Thruster Cleaning & Polishing at Pepel 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 Pepel Port, Port Loko. 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 Pepel — iron ore loading on the Sierra Leone River — that tends to show at exactly the moment the thrust is needed.
The tugs and barges that work the Sierra Leone River and the ore berth spend their lives in warm, silty water and manoeuvre against the tidal stream. Fouled thruster tunnels and tug propulsion lose exactly the power that work needs. We clean them between ship movements, with the units isolated.
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 Pepel
Pepel is about 24 kilometres up the Sierra Leone River from Freetown, at the end of the 84-kilometre railway from the Marampa iron ore mine. The river is tidal and carries silt, so visibility is low and dives are timed to the tide, and the anchorage depth of around 9 to 10 metres limits the draft of ships that can work here. The rainy season from about May to October adds heavy run-off.
- Where we work
- Ore loading berth · Pepel anchorage
- Vessels we see here
- Handysize to Panamax bulk carriers · Barges and tugs
What we do at Pepel
- 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 Sierra Leone Ports Authority and the mine operator, 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 Pepel
The combination of Atlantic swell and rain governs the calendar at Pepel 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. The tidal stream and the silt load govern the method here: the working window is slack water, not the working day, and the operation is planned by feel and surface supervision with video kept as the record rather than as the diver's means of navigation.
Work is taken at the ore loading berth and Pepel anchorage, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via Freetown Lungi (FNA), 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 Pepel
Dry bulk handling here puts cargo dust into the water around the berths and anchorage. It settles on horizontal surfaces and packs into sea chest gratings and inlet openings, so inlet and grating clearance is routinely a larger part of the job at Pepel than owners budget for.
Bulk carriers at Pepel often wait at anchor for a loading slot in warm, silty river water. Growth builds on the flat bottom during the wait, and the sea chests take in silt as well as marine growth.
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 Pepel
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Pepel. 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
Access at Pepel Port is the terminal operator's decision as much as Sierra Leone Ports Authority and the mine operator's, so both are in the approval chain from the start — a berth-side refusal discovered at the gangway costs the whole attendance. 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 Pepel
Divers, compressors, brush carts and cameras mobilise via Freetown Lungi (FNA). Where a vessel is also calling at Freetown, 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.
Pepel Port at a glance
- UN/LOCODE
- SLPEP
- Port type
- Private Port
- State
- Port Loko
- Country
- Sierra Leone
- Water body
- Sierra Leone River estuary
- Port authority
- Sierra Leone Ports Authority and the mine operator
- Main cargoes
- Iron ore
- Crew mobilisation
- Freetown Lungi (FNA)
- Services here
- Hull Cleaning and Hold Cleaning
Frequently asked — Thruster Cleaning at Pepel
Do you provide thruster cleaning at Pepel Port?
Yes. Cleanship Marine works Pepel Port (SLPEP) in Port Loko, Sierra Leone, covering the ore loading berth and Pepel anchorage. Teams mobilise via Freetown Lungi (FNA) with the full spread.
Do you clean tug and workboat thrusters at Pepel?
Yes, between ship movements, with the thruster isolated first. Silt and warm water foul them quickly.
Can thruster cleaning be done while the vessel works cargo at Pepel?
During the wait at the Pepel anchorage, at slack water. Divers do not work alongside the ore berth during loading. The vessel stays on hire throughout, and there is no diversion and no dry dock. We scope against the conditions at Pepel and tell you honestly whether the window you have is enough.
Do you need a diving permit from Sierra Leone Ports Authority and the mine operator?
Yes, and we obtain it. Diving permission from Sierra Leone Ports Authority and the mine operator, 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 Pepel?
Visibility at Pepel Port is low — the Sierra Leone River is tidal and silty, and worst in the rainy season, and the combination of Atlantic swell and rain 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 Pepel?
Handysize to Panamax bulk carriers, Barges and tugs — the traffic at Pepel Port runs to iron ore, 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 Pepel?
Divers and equipment mobilise via Freetown Lungi (FNA). 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 Freetown or Conakry, one mobilisation is often sized to cover both.
What does thruster cleaning at Pepel cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Pepel. 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 Pepel and you get a scoped price, usually the same working day.
Thruster Cleaning & Polishing at Pepel Port.
Tell us the vessel, her ETA at Pepel and the window. You get a scope, a crew size and an honest duration — usually the same working day.