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Nominal ratio

Nominal ratio

The "actual Ratio" multiplied by a factor to account for losses due to internal friction in the pump. This number is normally used to determine the maximum attainable pressure where some flow can still occur. The friction factor normally used for pumping non-lubricating fluids is .88( 12% friction). For lubricated fluids, it will be lower percentage, and the stall pressure will be somewhat higher. (077)