ship handling

Home page|| Tanker Notes || Container Ship Operations || Ocean Navigation ||



Burning of diesel and heavy fuel oil -Disposal and handling of sludge

It is internationally recognized that the burning of Diesel and Heavy Fuel Oil can result in many environmental impacts. When fuel is combusted, pollutants such as the Oxides of Carbon, Nitrogen and Sulfur are emitted to the atmosphere. These can contribute to the effects of Greenhouse gases and acid rain.


Mitigating environmental impacts following to be ensure:
  1. The main and auxiliary engines are operated according to manufacturers instructions


  2. The main and auxiliary engines are properly maintained as per the manufacturers instructions and the vessels planned maintenance system


  3. Funnel exhaust is correctly monitored to ensure efficient combustion


  4. Speed is correctly adjusted to avoid excess fuel consumption whilst staying within the parameters of the charterers requirements


  5. Speed is reduced in heavy weather to avoid unproductive consumption apart from the safety aspect


  6. The automatic pilot is correctly set to avoid frequent and excessive helm movements


  7. The condition of the ships bottom is regularly inspected for signs of fouling or damage to coating


  8. The condition of the ships propeller is regularly inspected for signs of damage


  9. Ancillary systems, including lighting, ventilation systems, galley ranges, steam supplies etc are turned off when not required




Disposal and handling of sludge

Residual wastes, such as sludge containing oil or petroleum wastes from the engine room must be disposed of in a safe and responsible manner and in full compliance with MARPOL regulations. Slop or sludge tanks on the vessel are to be used for the preliminary storage of such waste. Disposal will be either directly to shore facilities or by the use of onboard incinerators or by other acceptable means as stated in the supplement to the IOPP Certificate “Form A/B”.

If not stated in the IOPP Supplement Form A/B and the vessel has insufficient approved free capacity onboard to reach shore reception facilities, the transfer of engine-room sludge to the cargo system slop tanks may only be carried out after contact with the management office has been made and flag authorisation for the transfer provided.

A Risk Assessment and Critical Operations Checklist must be created by the vessel and reviewed by the management office prior to the commencement of any such transfer.

Sludge is to be considered as “contaminated, hazardous and toxic” and therefore must be handled with care by competent staff using appropriate equipment and protective clothing. Sludge may contain a mixture of a variety of contaminants, including rust, sand, dust, refinery catalytic fines, asphaltenes, acids, alkalis, various elements such as aluminium, silicon, vanadium, sodium etc. There is also the possibility that fats, toxic leaded compounds, bacterial and fungal micro-organisms may be present.

The above may result in a hazardous and/or toxic situation with the presence of harmful gases or vapours. Thus there is a significant danger of explosion and fire as well as the dangers associated with toxic chemicals. In addition the presence of infectious substances, asbestos, radioactive and corrosive substances may also be possible.

When cleaning tanks, personnel must be made aware of and follow the correct safety measures. These include the wearing of full protective clothing and respiratory equipment. The avoidance of the inhalation of fumes and contact with skin when handling sludge is of the highest importance. The heating of sludge tanks may also increase the risk to personnel. Accordingly a risk assessment is to be undertaken before any operation involving the transfer or handling sludge is carried out.



Read more on

Pollution by oil [Marpol Annex I ]

What is toxic releases onboard and associated hazards? ....

How to report in case of an oil spillage onboard

Oil disaster prevention

Handling guideline for oil cargo

Oil pollution prevention method




Related articles

Oil spillage prevention procedure

Pollution by other harmful substances & harmful packaged goods

Pollution by garbage [ Marpol annex V ]

Pollution by sewage [ Marpol annex IV ]

Pollution of air [ Marpol annex VI ]

Prohibition on use of harmful (TBT) anti-fouling paints

Pollution by ballast water

Prevention of pollution while carryiung out overboard maintenance

Environment friendly purchasing

Decommissioning / ship recycling

Environmental awareness






Other info pages !

Ships Charterparties Related terms & guideline
Stevedores injury How to prevent injury onboard
Environmental issues How to prevent marine pollution
Cargo & Ballast Handling Safety Guideline
Reefer cargo handling Troubleshoot and countermeasures
DG cargo handling Procedures & Guidelines
Safety in engine room Standard procedures
Questions from user and feedback Read our knowledgebase
Home page




ShipsBusiness.com is merely an informational site about various aspects of ships operation,maintenance procedure, prevention of pollution and many safety guideline. The procedures explained here are only indicative, not exhaustive in nature and one must always be guided by practices of good seamanship.

User feedback is important to update our database. For any comment or suggestions please Contact us
Site Use and Privacy - Read our privacy policy and site use information.
//Home //Terms and conditions of use

Copyright © 2015 www.shipsbusiness.com All rights reserved.