Underwater Hull Cleaning at Kolkata 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 Kolkata Port, West Bengal, working the Kidderpore and Netaji Subhas dock berths, river moorings. 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.
Kolkata is India's oldest operating major port and the only true riverine one, serving eastern India and the landlocked neighbours through feeder and general cargo tonnage. Between the draft restriction, the current and the visibility, it is the most technically demanding underwater working environment on this coast.
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 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
- 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 Syama Prasad Mookerjee Port, Kolkata 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 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 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 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 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.
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 — Underwater Hull Cleaning at Kolkata
Do you provide underwater hull 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 underwater hull 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 underwater hull 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 underwater hull 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.
Underwater Hull Cleaning 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.