Thruster Cleaning & Polishing at Kolkata 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 Kolkata Port, West Bengal. 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 Kolkata, where the most demanding underwater working environment in India 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 Kolkata
Kolkata lies roughly 200 kilometres up the Hooghly, so vessels arrive draft-restricted and the tidal stream past the berths runs hard. Silt makes underwater visibility effectively zero, and every dive is planned to the slack around high water with the vessel secured and river traffic accounted for in the permit. Freshwater influence upriver also changes the fouling species compared with the coastal ports — the growth is often softer but covers more of the hull, which affects tooling selection more than owners expect.
- Where we work
- Kidderpore and Netaji Subhas dock berths · River moorings
- Vessels we see here
- Feeder container ships · General cargo ships · Coastal tonnage
What we do at Kolkata
- 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 Syama Prasad Mookerjee Port, Kolkata, 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 Kolkata
The north-east monsoon governs the calendar at Kolkata Port, roughly October to December. The Bay of Bengal also carries cyclone risk in April to June and again from October to December, so an anchorage attendance on this coast is planned with a standby allowance rather than a single fixed date. River current and sediment govern the method here: dives are cut to the slack either side of the tide, the team works by touch in near-zero visibility, and the vessel has to be properly secured against the stream before anyone enters the water.
Work is taken at the Kidderpore and Netaji Subhas dock berths, river moorings, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via Kolkata (CCU), 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 Kolkata
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 Kolkata than owners budget for.
River water changes what we find. Freshwater influence shifts the species mix and the growth is often softer but covers more of the hull, and sediment settles over the top of it on horizontal surfaces — two different problems on the same plate.
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 Kolkata
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Kolkata. 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 Syama Prasad Mookerjee Port, Kolkata, 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 Kolkata
Divers, compressors, brush carts and cameras mobilise via Kolkata (CCU). Where a vessel is also calling at Haldia, 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.
Kolkata Port at a glance
- UN/LOCODE
- INCCU
- Port type
- Major Port
- State
- West Bengal
- Country
- India
- Water body
- Hooghly River
- Port authority
- Syama Prasad Mookerjee Port, Kolkata
- Main cargoes
- Containers, General and project cargo, Fertiliser, Food grain, Coal
- Crew mobilisation
- Kolkata (CCU)
- Services here
- Hull Cleaning and Hold Cleaning
Frequently asked — Thruster Cleaning at Kolkata
Do you provide thruster cleaning at Kolkata Port?
Yes. Cleanship Marine works Kolkata Port (INCCU) in West Bengal, India, covering the Kidderpore and Netaji Subhas dock berths, river moorings. Teams mobilise via Kolkata (CCU) with the full spread.
Can thruster cleaning be done while the vessel works cargo at Kolkata?
Usually yes, but the constraint is the river rather than the cargo plan. Diving is held to the slack either side of the tide, so the real question is whether the vessel's stay covers enough slacks. The vessel stays on hire throughout, and there is no diversion and no dry dock. We scope against the conditions at Kolkata and tell you honestly whether the window you have is enough.
Do you need a diving permit from Syama Prasad Mookerjee Port, Kolkata?
Yes, and we obtain it. Diving permission from Syama Prasad Mookerjee Port, Kolkata, 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 Kolkata?
Visibility at Kolkata Port is effectively nil for most of the year, and the north-east 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 Kolkata?
Feeder container ships, General cargo ships and Coastal tonnage — the traffic at Kolkata Port runs to containers, general and project cargo, fertiliser, 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 Kolkata?
Divers and equipment mobilise via Kolkata (CCU). 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 Haldia or Dhamra, one mobilisation is often sized to cover both.
What does thruster cleaning at Kolkata cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Kolkata. 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 Kolkata and you get a scoped price, usually the same working day.
Thruster Cleaning & Polishing at Kolkata Port.
Tell us the vessel, her ETA at Kolkata and the window. You get a scope, a crew size and an honest duration — usually the same working day.