The buffer tank is not the mixer itself. Its role is to hold ready mixture after the dosing unit, absorb short demand swings, and make the supply line easier to regulate during production.
The main checks are receiver volume, working pressure, dimensions, valve and gauge package, inlet and outlet connection layout, and how many consumption points the prepared mixture must support.
Also called a gas buffer tank, mixed-gas receiver, or surge tank, it stabilizes prepared shielding and process-gas mixtures for welding, food packaging, and production lines. Cryofortune supplies gas mixture buffer tanks worldwide in a range of volumes and pressures, with export documentation.