ALFA LAVAL'S MR LIQUID RING MODELS ARE WIDELY USED TO PUMP LIQUIDS CONTAINING GASES. THE LIQUID RING IS SELF PRIMING WHEN AT LEAST HALF FILLED WITH LIQUID. SO IT IS CAPABLE OF PUMPING FROM A SUCTION LINE PARTLY FILLED WITH AIR. BECAUSE THEY ARE SELF PRIMING. THEY SERVE AS IDEAL RETURN PUMPS IN CIP SYSTEM.