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5
Flare lines
To guarantee that there is always
an open path to the are
Boiler blow-down
To prevent that the drain and vent
are opened at the same time
2 out of 3
To guarantee that always two out of
three instruments (i.e. pressure
gauge, level gauge) are online
Chemical dosing
To guarantee that the pot is isolated
before lling
Amine absorber
To guarantee that the drain can
only be opened when the vessel
is isolated
Basic principles
Valve interlocks are permanently mounted to the valve and
guide the operator through a predened sequence with
unique keys for each step.
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