How to choose a water pump? How to choose a pump model and specifications

1) Selection of water pump. According to the design flow rate and design head, use the pump type spectrum or pump performance table to select the pump (the flow rate and head must match), and then check according to the configured pipeline system, if the pump is not running in the high-efficiency area, it should be re-selected.

2) The use of water pumps. If the geographical environment permits, the pump should be installed as close to the water source as possible to reduce the length of the suction pipe. The foundation of the water pump installation place should be firm, the water inlet pipeline should be sealed and reliable, there must be special support, and the water inlet pipe equipped with the bottom valve should be installed vertically with the horizontal plane as far as possible, and the angle between the axis and the horizontal plane shall not be less than 45°.

When the water source is a channel, the bottom valve should be more than one meter higher than the bottom of the water, and the net should be added to prevent debris from entering the pump. The base of the machine and pump should be horizontal, and the connection with the foundation should be firm. When the belt of the machine and pump is driven, the tight edge of the belt is below, so that the transmission efficiency is high, and the steering of the impeller of the water pump should be consistent with the direction indicated by the arrow; When the coupling is used, the machine and pump must be coaxial.

3) Inspection of the water pump. The pump shaft should rotate flexibly without impact sound; There is no obvious shaking of the shaft diameter of the pump, and enough calcium-based lubricating oil is added. Mainly check whether the water inlet pipe is damaged, and repair the cracks in time; Check whether each fastening bolt is loose and tighten the loose bolt.

The motor winding and electrical insulation of the submersible pump should meet the requirements before it can be used.

4) Operation of the water pump. During the operation of the water pump, it is necessary to pay attention to check the vacuum gauge and pressure gauge at any time, monitor and record the working condition of the water pump, listen to whether there is any abnormal noise, whether the temperature at the bearing is too high, whether the stuffing box drips too much or too little, and also check whether the pump speed and belt tightness are normal.

5) Shutdown of the water pump. The submersible pump must be buried in the water to work, once exposed to the water surface, it should be immediately powered off and stop running, otherwise there is a risk of burning. When the high-lift pump is stopped, it should be forbidden to interrupt the power suddenly, otherwise it is easy to cause water hammer and damage the pump or pipeline; For the water conveyance system equipped with gate valves, the gate valve should be closed slowly when it is shut down, and then the machine should be stopped; For pumping units powered by diesel engines, they should also be shut down after gradually reducing oil.

When the pump is shut down in winter, the water in the pump should be cleaned to prevent rust or freeze cracking; In the event of a long-term shutdown, the parts should be disassembled, dried, inspected and repaired, then assembled and stored in a dry place.

Selection of water pumps,:

1. According to the needs of production, the requirements of flow and head (or pressure) in the production process must be fully met.

2. Select the pump type with good performance and strong adaptability and guarantee with the flow rate and head changes required by the project. First of all, in the series of products that have been finalized, the pump with high efficiency, good suction performance and wide range of use should be selected. When there are a variety of pump types to choose from, a technical and economic analysis should be carried out to select the best one.

When the series of products can not meet the selection requirements, the new products can be designed and trial-produced according to the prescribed procedures. When the head required by the project changes greatly, it is advisable to choose the pump with a steep drop in H-Q curve; When the flow rate of the project changes greatly, it is advisable to choose a pump with a flat H-Q curve.

3. The selected pump should be operated as far as possible within its high-efficiency area, that is, near the design (rated) working condition point. Under the design standards, the pump unit can operate normally and safely, that is, there is no cavitation, vibration and overload.

4. The average device efficiency of the selected pump is high in long-term operation, the energy consumption is low, and the operating cost is low.

5. The model and number of selected pumps make the investment of the whole system (the total investment of equipment cost and civil engineering and installation engineering) the most economical.

6. Easy to construct, easy to run, manage and maintain.

7. For cascade pumps, the pump model and number should meet the flow coordination requirements between the upper and lower pumps, and try to avoid and reduce the insufficient flow or excessive flow of the lower pumps caused by improper flow coordination.

8. For large axial flow pumps and mixed-flow pumps, there should be device model test data; When the prototype makes major changes, the device model test should be re-conducted.

9. In the selection of pumps for agricultural drainage and irrigation projects, the requirements of comprehensive water conservancy development should be taken into account as much as possible.

First of all, look at the pipeline of the pump you need, and the general pump selection is to print the caliber of your own pipeline! Then there is the flow rate, each manufacturer's pump flow system is different, according to the flow rate to choose their own suitable pump. Then it is the material selection of the pump, and it is necessary to understand what material is suitable for conveying the liquid to be conveyed.

Finally, there are the details, such as whether there are particles in the conveyed liquid, etc.!

The steps of pump selection are as follows:

1. Determine the type of pump and motor according to the use.

2. Determine the head and flow rate of the pump according to the water source and use occasions.

3. Select the motor power according to the head, flow rate and efficiency of the pump.

Classification of pump selection.

1. According to the working principle and structure of the pump: vane pump, positive displacement pump (and other types of pumps), such as: jet pump, air lifting pump, electromagnetic pump, rotary vane vacuum pump, water ring vacuum pump, etc.

There are two types of positive displacement pumps: reciprocating pumps and rotary lobe pumps.

Reciprocating pumps: electric pumps, steam pumps.

Electric pumps: piston (piston) pumps, diaphragm pumps, metering pumps.

Rotary lobe pumps: gear pumps, screw pumps, roots pumps, sliding vane pumps, etc.

2. According to the medium: clean water pump, sewage (dirt) pump, oil drum pump, corrosion-resistant pump, diaphragm pump, magnetic pump, sewage pump, centrifugal pump, screw pump, oil pump, etc.;

After determining the design flow rate and design head of the pumping station, you can use the relevant technical charts to determine the pump model and specifications, and its method.

First, the use of pump performance specifications table to select the pump type pump factory in the product catalog are provided with this kind of **, the performance of each model in the table has three lines of data, which line shall prevail in the general design flow and design head should be consistent with the value of the middle line listed in the performance table, or close, and must fall in the upper and lower two lines of the range, because this range is the high-efficiency area of the pump operation, this model of the pump is considered to meet the actual needs, the pump is selected.

Use the pump selection table to select the pump type.

According to the determined design head and design flow, in the selection table, the head of the cross gauge finds out the head value that is consistent with or close to the design head; Then find out the flow value that is consistent with the design flow rate or close to the longitudinal gauge head, intersect in the small square vertically and horizontally, it marks the model of the water pump, and preliminarily selects the pump type. However, sometimes both pump types meet the design requirements, at this time, the two pump types can be compared, technical and economic analysis can be carried out and one of the suitable pump types can be selected. This method of selecting a water pump is relatively simple and fast.

Third, the use of pump performance comprehensive spectrum selection pump type centrifugal pump, axial flow pump, mixed-flow pump, slurry pump working area all comprehensive on the same map, which constitutes the agricultural water pump series comprehensive spectrum, the drawing is more complicated, but the use is more convenient. According to the determined design flow rate and design head, on the pattern spectrum, first find out several pumps that meet the requirements of the head and the flow rate is unequal by the design head on the ordinate, and then determine which kind of pump is selected by the design flow rate on the abscissa. If the design flow rate is large, the single pump fails to meet the requirements, multi-machine operation can be considered, but attention should be paid to the use of the same type of pump as much as possible, so as to facilitate construction, installation, management and maintenance.

Water pump series: diaphragm pump, magnetic pump, sewage pump, centrifugal pump, screw pump, oil pump, refueling pump, gear pump, oil drum pump, hand pump, vortex pump, multistage pump, chemical pump, clean water pump, stainless steel pump, FRP pump, plastic pump, reciprocating pump, submersible pump, deep well pump, submersible pump, self-priming pump, metering pump, high temperature pump.

Mechanical seal vacuum pump series: rotary vane vacuum pump water ring vacuum pump.

A water pump is a machine that transports liquids, and no matter what type of water pump it is, it is still impossible to leave the liquid in the end. The water pump can only work if there is liquid. So, when we choose to use a water pump, what criteria should we use to choose the right pump for ourselves?

How to choose a water pump? Performance is one of the key factors in choosing a water pump.

Generally speaking, water pumps can be classified by industry, principle, use, performance, etc. For example, according to the performance classification, there are explosion-proof pumps, wear-resistant pumps, corrosion-resistant pumps, leak-free pumps, sanitary pumps, automatic pumps, and frequency conversion pumps. The pump industry is a very broad industry, mainly due to the diversity of products.

Most manufacturers will design relevant pumps according to their own expertise.

How to choose a water pump? The material is the key to choosing a water pump.

Years of experience in the industry have taught us that the basic requirements for a successful pump unit are performance and longevity. Performance is all about the pump's parameters: head, flow and efficiency.

Life is the total number of operating hours before one or more parts must be replaced while maintaining the permissible performance. It is mainly a measure of the resistance of a structural material to corrosion, erosion, or a combination of these two under actual operating conditions. Many companies use stainless steel for their own water pump products, which usually refers to iron-based corrosion-resistant alloys with a chromium content of 12 to 30%.

Stainless steel has the effect of corrosion resistance.

How to choose a water pump? Model and specification are the key three in choosing a water pump.

The pump model represents the structural characteristics, working performance and the nature of the medium to be conveyed. Due to the wide variety of water pumps, the specifications are different. Customers should make a professional choice according to the needs of their own enterprises.

Generally speaking, when the enterprise starts the plant design, the relevant designers will take this into account for you, if it is a reorganized enterprise, you can ask the professional engineers of the senior pump old enterprise to carefully select for you.

The pump model should be based on the specific flow head of your working conditions, find a good manufacturer, they will choose according to your needs, the pump can be found in Shanghai Sunshine Pump Industry, they are the top ten brands in China, the cost performance is high, the industry is used in their home.

Depending on what medium is being conveyed, how much flow and head is required, you can choose the corresponding water pump.

The choice of the model of the pump depends on your needs, if you need a pump with a large displacement, try to buy a pump with a large displacement and high efficiency, I am a pump purchased here in the sunshine pump industry, they have more models of pumps here, and the service provided by the manufacturer is also very good.

Choosing the model and specifications of the pump is actually very simple, I am not very professional in this area, but when I went to the sunshine pump industry to buy, they helped me choose the model according to my needs, the service is very good, I bought the model I wanted here, the pump of this manufacturer is not expensive, it is a good choice to buy a pump from them.

Try to choose a lower speed specification for the water pump, you can take a look at the sunshine pump industry, ** cheaper, good mute effect.

How to choose a water pump.

First, the basic data of the pump selection is listed:

1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.

2. The diameter and content of the solid particles contained in the medium.

3. Medium temperature: (

4. The required flow rate of general industrial pumps in the process flow.

, you can ignore the amount of leakage in the piping system, but you must consider the effect on the flow rate when the process changes. If the agricultural pump is used to transport water through open channels, leakage and evaporation must also be considered.

5. Pressure: suction pool pressure, drainage pool pressure, pressure drop (head loss) in the pipeline system.

6. Pipeline system data (pipe diameter, length, type and number of pipeline accessories, geometric elevation from suction tank to pressurized water tank, etc.).

7. The material and sealing form of the pump.

8. Select the appropriate range and structure of the pump according to the flow rate and head.

9. Select the form of the pump (vertical, horizontal, transmission form) according to the installation site 10. Select the driving power according to the power source.

11. Select the structure of the pump according to the use (clean water pump, sewage pump, etc.) 2. Determine the flow head and flow rate of the pump selection

1. If the minimum, normal and maximum flow rate has been given in the production process, it should be considered according to the maximum flow rate.

2. If only the normal flow rate is given in the production process, a certain margin should be considered. For NS>100 high-flow low-head pumps, the flow margin is 5%, for NS<50 small-flow high-head pumps, the flow margin is 10%, for 50 NS100 pumps, the flow margin is also 5%, and for the pumps with poor quality and poor operating conditions, the flow margin should be 10%.

3. If the basic data is only given by weight, it should be converted into volumetric flow.

Pump selection is a very important step, improper selection may lead to the pump not working properly or shorten the life of the pump. Here are some basic principles and steps for pump selection:

Determine the demand: First of all, it is necessary to clarify what needs to be met by the pump, such as the transmission flow, head, medium type, use environment, etc.

Determine the parameters: determine the parameters of the pump according to the requirements, such as flow, head, motor power, material, size, etc.

Select the type of pump: Choose the right type of pump according to your needs and parameters, such as centrifugal pumps, piston pumps, diaphragm pumps, etc.

Determine the model of the pump: After determining the type of pump, choose the appropriate pump model according to the specific parameters and requirements, and consider factors such as performance, quality, etc.

Select accessories: Choose accessories according to your needs, such as motors, pipelines, valves, etc.

Check the selection results: Finally, you need to check and check the selection results to ensure that the selection results meet the requirements.

In general, there are many factors that need to be considered in the selection of a water pump, and the selection needs to be made on a case-by-case basis. Choosing the right pump can ensure the normal operation and long life of the pump, and reduce the cost of repair and replacement.