Abstract: A set of seals is installed on the impeller of a centrifugal pump that allows a low viscosity fluid to be injected into a chamber between the impeller shroud and the casing sidewall. A seal ring, with a number of grooves formed in it is installed on the tip of the impeller. Another seal ring is mounted at the leading edge of the eye of the impeller. The gas is picked up by the grooves in the impeller tip ring inside diameter and is compressed by centrifugal force to a higher pressure than the discharge pressure of the impeller. It is then injected into the pumpage stream. The eye ring seals have pockets or grooves and inject gas at a low volume into the eye of the impeller.