# The basic parameters of the pump?

Published:2021-10-14

There are six basic parameters of **pump** performance, which are flow, head, speed, NPSH, power, etc. These basic parameters will be displayed in the **pump** sample or on the nameplate. The basic parameters of the main performance of the **pump** are as follows:

1. Flow rate Q Flow rate is the amount of liquid (volume or mass) delivered by the **pump** in a unit time. The volume flow is expressed by Q, and the unit is: m3/s, m3/h, l/s, etc. The mass flow rate is expressed by Qm, and the unit is: t/h, kg/s, etc. The relationship between mass flow and volume flow is: Qm=ρQ where ρ——the density of the liquid (kg/m3, t/m3), and clean water at room temperature ρ=1000kg/m3.

2. Head H Head is the increase in energy of the unit weight of liquid pumped by the **pump** from the **pump** inlet (**pump** inlet flange) to the **pump** outlet (**pump** outlet flange). That is, the effective energy of a Newtonian liquid obtained by the **pump**. Its unit is N·m/N=m, that is, the height of the liquid column of the pumped liquid, and it is often referred to as meter for short.

3. Rotation speed n Rotation speed is the number of revolutions of the **pump** shaft per unit time, expressed by the symbol n, and the unit is r/min.

4. The cavitation margin.

NPSH cavitation margin is also called net positive tip, which is the main parameter indicating cavitation performance. The NPSH has been expressed by Δh in China.

5. Power and efficiency The power of the **pump** usually refers to the input power, that is, the power on the shaft of the prime mover, so it is also called the shaft power, which is represented by P; the effective power of the **pump** is also called the output power, which is represented by Pe. Diaphragm **pump** is the effective energy obtained in the **pump** from the liquid delivered from the **pump** per unit time. Because the head refers to the effective energy obtained from the **pump** by the unit heavy liquid output by the **pump**, the product of the head, mass flow rate and gravitational acceleration is the effective energy obtained from the liquid output from the **pump** per unit time-that is, the **pump** Effective power: Pe=ρgQH(W)=γQH(W) where ρ——the density of the liquid conveyed by the **pump** (kg/m3); γ——the gravity of the liquid conveyed by the **pump** (N/m3); Q——the **pump**’s Flow rate (m3/s); H——**pump** head (m); g——gravitational acceleration (m/s2). The difference between the shaft power P and the effective power Pe is the power loss in the **pump**, and its magnitude is measured by the efficiency of the **pump**. The efficiency of the **pump** is the ratio of the effective power to the shaft power, expressed by η.

water pump,types of pump,centrifugal pump,pump shoes,what are the 4 types of pumps,pump restaurant

- Factors affecting the performance of car fans
- How to Choose the Right 12V Water Pump
- The working principle of energy storage fans
- Energy saving technology for car fans
- Application of 12V water pump in different water heaters
- Automotive Fan Noise Control Technology
- The Role of the 12V Water Pump in the Cooling System
- Design Principles for Efficient Car Fans
- The working principle of a 12V water pump
- Types of 12V Water Pumps and Their Characteristics