Underwater Hull Cleaning at Cotonou Port
Full hull cleaned in the water, vessel stays on hire
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Tell us the vessel, the port and the window. Scoped reply, usually the same working day.
Cleanship Marine provides underwater hull cleaning at Cotonou Port, Littoral, working the container and general cargo berths, RoRo berth. Commercial dive teams remove slime, weed and shell growth from the vertical sides, flat bottom, bilge keels, sea chests and niche areas with the vessel afloat and on hire — no dry dock, no diversion, no off-hire.
Cotonou is Benin's only deep-water port and the transit gateway for the landlocked Sahel, working containers, cotton, vehicles and agricultural bulk. Congestion is its defining operational feature and the reason so much tonnage sits here long enough to need a hull clean.
What it gets you
- Hydrodynamic smoothness restored before fouling reaches the calcareous stage that damages coating
- Fuel and emissions penalty from drag reduced without taking the vessel off hire
- Documented condition record for the technical file and the next docking specification
- Sea chests and inlets cleared, protecting cooling water flow
Working conditions at Cotonou
Cotonou is a breakwater harbour that handles a large share of the transit trade into Niger and Burkina Faso, which means congestion and long anchorage waits are routine rather than exceptional. That wait is the in-water opportunity. The Atlantic swell reaches the anchorage and the rains from May to October are heavy; the basin itself stays workable.
- Where we work
- Container and general cargo berths · RoRo berth · Outer anchorage
- Vessels we see here
- Feeder container ships · RoRo and vehicle carriers · Handysize bulk carriers · General cargo ships
What we do at Cotonou
- Pre-clean fouling survey to establish coverage, growth type and coating condition before any tool touches the hull
- Brush cart cleaning of the flat bottom and vertical sides, with brush hardness selected against your antifouling specification
- Hand cleaning of bilge keels, rudder, stern frame, thruster tunnels, anodes and the niches a cart cannot follow
- Sea chest gratings and inlet openings cleared of growth and debris to restore cooling water flow
- Diving permission cleared with Port Autonome de Cotonou and the terminal before mobilisation
- Before-and-after video and stills, with a written report on coating condition and anode wastage
Planning the window at Cotonou
The Atlantic swell and the rains governs the calendar at Cotonou Port, with the heaviest rain from May to October and swell running year-round. The swell here is long-period Atlantic ground swell rather than wind-driven sea, so it reaches the anchorages on days that look calm from the bridge and it is the single biggest cause of a lost in-water window on this coast. 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 container and general cargo berths, RoRo berth, outer anchorage, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via Cotonou (COO), 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 Cotonou
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 underwater hull cleaning attendance, wherever the vessel is. Anything outside it is quoted separately and flagged before mobilisation, never added afterwards.
- Fouling survey
- A pre-clean dive establishes fouling type, coverage and severity, and confirms coating condition so the correct tooling is selected.
- Flat bottom and vertical sides
- Brush cart cleaning of large areas, removing slime, weed and shell growth to restore surface smoothness.
- Niche areas
- Hand cleaning of bilge keels, bow thruster tunnels, rudder, stern frame, anodes and other niche areas where fouling concentrates.
- Sea chests and gratings
- Sea chest gratings and inlet openings cleared of growth and debris to restore cooling water flow.
- Documentation
- Underwater video and stills before and after, with a written report covering coating condition and anode wastage.
How we deliver it at Cotonou
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Cotonou. 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
Port Autonome de Cotonou 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 Cotonou
Divers, compressors, brush carts and cameras mobilise via Cotonou (COO). Where a vessel is also calling at Lomé, 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 underwater hull 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.
Cotonou Port at a glance
- UN/LOCODE
- BJCOO
- Port type
- State Port
- State
- Littoral
- Country
- Benin
- Water body
- Gulf of Guinea
- Port authority
- Port Autonome de Cotonou
- Main cargoes
- Containers, Cotton, Grain and agricultural bulk, General cargo, Vehicles and RoRo, Fuel
- Crew mobilisation
- Cotonou (COO)
- Services here
- Hull Cleaning and Hold Cleaning
Frequently asked — Underwater Hull Cleaning at Cotonou
Do you provide underwater hull cleaning at Cotonou Port?
Yes. Cleanship Marine works Cotonou Port (BJCOO) in Littoral, Benin, covering the container and general cargo berths, RoRo berth, outer anchorage. Teams mobilise via Cotonou (COO) with the full spread.
Can underwater hull cleaning be done while the vessel works cargo at Cotonou?
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 Cotonou and tell you honestly whether the window you have is enough.
Do you need a diving permit from Port Autonome de Cotonou?
Yes, and we obtain it. Diving permission from Port Autonome de Cotonou, 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 Cotonou?
Visibility at Cotonou Port is moderate, and it drops further around active bulk handling and after heavy rain, and the Atlantic swell and the rains 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 underwater hull cleaning on at Cotonou?
Feeder container ships, RoRo and vehicle carriers, Handysize bulk carriers, General cargo ships — the traffic at Cotonou Port runs to containers, cotton, grain and agricultural bulk, 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 Cotonou?
Divers and equipment mobilise via Cotonou (COO). 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 Lomé or Tema, one mobilisation is often sized to cover both.
What does underwater hull cleaning at Cotonou cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Cotonou. 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 Cotonou and you get a scoped price, usually the same working day.
Underwater Hull Cleaning at Cotonou Port.
Tell us the vessel, her ETA at Cotonou and the window. You get a scope, a crew size and an honest duration — usually the same working day.