3.12 Isolation of cargo tanks from the inert gas deck main (regulation 62.11)
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3.12 Isolation of cargo tanks from the inert gas deck main (regulation 62.11)

  3.12.1 For gas-freeing and tank entry some valve or blanking arrangement is always fitted to isolate individual cargo tanks from the inert gas deck main.

  3.12.2 The following factors should be considered in choosing a suitable arrangement:

  • .1 protection against gas leakage or incorrect operation during tank entry;

  • .2 ease and safety of use;

  • .3 facility to use the inert gas main for routine gas-freeing operations;

  • .4 facility to isolate tanks for short periods for the regulation of tank pressures and manual ullaging;

  • .5 protection against structural damage due to cargo pumping and ballasting operations when a cargo tank is inadvertently isolated from the inert gas main.

  3.12.3 In no case should the arrangement prevent the proper venting of the tank.

  3.12.4 Some examples of arrangements in use are shown in figure 15.

Parent topic: 3 Function and Design Considerations
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