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  • Multistage Submersible Water Pump
Multistage Submersible Water Pump

Multistage Submersible Water Pump

  • Product description:Our multistage submersible pump has the advantages of advanced structure, vertical and horizontal dual use, long life, reliable operation and low noise. It has a higher head than the traditional single-stage centrifugal submersible pump.
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Multistage Submersible Pump Details

Multistage Submersible Pump is a pump containing 2 or more impellers. These impellers can be of the same or different types, namely suction impeller, double suction impeller or a combination with centrifugal first stage and side channel stage impeller. It is used in field applications that require a higher head than traditional single-stage centrifugal submersible pumps. These centrifugal pumps have been proven in field applications and have been developed for many years.

Working principle of multi-stage submersible pump

The multistage submersible pump passes through one impeller to the next impeller. The number of impellers required depends on the discharge pressure requirements. The liquid enters the pump and then passes through different numbers of impellers from the inlet to the outlet.
The components of a multi-stage submersible pump are very similar to those of a standard centrifugal pump, but the additional component of a multistage centrifugal pump is a diffuser, which can effectively guide fluid to the eye of the impeller or the next stage. In the side channel pump, there is an intermediate plate with a fan-shaped side channel and a liquid part.

In a multi-stage centrifugal pump, because the impeller produces larger thrust in the same direction, there will be a thrust balancing device, that is, a balance disc or a balance drum, to reduce the thrust to a standard controllable level. The size of the thrust bearing.

The impact of impeller on multi-stage pumps and single-stage pumps

1. The effect of stress

The pressure bearing capacity of the multi-stage pump design is much higher than the pressure bearing capacity of a single impeller alone. This is because the multiple impellers of the multistage centrifugal pump are all mounted on the same shaft and rotate on the same shaft, essentially like independent pumps.
When the pressure requirement exceeds the capacity of a single-stage pump, multistage submersible pump is usually selected. The single-stage centrifugal pump has a higher flow rate and is suitable for installation under lower pressure conditions.

2. The effect of efficiency

Multistage Submersible Pump can use smaller motor size and less energy to obtain higher performance.
Since a multi-stage pump relies on multiple impellers to transfer energy to the fluid being transported, the diameter of each impeller can be smaller than that of a single-stage pump, and it can operate with a smaller gap between the impeller and the volute. Therefore, These small tolerances mean that each impeller can operate with optimal hydraulic efficiency.

Multistage Submersible Pump parameters

Double suction pump

61,67,68
D: 125-350mm
Q: 10-1800m3/h
H: 12-1145m

Single suction submersible pump

65,66
D:65-200mm
Q: 10-440m3/h

H: 12-355m

What is the difference between a single-stage pump and a multi-stage pump?

1. Single-stage pumps use one impeller, while multi-stage pumps use 2 or more impellers.
2. There are additional components in the multi-stage pump, which need to guide the fluid from the first stage to the latter stage, namely the diffuser.
3. The multi-stage pump has a thrust balance device, and may also have intermediate bearings (lubricated by the pumped material) to stabilize the shaft and other nuances.

Multistage Submersible Pump application

Multistage Submersible Pumps cannot handle solids and abrasives, because the gap between the impeller and the pump volute is very small, so they are usually used for water and other low-viscosity fluids.
The series submersible pumps are multi-stage vertical and horizontal dual-purpose centrifugal pumps manufactured on the basis of the introduction of German Ritz technology. They have the characteristics of advanced structure, high unit efficiency, and excellent materials. , Vertical and horizontal dual-purpose, long life, reliable operation, low noise and other advantages. This pump is an upgraded product of the QJ series that originally implemented the standards of the Ministry of Agriculture. This series of pumps are mainly used for permanent drainage of coal mines, surface drainage and high-pressure jet grouting projects. They are also suitable for deep well pumping in the mining industry and urban and rural areas. Ritz series multi-stage submersible pumps are mainly composed of motors and pumps, which can meet vertical and horizontal use. The matching motor has a large shaft diameter and short shaft length.

Popular areas of Multi-stage Submersible Water Pump

Boiler feed, reverse osmosis, water pressurization, irrigation, fire protection, heating/cooling regulation, water circulation.
Our customers who purchase multistage submersible pump are more willing to apply to mound systems, drip irrigation systems and recirculating media filters.
Permanent drainage of coal mines, surface drainage and high-pressure jet grouting projects, as well as deep well pumping in the mining industry and urban and rural areas.
Water supply to high-rise buildings, reverse osmosis, boiler water supply, spraying, high-pressure cleaning, water plants, heating, condensation, fuel delivery, oil and natural gas production, power generation and mining, and other high-pressure and high-temperature applications.

Features of multi-stage submersible pumps

If we compare the centrifugal multistage pump with the high pressure pump, although the centrifugal multistage pump is more complicated and more expensive, the multistage submersible pump has better hydraulic coordination, higher efficiency and more reliable performance. With its hydraulic module, the ability to provide additional impellers, and the ability to trim these impellers, I can fully satisfy the working point without compromise.
If multiple working points are required, multistage submersible pump can be configured with inter-stage discharge. Compared to a single-stage centrifugal pump, a multi-stage pump may run at a lower speed, which may provide efficiency advantages, but it will definitely run quieter, which is an important consideration in today's world.

Advantages of multistage submersible pumps

1. Compact structure
2. The pump is coaxial with the motor
3. Single suction multi-stage
4. Sand-proof seal
5. Strong reliability
6. High efficiency and energy saving
7. Small size, easy to transport and install
8. Low cost

The difference between vertical multistage pump and horizontal multistage pump

The vertical multi-stage pump is located above the ground and can be used in places with limited space, but the motor needs to be removed before maintenance.
Vertical multi-stage submersible pumps are used in certain applications where the motor needs to be lifted from the oil tank to maintain the equipment. Vertical pumps usually bear thrust loads by motors to eliminate the need for thrust bearings in centrifugal pumps, thereby reducing complexity and cost.
Horizontal multi-stage submersible pumps are equipped with feet. For high temperature applications, the feet are specifically designed to allow thermal growth to avoid operational problems caused by expansion and contraction. They need to be aligned with the motor. On a vertical pump, the installation may be simpler, that is, for the sewage pump, the support plate will be fixed with standard bolts, and usually does not need to be centered, because the motor is flanged, and it will automatically align with the corresponding centering regulator.
The most common types of multistage submersible pumps in the industry are horizontal multistage pumps and vertical multistage pump centrifugal pumps. Multi-stage side channel pumps and vertical turbo pumps are also common.

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