7.4 Thermal oxidation of 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 - 7.4 Thermal oxidation of vapours

7.4 Thermal oxidation of vapours

  7.4.1 General

 Maintaining the cargo tank pressure and temperature by means of thermal oxidation of cargo vapours, as defined in 1.2.52 and 16.2 shall be permitted only for LNG cargoes. In general:

  • .1 thermal oxidation systems shall exhibit no externally visible flame and shall maintain the uptake exhaust temperature below 535°C;

  • .2 arrangement of spaces where oxidation systems are located shall comply with 16.3 and supply systems shall comply with 16.4; and

  • .3 if waste gases coming from any other system are to be burnt, the oxidation system shall be designed to accommodate all anticipated feed gas compositions.

  7.4.2 Thermal oxidation systems

 Thermal oxidation systems shall comply with the following:

  • .1 each thermal oxidation system shall have a separate uptake;

  • .2 each thermal oxidation system shall have a dedicated forced draught system; and

  • .3 combustion chambers and uptakes of thermal oxidation systems shall be designed to prevent any accumulation of gas.

  7.4.3 Burners

 Burners shall be designed to maintain stable combustion under all design firing conditions.

  7.4.4 Safety

  7.4.4.1 Suitable devices shall be installed and arranged to ensure that gas flow to the burner is cut off unless satisfactory ignition has been established and maintained.

  7.4.4.2 Each oxidation system shall have provision to manually isolate its gas fuel supply from a safely accessible position.

  7.4.4.3 Provision shall be made for automatic purging the gas supply piping to the burners by means of an inert gas, after the extinguishing of these burners.

  7.4.4.4 In case of flame failure of all operating burners for gas or oil or for a combination thereof, the combustion chambers of the oxidation system shall be automatically purged before relighting.

  7.4.4.5 Arrangements shall be made to enable the combustion chamber to be manually purged.

Parent topic: Chapter 7 — Cargo Pressure/Temperature Control
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