Method for controlling a gas flow between a plurality of gas streams

Apparatus for controlling the gas flow between one or more incoming streams and one or more outgoing streams through a conjunction;

• comprising:
• one or more incoming flow measurers each able to provide one or more respective incoming mass flow measurement values representing the flow of the one of the respective incoming streams;
• one or more outgoing flow measurers each able to provide one or more respective mass outgoing flow measurement values representing the flow of the one of the respective outgoing stream;
• one or more pressure measurers able to measure a quantity indicative of the pressure of gas at the conjunction to provide a conjunction pressure measurement;
• one or more flow adjusters to adjust the flow of at least one of the incoming and outgoing streams;
• a controller to provide a biased mass flow imbalance value by comparing the aggregate of the incoming mass flow measurement values of the incoming flow measurers with the aggregate of the outgoing mass flow measurement values of the outgoing flow measurers and adding a bias component to provide the biased mass flow imbalance value;
• receive the conjunction pressure measurement;
• instruct the one or more flow adjusters to adjust the flow of at least one of the incoming and outgoing streams to move the mass flow imbalance value towards zero;
• and adjust the bias component of the biased mass flow imbalance value in response to a change in the conjunction pressure measurement relative to a pressure set point to mitigate the change in the conjunction pressure measurement relative to the pressure set point.