Glossary of Pump Terms: N
Negative pressure: Negative pressure refers to a pressure below atmospheric pressure, which is typically defined as one atmosphere. It indicates a pressure lower than the surrounding environment.
Newton: The Newton is the unit of force in the International System of Units (SI). It is equal to the force required to accelerate a mass of one kilogram by one meter per second squared.
Newtonian fluid: A Newtonian fluid is a type of fluid that exhibits a constant viscosity regardless of the rate of flow. Its viscosity remains unchanged under different shear rates or stress.
Non-destructive examinations (NDE): Non-destructive examinations, also known as non-destructive testing (NDT), are processes used to inspect pumps or pump components for defects without causing damage to the examined component. These techniques allow for thorough evaluation and detection of flaws or weaknesses in a non-invasive manner.
Non-lubricant: A non-lubricant is a fluid that does not possess lubricating properties and does not reduce friction between moving parts. Unlike lubricants, non-lubricants do not provide a protective layer or minimize wear between surfaces.
Non-Newtonian liquid: A non-Newtonian liquid is a type of fluid whose viscosity changes with varying flow rates or shear stress. Unlike Newtonian fluids, the viscosity of non-Newtonian liquids is not constant and can exhibit different behavior under different flow conditions.
Normal operating point: The normal operating point refers to the specific conditions at which a pump typically operates during normal operation. It may or may not coincide with the best efficiency point or the rated operating point of the pump.
Nozzle head: The nozzle head is the part of a pump where the fluid is discharged. It is designed with a reduced diameter to increase the velocity of the fluid as it exits the system, resulting in faster flow compared to its flow through the system.
NPSHA: Net Positive Suction Head Available (NPSHA) is a measure of the total suction head that a pump has available to prevent cavitation. It is calculated by summing the static head, surface pressure head, and the pressure head due to the fluid’s vapor pressure, while subtracting the friction losses caused by piping, valves, and fittings.
NPSHR: Net Positive Suction Head Required (NPSHR) is the minimum suction head that a pump requires to operate without experiencing cavitation. It is a characteristic of the pump and is typically determined by the manufacturer using cold water during the calculation process.
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