3.2 Pressure Rating

The design pressure should be to API-620 or equivalent. This sets the specification for the relief system as well as minimizing breathing losses during ambient temperature changes and enabling vapour conservation measures during filling. Containment of breathing losses during a temperature rise of the contents of 20 °C should be considered. Preferably the vents should be connected to a vapour collection and recovery or treatment system and thus minimize hydrocarbon emission.

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