A centrifugal pump assembly, a first-stage pump unit having an impeller, and axial inlet on one side of the impeller and an outlet, a second-stage pump unit having an impeller and an axial inlet connected to the first-stage outlet on one side of the impeller, and an outlet, said second-stage impeller being supported and driven by a shaft, inboard seal means sealing said shaft on the side of said second-stage impeller opposite the second-stage inlet, centrifugal seal means on said shaft between said inboard seal means and the second-stage impeller, BALANCING VALVESand means for conveying a portion of the main pump fluid from the inlet of the first-stage pump unit to the centrifugal seal means to minimize boiling of the fluid as it passes through the centrifugal seal means. Forged Steel ValvesA first-stage pump unit having an impeller, an axial inlet on one side of the impeller and an outlet, a second-stage pump unit having an impeller and axial inlet connected to the first stage outlet on one side of the impeller, and an outlet, said first and second pump units having common drive means, said second-stage impeller being supported and driven by a shaft, inboard seal means supporting said shaft on the side of said second-stage impeller opposite the second-stage inlet, centrifugal seal means on said shaft between said inboard seal means and the second stage impeller, and means responsive to inlet flow to the first-stage pump unit for conveying a cool buffer fluid to said centrifugal seal means to minimize boiling.

MORE NEWS

2011-12-08

Back