CNP-TYPE PUMPS
CNP-type pumps are centrifugal pumps with a horizontal design, volute casing with a horizontal split, and transfer channels. They can be two- or four-stage, with single-suction impellers symmetrically mounted on the shaft.
CNP-type pumps and pump units based on them are designed for pumping clean or slightly contaminated, chemically neutral, low-viscosity liquids with temperatures up to 100 °C.
Main Specifications of CNP-Type Pumps (Depending on Modification):
- Flow rate: 360 m³/h – 3,000 m³/h
- Head: 83 m – 380 m
- Efficiency (η): 70% – 81%
- Motor power (equivalent): 132 kW – 2,500 kW
- Pump weight: 1,220 kg – 15,850 kg
- Complete unit weight: 2,525 kg – 4,740 kg
| Pump Designation | Flow Rate, m3/ч | Head, m | Rotational Speed, rpm | Allowable NPSH, m | Pump Efficiency, % | Motor Power, kW | Pump Weight, kg | Unit Weight, kg |
|---|---|---|---|---|---|---|---|---|
| CN 400-105 | 400 | 105 | 1470 | 4,5 | 80 | 200 | 1220 | 2840 |
| CN 400-105а | 380 | 96 | 1465 | 4 | 78 | 160 | 2715 | |
| CN 400-105б | 360 | 83 | 77 | 132 | 2525 | |||
| CN 400-210 | 400 | 210 | 1475 | 4,5 | 79 | 400 | 2645 | 4680 |
| CN 400-210 | 380 | 192 | 4 | 77 | 315 | 2637 | 4210 | |
| CN 400-210 | 360 | 166 | 76 | 250 | 2627 | 4010 | ||
| CN 1000-180-3 | 1000 | 180 | 1480 | 8 | 83 | 630 | 2370 | 4740 |
| CN 1000-180а-3 | 900 | 157 | 81 | 500 | 4520 | |||
| CN 3000-197-2 | 3000 | 197 | 1000 | 13 | 83 | 2500 | 15850 | |
| 14М-8х4-1 | 600 | 380 | 1480 | 6 | 70 | 1000 |
CN-type centrifugal pumps are general-purpose pumps.
All CN-type pumps can be grouped together based on several common design features: a semi-volute inlet, volute discharge, and transfer channel; a multi-stage design that allows high pump capacity to generate a high head for the pumped water.
The modernization and improvement of CN-type pump designs are aimed at increasing efficiency, energy performance, and reliability, while reducing energy consumption and material usage.
Key Areas of Improvement Include:
- Optimization of the flow part
- Increased erosion resistance of flow components
- Enhancement of bearing and other structural units
- Use of mechanical seal (end-face seal) technology
- Reduction of noise and vibration levels
- Extension of maintenance intervals
- Increased overall service life of the pump
Special Reliability Requirements for CN-Type Pumps
The scope of application and operating conditions of the CN type pumps determined the basic requirements for their design:
- Ensure high reliability and extended service life (mean time between major overhauls: at least 20,000–32,000 hours)
- Ensure external tightness
- Maintain a stable, continuously declining head characteristic over a flow range from 20% to 110% of nominal capacity to allow stable parallel operation within the main system
Extending the Operating Range of CN-Type Pumps:
Achieved by trimming the impeller diameter by no more than 10% of its original size, while ensuring that the efficiency drop does not exceed 3%
Additional Factors Directly Affecting Reliability and Energy Efficiency:
- Correct selection of the CN-type pump according to required system parameters
- Consideration of operational conditions and integration into the pumping system
- Accuracy and quality of manufacturing
- Professional installation and proper operation
Complying with these requirements can improve the reliability and efficiency of the equipment by 15–20%, which is a very high performance level and a critical factor for the overall operation of the pump unit.
The application and operating conditions of CN pumps determine the key design requirements:
- High reliability and extended service life (average service life before major overhaul – at least 20,000-32,000 hours);
- Ensuring external tightness;
- A stable, continuously decreasing pressure characteristic in a flow rate range from 20% to 110% of the nominal flow rate to ensure reliable parallel operation in the main network.
Expanding the range of CN pumps is achieved by trimming the impeller outer diameter by no more than 10% of the original diameter, while the efficiency reduction should not exceed 3%.
Furthermore, the reliability and energy efficiency of CN pumps are directly affected by:
- Correct selection of CN pumps according to the required network parameters;
- Consideration of operational features and integration into the pumping equipment flow chart;
- Precision and quality of manufacture;
- Qualified installation and subsequent operation. Compliance with these requirements will improve the reliability and efficiency of the equipment by 15-20%, which is a very high indicator and a critical factor in the operation of the entire pumping unit.
Pumps of CN-type must reliably operate in automatic mode without constant presence of maintenance personnel and ensure reliable performance when connected to the main network.
The main requirements for the design of CN-type pumps:
- High reliability and economy;
- Extended range of use through impeller trimming;
- Long service life;
- Dynamic stability across the entire operating range;
- Stable, continuously declining head characteristic to ensure stable operation when pumps are run in parallel;
- Proper selection of materials for main components to provide the required service life under operating conditions;
- Selection of the appropriate type of seal;
- High degree of standardization;
- Ease of assembly, disassembly, maintenance, and high repairability under operating conditions.
CN-type pumps and pump units based on them are designed for pumping water and liquids with properties similar to water in terms of viscosity and chemical activity, with temperatures up to 100 °C, containing solid inclusions not exceeding 0.05% by mass, with a maximum particle size of 0.2 mm, and microhardness not exceeding 6.5 MPa (650 kgf/mm²), in water supply systems of industrial and municipal facilities, in agriculture and land reclamation for irrigation and drainage, and other applications.
As a drive for CN-type pumps, asynchronous electric motors with a nominal rotational speed of 1000–1480 rpm are used.
Design and structural features of CN-type pumps and electric pump units based on them (ACN type)
Let us consider the structure of an ACN-type pump unit. It includes the following main components:
- CN-type pump assembled with auxiliary pipelines within the pump. The pump parameters are selected in accordance with the required network parameters.
- Drive. An asynchronous electric motor is used as the drive for CN-type pumps.
- Frame. Common or separate, depending on the pump size. Supplied upon customer request in accordance with the contract.
- Coupling. Pumps are equipped with an elastic pin-and-bush coupling of MUVP type.
- Coupling guard.
- Automation and instrumentation. Each pump unit is equipped with an automation and instrumentation system that ensures monitoring of key operating parameters, automatic control during start-up and shutdown modes, and automatic shutdown in case of unacceptable deviations of process parameters.
CN-type pumps are centrifugal, horizontally arranged, volute-type (with semi-volute inlet and volute outlets, with interstage transfer channels), with a horizontally split casing, two- or four-stage, with single-suction impellers installed symmetrically with their main discs facing each other.
In the lower part of the pump casing there are support feet, as well as suction and discharge nozzles directed in opposite directions, perpendicular to the pump axis. This arrangement of the nozzles and the horizontal casing split allow disassembly, assembly, and maintenance of the pump without disconnecting pipelines or removing the electric motor.
Axial force balancing is achieved by the symmetrical arrangement of the impellers. The rotor is supported by external rolling bearings. Bearing lubrication is grease (plastic type). Shaft sealing is mechanical with gland packing, with supply of cooling and sealing fluid.
- application of a new high-efficiency hydraulic (flow) part with increased efficiency;
- use of higher-grade materials and coatings for flow part components to improve erosion resistance;
- use of rolling bearings manufactured by SKF, featuring high precision and low friction torque, enabling operation at high rotational speeds with low noise, wear, heat generation, and energy consumption;
- application of mechanical seals;
- use of an elastic disc coupling (between the motor and the pump) to improve vibration characteristics and increase the reliability of the pump unit.
The purpose of modernization is to improve the reliability, efficiency, and operational safety of the pump.
BUY CN-TYPE PUMPS FROM THE MANUFACTURER CHT SLOVAKIA S.R.O.
To order a specific unit or receive consultation on selection, you can contact our sales department by phone listed on the website or submit a request via the feedback form. We deliver our products to all CIS countries (except Russia and Belarus) and across Europe.
CHT Slovakia s.r.o. is a leading manufacturer and supplier of high-quality industrial pumps. Our CN-type centrifugal pumps are designed in accordance with the most modern requirements for reliability, energy efficiency, and durability. They are ideal for demanding industrial applications and ensure uninterrupted operation under various conditions. On this page, you can ознакомиться with models CN 400-105, CN 400-210, and CN 1000-180-3, as well as obtain useful information about selection, ordering, and purchasing equipment.
FEATURES OF CN-TYPE PUMPS
CN-type pumps are horizontal centrifugal volute-type units with a horizontally split casing and interstage transfer channels. They are two- or four-stage, equipped with single-suction impellers symmetrically arranged on the shaft. The design includes a semi-volute inlet, volute outlet, and transfer channel, ensuring high performance and head.
Key features:
- High reliability: Service life before overhaul — 20,000–32,000 hours. Axial force is balanced by symmetrical impeller arrangement.
- Energy efficiency: Efficiency up to 81%, reduced energy consumption due to improved hydraulic design.
- Seals and bearings: Mechanical face seals with gland packing and cooling fluid; external rolling bearings by SKF with grease lubrication for minimal friction and noise.
- Installation and maintenance: Suction and discharge nozzles are perpendicular to the axis, allowing pump disassembly without disconnecting pipelines or removing the motor.
- Additional advantages: Erosion-resistant materials, elastic coupling to reduce vibration, stable head curve (declining shape within 20–110% of nominal capacity), possibility of impeller trimming to expand operating range (efficiency reduction not more than 3%).
These pumps are модернизированы to increase service life, reduce noise and vibration, and improve maintainability.
APPLICATIONS OF CN-TYPE PUMPS
CN-type pumps are designed for pumping clean or slightly contaminated (solid content up to 0.05% by mass, particle size up to 0.2 mm) chemically neutral, low-viscosity liquids with temperatures up to 100 °C, similar in properties to water. They belong to the general-purpose pump category and operate automatically without permanent staff.
Main application areas:
- Water supply systems for industrial and municipal facilities.
- Agriculture and land reclamation (irrigation and drainage).
- Water transfer in energy, chemical industry, and other sectors.
- Operation within common networks with high stability and dynamic reliability.
Due to external tightness and erosion resistance, these pumps are ideal for long-term operation in demanding conditions.
CN-TYPE PUMP MODELS
The range includes the following models adapted for different tasks. Model CN 400-105 provides a flow rate of 400 m³/h with a head of 105 m, rotational speed of 1470 rpm, NPSH of 4.5 m, efficiency of 80%, and motor power of 200 kW; pump weight — 1220 kg, unit — 2840 kg. Model CN 400-210 provides the same flow rate of 400 m³/h but with a head of 210 m, speed of 1475 rpm, similar NPSH, efficiency of 79%, and power of 400 kW; unit weight — 4680 kg. For more demanding applications, CN 1000-180-3 provides 1000 m³/h, head 180 m, speed 1480 rpm, NPSH 8 m, efficiency 83%, and power 630 kW; pump weight — 2370 kg, unit — 4740 kg.
These models are equipped with asynchronous electric motors (1000–1480 rpm) and can be supplied with pipelines, coupling, guard, and automation for full parameter control.
HOW TO CHOOSE A CN-TYPE PUMP
Correct pump selection is key to efficient system operation. Consider:
- Network parameters: flow rate (360–3000 m³/h) and head (83–380 m).
- Operating conditions: liquid temperature, contamination level, process scheme.
- Additional factors: installation quality, seal type, materials (for erosion resistance), possibility of parallel operation and automatic mode.
- Consultation: contact CHT Slovakia s.r.o. specialists for calculation — this increases reliability and efficiency by 15–20%.
We will help select a model that meets your requirements, considering standardization and maintainability.
PROCEDURE FOR ORDERING AND PURCHASING A CN-TYPE PUMP
Ordering and purchasing CN-type pumps from CHT Slovakia s.r.o. is simple and transparent:
- Consultation: contact the sales department by phone, email, feedback form, or visit the office (Röntgenova 3751/28, Bratislava, 85101, Slovakia).
- Selection and calculation: engineers calculate the unit (pump + drive + frame + coupling + automation).
- Order placement: specify model (e.g., CN 400-105), configuration, and delivery conditions. Delivery is available across CIS (except Russia and Belarus) and Europe.
- Payment and delivery: after confirmation, payment and production/shipment follow. Terms – by agreement.
- Installation and service: instructions and services provided to ensure 20,000+ hours of operation.
For purchase, use the website form or direct contact — fast delivery and full support are guaranteed. CHT Slovakia s.r.o. ensures market-leading quality.
FREQUENTLY ASKED QUESTIONS ABOUT CN-TYPE PUMPS
CN-type pumps are designed for pumping clean and slightly contaminated chemically neutral liquids with physical and chemical properties similar to water. Solid content up to 0.05% by mass is allowed, with a maximum particle size of up to 0.2 mm. The operating temperature of the liquid is up to 100 °C.
CN-type pumps are used in industrial and municipal water supply, power engineering, chemical and petrochemical industries, agriculture, land reclamation and irrigation, as well as at high-pressure pumping stations.
The pumps feature a service life of 20,000–32,000 hours before overhaul, high efficiency up to 83%, multistage design for high head, vibration resistance, erosion-resistant hydraulic parts, mechanical seals, and SKF bearings.
Yes, CHT Slovakia s.r.o. provides customized configuration of pump units, including material selection, installation of reinforced bearings, mechanical seals, variable frequency control, automation, and instrumentation systems.
Selection is based on flow rate, head, liquid temperature, impurity content, NPSH, installation conditions, and operating mode. Engineers of CHT Slovakia s.r.o. perform professional hydraulic calculations and select the optimal model.