How to choose a high pressure multi stage water pump Which one to choose for a high pressure water p

One. First, select the flow rate, (including water supply, various desuperheating water) the sum of the above and then multiply by the affluence coefficient;

Two. Then there is the head selection:

1。the total resistance of the water supply pipeline, the water supply pipeline and valve from the economizer to the steam drum;

2。The maximum working pressure of the steam drum, that is, the internal pressure of the steam drum when the drum safety valve is activated, and the sum of the above pressures is multiplied by the double head affluence coefficient.

Three. Manufacturers should give priority to the selection of domestic manufacturers with good reputation, the feed pumps produced by these manufacturers are highly efficient, reliable in work, and then good after-sales service, spare parts, and reliable.

Summary. Find the difference between single-stage pump and multi-stage pump The difference between single-stage pump and multistage pump: 1. The maximum head of a single-stage pump is only 125 meters.

Multistage pumps, on the other hand, can achieve heads of more than 125 meters. In other words, below 125 meters, a single-stage pump can meet the requirements, but if the pumping height is above 125 meters, a multi-stage pump can only be selected. 2. The number of pump stages is different for single-stage pumps, and it is obvious that there is only one stage.

The multistage pump is based on the single-stage pump, and several are added. 3. The number of impellers is different, and the single-stage pump has only one impeller. Multistage pumps, on the other hand, have two or more impellers.

From this, we can also see that if we need to pump a liquid medium with a head of more than 125 meters, then both can meet the requirements. However, if the head is more than 125 meters, the only option is a multistage pump.

Find the difference between single-stage pump and multi-stage pump The difference between single-stage pump and multistage pump: 1. The maximum head is different, and the maximum head of single-stage pump is only 125 meters. Multistage pumps, on the other hand, can achieve heads of more than 125 meters.

In other words, below 125 meters, a single-stage pump can meet the requirements, but if the pumping height is above 125 meters, a multi-stage pump can only be selected. 2. The number of pump stages is different for single-stage pumps, and it is obvious that there is only one stage. The multi-stage Qingnian rubber pump has added several on the basis of the single-stage pump.

3. The number of impellers is different, and the single-stage pump has only one impeller. Multistage pumps, on the other hand, have two or more impellers. From this, we can also see that if we need to pump a liquid medium with a head of more than 125 meters, then both can meet the requirements.

However, if the head is above 125 meters, the only option is a multistage pump.

There is also a hail problem, the 50-meter-high cooling tower and pipeline pump are installed on the roof of the building, and the equipment that needs to be cooled is on the first floor.

If the water tank bucket is fierce to the residual energy of the pump, then the pipe resistance of the 11-meter DN150 pipeline is roughly 11m, and the residual energy of the cooling tower is not counted, and the pump head of 11 + 17 meters is acceptable The rated flow rate of 167 square meters of the air bridge still takes into account the residual energy, and the selection parameters are quite good!

Thank you! The floor height is 50m, plus the cooling tower is high, so that the head of the object is the most lacking and the low is 55m, how can the head be high as only 17 meters, I don't understand, please guide, thank you! 、

Answer: According to the meaning of the question, the 20-storey building is about 60 meters high according to the height of 3 meters per floor of the source mold, which requires 60 meters of head, if it does not count the head caused by the loss of pipeline head and well depth, the water reed crack level needs a minimum of 2 water pressure to 3 water pressures when it reaches the roof, that is, 20 30 meters of head, so that the selected pump head range is between 60 meters plus 20 meters and 30 meters, that is, 80 meters and 90 meters with the crack.

Single-stage means that there is only one impeller, which is generally a relatively small head and is used within 100 meters.

Multistage refers to the composition of two or more impellers, generally with a relatively high head, and is used above 100 meters.

In fact, the simplest difference between a multistage pump and a single-stage pump is that multiple impellers and one impeller can be summarized.

The so-called single-stage pump is a water pump with only one impeller in the pump body, so we can collectively call it a single-stage pump, which is characterized by a low lift, but the flow rate can reach thousands of cubic meters per hour, and the typical model is the ISG single-stage centrifugal pump.

The so-called multi-stage pump is a pump with multiple impellers in the pump body, the characteristics of this type of pump are large flow and high head, the flow rate can be thousands of square meters and the head can be thousands of meters, but the cost is not low, and the customer should choose according to the actual parameters.

Yes, referring to the number of impellers.

Generally, with the same head and flow, the power of multistage pump is lower than that of single-stage pump, which is to save electricity, and has high efficiency and long life.

Refers to the number of impellers, two or more impellers belong to the multistage pump.

Single-stage or multi-stage impellers.

In general, booster pumps use multi-stage impellers.

There are three major differences between a multistage pump and a single-stage pump.

I have seen that some multistage pumps and single-stage pumps can reach the same pressure, but when choosing, multistage pumps are still used, and on what basis do you choose to use multistage or single-stage? Or for some other reason? What is the difference between a single stage and a multi-stage?

Is it just the difference in the number of impellers?

1. Single-stage pump refers to a pump with only one impeller and a maximum head of only 125 meters;

2. Multistage pump refers to a pump with two or more impellers, which can absorb and press water in multiple stages in stages, so as to lift the water to a very high position, and the head can increase or decrease the number of stages of the pump impeller according to the need; In the case that the single-stage pump head needs to be equipped with a two-stage motor, the multi-stage pump can be equipped with a four-stage motor by increasing the number of impellers, so as to improve the service life of the pump and reduce the noise of the unit;

3. When the actual lift of the pump is less than 125 meters, the single-stage pump or multi-stage pump can be comprehensively considered according to the area of the pump room, the pump (the multi-stage pump is generally higher than the single-stage pump), and other factors.

I think the use of multi-stage is mainly due to economic considerations, which can be described in any fluid mechanics book. Single-stage and multi-stage is the difference between compression stage, a compression stage not only refers to the impeller but also the static vane holding ring, interstage sealing and so on.

According to the head level, choose a single-stage pump or a multi-stage pump, the efficiency of the multi-stage pump is lower than that of the single-stage pump, such as the single-stage pump and the multi-stage pump can also be used, the first choice of single-stage pump. If the single-stage pump can meet the needs, try to use the single-stage pump, the multi-stage pump structure is complex, there are many spare parts, the installation requirements are high, and the maintenance is very troublesome.

The multistage pump is the sum of the single-stage pump, and the head and outlet pressure can be very high.

The difference between one impeller and several impellers The difference between Yang Cheng Low and Yang Cheng Gao.

Hello, I am glad to answer for you: the difference between a single-stage pump and a multi-stage pump is as follows: 1. A single-stage pump refers to a pump with only one impeller; 2. Multistage pump refers to a pump with two or more impellers. Compared with the single-stage pump, the difference is that the multistage pump has more than two impellers, which can absorb and pressure water in multiple stages in stages, so as to lift the water to a very high position, and the head can increase or decrease the number of stages of the pump impeller according to the need.

The multistage pump is mainly used for mine drainage, urban and factory water supply, and is rarely used for agricultural irrigation, and is only suitable for lifting water in high mountains with high head and small flow to solve the difficulty of drinking water for people and animals.

Pre-flow pump industry provides: 45m cubic h Yangcheng 60m uses multi-stage stainless steel pump and pressure stabilizer tank, using 12 nozzles.

There are many parallel goods on the market, and the head engraved on the label does not match the reality, so it is necessary to pay attention to distinguish.

This plan is water-consuming, and the effect may not be good, so give up.

According to the requirement that the spray height of the water curtain should not be less than 7-8 meters, the water output speed of the nozzle should be guaranteed to be not less than 15m s.

Assuming that the nozzle is a round nozzle with an inner diameter of 10mm (no matter how large it is, it will be too wasteful of water), the flow rate of each nozzle is approximate.

The number of nozzles was set to 15, and the total flow rate was 65 m3 h.

Main pipe diameter (inner diameter): 80 100, i.e. 3 4 inch water coal pipe.

Total head of the pump: h 40m.

According to the above requirements, you can choose an ordinary centrifugal pump, which requires: flow rate Q60 80m3 h, head 40 50m.

There are many centrifugal pumps that meet this requirement, and they are available from the market.

Due to the different manufacturers, the models are different, and the following models are for reference:

Model: ISW80 200, flow, head, power kW, speed 2900

Multistage centrifugal pump:

b: Single-stage single-suction cantilever centrifugal pump.

d: Segmental multistage pump.

dg: Segmental multistage boiler feed pump.

DL: Vertical shaft multistage pump.

DS: Segmental multistage pump with double-suction impeller for the first stage.

KD: Split Chambers Multistage Pumps.

KDS: Split split multistage pump with double-suction impeller for the first stage.

QDLF: Stainless steel multistage centrifugal pump.

GC: Boiler feedwater centrifugal pump.

DL: Vertical multistage centrifugal pump.

GDL: Multistage pipeline centrifugal pump.

TSWA: Horizontal multistage centrifugal pump.

LG: Multistage centrifugal pump for water supply in high-rise buildings.

CDLF: Stainless steel vertical multistage centrifugal pump.

D: Multistage centrifugal pump.

There are two common types of multistage pumps: vertical multistage pumps and horizontal multistage pumps.

According to the different materials and different functions of each pump, it can be divided into D-type multistage pump, DG type multistage pump and DM type multistage pump and so on.