Centrifugal and screw pumps

In this article, you will learn how to choose the right pump for your needs. practical information about centrifugal and screw pumps. If you are interested in theoretical construction and principle of operation, go to section How centrifugal pumps are constructed.

Impeller pumps

How to choose a centrifugal pump – device characteristics

Handling wastewater and other chemicals requires appropriate equipment, Therefore, the selection of a pump is particularly important – it allows for easy transport of the liquid to the storage location. In this article, we will characterize centrifugal pumps for drainage works, domestic sewage service and advanced industrial systemsRead on to find out which pump to choose, or save time and Ask us Request a quote directly. We'll help you make a choice based on your specific situation.

Impeller pumps – applications

These products are characterized by a compact design and relatively simple operation, therefore have many applications both in industry and construction. device types are adapted dopressingwater, sewage, liquid fuels i chemicalsAcid-resistant pumps are also available, They cope perfectly with aggressive liquids.

Impeller pumps are very often installed in industrial systems. sewage systems, e.g. near factories, public buildings and in domestic sewage pumping station. These devices are also used for periodic work related to drying flooded residential premises, basements and other facilities such as excavations.

Types of centrifugal pumps

Currently, the most commonly used are the so-called centrifugal pumps – with rotor placed in a spiral body. Due to the position of the device's shaft, stands out here:

• horizontal type KAN – for pumping pure chemical liquids,
• KCG type – for chemically aggressive liquids,
• KCN type – for aggressive liquids, without solids.

• KFN type – pumps with heating jacket,
• KGN type – for aggressive liquids with slight contamination,
• mechanically,
• KSL type, CCB – for aggressive and clean liquids.

Some liquids require more advanced equipment, but according to EU directive – pumps that are to be approved for operation in conditions at risk of explosion and products intended for the transfer of flammable and explosive substances, must have appropriate certificates. TOFAMA Service sp. z o. o. pumps meet these requirements - you will find confirmation of current tests by browsing Certifications.

Impeller pumps – advantages and disadvantages

The main advantages of centrifugal pumps include: high work efficiency, by a small one lifting heightThe advantage here is also ease of pump installation, because due to the good speed performance, the equipment has nsmall size and mass.

Impeller pumps are very durable – minimal moving parts are subject to abrasion, which extends the life of the equipment. Depending on the model, often it is also possible to directly couple the device to high-speed drive engines, which increases work efficiencyIf you want to understand more about how we increase performance, learn more. how centrifugal pumps are constructed.

Impeller pumps – disadvantages and contraindications

Correct selection is necessary due to the fact that some centrifugal pumps are quite sensitive to contamination. mechanicalwhich contribute to the wear of rotor components. Some devices they also don't tolerate it wellgas content in the liquid – their presence can sometimes result in interruption of flow. Fortunately, the type we produce KGN-Ex pumps solves this problem.

Unlike most manufacturers, we pay special attention to selecting the right product for your needs. Consult us about your needs and we'll get you there in no time. choose the right pumpDon't waste time wondering about the right choice – just ask, and we'll quickly send you an offer tailored to your needs.

Centrifugal pump efficiency

This is the most important parameter of the device's operation, on which the flow rate depends and efficiency of the entire process. It usually depends on the device specifications and motor that was used as the drive unit. Check the efficiency of each pump using the tabs on the left. Check the example documentation of one of the centrifugal pumps (KKB).

Currently, units are produced with a capacity of 50, 100, 250 and even 350 liters per minute. Units with higher parameter values ​​are most often connected to industrial wastewater handlingwhich require quick transport to place of storage.

Maximum suction height of the centrifugal pump

Depending on the drive unit, the devices may feature different suction height of the pump. When deciding to purchase it, you should therefore precisely select the parameters, depending on the operating conditions. Incorrect suction height may result in serious overload of the engine and its rapid seizure. This can also cause cavitation, which significantly reduces the efficiency of the pump and causes its damage.

At TOFAMA Service sp. z o. o., we are one of the few manufacturers that strive to guide our customers in making the right choice. Use the contact form and adjust the efficiency and suction height of the centrifugal pump to your needs.

Selecting a centrifugal pump to suit your needs

Which device is best? When choosing a pump, it's worth considering hardware parameters. It's a good idea to establish a few things first:

• the purpose of the pump – whether we are looking for a product for a new installation or to replace an existing one,
• size and type of installation,
• expected overall dimensions and weight of the pump unit,
• quality of the device you are looking for

Once you have determined your needs, it's worth checking the pump's ratings by navigating through the tabs on the left. Pay particular attention to: efficiency, maximum suction height, i energy efficiency of pumpingYou can also check the pump's continuous operating range and the flow rate in the inlet area. If you want to save yourself a lot of work comparing pump properties, simply Contact us, describing your needs and we will present an offer tailored to your needs.

Deep well centrifugal pumps

Submersible centrifugal pumps, as the name suggests, are primarily used to extract water from deep groundwater wells, but this is not their only application. Submersible pumps are widely used in many industries, agriculture, and households. 

The mechanism operates on the principle of converting kinetic energy into pressure energy. The rotating rotor is driven by the engine's energy. The driving force is increased by increasing the liquid's angular momentum in the rotor. The mechanism operates thanks to the pressure difference generated and the buoyancy force of the blades.

Modern pumps have a more automated operating system, making them less prone to failure than traditional pumps of this type. You can find this submersible pump model in our offer under Vertical centrifugal pumps.

We will solve your problem

At TOFAMA Service sp. z o. o., we are prepared for this eventuality, and therefore provide appropriate solutions. We ensure that the customer achieves their intended goal with the help of our products. Speak with a consultant about selecting a centrifugal pump at +48 56 619 53 98, or describe your situation in the section Contact.

The success of your project is our success.

Impeller pumps for dirty water

If you're looking for a centrifugal pump for septic tanks, sewage, or wastewater, you've come to the right place. These pumps are made of stainless steel and are used to extract and remove even foreign bodies contained in liquids. An example of such a pump is PSRM pump – screw pump for dirty water. Our pumps are excellent at removing contaminants in the form of chemical liquids and physical objects. This is especially important when choosing a pump for sewage or wastewater.

This water contains many objects that require shredding (from paper to all the garbage that ends up in the septic tank). The pump is powered by an electric motor, but the housing is completely waterproof, allowing the device to be submerged in water. We use mechanical seals from reputable companies.

Impeller pumps for dirty water, thanks to their competitive price and high quality, have become a frequent choice of our customers.

Multi-stage centrifugal pumps

Pumps vary in application and model. Multistage centrifugal pumps have two or more impellers, which distinguishes them from single-stage pumps. 

Recall that the operation of a centrifugal pump is based on the conversion of mechanical energy into kinetic energy via an impeller. This type of pump is mainly used in water installations and industrial plants, because their demand for electricity is much greater.

If you are looking for a pump for your own use, a much better choice would be single-stage centrifugal pumpwhich you will find in our offer.

Centrifugal impeller pumps – price

Our product range is particularly diverse, as evidenced by the wide selection of pumps in the menu on the left. We strive to meet your expectations, so you can choose the pump model that perfectly suits your needs.

Impeller pumps vary in technical specifications and applications, so prices for individual models may vary. Our prices are tailored to ensure a satisfactory price-to-quality ratio for all parties. If you have any questions about pricing or ordering, please use our contact formDescribe your situation and we will prepare a quote according to our price list for centrifugal and screw pumps.

We are waiting for you!

You can also call one of the contact numbers located in the left column in the tab "Contact"

Centrifugal pump testing and certificates

Our devices are among the best-manufactured pumps in Poland. We pay attention to every detail, which is why it's so important to us to confirm the quality of our products. We hold numerous certificates confirming the safety and hygiene of TOFAMA Service sp. z o. o. products. Conducted tests confirm that PSRS single-screw positive displacement pumps They pose no threat to humans. Product quality is as important as safety, which is why we strive to ensure our products are functional and as easy to use as possible.

We also hold certificates issued by institutions such as the European Union, the Eurasian Customs Union, and the National Institute of Public Health. Examples:

• EU Certificate of Conformity
• EAC Certificate
• Health quality certificate
• Hygienic Certificate for taps and valves

Check the "CERTIFICATES” available on our website to confirm the validity of our research. We place particular emphasis on regular reviews and research.

Impeller pumps – regulation

The latest models of centrifugal pumps have a built-in option of speed regulation.

What does this actually mean – what is pump regulation?

The ability to control settings was introduced to reduce the device's electricity demand.

Regulation allows for a reduction in the amount of energy transferred to the fluid and a reduction in pressure. At TOFAMA Service sp. z o. o., we use electronic speed control to automatically adjust the pump's operating parameters. This is crucial, as incorrectly set parameters can have the opposite effect, i.e., increased electrical consumption.

Another common problem that occurs when incorrect parameters are set is the production of loud noise, such as hissing (the device simply operates louder, which is uncomfortable for people nearby). Ultimately, the phenomenon of so-called underheated terminals can also occur. Therefore, at TOFAMA Service sp. z o. o., we managed to solve this problemWe'll also answer any other questions you may have – Contact us.

Screw pumps

What is a screw pump? 

The single-screw pump belongs to the group of rotary displacement pumps with the ability to self-prime a liquid and then pump it in a specific direction (a type of positive displacement pump). Thanks to this mechanism, the screw pump has found numerous applications – both in households and industry. There are many products on the market based on this principle, but each differs in its purpose and technical parameters.

Screw pump – operating principle 

First, the operating principle of a screw pump: Once the pump is started, the screw begins to rotate, a rotational motion. The previously empty space fills with liquid, and the screw's movement along the pump axis transports the liquid in a specific direction. The liquid already sucked in cannot flow back; it is transported completely. This feature minimizes pump failure and speeds up the pump's operation. 

Schematic diagram of the screw pump construction

The design of a screw pump is surprisingly simple considering the device's capabilities. The pump is also called a screw pump because of its operating principle. The pump's most important components are the steel rotor and stator. During pump operation, the rotor performs a rotational-circular motion in the stator, causing the fluid to be pumped.

The pump can reliably suck high-viscosity liquids, including those containing rounded solids. The pump's design allows for gentle liquid transport without affecting the physical appearance of the product being transported. This is particularly important when PSRS type food pumps i PSRSSP, where the natural properties of the material must be preserved.

Advantages of screw pumps

Screw pumps are distinguished primarily by their durability, are used in places where similar devices may be damaged. The pump allows for transport liquids with a high content of abrasive materials, which is not possible with a rotor pump.

A screw pump allows chemical fluids to flow and be pumped without changing their physical and chemical properties. This is especially important when using the pump in industrial sectors, as the screw enables the transport of dense suspensions, mortar, Czy slurryThanks to their simple construction and maximum sealing, these devices are both perennial, as well as practically failure-free.

Screw pump - application

The screw pump is extremely versatile. Currently, the device is primarily used in a wide range of industries, such as transportation. liquids with strong chemical properties, dense, or contaminated with foreign bodiesThe screw pump is an essential element in food processing plants, where it is used to transport substances such as: fats, Czy sticky products.

The pump is also used in slaughterhouses and farms to transport feed for farm animals. It's worth noting that the screw also allows for the transport of ordinary liquids such as water. This allows for the delivery of liquids to homes, small businesses, and recreational facilities.

Selection of a screw pump

To choose the best type of screw pump, we need to know its intended use. Models differ in technical parameters, and each is designed for a different type of fluid. It's also important to determine the source and method of pumping the fluid or other similar substance. Pump efficiency depends on rotational speed, and this parameter should be considered when purchasing a device with good technical parameters.

If you are not sure which pump model will be best for you because you are not familiar with these parameters, please ask a question via contact form (or read the entire article). We'll advise you which screw pump model will be best for you. based on the description of the specific situation for which you want to use the pumpContact details and a quick inquiry form can be found on the website in the contact tab.

Screw pumps – prices

The prices of screw pumps vary greatly. Currently, there are several companies producing them on the Polish market. In addition, imported products are available online. The selection is very wide, so the production technology and application of the pump have the greatest impact on the final price. Our offer includes every model you're looking for: from general-purpose PSRP pumps, after PSRSP single-screw industrial pump.

Our offer includes not only the entire device but also individual parts, which can be purchased separately. In this case, prices are determined individually depending on the quantity ordered. For more information, please use the contact form located on our website in the contact section, or send an email to our Customer Service Department. bok.tofama[at]tofama.eu. It is also possible telephone contact (tel: +48 566 195 418).

Deep well pump – screw or rotor?

Both screw and rotary pumps have many different applications in industry and everyday use. As the name suggests, these pumps are used to pump various types of substances from one place to another. They differ only in their operating mechanism, which means their applications are different. The fact is that Deep well rotor pumps are more commonly used in households due to their availability. We can distinguish vertical and horizontal centrifugal pumps. 

Screw pumps, on the other hand, due to their design, have a high tolerance for solids in the pumped liquids. They simply don't get damaged as easily, which extends their service life. Screw pumps are much more frequently used for liquid pumping in the food and chemical industriesand rotor pumps in waterworks companies or in deep wellsThe choice of submersible pump type depends on its intended use.

Deep-well screw pumps

Deep well pumps are mainly used when drawing water and/ or her transportThey are used when the water level is below 8m, and the pump must be completely submerged in water. Deep-well screw pumps are often used in domestic wells to draw water.

A centrifugal pump can't handle this type of fluid. Well water is often contaminated with gravel or sand, which can clog the impeller. Therefore, a submersible screw pump is the best solution in this case: thanks to its design, it can pump fluids that are even if there are large and rounded foreign bodies in it.

Screw or diaphragm pump

Screw and diaphragm pumps differ primarily in their operating mechanism. Diaphragm pumps are driven by compressed air and belong to the positive displacement pump group. They enable the transport of food substances (juices, oils, liquids) as well as highly aggressive chemical fluids.

The diaphragm pump is used in many industries in the same way as the screw pump, but due to its operating principle, it has its disadvantages. A diaphragm pump cannot transport liquids with solid particles larger than several millimeters. Unfortunately, this will damage the mechanism.

Another disadvantage is the pulsating flow generated by the pump, which cannot be used for certain materials. The screw pump is definitely more efficient, and thanks to the constant flow it allows transport of substances without interfering with their structureWe'll help you choose the right screw pump – you'll find our entire product range here here.

Screw or monoblock pump

A monoblock pump operates using a motor that is directly coupled to an impeller or worm; this mechanism is called a monoblock. The pump operates both horizontally and vertically, making it suitable for irrigation systems (including pumping both cold and hot water).

If we decide to buy a monoblock submersible pump, we must be aware that it must be placed in a tank in which the water column is at least one meterIf the water column in our tank doesn't meet this parameter, we're forced to choose a different type of submersible pump. A screw pump is ideal for this purpose.

Screw pumps for sewage sludge and liquid manure

Purchasing a screw pump for sewage sludge or liquid manure is the best solution. It doesn't interfere with the composition of the pumped liquid, so it operates very quickly and efficiently. This type of pump is ideal for both agricultural and domestic use.

We can use it not only for liquid manure but also for emptying septic tanks or sewage, even if the pumped substance is very thick and contains impurities. Well screw pumps also perform their function well, providing us with comfort in the household.

Screw pumps for plastering machines

Helical pumps, also known as "screw pumps", are a component of equipment used in construction work; they can be found, for example, in plastering machines.

As previously mentioned, the pump consists of a stator and a rotor. Screw pumps have an additional pin that allows us to improve the mechanism's operation (directly adjusting the screw). This system is commonly used in machines for processing gypsum-lime plaster, mortar, and other more challenging mixtures.