- At least one of the vessels must be able to permanently monitor the oxygen content of the vapour stream. The sample point must be close to the manifold and audible and visual alarms are to be available should the oxygen content exceed 7% by volume.
- The oxygen content of all tanks in the common system is to be maintained at a level no higher than 7% by volume.
- The vapour transfer hose is to be purged of air using inert gas or nitrogen until the oxygen content is below 7% before transfer commences.
- Vapour manifold valves are not to be opened until the receiving vessel system pressure exceeds that of the discharging vessel system pressure.
During the Cargo Transfer:
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