7.3 Reliquefaction of cargo vapours
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.370(93) – Amendments to The International Code for The Construction and Equipment of Ships Carrying Liquefied Gases In Bulk (IGC Code) – (Adopted on 22 May 2014) - Annex - Amendments to The International Code for The Construction and Equipment of Ships Carrying Liquefied Gases In Bulk (IGC Code) - Chapter 7 — Cargo Pressure/Temperature Control - 7.3 Reliquefaction of cargo vapours

7.3 Reliquefaction of cargo vapours

  7.3.1 General

 The reliquefaction system may be arranged in one of the following ways:

  • .1 a direct system, where evaporated cargo is compressed, condensed and returned to the cargo tanks;

  • .2 an indirect system, where cargo or evaporated cargo is cooled or condensed by refrigerant without being compressed;

  • .3 a combined system, where evaporated cargo is compressed and condensed in a cargo/refrigerant heat exchanger and returned to the cargo tanks; and

  • .4 if the reliquefaction system produces a waste stream containing methane during pressure control operations within the design conditions, these waste gases, as far as reasonably practicable, are disposed of without venting to atmosphere.

 Note:

  • The requirements of chapters 17 and 19 may preclude the use of one or more of these systems or may specify the use of a particular system.

  7.3.2 Compatibility

 Refrigerants used for reliquefaction shall be compatible with the cargo they may come into contact with. In addition, when several refrigerants are used and may come into contact, they shall be compatible with each other.

Parent topic: Chapter 7 — Cargo Pressure/Temperature Control
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