Semi-submersible pumps are widely used not only in everyday life, but also in industrial areas. This is especially true for vertical models. Their main advantage is the vertical arrangement of the shaft, which makes it possible to place such equipment in narrow and small wells. The vertical semi-submersible pump can be used not only as a separate unit. It may be one of the elements of the water supply system.
General information
Semi-submersible pumps are used for pumping clean or dirty water in water and sewer networks.
They are quite small in size, easy to operate, and also have a low noise threshold. Due to these advantages, the semi-submersible pump is used in many areas, such as heating, water supply, drainage, irrigation and much more. With the help of such a unit, the liquid is lifted by increasing the pressure. The device also includes an electric motor.
Semi-submersible chemical pump
Under this guise they representa variety of centrifugal devices used to pump liquids that differ in chemical composition from ordinary water. They have a second name. These are elements for chemical production. The material from which the semi-submersible centrifugal pump is made must be resistant to some of them. In addition, it must be ready for the various conditions of the pumped liquid, i.e. withstand temperature, density and the possible presence of solids. The semi-submersible pump is not made from ordinary cast iron, since this material is unstable to various chemical environments. When interacting with them, iron ions are released, which is unacceptable. Therefore, they choose high-quality metal that is able to withstand not only chemical elements, but also withstand work at high pressure.
Properties of semi-submersible devices
Submersible pumps are used to treat domestic wastewater. They fall into the required liquid exactly half. That is, the pump part is immersed in contaminated water, and the electric motor is attached to the surface with a float.
Thanks to such equipment, it became possible to extract liquid sludge, fecal matter, as well as fuel oil and peat from the bottom of drains. The electric motor and the submersible pump serve as the drive. The case is made of high-quality steel which protects the engine from mechanical influences and moisture. In addition, such pumping equipment can be supplemented with special grinders. But for this you need to additionally install a more powerfulengine with high solids throughput. There should also be a fairly high-quality cooling system, since grinding a variety of substances can lead to overheating. Fecal semi-submersible pumps are economical and easy to use. Thanks to their quiet operation, they are increasingly being used for pumping sewage.
Terms of Use
In order for centrifugal semi-submersible devices not to break, it is necessary to ensure the correct working conditions, as well as install control devices. The main cause of failure is the ingress of solids into the impeller. To avoid this, you need to install a special coarse filter.
It is also necessary to protect the equipment from a process such as cavitation, which causes water hammer. They adversely affect the internal mechanisms, as well as the pipeline itself. Therefore, pressure gauges are installed on the check valve to measure the pressure at the inlet to the pump. When high rates appear, you should switch to a gentle mode.
What to look for when choosing?
When choosing centrifugal devices, it is necessary to pay attention to such characteristics as power consumption, performance, weight and overall dimensions. You should also consider the material from which all work items are made.
Terms of service
The service life of a semi-submersible pump depends on how it is used. Devices must be installed strictlyvertically. Installation in a horizontal position or the slightest slope is excluded. Do not pump any liquid that is not specified in the instruction manual. Such pumps may not withstand some aggressive chemical compounds. If the pumped liquid will contain solids, grinders and an additional cooling system must be installed.
It happens that a semi-submersible pump needs to be used during the cold season. Under this condition, you need to insulate it or install it in a heated room. If this is not done, the case may be damaged. It is important to follow all the rules of operation, then your device will last a long time.
Good and bad sides
This type of pumping equipment has a powerful drive that provides high productivity and pressure. To increase productivity, it is enough to strengthen the shaft located between the motor and the pump. Due to the fact that the device is divided into two parts, repair and maintenance are easy.
Semi-submersible pump is equipped with a special float, so you can quickly organize the pumping of water from any drain. All that needs to be done is to find out the length of the pit and provide for the optimal laying of the pipeline.
Among the shortcomings, it is worth highlighting the lack of an internal chopper. When pumping liquids containing solids,additionally purchase and install a grinding device. Another negative side is the lack of engine protection from atmospheric precipitation and aggressive chemical fluid. Compared to submersible pumps, semi-submersible pumps generate more noise.
Installation
The installation process may differ only from the type and purpose of the pump. There is a mobile view, the installation of which consists in immersing in a liquid and fixing the electric motor with a float. In this case, it is necessary to ensure a good supply of the power cable. In order to divert dirty water, flexible hoses of different lengths are used.
If the pump has a fixed design, then all its elements should be attached to the tank fence. To fix the engine, a special platform is erected.
Cost
The price of semi-submersible pumps varies from 35,000 to 100,000 rubles. It all depends on the design and technical characteristics of the device.
Reviews
Many users are satisfied with the performance of semi-submersible pumps. The advantages are high performance and ease of installation and operation. A huge disadvantage is the noise, which can not be eliminated, as well as the lack of a built-in chopper.
Conclusion
Semi-submersible centrifugal pumps play an important role in pumping fluids that are chemically different from ordinary water. They fully justify the money spent on them.
