The HPM process pumps are multistage, axially split, volute type pumps with single or double suction first stage impeller that meet all requirements of the latest edition of API 610 standards. Casing is axially split; suction and discharge nozzles are integrally cast with the lower half casing. A crossover on integrally cast into the upper half casing to delivery pumped fluid from the first set of stages to the other stages. Axial thrust is eliminated by back-to-back configuration of the impellers within the rotor. The double volute design minimizes the hydraulic radial forces, thus reducing shaft deflection. Single impellers and the complete rotor are dynamically balanced to reduce vibrations. Shaft dynamic characteristics were precisely engineered to reduce deflection under the most severe operating conditions.