How to choose a suitable multistage centrifugal pump？

How to choose a suitable multistage centrifugal pump?

Multistage pumps are widely used in various industries, such as boiler water supply, constant pressure frequency conversion system, fire protection system, irrigation, etc. The working principle of the centrifugal pump is to provide centrifugal force through the rotation of the impeller. The single-stage pump is equipped with only one impeller, and the multistage pump is formed by connecting multiple impellers in series. The maximum number of impellers that can be achieved is 12.

Multistage centrifugal pumps are divided into vertical multistage pumps and horizontal multistage pumps. The working principle is the same and it is easy to distinguish from the appearance.

Vertical centrifugal pump:

The water inlet and outlet are on the same level and can be directly used in pipelines, making installation very convenient. Just like a valve, it can be easily connected to the pipeline system without the need for additional complicated connection devices.

The overall structure is compact, small in size, light in weight, low in noise, significant in energy saving, and easy to maintain. Vertical multi-stage centrifugal pump requirements for the medium: it is best to contain no particles or a small amount of tiny particles. Clean media is certainly better.

Vertical multistage pumps are widely used in various fields. In the oil and natural gas industry, it can be used to transport crude oil, natural gas, etc.; in the chemical industry, it can transport various chemical substances such as acids, alkalis, and salts; in the paper industry, it can handle liquid materials such as pulp; in the food and beverage industry, Ensure the safe transportation of liquids; in power plants, used in circulating cooling water and boiler water supply systems, etc.

A suitable vertical multi-stage pump can not only improve production efficiency, but also ensure the stable operation of equipment and reduce energy consumption and maintenance costs. For example, the high-efficiency and energy-saving vertical multi-stage pump can effectively reduce energy consumption and save costs for enterprises; its compact structure makes it easy to install in places with limited space, saving installation space; its smooth operation, safety and reliability ensure The long-term stable operation of the equipment reduces downtime and maintenance costs; while high-quality materials and precision manufacturing technology ensure the service life of the pump and reduce the frequency of equipment replacement.

Ⅰ.Key points for selection

(1)Clearly define the required parameters

1. Whether the medium transported by the pump contains solid particles. If the medium contains solid particles, the size of the particles needs to be considered. If the medium is corrosive, then a pump made of corrosion-resistant material, such as a vertical multistage pump made of stainless steel, needs to be selected. Selecting a suitable vertical multistage pump according to the characteristics of different media can ensure the stable operation of the pump, extend the service life of the pump, and reduce maintenance costs.

2. Pumping flow, head, inlet pressure and outlet pressure, etc.

Flow refers to the volume of liquid passing through the pump per unit time, which determines the pump's delivery capacity. If the actual required flow is large, a pump with a large flow needs to be selected.

Head refers to the height to which the pump can lift the liquid, which is closely related to the inlet pressure and outlet pressure. The difference between the inlet pressure and the outlet pressure determines the resistance that the pump needs to overcome, thereby affecting the pump head selection.

Technical parameters:

Flow rate: 2-160m3/h;

Lift: 24-200m;

Power: 1.1-90kw;

Speed: 2900r/min;

Diameter: φ25-φ150;

Temperature range: -15-+120℃

(2) Consider life cycle costs

We should not only focus on the purchase cost, but also consider the investment, operation and maintenance costs. Choosing a vertical multistage pump by focusing only on the purchase cost may bring many problems. First, low-priced pumps may have deficiencies in quality and performance, resulting in frequent failures during use, increasing maintenance costs and downtime, and affecting production efficiency. Second, low-quality pumps may have high energy consumption, and long-term operation will increase energy costs. Moreover, the after-sales service of some low-priced pumps may be imperfect, and it is difficult to get timely and effective solutions when problems arise.

.

(3) Other factors

Power supply Ensure that the power required for the pump meets the requirements of existing facilities. Different countries use different voltages and frequencies, and it is necessary to communicate with technicians whether customization is required. It is necessary to ensure that the power required for the pump meets the requirements of existing facilities. If the power demand of the pump exceeds the power supply capacity of the existing facilities, a power upgrade may be required, which will increase costs and engineering complexity. At the same time, the stability and reliability of the power should also be considered to ensure that the pump can operate normally.

II.Comparison between vertical multistage pumps and horizontal multistage pumps

I. Installation space

Vertical multistage pumps:

The structural feature of vertical multistage pumps is that the pump shaft is perpendicular to the ground. It occupies a small area during installation and is suitable for places with narrow space and limited ground area. For example, in the basement machine room of some high-rise buildings, since the space is mainly used to place other large equipment and pipelines, the use of vertical multistage pumps can effectively utilize the vertical space and reduce the occupation of ground space.

Horizontal multistage pumps:

The pump shaft of the horizontal multistage pump is placed horizontally. It requires a larger flat installation space, but its advantage is that the installation height is lower, which is more suitable for some places with restrictions on equipment height (such as low-height pump rooms). Moreover, it is easier to approach each component for operation during installation and maintenance, because all components are basically on the same height plane.

2. Operation stability

Vertical multistage pumps:

Due to the higher center of gravity, vertical multistage pumps are more likely to shake during operation, especially when subject to some external interference (such as pipeline vibration, water flow impact, etc.) than horizontal multistage pumps. However, modern vertical multistage pump designs are usually equipped with good support structures and shock absorbers to reduce this instability.

Horizontal multistage pump:

The horizontal multistage pump has a lower center of gravity and better stability. It can better withstand the stress of the pipeline and various forces during operation. In some occasions with strict vibration requirements, such as fluid transportation in the production process of precision chemicals, horizontal multistage pumps may be a better choice because they can provide more stable flow and pressure output.

3. Maintenance

Vertical multistage pump：

For vertical multistage pumps, since its motor is located above the pump body, it may be necessary to build a certain working platform when maintaining or overhauling the motor, which is relatively inconvenient to operate. Moreover, when repairing its internal impeller and other components, due to the compact structure of the pump body, the disassembly and installation process may be more complicated, especially in some installation environments with limited space.

Horizontal multistage pump：

Horizontal multistage pumps have certain advantages in maintenance. Its horizontally placed structure allows maintenance personnel to easily access various components. For example, when replacing seals or impellers, there is no need to consider the limitation of vertical space like vertical multistage pumps. The operation is more convenient, and the internal structure of the entire pump can be inspected and maintained more easily.

4. Performance characteristics

Vertical multistage pump：

Vertical multistage pump has certain advantages in lifting liquids, and it can produce higher head. This is because its vertical structure makes the flow path of the liquid in the pump body relatively more conducive to energy conversion, and efficiently converts the rotational energy of the motor into the potential energy of the liquid. It is suitable for occasions where liquids need to be transported to higher positions, such as the water supply system of high-rise buildings.

Horizontal multistage pump：

The flow range of horizontal multistage pumps is relatively wide, and it performs better when transporting large flow liquids. This is due to its internal structure design and horizontal placement, which allows the liquid to flow more smoothly in the pump body, reducing the flow loss caused by excessive flow resistance. It is often used in industrial production processes that require the transportation of large amounts of liquids, such as the transportation of raw materials in large chemical companies.

Finally, it is recommended to choose a manufacturer with reliable quality and perfect after-sales service. HUATAO GROUP has a strict quality control system and rich production experience in pumps, and can provide high-quality products. Moreover, the after-sales service network is relatively sound, and it can provide technical support and maintenance services in time when problems arise, reducing downtime and losses. And we can provide a variety of design solutions according to different working conditions: equipped with explosion-proof motors, constant voltage frequency conversion systems, and control cabinets.

Contact Person: Roberta Wong

Whatsapp:+86 133 8311 0325

Email:team4@huataogroup.com

Website:www.industry-pump.com