PURPOSE: To reduce damage caused during transportation and working such as packaging, depackaging, loading, unloading, etc., when gas centrifugal separator is delivered to a site as well as reduce working such as cleaning, reassembly, etc., at site.

CONSTITUTION: When transporting a gas centrifugal separator consisting of the vacuum vessel 3 and the rotary drum 4 provided rotatably in the inside of the vacuum vessel 3, the fixing tool 6 is provided between the rotary drum 4 supported by the lower bearing mechanism 5 and the piping flange 1. By clamping the piping flange 1 by an adequate claming force to push the rotary drum 4 against the lower bearing mechanism 5 in order to fix it in both axial and circumferential directions, damage, etc., during transportation can be prevented. All that needs at site is to remove the fixing tool 6 alone.