4 Outline of IBTS
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Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC.1/Circular.642 – 2008 Revised Guidelines for Systems for Handling Oily Wastes in Machinery Spaces of Ships Incorporating Guidance Notes for an Integrated Bilge Water Treatment System (IBTS)... - Annex - 2008 Revised Guidelines for Systems for Handling Oily Wastes in Machinery Spaces of Ships Incorporating Guidance Notes for an Integrated Bilge Water Treatment System (IBTS) - Appendix 1 – Guidance Notes for an Integrated Bilge Water Treatment System (IBTS) - 4 Outline of IBTS

4 Outline of IBTS

Parent topic: Appendix 1 – Guidance Notes for an Integrated Bilge Water Treatment System (IBTS)

4.1 Collection of drains

  4.1.1 Oily drains are collected through the fixed drainage arrangements to oil residue (sludge) tanks.

  4.1.2 Clean drains are collected through the fixed drainage arrangements to clean drain tanks.

  4.1.3 Oily drains and clean drains should be collected separately so as not to contaminate clean drains with oil.

4.2 Pre-treatment of oily bilge water

 To avoid feeding excessive oil to oil filtering equipment, oily bilge water in the bilge wells is transferred to the bilge primary tank for pre-separation of oil. The high oil content water is transferred to sludge tanks and the low oil content water is transferred to the bilge water holding tank.

4.3 Discharge of oily bilge water

  4.3.1 Oily bilge water in the bilge water holding tank is discharged overboard through the oily water separator in accordance with Regulation 14 of the Convention.

  4.3.2 Clean water which has been processed trough the oil filtering equipment may only be discharged through the 15 ppm bilge alarm combined with an automatic stopping device by means of a separate clean water pump.

4.4 Discharge of clean drains

 Clean drains may be discharged overboard directly through the discharge arrangement, independent from the system for oily bilge water or oil.

4.5 Treatment of oil residue (sludge)

  4.5.1 Oil residue (sludge) may be collected in separate tanks designated for fuel oil residues and lubrication oil residues respectively.

  4.5.2 Water in oil residue (sludge) may be evaporated by heating in the oil residue (sludge) service tanks.

  4.5.3 Oil residue (sludge) may be incinerated by the sludge incineration system or disposed of to the reception facilities through the standard discharge connection.

4.6 Re-generating fuel oil from sludge

  4.6.1 Oil residue (sludge) may be used onboard as re-generated fuel. Oil residue (sludge) is collected in an oil residue (sludge) tank prior to processing (disposal) back into the fuel oil system as re-generated fuel oil.

  4.6.2 Oily drains should be recorded in the oil record book as any other oil residue (sludge) collection.

  4.6.3 Re-generation of fuel oil from oil residue (sludge) should be an approved means of disposal of oil residue (sludge) according to the Supplement to the IOPP Certificate.

  4.6.4 The re-generating process may include filtration, decanting or purification to remove unwanted heavy parts from the oil residue (sludge).

  4.6.5 The re-generated fuel oil when used in a SECA must comply with SECA fuel oil quality requirements.

  4.6.6 The re-generated fuel is fed back into the vessel's fuel oil system at a rate equal to or less than the average sludge production on board. This is in order not to change the emission level of the exhaust when using the fuel oil with added re-generated fuel oil compared to using fuel oil as delivered without prior sludge separation.

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