A blood processing system, wherein said blood processing system comprises a centrifuge , and wherein said centrifuge comprises a first port , a second port , and a third port , said blood processing system being configured to execute a method comprising the steps of: loading a first fluid into said centrifuge through said first port ; executing a first purging operation comprising: executing a first pressurizing step comprising pressurizing said centrifuge to a first pressure threshold; rotating said centrifuge ; and executing a first directing step comprising directing air out of said centrifuge through said third port after completing said first pressurizing step; and characterized by : executing a second purging operation after a completion of said first purging operation and with said centrifuge being stationary, wherein said second purging operation comprises: executing a second pressurizing step comprising pressurizing said centrifuge to a second pressure threshold; and executing a second directing step comprising directing air out of said centrifuge through said second port after completing said second pressurizing step; and executing a third purging operation after a completion of said second purging operation, wherein said second purging operation comprises: executing a third pressurizing step comprising pressurizing said centrifuge to a third pressure threshold; rotating said centrifuge ; and executing a third directing step comprising directing air out of said centrifuge through said second port after said third pressurizing step. loading a first fluid into said centrifuge through said first port ; executing a first purging operation comprising: executing a first pressurizing step comprising pressurizing said centrifuge to a first pressure threshold; rotating said centrifuge ; and executing a first directing step comprising directing air out of said centrifuge through said third port after completing said first pressurizing step; and characterized by : executing a first pressurizing step comprising pressurizing said centrifuge to a first pressure threshold; rotating said centrifuge ; and executing a first directing step comprising directing air out of said centrifuge through said third port after completing said first pressurizing step; and characterized by : executing a second purging operation after a completion of said first purging operation and with said centrifuge being stationary, wherein said second purging operation comprises: executing a second pressurizing step comprising pressurizing said centrifuge to a second pressure threshold; and executing a second directing step comprising directing air out of said centrifuge through said second port after completing said second pressurizing step; and executing a second pressurizing step comprising pressurizing said centrifuge to a second pressure threshold; and executing a second directing step comprising directing air out of said centrifuge through said second port after completing said second pressurizing step; and executing a third purging operation after a completion of said second purging operation, wherein said second purging operation comprises: executing a third pressurizing step comprising pressurizing said centrifuge to a third pressure threshold; rotating said centrifuge ; and executing a third directing step comprising directing air out of said centrifuge through said second port after said third pressurizing step. executing a third pressurizing step comprising pressurizing said centrifuge to a third pressure threshold; rotating said centrifuge ; and executing a third directing step comprising directing air out of said centrifuge through said second port after said third pressurizing step. <EOS>