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ItoRO no. 13 - Interpretations of MARPOL Annex IV
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No. 13 - Interpretations of MARPOL Annex IV

(For the complete regulation see Wet voorkoming verontreiniging door schepen and MARPOL Annex IV)

The Netherlands Shipping Inspectorate is responsible for the enforcement of the ‘Wet voorkoming verontreiniging door schepen’ and the belonging regulations.

This law refers dynamically to the MARPOL Convention 1973

Application
Annex IV contains regulations for the prevention of pollution by sewage from ships. The provisions of this Annex shall apply to the following ships engaged in international voyages:

  1. newIntroduction
    shipsThe Netherlands Shipping Inspectorate is responsible for the enforcement of 400 gross tonnagethe ‘Wet voorkoming verontreiniging door schepen’, the belonging regulations and above; and MARPOL Annex IV. This law refers dynamically to the MARPOL Convention 1973.

  2. new ships of less than 400 gross tonnage which are certified to carry more than 15 persons; and
  3. existing ships of 400 gross tonnage and above, after September 28th 2008
  4. existingApplication
    Annex IV contains regulations for the prevention of pollution by sewage from ships. The provisions of less than 400 gross tonnage which are certifiedthis Annex shall apply to carry more than 15 persons, after September 28the following ships engaged in international voyages:
    th
    1. new ships of 400 gross tonnage and above; and

    2. new ships of less than 400 gross tonnage which are certified to carry more than 15 persons; and

    3. existing ships of 400 gross tonnage and above, after September 28th 2008

    4. existing ships of less than 400 gross tonnage which are certified to carry more than 15 persons, after September 28th 2008.
    2008

ShipsAbovementioned ships to which the annex applies are in possession of a certificate.

Article 5f of the ‘Regulation prevention of pollution from ships’, implements regulation 4.2 of Annex IV of MARPOL reading; “The Administration shall establish appropriate measures for ships which are not subject to the provisions of paragraph (1) of this regulation in order to ensure that the provisions of this Annex are complied with.”

This regulation concerns ships less than 400GT with a maximum of 15 persons on board. These ships general make short trips and the delivery of sewage in ports is in general possible. These ships may be equipped with a sewage collecting tank or a chemical toilet and don’t need an approved sewage treatment plant or a system of comminuting and disinfecting sewage. Based on article 12a of the Regulation, the Minister of Infrastructure and the Environment (RO is authorized) may issue a declaration of compliance for these ships on request of the shipowner. (Staatscourant 24 September 2008, nr. 185/page 16)

Interpretation unmanned pontoons more than 400 GT
The annexMARPOL Annex IV is not applicable for unmanned pontoons of(less or more than 400 GT).

Description
A new ship is a ship build on or after September 27th 2003.
Existing ships the keels of which are laid or which are of a similar stage of construction before October 2nd 1983 shall be equipped, as far as practicable, to discharge sewage in accordance with the requirements of regulation 11 of the Annex.

Sewage systems
Every ship, which is required to comply with this Annex, shall be equipped with one of the following sewage systems:

  1. Description
    A new ship is a sewage treatment plant ship built on or after September 27th 2003.
    Existing ships the keels of which are laid or which are of a similar stage of construction before October 2nd 1983 shall be type approved byequipped, as far as practicable, to discharge sewage in accordance with the organisationrequirements1; of regulation 11 of the Annex.

  2. a approved sewage comminuting and disinfecting system, with sufficient storage capacity;
  3. a holdingSewage systems
    tank of sufficient capacity. The holding tankEvery ship, which is required to comply with this Annex, shall have means to indicate visuallybe equipped with one of the amount of its contents; following sewage systems:

    1. a sewage treatment plant which shall be type approved by the organisation1;

    2. an approved sewage comminuting and disinfecting system, with sufficient storage capacity;

    3. a holding tank of sufficient capacity. The holding tank shall have means to indicate visually the amount of its contents;

    4. in all cases a standard discharge connection conform MARPOL Annex IV, Regulation 10.

  4. in all cases Interpretation of visually indication
    The use of a standard discharge connection conform Annex IV Reg 10sounding rod is not allowed because of hygienic reasons.

  5. Interpretation on minimum contents of the holding tank


    Volume of sewage in litres per person per day:
    Without vacuum plantWith vacuum plant
    Black waterGrey and black waterBlack waterGrey and black water
    Passenger ships7023025185
    Other ships7018025

    135


Interpretation visually indication the amount of its content
The use of a sounding rod is not allowed because of hygienic reasons.

Interpretation minimum contents of holding tank

Volume of sewage in litres per person per day

Without vacuum plantWith vacuum plant
Black waterGrey and black waterBlack waterGrey and black water
Passenger ships7023025185
Other ships7018025135


The content of the sewage tank should be enough for three days as a minimum, unless there are circumstances justifying a smaller capacity.



The content of the sewage tank should be enough for three days as a minimum, unless there are circumstances justifying a smaller capacity

Discharge of sewage
The discharge of sewage into the sea is prohibited, except when:

  1. the ship has in operation an approved sewage treatment plant
  2. the ship is discharging comminuted and disinfected sewage at a distanceDischarge of moresewage
    than 3 nautical miles from the nearest land orThe discharge of sewage whichinto the sea is not comminuted and disinfectedprohibited, except when:

    at
    1. the ship has in operation an approved sewage treatment plant

    2. the ship is discharging comminuted and disinfected sewage at a distance of more than 3 nautical miles from the nearest land or sewage which is not comminuted and disinfected at a distance of more than 12 nautical miles from the nearest land

    3. the ship operates in the waters under the jurisdiction of a state in accordance with such less stringent requirements as may imposed by such state.
    a distance of more than 12 nautical miles from the nearest land
  3. the ship operates in the waters under the jurisdiction of a state in accordance with such less stringent requirements as may imposed by such state.

Discharge of sewage that has been stored in holding tanks shall not be discharged instantaneously but at a moderate rate when the ship is en route and proceeding at not less than 4 knots. The rate shall be approved by the administration according to IMO resolution MEPC.157(55).
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Note

Note:
This instruction (in the form of an interpretation) was already in use from . In this 3th version there is one amendment.
• The inclusion of the dateapplication of entry into forcethe requirements of MARPOL Annex IV. In this version there are two amendments on ships less than 400 GT and not carrying more than 15 persons.

  • The standard discharge connection should always be present independent of the way of treatment or storage.
  • For hygienic reasons, from the date of entry info force of this amendment a sounding rod is not allowed in order to determine the contents of the sewage tank.


This instruction enters into force from August 1December 1stst 20092012



1 . Refer to the Recommendation on international effluent standards and guidelines for performance tests for sewage plants adopted by resolution MEPC.2(VI). For existing ships, national standards are acceptable.

1Refer to the Recommendation on international effluent standards and guidelines for performance tests for sewage plants adopted by resolution MEPC.2(VI) and after 1 January 2010 MEPC.159(55). For existing ships, national standards are acceptable.