Praia Port · CVRAI

Propeller Polishing at Praia Port

Mirror finish, measurably lower fuel burn

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Tell us the vessel, the port and the window. Scoped reply, usually the same working day.

Cleanship Marine carries out underwater propeller super polishing at Praia Port, Santiago. Divers work the blades through a multi-stage sequence to a Class A mirror finish, removing fouling, calcareous deposits and accumulated surface roughness while the vessel lies alongside or at anchor.

The propeller is the highest-leverage surface on any vessel calling at Praia: it runs at high relative velocity, so roughness there costs disproportionately more than the same roughness spread over the hull. For the feeder container ships, inter-island ferries and general cargo coasters working this port, polishing is the shortest route to a measurable fuel saving.

The ferries out of Praia make hard crossings — the run to Fogo and Brava in particular is exposed to the trade wind sea, and crossing times stretch by hours in rough weather. On a vessel that burns fuel against a head sea several times a week, propeller roughness is paid for on every trip, and polishing is the cheapest efficiency gain available between dockings. For the feeders calling Praia on a liner rotation, the polish is best timed to the anchorage wait before the berth, so it costs no berth time at all.

What it gets you

Blade roughness removed where it costs the most, at the highest-velocity surface on the vessel
Propeller efficiency restored between dockings without off-hire
Cavitation erosion and edge damage documented before it becomes a repair item
A finish record that supports hull and propeller performance monitoring

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

Blade condition assessment covering both faces, the leading and trailing edges and the tips
Multi-stage polishing sequence worked down to a Class A mirror finish
Boss, hub and fairing cone cleaned, with rope guard and seal area inspected
Edge damage, cavitation erosion and any deformation photographed and reported rather than polished over
Diving permission cleared with ENAPOR – Portos de Cabo Verde, and the shaft confirmed immobilised with the master before the dive
Before-and-after video and a written finish record for the performance file

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 propeller polishing attendance, wherever the vessel is. Anything outside it is quoted separately and flagged before mobilisation, never added afterwards.

Deposit removal: Calcareous growth, shell and hard deposits removed from both blade faces without gouging or scoring the blade surface.
Progressive polishing: Successive abrasive grades work the blade from rough to fine, finishing at a Class A mirror surface across the full blade area.
Edge finishing: Leading and trailing edges dressed to restore profile and remove the roughness that seeds cavitation.
Boss and hub: Boss, hub and rope guard cleaned, with stern tube seal condition inspected and reported.

Full Propeller Polishing service details

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 propeller polishing 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 — Propeller Polishing at Praia

Do you provide propeller polishing 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.

How often should a Cape Verde inter-island ferry have the propeller polished?

More often than a deep-sea ship, because ferries run short, hard, frequent crossings. We set the interval from the vessel's fuel and performance data rather than a fixed calendar; for most ferries working out of Praia, a check at each hull clean and a polish whenever roughness has returned is the practical rhythm.

Can propeller polishing 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 propeller polishing 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 propeller polishing 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.

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