Hold cleaning after discharging Cement
- To avoid cargo residues sticking inside the Holds after cleaned, a thorough cleaning is extremely necessary, more residues removed during dry cleaning, the easier will be chemical washing.
- Air blowing is the most effective means of dry cleaning, if the local regulation permits.
- If the air blowing is not allowed, sweeping can be carried out which will time consuming & less effective.
- After dry cleaning, the holds are to be chemically washed with Muriatic Acid/Hydrochloric Acid using designated cleaning kit.
- The Chemicals must be applied starting at the hatch coaming and must be on the surface for 15-30 minutes to allow maximum efficiency but not to dry out.
- When working with chemical all personnel involved must wear full “Personal Protective Equipment”.
- After Chemical washing the holds are to washed with Sea Water and rinsed with Fresh Water (depending on the next cargo).
- The Chief Officer should avoid vessels normal bilge pumping for empting holds during cleaning cement residue. A submersible pump should be used to avoid clogging of permanent bilge piping system.
After discharging Cement Clinker, the cleaning procedure will depend on the next Cargo. If the loading “Grain” then the tank tops/upper & lower hopper spaces must be thoroughly swept before washing with chemical, washed with sea water and finally rinsed with Fresh Water.
Regulations for Disposal of Cargo Residues
- While disposing Cargo residues and Wash down water, the Chief should ensure that MARPOL 73/78 are strictly followed
- MARPOL 73/78 Annex V requires that all ships of 400 GT and above have an approved Garbage Management Plan and a Garbage record book.
- Cargo residues, wash water and wash water containing chemicals which are Harmful to the Marine Environment (HME) must be identified as such and disposed of in the correct manner. From 1 January 2013,
- New requirements under MARPOL annex V have come into force, which specifically apply to the disposal of cargo residues and wash water in to the marine environment. All persons involved in the cargo chain must familiarise themselves with these requirements. They basically state that:
- No discharge of cargo residues should occur less than 12 nautical miles from the nearest land, or the nearest ice shelf.
- No discharge of cargo residues should occur within the MARPOL defined ‘Special Areas’.
- No discharge of any cargo residues specified as HME.
- Hold wash water should be discharged to a suitable reception facility (RF).
- Any cargo residues and wash-down water disposals or discharges should be recorded as Garbage Category 4 in the Garbage Record Book, and the entries should include start and stop positions.
Washings containing hold cleaning Chemicals
- These chemicals could be in themselves be pollutants. If the substance falls within Annex 1 (Oil) or Annex II (Noxious Liquid Substances), then then the washing will have to be disposed to the Annex requirements.