"multistage" - Knowledge Search

Brief introduction of vertical multistage pump

The key to the installation of the multistage pump is how to correctly determine the pump installation height (ie suction stroke). For a general centrifugal pump, this height refers to the vertical distance from the liquid level to the center line of the pump impeller; for large-flow centrifugal pumps, this height should be considered according to the distance between the highest point of the impeller population and the liquid level.   It can not be confused with the allowable vacuum. The...

Causes of overheating of multistage pump bearings

Causes of overheating of multistage pump bearings 1. The multi-stage pump shaft and the motor shaft are out of size when installing or inspecting, causing the bearing to overheat due to vibration. 2. The bearing is damaged, the rotating parts wear and cause vibration to make the bearing overheat. 3. The filler ages, scratching the bushing and generating overheating affects the bearing. 4. Bearing grease lubricant does not match. Too much or too much will cause the bearing to overheat. 5. Be...

Self-balancing multistage pump's performance curves

The performance parameters of the self-balancing multistage pump are such as a certain relationship between the flow rate Q head H axis power N speed n efficiency η. The relationship between the magnitude changes between them is represented by a curve, which is called the performance curve of the pump. The mutual relationship between the performance parameters of the self-balancing multistage pump and the mutual constraints: First, the rated speed of the self-balancing multistage pump is pre...

Multistage pump mechanical seal's precautions and maintenance

1. The multistage pump should first drive the pump motor several times before starting to avoid the graphite ring breakage caused by sudden movement; 2. Seal leakage tolerance 3 drops / MIN, otherwise it should be overhauled; 3. Mechanical seal lubrication should be cleaned without solid particles; 4. It is strictly forbidden to work mechanical seals under dry grinding conditions. Three major maintenance points for multistage pumps in operation: 1. The inlet pipe must be filled with liquid,...

Multistage pump selection for piping system data

For the piping system data in the multistage pump selection step, the device characteristic curve should also be made if necessary. When designing and arranging multi-stage pump piping, pump manufacturers should pay attention to the following items: A. Reasonably select the diameter of the pipeline, the diameter of the pipeline is large. Under the same flow rate, the flow velocity is small, the resistance loss is small, but the price is large, and the diameter of the pipeline is small, which wi...

How to maintain a multistage pump

(1) Check the multistage pump piping and joints for looseness. Turn the multistage pump by hand to see if the multistage pump is flexible. (2) Add bearing lubrication oil to the bearing body, observe that the oil level should be at the center line of the oil mark, and the lubricating oil should be replaced or supplemented in time. (3) Unscrew the water diversion screw plug of the multistage pump pump body and infuse the water diversion (or the slurry). (4) Close the gate valve and outlet pres...

Multistage centrifugal pump's common irregular operation

Large-diameter multistage centrifugal pump with small water pumping. Many people think that this can improve the actual lift, in fact, the actual lift of the pump = total lift - loss head. When the pump model is determined, the total lift is certain; the loss head is mainly from the pipeline resistance. The smaller the diameter, the greater the resistance, so the larger the lift head is. Therefore, after the pipe diameter is reduced, the actual lift of the pump can not be increased. On the cont...

Reasons for insufficient flow of multistage pumps

The reasons for the insufficient flow of the multistage pump are as follows: 1. The bottom valve is too small: change the suitable pump bottom valve 2. The depth of the suction pipe is not enough. There is an air suction pump: increase the immersion depth of the suction pipe 3. The suction line is too thin or blockage of debris: change the appropriate pipeline to remove debris 4. The impeller is severely worn or severely corroded: new impeller 5. The seal ring is severely worn or corr...

Multistage centrifugal pump Q&A

1. How is the first stage impeller of a multistage centrifugal pump centered with the vane? Answer: (1) Put the first stage impeller on the shaft and push it into position, and turn the rotor to the position opposite to the first stage impeller. At this time, the impeller front cover and the inlet guide vane joint remain. The guide vane covers the same gap. (2) Marking on the shaft based on the end face of the tile, and then assembling. After assembly, the alignment of the first stage impelle...

Multistage centrifugal pump control valve function

1. Structure The main feature of the multistage pump control valve structure is that the positioning mechanism in the middle of the valve seat and the spring on the upper side of the valve disc are eliminated, and the deflector is designed on the lower side of the valve flap to minimize the mechanical loss of the medium overcurrent. And the vortex loss in the lower sac cavity of the valve flap. The piston in the cylinder is used as a driving component to drive the valve flap up and down under t...

Multistage pump-regarding pipeline data system

For the piping system data in the multistage pump selection step, the device characteristic curve should also be made if necessary. When designing and arranging multi-stage pump piping, pump manufacturers should pay attention to the following items: A. Reasonably select the diameter of the pipeline, the diameter of the pipeline is large. Under the same flow rate, the flow velocity is small, the resistance loss is small, but the price is large, and the diameter of the pipeline is small, which wi...

Multistage pump flow control adjustment method

The multi-stage pump flow control adjustment method has three methods of adjusting the plunger or piston stroke, adjusting stroke and pump speed, and the method of adjusting the stroke is the most widely used. The method of change is simple and reliable. There are three types of stroke adjustment methods: 1. Manual adjustment when parking: manually adjust the stroke of the multi-stage pump when parking. 2. Manual adjustment during operation: change the axial displacement during pump operation...

Multistage mining pump requirements for power supply

For the knowledge of mining multi-stage pumps, I believe that everyone has a certain understanding, in order to have better use of it, it should understand the requirements of the power supply, the following is a detailed introduction for everyone: 1. The rated power supply voltage of the mine multi-stage pump is 380V±5%, the frequency is 50Hz±1%, and the rated voltage of the motor terminal should be within the allowable deviation range of the rated voltage. 2. The load power of ...

Why multistage centrifugal pumps can't lift water?

The multi-stage centrifugal pump has become the most widely used type of water pump in agriculture because of its simple structure, convenient use and maintenance, and high efficiency. However, it is also troublesome because it is sometimes not lifted. Now I will analyze the reasons for the failure to mention water as below:   Air in the inlet pipe and pump body (1) Some users are not filled with enough water before the pump starts; sometimes it seems that the water has overflowed from t...

Self-balancing multistage pump guide vanes

Self-balancing multi-stage pump guide vanes The function of the self-balancing multi-stage pump guide vanes is to convert the kinetic energy transmitted by the impeller to the liquid into pressure energy. It does not generate a lift, so it should minimize the hydraulic loss. The vanes designed according to the constant velocity method are the best. Only the kinetic energy in the diffuser behind the throat of the vane can be converted into pressure energy. The pump efficiency is highest when usin...

Multistage pump debugging and calibration method

Multistage pump elevation adjustment and initial level 1) Elevation adjustment The relative height difference (positive or negative value) between the measurement site and the elevation reference point (commonly known as zero) is called the elevation at that location. The elevation is divided into absolute elevation and relative elevation. The absolute elevation is the sea level as the reference zero point, the height difference from the sea level is called the absolute elevation; the relative ...

Multistage centrifugal pump's operation and management

Before starting the pump When the transported high-temperature liquid suddenly enters the pump body of the multistage centrifugal pump, the temperature of the pump body changes greatly, and the pump body and the rotor component are deformed due to uneven heating and thermal deformation, and the wear-resistant parts are interposed. There is only a small gap in itself that leads to abnormal contact. If the multistage pump is started in this case, it will cause vibration, bite, and shaft ...

Boiler feed water multistage pump operation tips

Boiler feed water multistage pump operation tips Boiler feed water multistage pump operation attention rules (1), pay attention to the timely replacement and supplement of boiler feed water multi-stage pump lubricant. 1. Lubricating oil will inevitably deteriorate during the working process of boiler feed water multi-stage pump, resulting in poor lubrication performance. It should be cleaned regularly and replaced. 2. Pay attention to whether the oil level of the boiler feed water multi-stage...

Multistage Centrifugal Pump Assembly and Disassembly

Disassembly Precautions for multistage centrifugal pump: 1. Stopping pump in order. 2. Discharging of the liquid (including cooling water) in pump casing, the lubricating oil also should be let out. 3. Removing the relevant pipes. 4. The manufacture precision of parts should be protected when disassembling, to avoid to damage the pump shaft, middle stage should be underlay when disassemble the pull rod. Multistage centrifugal pump Assembly: The steps of assembly are on the contrary to disa...

Multistage centrifugal pump flow control adjustment method

The multistage centrifugal pump flow control adjustment method has three methods of adjusting the plunger or piston stroke, adjusting stroke and pump speed, and the method of adjusting the stroke is the most widely used. The method of change is simple and reliable. There are three types of stroke adjustment methods: 1. Manual adjustment when parking: manually adjust the stroke of the multi-stage pump when parking. 2. Manual adjustment during operation: change the axial displacement during pum...

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