Advantages and disadvantages of installing an inlet filter on a circulation pump

Appropriate filters should be installed, and a pressure gauge (or a differential pressure gauge) can be placed before and after the filter to monitor whether it is clogged. If necessary, a differential pressure transmitter can also be installed for monitoring from the control room.

Whether to install a filter depends on the properties of the medium being transported. If the medium contains a high level of impurities, it is necessary to install a filter; if it gets clogged, there is no other option but to stop operation and clean it. Nowadays, one filter is usually in use while another serves as a backup, which has little impact

It’s best to use pump equipment, with one in operation and one as a backup, along with regular cleaning: lol

Since it is to be reused, cleanliness must be ensured to reduce blockages; therefore, a filter screen must be installed, and the filter screen should be cleaned regularly. It is best to install pressure gauges before and after the filter screen, so that cleaning can be carried out immediately when the pressure difference reaches a certain level.

It is very necessary to install a filter screen. It can prevent debris from entering the pump as well as remove debris from the circulating water. Typically, the diameter of the pipes for circulating water is quite large; finished products with such specifications are generally not available. We manufacture them ourselves by cutting a section of the circulating water pipe, attaching two flanges to it, inserting a thin tube inside, making holes in it, covering those holes with filters of the appropriate mesh size, and then welding it to flanges that have sealing surfaces on both sides. To clean it, simply remove the short circuit and proceed with the cleaning.

It should be set up, and attention should be paid to the following: 1. The pipelines must be purged thoroughly before operation； ⒉Strengthen inspections, and promptly switch to cleaning when abnormalities are detected in pressure, current, or the valve position of the backflow control valve ； ⒊A differential pressure gauge can be installed before and after the filter, with its readings transmitted to the control room for monitoring ； ⒋Do not install a filter screen when transporting liquids containing large-particle media. As long as the work is done carefully, there’s no problem.

It mainly depends on the medium being transported; in most cases, a filter screen is used. If the filter screen becomes clogged, the flow rate at the pump outlet will definitely decrease; in such cases, it is necessary to stop the pump and clean the filter screen.

Filters should be installed to prevent foreign objects from entering the impeller and causing equipment failures. The filtering accuracy and filtration area of these filters must be selected based on the properties of the medium (viscosity, cleanliness, and any components of the equipment that may fall off during operation). It is necessary to clean the filters regularly during operation to establish an appropriate cleaning schedule.

It is definitely necessary to install a filter screen, and to clean it regularly.

There is a filtration method used in many large circulation pumps; either when the pressure is too high, or by reinforcing the filter mesh and shaping it into a cone, with the top of the cone being hollowed out and connected to pipes. The purpose of this is to allow particles to be separated from the fluid continuously, without having to remove the filter mesh.

But it can be determined by the impurity content in the circulating water you use!

The circulation pump is equipped with a filter screen, which should be cleaned regularly.

1. Parallel filters 2. Appropriate filtration precision 3. If it is a very important pump, an automatic backwash filter can be considered, but it is more expensive

When the filter screen becomes clogged during operation, it reduces the height difference between the inlet of the circulation pump and the liquid level, thereby lowering the inlet pressure. This condition can easily lead to cavitation in the slurry circulation pump. The principle behind this is that as the liquid flows within the pump impeller, the shape of the impeller’s flow channels and its high-speed rotation cause the pressure to be unevenly distributed. When the filter screen for the circulating water becomes clogged, it reduces the height difference between the pump’s inlet and the liquid level, resulting in a lower inlet pressure. When the pressure in the low-pressure area drops to the saturated vapor pressure corresponding to the liquid temperature, the local liquid immediately vaporizes to form bubbles, causing a sudden decline in the pump’s performance and even severe vibration and noise. Over time, this leads to damage to the surfaces of the impeller’s flow channels, resulting in cavitation marks that appear sponge-like or honeycomb-shaped. This can be addressed by improving the suction conditions of the pump, increasing its net positive suction head, optimizing the suction installation height, enhancing the pump’s own structure, and adding an inlet inducer wheel

Filter clogging is caused by two factors: scaling or deposition, and in most cases scaling results from an excessively high pH value, with the supersaturation of gypsum exceeding 1.4. Its main component is CaSO4, so it is necessary to pay attention to controlling the pH value inside the tower during operation. The deposition is mainly caused by the fact that the limestone is not finely ground enough – its particles are too large – and as a result it does not participate in the absorption reaction, instead settling directly at the bottom of the absorption tower.