5.2 Operation Safety regulations all centrifugal separators the bowl rotates at a very high speed, normally between 100 and 150 revolutions per second. Thus, very great forces are released and it is essential. therefore. to follow strictly the directions given in the Instruction Book concerning assembly of parts, starting, stopping and overhaul5.2 Operation Safety regulations • In all centrifugal separators the bowl rotates at a very high speed, normally between 100 and l50 revolutions per second. Thus, very great forces are released and it is essential, therefore, to follow strictly the directions given in the Instruction Book concerning assembly of parts, starting, stopping and overhaul