Ship cleaning is one of those services that sounds simple until the vessel is alongside and the surveyor is waiting. The tank either passes or it does not. The hold either meets the next cargo standard or the vessel stays. The cleaning team either understands the sequence or the schedule starts to move.
In Dubai, the demand is constant. Tankers change cargo, bulk carriers prepare for grain, offshore vessels return from a charter, and tugs and barges accumulate the kind of oily residue that only shows up during an inspection. The cleaning scope is different in each case, and so is the amount of time it takes.
This guide separates the main cleaning scopes, explains the compliance points that matter, and shows what to confirm before a team mobilises.
Start with the next cargo, not the last one
The most common mistake in a cleaning enquiry is describing the previous cargo and leaving out the next one. Cleaning is a preparation step. The standard is set by what the tank or hold will carry next, or by the survey or inspection that follows.
A tank that is acceptable for a dark petroleum product may fail a wall-wash requirement for a sensitive grade. A hold that is visually clean may still fail a grain inspection because of loose rust scale, odour or a damp bilge well. The cleaning method, chemical selection and inspection criteria all follow from the destination requirement.
Send the previous cargo, the next cargo or inspection standard, the tank or hold numbers, and any charterer or surveyor specification with the enquiry.
Cargo tank cleaning
Cargo tank cleaning on tankers typically runs through pre-wash, main washing, chemical treatment where required, mucking, drying and gas freeing. The sequence depends on the cargo history and the next grade.
Key variables include:
- Coating type — epoxy, zinc silicate, stainless steel and coated tanks each have different limits for temperature, chemicals and manual work.
- Residue behaviour — waxy, heavy or solidified residues may need heating or steam before washing.
- Cleaning standard — visual, wall-wash, water-white or a specific hydrocarbon and permanganate requirement.
- Ventilation and gas freeing — entry and inspection cannot proceed until the atmosphere is safe.
- Slop handling — washings must be collected and disposed of through an approved route with documentation.
Chemical tanker cleaning adds another layer. The previous cargo's MARPOL Annex II category and the receiver's specification shape the sequence. In many cases, planning the cargo sequence is more effective than increasing chemical dosage.
Cargo hold cleaning
Bulk carrier holds are usually prepared for the next cargo or for an independent survey. Common standards include grain-clean, food-grade and general clean.
A practical hold cleaning scope covers:
- Sweeping and removal of residual cargo
- Fresh or sea water washing
- Chemical treatment for stains and odour
- Removal of loose rust scale
- Cleaning of bilge wells, strainers and bilge lines
- Drying and ventilation
- Hatch cover, coaming and seal preparation
The failure points are predictable: bilge wells, hatch cover seals, under-frame areas and any place where residue can sit out of sight. A good team inspects those areas before the surveyor does.
Ballast, fuel and bilge tank cleaning
Ballast tank cleaning removes sediment, supports coating inspection and prepares the tank for repair or survey. It is often combined with anode inspection and steel condition checks.
Fuel and lube oil tank cleaning is confined-space work. Sludge removal, gas freeing, atmosphere testing and permit-to-work controls are essential. This is not a task to assign casually to a crew already stretched by a port call.
Bilge and engine room cleaning covers tank tops, oily water separator areas, sounding pipes and machinery spaces. Beyond fire safety and inspection readiness, a clean engine room shapes the impression a port state control officer forms during an inspection.
Compliance and documentation
Cleaning work in UAE waters sits within a framework that includes MARPOL requirements for oily residues and noxious liquid substances, port and terminal rules, confined space entry procedures, and class or flag requirements where the work supports a survey.
Ask any provider to explain:
- How washings and slops will be collected and disposed of
- What permits and gas tests are required
- How tank entry is controlled
- What records the vessel will receive
- Who liaises with the terminal or surveyor
A cheap quote that excludes slop disposal is not a cheap quote. It is an incomplete one.
How long does ship cleaning take?
There is no single answer, but the main drivers are consistent:
| Scope | Typical duration | Main variables |
|---|---|---|
| Cargo tank, like-for-like wash | 12–24 hours | Tank size, residue, coating |
| Multi-tank chemical clean | 1–5 days | Cargo sequence, standard, survey |
| Cargo hold cleaning | 1–3 days | Previous cargo, next standard, access |
| Ballast tank cleaning | 2–5 days | Sediment, coating, inspection scope |
| Fuel or lube oil tank | 1–4 days | Sludge volume, gas freeing, entry |
| Bilge and engine room | 1–2 days | Area, grease, access |
These are planning ranges, not quotations. A vessel with heated cargo, limited access or a tight survey window will move outside them.
What drives the cost
Cleaning is usually quoted per job. The price moves with:
- Number and size of tanks or holds
- Previous and next cargo
- Cleaning standard and inspection requirement
- Location: alongside, anchorage or drydock
- Chemicals, fresh water and heating
- Slop volume and disposal
- Manning and shift pattern
- Additional work found during cleaning
Ask for the quote to separate labour, chemicals, water, waste disposal and mobilisation. That makes comparison possible.
How to choose a cleaning provider in Dubai
Look for:
- Relevant experience with your vessel type and cargo sequence
- A clear method statement and safety plan
- Confined space and permit-to-work procedures
- Approved waste reception arrangements
- Equipment and manpower that can sustain the schedule
- A single coordinator who reports progress
- Availability across the ports you actually call at
The best provider is not the one with the longest service list. It is the one that can explain how your specific tank or hold will be cleaned, inspected and documented.
RNS Shipping cleaning support
RNS Shipping provides tank cleaning and technical servicing for vessels in Dubai, Jebel Ali, Dubai Maritime City and Khorfakkan. The operations team reviews the previous cargo, next requirement, tank or hold details, vessel location and working window before proposing a scope.
For combined requirements, cleaning can be coordinated with technical repairs, spare parts and chandelling through one operations desk.
Questions ship managers ask
What is included in ship cleaning services in Dubai?
A typical scope can include cargo tank cleaning, cargo hold cleaning, ballast and fuel tank cleaning, bilge and engine room cleaning, and deck or machinery space cleaning. The exact scope depends on the vessel type and the next cargo or inspection.
How long does ship tank cleaning take?
A simple like-for-like wash on a small tanker can take around 12 hours. A multi-tank clean to a wall-wash standard after a heavy cargo can take several days. Access, residue, heating, coating type and surveyor requirements all affect the schedule.
Do you handle slop and waste disposal?
Cleaning slops must go to an approved reception facility with the correct documentation. Confirm that collection, transfer and receipts are included in the provider's scope so the vessel's records are complete.
Can cleaning be done while cargo operations continue?
Some deck and machinery cleaning can run in parallel with cargo work, subject to terminal approval and a joint risk assessment. Tank entry and hold cleaning usually require the area to be isolated and gas-tested first.
Which Dubai locations can be covered?
RNS Shipping supports vessels in Dubai, Jebel Ali, Dubai Maritime City and Khorfakkan, with wider UAE mobilisation discussed through the operations desk.
