be done while the vessel works cargo at Praia?
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 Praia 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 Praia?
Visibility at Praia Port is good — this is ocean water with no river runoff — though it drops for a while near the quays after ferry and feeder movements stir up the bottom, 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 Praia?
Feeder container ships, Inter-island ferries, General cargo coasters, Cruise ships and Fishing vessels — the traffic at Praia Port runs to containers, general cargo and construction materials, 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 Praia?
Divers and equipment mobilise via Praia (RAI). 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 Vale dos Cavaleiros or Furna, one mobilisation is often sized to cover both.
What does thruster cleaning at Praia cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Praia. 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 Praia and you get a scoped price, usually the same working day.
Thruster Cleaning & Polishing at Praia Port.
Tell us the vessel, her ETA at Praia and the window. You get a scope, a crew size and an honest duration — usually the same working day.