Submersible Pumps

Submersible pumps design to install in areas containing deep submersible fluids. Can be submerged and completely sucked under mud, wells, tanks, tanks, or the application’s environment to treat,… The pump has two versions: single-stage and multi-stage (multi-stage is the most popular version. ).

What is a submersible pump?

Submersible pumps, as the name suggests, are built to be completely submerged in water. It is a centrifugal water pump, which means it has an electric motor that powers an impeller designed to rotate and push the water out. The engine is housed in a waterproof housing and is watertight connected to the pump body to which it provides rotational kinetic energy.

Submersible pumps
Submersible pumps

The nature of this pump line is to submerge in the fluid, so they are capable of self-priming without any other action.

Do you notice a difference compared to the centrifugal pumps placed dry? It is the pump body that does not have aluminum impellers for the pump motor. Because when submerged deep in water, the smooth body will not hinder the flow of fluid. On the other hand, this design also helps the pump cool better thanks to the pump fluid flow.

Structure of submersible pump

Submersible pumps design to be able to be placed deep in the water tank to be pumped out. Therefore, they are often used to drain water during floods, pump sewage, drain water in ponds, or even pond filters. You know, the type of filter pump placed inside your aquarium is also a submersible pump. In water tanks, submersible pumps are placed inside the tank to pump water to where it is needed.

So what’s the difference between a submersible pump and a conventional centrifugal pump?

Construction of submersible pump
Construction of submersible pump

⇒ The main difference here is that the submersible pump is entirely watertight. The essential components are the same as other centrifugal pumps, including:

    • Power cord
    • Drive motor provides kinetic energy for the impeller to operate
    • Pump shaft
    • Pump chamber
    • Single-stage or multistage centrifugal pump
    • Watertight case
    • Suction port right at the pump body
    • It can connect the discharge port to an extension hose
    • With waterproof accessories such as seals, pump seals, o-rings, screws,…

Working principle of submersible pump

The working principle of a submersible pump is straightforward; we can describe this principle in the following steps:

    • Submersible pumps start by converting the rotational energy the motor generates into kinetic energy in the impeller. In this way, they create pressure and pull the fluid into the pump chamber.
    • As the fluid enters the pump chamber, it passes through the inlet and then is pushed through the rotation of the impeller and into the diffuser at high pressure.
    • After this point, it will push the fluid to the surface, which it can use appropriately through the pump discharge.
    • This operation repeats continuously until the submersible pump disconnect from the power supply. We do not need to prime the fluid for subsequent operations.
Principle of submersible pump
Principle of submersible pump

The picture depicts the operation of a submersible water pump for domestic use, with the ability to operate automatically through the control signal to switch off the source from the contact of the float, indicating full of dry alarm. When the float is at a low water level, it will disconnect the pump from the power supply. Until the float rises to the same level as the water pipe into the lake to the whole point, the submersible pump will automatically turn on and start pumping fluid through the tube.

Types of submersible pumps

It is complicated to classify submersible pumps because, in principle, they are entirely similar to each other. But according to the application, there will be many types of submersible pumps listed. But Thai Khuong temporarily spends two most popular submersible pumps for everyone to grasp:

    • Submersible pumps suspend in a water or oil well (also known as a good pump, oil well pump, etc.). Well pumps powered by AC voltage (alternating current) are used in agriculture for irrigation and domestic use, industrial production, sewage suction,… DC voltage (direct current) use on smaller pumps for low water flow (most commonly found in aquariums, aquariums) or mini submersible pumps.
    • The second type of submersible pump is the tank suction pump. Tank pumps are used in pits or tanks and sometimes just a low area like a fountain,… Tank pumps usually consist of a clean water pump, a sewage pump, a submersible slurry pump,… Tank pumps use in the field of fire prevention.

In addition, it is possible to name and classify submersible pumps by application such as:

    • Well submersible pump
    • Mini submersible pump
    • Aquarium submersible pump
    • Sewage submersible pump
    • High thrust submersible pump
    • Submersible slurry pump
    • Household submersible pump

Or classified by capacity:

    • Large capacity submersible pump
    • 1hp submersible pump
    • 1.5hp submersible pump
    • 2hp submersible pump
    • 3hp submersible pump…

Classified by voltage class as:

    • 12v submersible pump
    • 24v submersible pump
    • 220v mini submersible pump
    • 3 phase submersible pump…

Advantages of submersible pumps

When we know the advantages of a submersible pump (sump pump), we can easily calculate the parameters and the pump’s appropriate operating conditions for your existing system. And here, Thai Khuong presents the outstanding advantages of this submersible pump line. Thai Khuong would like to take advantage of Caprari submersible pump line, a famous centrifugal pump brand from Italy. The benefits are as follows:

    • They work very efficiently and consume low energy
    • Optional on the number of impeller stages, cost optimization
    • Quiet operation due to being submerged underwater
    • Unaffected by cavitation or pressure spikes
    • Self-priming and doesn’t require a lot of energy to suck up liquid

However, submersible pumps also have some disadvantages such as:

    • The seals corrode over time, especially in the wastewater environment where chemicals are present
    • Because it is a submersible pump in the pumped medium, it is more challenging to access fault detection and maintenance
    • It takes up a certain amount of space inside the tank
    • Cheap pump lines may exist the risk of leaking electrical connections, causing danger
    • The impeller can be stuck due to the medium containing suspended solids, the plaque drifting along with the water flow…

Therefore, we also need a regular maintenance plan for submersible pumps, replacing damaged parts when necessary, and knowing how to use the submersible pump properly.

Caprari submersible pump
Caprari submersible pump

Note when choosing a submersible pump

There are many specifications to evaluate when choosing a submersible pump. Choosing the right pump is paramount in optimizing system efficiency. We can summarize the process of selecting a submersible pump through the following steps:

    • First and foremost, submersible pumps are selected based on pump type and application.
    • Next, it must determine the maximum discharge flow.
    • The head uses to determine the maximum flow rate of the submersible pump. In that case, it is necessary to consider the maximum discharge pressure of the pump. It refers to the total amount of pressure the pump can handle.

In addition, we also need to pay attention to the capacity of the submersible pump. The discharge port, the discharge pipe of the submersible pump also needs to be carefully calculated.

Install submersible pump

As we all know, the submersible pump’s feature is that the pump can be wholly submerged in water. The motor is sealed and fastened to the pump body. Therefore, the installation and use of the pump are also quite simple.

Thai Khuong would like to introduce some basic steps to install a submersible sewage pump. After you have consulted to choose the right submersible pump line such as:

    • Determine the installation location
    • Calculate the depth by testing the suction of the machine to optimize the position of the pump’s anchorage
    • Extension of the mains power line
    • Check the pump float
    • Test operation

Some submersible pumps can easily handle solids, while some are only suitable for liquids. Submersible pumps are quiet because they’re underwater and unique design, so cavitation is never a problem because there’s no “spike” in pressure as water flows through the pump.

It is important to note that they must be completely submerged in the liquid when installing submersible pumps. Do not let the submersible pump run dry, even for a short time, because that can cause severe damage to your submersible pump.

Using submersible pumps in agriculture
Using submersible pumps in agriculture

How to use a submersible pump

Submersible pumps use in many places, in many situations. For example, The simplest is to pump water from an underground reservoir under the floor or from the bottom of the tank. Submersible pumps can also transfer wastewater, pump solids to the ground with compact size. There are submersible irrigation pumps, sand pump submersible pumps, sewage submersible pumps, solar submersible pumps, 12V submersible pumps,…

Since the pump is submersible, there is only a critical note on how to use the submersible pump:

“It would be a nightmare for a submersible pump user to run the pump without water. Therefore, you are not allowed to run the submersible pump for more than a few seconds without water. If you do, the consequences will be.” The pump’s impellers will immediately start to heat and flow out as soon as the water level is completely dry. Running without water can also lead to the pump being shaft locked or severely damaged. Remember, do not leave your submersible pump running without water.”

Submersible pump application
Submersible pump application

What type of submersible pump is good?

Which type of submersible pump is suitable is indeed a question that is not easy to answer. You see, there are thousands of brands of submersible pumps on the market today. How can we easily choose a suitable submersible pump for ourselves without advice and support from the supplier or brand representative? But with thousands of brands, how to contact them all?

So let’s classify by origin criteria!

    • The line of submersible pumps made in Europe
    • Submersible pump from Asia
    • Chinese brands

Based on the investment budget and system requirements. It is much easier to choose a pump based on brand origin.


    • You want a cheap submersible pump that doesn’t require anything for the system, as long as it runs. Then you choose the Chinese company or the pump in Vietnam.
    • But the project is a system that requires flow control, apparent pump performance. Then you can choose a Japanese or European brand submersible pump. With products from Europe, they will meet industry standards, and at the same time have higher performance as well as durability, stability, … even though the price is not much different.

If you are looking for submersible pumps of EU origin, please contact Thai Khuong for advice and support and get to work quickly!

Immediately contact Thai Khuong Pumps via Hotline: 0941.400.488 for quick answers to questions about products, prices, and purchasing policies.

Submersible pumps

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