MARINE INERT GAS SYSTEMS

Since it is now compulsory for inert gas to be supplied to cargo tanks when crude-oil washing is being done, and inert gas (IG) systems will in future have to be installed on tankers and product carriers of 20,000 dwt and above, the author describes the different systems according with IMCO guidelines. The IG specification commonly required for crude-oil tankers is given in a table. It can be obtained from flue gas or IG generators, both of which are discussed. Until recent years IG sytems have mainly been fitted to crude-oil tankers and these installations, with small variations, are basically unaltered. This does not apply to their use in products tankers because a variety of products and chemicals are carried. Their differing properties mean that the type of IG system chosen involves careful selection. Flue gas from ships' boilers contains large solids and sulphur content, so that a high-efficiency scrubber is needed to prevent large quantities of soot passing through and creating maintenance problems on valves, blowers, and other components. Deck seals to protect the safe area of a vessel are also briefly mentioned. Any build-up of gas pressure is contained in the area forward of the seal, preventing hydrocarbons getting aft to machinery spaces.

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    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • Norledge, T K
  • Publication Date: 1980

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Filing Info

  • Accession Number: 00323284
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM