Know Bilge system onboard ship by using line diagram

  • The engine room bilge on most ships having oily water.
  • This is because leaks from various machinery and systems finally find their way into the bilges.
  • However, some ships maintain a clean bilge condition, without any water or oil in the engine room.
  • The oily bilges should never be pump directly overboard.
  • On most ships today, the engine room bilges, usually located at the four corners of the engine room, is first transferred to a decanting tank.
  • Here they are allowed to settle and separation of oil takes place by gravity.
  • The tank is also provided with steam heating as heating assists separation.
  • Oil is skimmed from the top or drained to the sludge tank.
  • The water is drained to the bilge holding tank.
  • From here, the bilge water is pumped overboard through the oily water separator, and the oil concentration of the affluent, the discharge water does not exceed 15 ppm.
  • The separated oil from the oily water separator discharges into a sludge tank.
  • Sludge tanks are storage tank for oily water with a high percentage of oil and little water.
  • The sludge pumps transfer the oily sludge to the incinerator waste oil tanks after which they are incinerated in the incinerator.

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