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STM pumps are dynamic designs that can develop high head without over pressurizing systems as with P.D. pumps. Turbine pumps generate much higher heads (3-SX) than centrifugal pumps and withstand up to 20% vapor as opposed to < 1 %. STM pumps feature a steep performance curve to accommodate varying head conditions. Thus avoiding high head cavitation and pump damage due to frictional heat from internally circulated process liquid.