Reg. 30.2 – Piping arrangements for discharge above the waterline
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Reg. 30.2 – Piping arrangements for discharge above the waterline

  56.1 Under regulation 30.2 lines for discharge to the sea above the waterline must be led either:

  • .1 to a ship’s discharge outlet located above the waterline in the deepest ballast condition; or

  • .2 to a midship discharge manifold or, where fitted, a stern or bow loading/discharge facility above the upper deck.

  56.2 The ship’s side discharge outlet referred to in 56.1.1 should be so located that its lower edge will not be submerged when the ship carries the maximum quantity of ballast during its ballast voyages, having regard to the type and trade of the ship. The discharge outlet located above the waterline in the following ballast condition will be accepted as complying with this requirement:

  • .1 on oil tankers not provided with SBT or CBT, the ballast condition when the ship carries both normal departure ballast and normal clean ballast simultaneously; and

  • .2 on oil tankers provided with SBT or CBT, the ballast condition when the ship carries ballast water in segregated or dedicated clean ballast tanks, together with additional ballast in cargo oil tanks in compliance with regulation 18.3.

  56.3 The Administration may accept piping arrangements which are led to the ship’s side discharge outlet located above the departure ballast waterline but not above the waterline in the deepest ballast condition, if such arrangements have been fitted before 1 January 1981.

  56.4 Although regulation 30.2 does not preclude the use of the facility referred to in 56.1.2 for the discharge of ballast water, it is recognized that the use of this facility is not desirable, and it is strongly recommended that ships be provided with either the side discharge outlets referred to in 56.1.1 or the part flow arrangements referred to in regulation 30.6.5.

Parent topic: 56 Pumping and piping arrangements
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