29.2.1 Sewage
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Statutory Documents - MCA Publications - MGN 280 - Small Vessels in Commercial Use for Sport or Pleasure, Workboats and Pilot Boats - Alternative Construction Standards - 29 Clean Seas - 29.2 Requirements for Preventing Pollution of the Sea - 29.2.1 Sewage

29.2.1 Sewage

  29.2.1.1 When the direct overboard discharge from a water closet is prohibited by administrations/authorities in an area of operation, the provision of "holding tanks" of sufficient capacity to store waste for discharge to shore facilities may be needed for a vessel to comply.

  29.2.1.2 There are two standard pump out connections, ISO 8099 which is a one and a half inch pipe thread (in accordance with ISO 228-1) and MARPOL which is a 16mm thick flange having four 18mm diameter holes on a 170mm pitch circle diameter.

  29.2.1.3 If sewage holding tanks are fitted they should be constructed with a sloping bottom arranged such that the outlet is at the lowest point. Ventilation arrangements should be routed well clear of accommodation and sleeping quarters. Outlets from ventilation should not be near ventilation or machinery inlets and should not pose a danger to other vessels alongside. Tanks should be manufactured from material not susceptible to corrosion in anaerobic decomposition conditions.

  29.2.1.4 The UK is in the process of transposing the revised Annex IV of MARPOL into national legislation. This will implement requirements for vessels over 400GT, or vessels of less than 400GT certified to carry 15 or more persons

Parent topic: 29.2 Requirements for Preventing Pollution of the Sea
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