Process

A polymerisation process comprising a plurality of processing steps in which an inert gas is used or is provided as a back-up, each of said processing steps being assigned a ranking based on the requirement for an inert gas flow in the processing step,

• said polymerisation process being characterised in that in the event of a loss of normal operating conditions the control system controls the supply of the available inert gas based on said rankings.

A process for controlling the supply of inert gas to one or more processing steps of a polymerisation process in the event of a loss of normal operating conditions, said process being characterised in that the supply of available inert gas to the processing steps is controlled based on the requirement for an inert gas flow in each processing step.

A process control system for a polymerisation process, said polymerisation process comprising a plurality of processing steps in which an inert gas is used or is provided as a back-up, said process control system being characterised in that each of said processing steps is assigned a ranking based on the requirement for an inert gas flow in the processing step in the event of a loss of normal operating conditions, and the process control system controls the supply of the available inert gas to the processing steps based on said rankings.