Semi-submersible pumps are widespread not only in everyday life, but also in industrial fields. This is especially true for vertical models. Their main advantage is the vertical location of the shaft, so you can place such equipment in narrow and small wells. Semi-submersible vertical pump can be used not only as a separate unit. It can be one of the elements of a water supply system.
General information
Semi-submersible pumps serve for pumping clean or dirty water in plumbing and sewer networks.
They differ in rather small dimensions, are easy to operate, and also have a low noise threshold. Thanks to these advantages, a submersible pump is used in many fields, 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 view, a variety of centrifugal devices are used, which are used for pumping liquids, which 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 various conditions of the pumped liquid, that is, withstand temperature, density and the possible presence of solids. Semi-submersible pumps are not made from ordinary cast iron, since this material is unstable to different chemical media. When interacting with them, iron ions are released, which is unacceptable. Therefore, they choose a high-quality metal that is able to withstand not only chemical elements, but also withstand operation at high pressure.
Semi-Submersible Properties
Submersible pumps are used to treat domestic wastewater. They dip into the required fluid exactly halfway. That is, the pump part is immersed in contaminated water, and the electric motor is mounted on 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 the drains. An electric motor and a submersible pump serve as a drive. The case is made of stainless steel, which protects the engine from mechanical stress and moisture. In addition, such pumping equipment can be supplemented with special grinders. But for this, it is necessary to additionally install a more powerful engine with high throughput of solid particles. There should also be a fairly high-quality cooling system, since grinding various substances can lead to overheating. Fecal semi-submersible pumps are economical and easy to use. Thanks to their silent operation, they are increasingly being used for pumping sewage water.
terms of Use
So that centrifugal semi-submerged devices do not break, it is necessary to ensure the correct working conditions, as well as install monitoring devices. The main reason for 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 equipment from a process such as cavitation, in which water hammer occurs. They negatively affect the internal mechanisms, as well as the pipeline itself. Therefore, pressure gauges are installed on the non-return valve, which measure the pressure at the pump inlet. When high indicators appear, switch to sparing mode.
What to look for when choosing?
When choosing centrifugal devices, it is necessary to pay attention to such characteristics as power consumption, productivity, 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 strictly vertically. Installation in horizontal position or the slightest bias is excluded. Do not pump liquid that is not listed in the instruction manual. Such pumps may not withstand some aggressive chemicals. If solids are contained in the pumped liquid, grinders and an additional cooling system must be installed.
It happens that a semi-submersible pump must be used in 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 comply with all operating rules, then your device will last a long time.
Positive and negative sides
This type of pumping equipment has a powerful drive that provides high performance and pressure. To increase productivity, it is enough to strengthen the shaft located between the engine and the pump. Due to the fact that the device is divided into two parts, repair and maintenance are not difficult.
The semi-submersible pump is equipped with a special float, so you can quickly organize the pumping of water from any drain. All you need to do is 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 grinder. When pumping liquids with the presence of solids, it is necessary to additionally purchase and install a grinding device. Another negative side is the lack of engine protection against atmospheric precipitation and aggressive chemical fluid. Compared to submersible pumps, semi-submersible pumps create more noise.
Mounting
The installation process can only differ from the type and purpose of the pump. There is a mobile view, the installation of which consists in immersion in a liquid and fixing the electric motor with a float. In this case, it is necessary to ensure a good supply of power cable. In order to divert dirty water, flexible hoses of different lengths are used.
If the pump has a stationary design, then all of its elements should be attached to the tank enclosure. To fix the engine, erect a special platform.
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 operation of submersible pumps. The advantages are great performance and ease of installation and operation. A huge drawback is the noise, which can not be eliminated in any way, as well as the lack of a built-in grinder.
Conclusion
Semi-submersible centrifugal pumps play an important role in pumping liquids, which differ in chemical composition from ordinary water. They fully justify the money spent on them.