Thruster Cleaning & Polishing at Dahanu 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 Dahanu Port, Maharashtra. 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. That matters more than usual at Dahanu, where long idle discharge cycles at an open coal anchorage keeps vessels stationary in warm water for extended periods and growth builds on tunnel walls, blades and gratings until manoeuvring performance is noticeably down at exactly the moment it is needed.
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 Dahanu
Dahanu works as an open anchorage on the Palghar coast north of Mumbai, so every dive is done with the vessel at anchor and no shelter from swell. The south-west monsoon effectively closes the season between June and September. Coal dust from barge transfer settles down through the water column around the working area, so visibility drops sharply near an active discharge and the dive plan puts the team clear of the transfer side of the hull wherever the anchorage and the wind allow.
- Where we work
- Outer anchorage · Lighterage transfer position
- Vessels we see here
- Handysize and Supramax bulk carriers · Lighterage barges and tugs
What we do at Dahanu
- 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 Maharashtra Maritime Board, 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 Dahanu
The south-west monsoon governs the calendar at Dahanu Port, roughly June to September. Swell and reduced surface visibility close most open-water work on this coast for the duration, and the weeks either side are unreliable rather than unusable. Work here is done with the vessel riding to her anchor, so the dive plan is built around sea state and swell rather than a berth slot, and the team stands by for a workable window rather than a scheduled one.
Work is taken at the outer anchorage and lighterage transfer position, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via Mumbai (BOM), 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 Dahanu
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 Dahanu than owners budget for.
Vessels here sit at anchor for long periods, and a stationary hull in warm water is the ideal fouling substrate. The heaviest growth we lift at this port is almost always off a vessel that has been waiting rather than working.
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 Dahanu
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Dahanu. 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
Diving permission is obtained from Maharashtra Maritime Board, along with terminal approval where the berth requires it and any environmental clearance for in-water work. This is handled by us, not left with the agent to chase.
- 3
Mobilisation to Dahanu
Divers, compressors, brush carts and cameras mobilise via Mumbai (BOM). Where a vessel is also calling at Mumbai, 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.
Dahanu Port at a glance
- UN/LOCODE
- INDHU
- Port type
- State Port
- State
- Maharashtra
- Country
- India
- Water body
- Arabian Sea
- Port authority
- Maharashtra Maritime Board
- Main cargoes
- Thermal coal, General bulk
- Crew mobilisation
- Mumbai (BOM)
- Services here
- Hull Cleaning and Hold Cleaning
Frequently asked — Thruster Cleaning at Dahanu
Do you provide thruster cleaning at Dahanu Port?
Yes. Cleanship Marine works Dahanu Port (INDHU) in Maharashtra, India, covering the outer anchorage and lighterage transfer position. Teams mobilise via Mumbai (BOM) with the full spread.
Can thruster cleaning be done while the vessel works cargo at Dahanu?
Yes — it is the norm here, because the work is done at anchor rather than at a berth. Barge operations carry on around the dive, with the working side agreed with the master beforehand. The vessel stays on hire throughout, and there is no diversion and no dry dock. We scope against the conditions at Dahanu and tell you honestly whether the window you have is enough.
Do you need a diving permit from Maharashtra Maritime Board?
Yes, and we obtain it. Diving permission from Maharashtra Maritime Board, 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 Dahanu?
Visibility at Dahanu Port is generally workable outside the monsoon, though cargo dust from lighterage reduces it sharply near an active transfer, and the south-west monsoon 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 Dahanu?
Handysize and Supramax bulk carriers, Lighterage barges and tugs — the traffic at Dahanu Port runs to thermal coal and general 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 Dahanu?
Divers and equipment mobilise via Mumbai (BOM). 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 Mumbai or Nhava Sheva, one mobilisation is often sized to cover both.
What does thruster cleaning at Dahanu cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Dahanu. 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 Dahanu and you get a scoped price, usually the same working day.
Thruster Cleaning & Polishing at Dahanu Port.
Tell us the vessel, her ETA at Dahanu and the window. You get a scope, a crew size and an honest duration — usually the same working day.