What are Category X,Y,Z and OS in Noxious liquid substances in bulk under Annex 2 of Marpol.

Noxious Liquid Substance in bulk can be divided into these four categories :

  • Category X: Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a major hazard to either marine resources or human health and, therefore, justify the prohibition of the discharge into the marine environment.
  • Category Y: Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a hazard to either marine resources or human health or cause harm to amenities or other legitimate uses of the sea and therefore justify a limitation on the quality and quantity of the discharge into the marine environment;
  • Category Z: Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment and
  • Other Substances: substances which have been evaluated and found to fall outside Category X, Y or Z because they are considered to present no harm to marine resources, human health, amenities or other legitimate uses of the sea when discharged into the sea from tank cleaning of deballasting operations. The discharge of bilge or ballast water or other residues or mixtures containing these substances are not subject to any requirements of MARPOL Annex II.

What is difference between SOPEP and SMPEP ? Which vessel should carry SOPEP and SMPEP.

You can find more about SOPEP under Annex I, SMPEP on the other hand is under Annex II of MARPOL 73/78. Thus, SOPEP covers the prevention of pollution arising from an oil pollution incident and SMPEP prevents or controls pollution by Noxious Liquid Substances or chemicals.

Do all ships have SOPEP and SMPEP?

Every oil tanker of 150 gross tonnage and above and every ship other than an oil tanker of 400 gross tonnage and above shall carry on board a shipboard oil pollution emergency plan approved by the Administration.”

Every ship of 150 gross tonnage and above certified to carry noxious liquid substances in bulk shall carry on board a shipboard marine pollution emergency plan for noxious liquid substances approved by the Administration.”

Now what if vessel is carrying both oil as well as chemical ?

Vessels certified to carry oil and noxious liquid substances can only have an approved Shipboard Marine Pollution Emergency Plan (SMPEP) in accordance with regulation 37 of Annex I and regulation 17 of Annex II.

International Oil Pollution Prevention Certificate (IOPP)

International Oil Pollution Prevention Certificate (IOPP)

When all the equipment has been surveyed, an IOPP certificate is issued to the ship. The certificate is issued for a period of 5 years and subject to annual endorsements. It is supplemented by a record of construction and equipment for ships which lists all the equipment and arrangement as required depending on the type of ship tanker or other ship.

Form A is other than tankers above 400GRT and Form B is Tankers above 150GRT

What does the certificate signify?

That the ship has been surveyed in accordance with regulation 6 of Annex I of the Convention.

That the survey shows that the structure, equipment, systems, fittings, arrangement and material of the ship and the condition thereof are in all respects satisfactory and that the ship complies with the applicable requirements of Annex I of the Convention.