Flow rate Flow rate , Q The flow rate of a pump is defined by the amount of liquid that is being discharged by the pump per unit time. Some commonly used units of flow rate are l/s, l/min, m3/h, and gal/min. Th... Pump Terms 2025/10/07
Vibration& Noise Vibration When the motor of a pump is connected to the power supply, the motor rotates to drive the pump impeller, generating vibration. Table 1 in ISO 15783 provides the maximum allowable vibration l... Pump Terms 2025/10/06
Pump Total Head Pump Total Head, H The pump total head is defined as follows: Where, = density of the liquid = acceleration due to gravity = suction height at p1 = discharge height at p2 = suction pressure = discharg... Pump Terms 2025/10/06
Viscosity&s.g Viscosity Viscosity is an indication of how easily a fluid flows. When a fluid flows, the interaction between the molecules within the fluid creates resistance, which is shear stress. The relationship... Pump Terms 2025/10/04
Net Positive Suction Head Net Positive Suction Head, NPSH Net positive suction head is the head above the vapor pressure of the liquid. From a pressure point of view, it is the amount of absolute pressure to overcome the liqui... Pump Terms 2025/10/03
Specific Speed Specific speed, Specific speed is the relation between the impeller’s rotation speed and the rated flow rate and head. It is the most important factor to consider in the design of the impeller. The un... Pump Terms 2025/10/02
Axial Force&Radial Force Axial force, Axial force is the pressure exerted by the pumped liquid on the impeller in the axial direction during operation. The impeller on the seal-less pump is not fixed in the axial direction. T... Pump Terms 2025/10/01
Power&Efficiency Hydraulic Power, Hydraulic power is the power delivered by the pump in the form of flow rate and head. Hydraulic power is defined by Where, = density of the liquid = acceleration due to gravity = pump... Pump Terms 2025/09/30
Section 1: What do I need before I make a pump selection? Part1 Part 1 - Duty Point What is the duty point of an application? The duty point of the application is the point on the pump curve at which the pump operates. It is a combination of flow rate and head for... How to Design a Pump System 2025/09/06
Section 1: What do I need before I make a pump selection? Part2 Part 2 - Chemical Characteristics A chemical has several characteristics. Characteristics include physical characteristics and chemical characteristics. Some of the properties of the chemical will aff... How to Design a Pump System 2025/09/05
Section 1: What do I need before I make a pump selection? Part3 Part 3 - Operating Condition The operating condition of a pump refers to external factors that could impact the operation of the pump. Operating conditions include temperature, the type of application... How to Design a Pump System 2025/09/04
Section 2: What kind of pumps are needed? Part 1 - Pump types: an overview Generally, pumps fall under two broad categories. The first category is centrifugal pumps , where the fluid is moved by rotating an impeller or propeller. The rotation... How to Design a Pump System 2025/09/03