System and method for treatment of a biomass material， a transporting pipe， and a gas separation system

A system for treatment of a biomass material and a method for transporting biomass material， said system comprising:a first vessel (3) in which said biomass material is treated at a first pressure; - a second vessel (5) in which said biomass material is collected at a second pressure which is lower than the first pressure;- a transporting pipe (7) connecting an outlet (9) of the first vessel (3) with an inlet (11) of the second vessel (5) for transporting the biomass material from the first vessel to the second vessel，wherein said transporting pipe (7) comprises at least one restriction (13) for control of the flow in the transporting pipe and hereby providing a pressure drop to the transported biomass material， wherein at least one of said at least one restriction (13) is provided somewhere in the second half of the length of the transporting pipe (7) starting from the first vessel (3) and ending at the second vessel (5).