Pedrollo 2CP 25/16A Double-impeller Centrifugal Pump

1. Model Interpretation

1. Core Technical Parameters (50Hz, Three-phase 380/400V)

III. Structural Features and Material Description

1. Structural Composition

Double-impeller Design: Delivers higher head and more stable performance curve, improving efficiency by 10-15%.

Integral Cast Iron Pump Body: High-rigidity structure with vibration and noise reduction, suitable for high-pressure working conditions.

Integrated Mechanical Seal: Combination of graphite/ceramic/NBR materials, ensuring long-term leak-free operation.

Stainless Steel Motor Shaft: Made of AISI 431 material, featuring corrosion resistance and high strength to extend service life.

2. Core Component Materials

1. Key Points of Performance Curve (HS=0m)

The performance curve complies with the tolerance standard of EN ISO 9906 Grade 3B.

1. Application Scenarios
2. Residential Booster System: Water pressure boosting for high-rise residential buildings and villas, with optimal performance when used with a pressure tank.
3. Commercial Building Water Supply: Pressure stabilization for centralized water supply systems in hotels, office buildings, hospitals, etc.
4. Industrial Auxiliary System: Cooling water circulation, cleaning systems, low-pressure fire protection pressure stabilization systems.
5. Agricultural Irrigation: Pressure source for drip irrigation/spray irrigation systems in small and medium-sized farms and greenhouses.
6. Municipal Facilities: Pressure boosting for small water plants and secondary water supply systems.
7. Installation and Operation Key Points
8. Installation Specifications

Install in a well-ventilated and dry place, avoiding rain and direct sunlight.

The foundation shall be flat and firm, with shock-absorbing pads used to reduce vibration transmission.

Valves and pressure gauges should be installed at the inlet and outlet for easy maintenance and monitoring.

The suction pipeline must be well-sealed to avoid air leakage affecting suction lift.

It is recommended to install a check valve to prevent water hammer.

2. Operation Restrictions

No-idling operation is prohibited (which will damage the mechanical seal).

Ensure that the pump chamber and suction pipeline are filled with water before starting.

The medium must be clean water or liquid with chemical properties similar to clean water.

During continuous operation, ensure that the inlet pressure is ≥0.1bar to prevent cavitation.

VII. Fault Diagnosis and Troubleshooting

VIII. Selection Suggestions

1. Working Condition Matching Principle

When selecting flow rate, consider 1.1-1.2 times the maximum water demand of the system.

When selecting head, consider total system resistance loss + required working pressure + safety margin (0.5-1bar).

Ensure that the actual operating point falls within the high-efficiency zone of the performance curve (efficiency>55%).

2. Recommended Supporting Equipment

Pressure tank: Recommended volume ≥10L, used to stabilize pressure and reduce start-stop frequency.

Pressure switch: Adjustable range of 0.8-4bar, matching system pressure requirements.

Frequency converter: Used for precise control of flow/pressure, saving energy by 30-50% (suitable for variable load working conditions).

Protection devices: Thermal relay, circuit breaker (Type D), surge protector.

3. Alternative Model Reference

For higher head requirements: 2CP 32/210A (7.5kW, maximum head 112m).

For larger flow requirements: 2CP 40/200A (11kW, flow rate 9.6m³/h).

For single-phase power supply applications: 2CPm 25/16A (2.2kW, single-phase 230V).

1. Maintenance Cycle

The Pedrollo 2CP 25/16A is a high-efficiency and reliable double-impeller centrifugal pump specially designed for medium and high-pressure clean water delivery, suitable for various civil and industrial application scenarios. Its IE3 high-efficiency motor, high-quality materials and precision manufacturing process ensure long-term stable operation. With proper installation and maintenance, it can provide excellent performance and economic benefits. During selection, the working condition requirements should be strictly matched, and professional technical personnel should be consulted for the optimal solution when necessary.

Structural Features of Pedrollo 2CP 25/16A Double-impeller Centrifugal Pump

1. Core Structural Design Features
2. Back-to-back Double-impeller Design (Core Technical Highlight)

Back-to-back Series Double Impellers: Two brass impellers are arranged symmetrically along the axial direction to form a “back-to-back” structure, which effectively balances radial load and extends bearing service life.

Segmented Pump Body: The cast iron pump body is divided into suction section and discharge section, facilitating maintenance and impeller replacement. It has high overall rigidity and pressure resistance up to 10bar.

High-efficiency Hydraulic Channel: Optimized flow channel design reduces hydraulic loss, improves efficiency by 10-15%, and the high-efficiency zone covers a wider flow range (40-120l/min, efficiency>55%).

Axial Force Balance: The double-impeller design counteracts axial thrust, reducing the load on mechanical seals and bearings, and improving operational stability.

2. Close-coupled Structure

The motor is rigidly connected to the pump body without a coupling, reducing transmission loss and improving overall efficiency.

Shortens axial dimension, featuring compact structure and small floor area, with a weight of only 27.3kg (three-phase version).

Reduces vibration and noise transmission, enabling quieter operation with vibration level ≤2.5mm/s (ISO 10816 standard).

1. Key Component Materials and Characteristics

III. Motor System Structural Features

1. High-efficiency Motor Design

IE3 Energy Efficiency Class (three-phase version): Saves about 10% more energy than IE2 motors, complying with EU ErP Directive requirements.

Class F Insulation: Heat-resistant temperature of 155°C, improving motor overload capacity and service life.

IPX4 Protection Class: Splash-proof design, suitable for outdoor installation (needs shelter), with good dust-proof performance.

TEFC Cooling Method: Totally enclosed fan-cooled, high heat dissipation efficiency, suitable for continuous operation.

Built-in Thermal Protection: Three-phase version is equipped with PTC thermistor, single-phase version is equipped with thermal relay to prevent motor burnout due to overheating.

2. Electrical Connection and Control

The junction box is located on the top of the motor with IP55 protection class, facilitating wiring and maintenance.

Compatible with Frequency Converter Control: The motor is designed to support 0-50Hz stepless speed regulation, realizing precise control of flow and pressure, and saving energy by 30-50%.

Rated current 5.3A (400V three-phase), starting current ≤7 times the rated current, suitable for direct starting or star-delta starting.

1. Sealing and Protection System Features
2. Mechanical Seal Technology

Integrated Single-face Mechanical Seal: Installed between the pump cover and motor shaft without requiring additional cooling system.

Static Ring Fixed Structure: Realizes automatic compensation through stainless steel spring and O-ring, adapting to slight axial movement and vibration of the shaft.

Anti-dry Running Protection Design: Moderate contact pressure on the sealing surface reduces wear during dry running (long-term dry running is still prohibited).

2. Overall Protection Design

Electrophoretic Coating on Pump Body Surface: Corrosion resistance, UV resistance, extending outdoor service life.

Double Sealing of Motor Junction Box: Prevent moisture and dust from entering, protecting electrical components.

Shock-absorbing Foot Design: Four cast iron feet with rubber shock-absorbing pads reduce vibration transmission to the foundation structure.

1. Installation and Maintenance Convenience Design
2. Installation Compatibility

Inlet and outlet diameters 1¼”×1″ (DN25×DN25), standard ISO 228/1 thread, can be directly connected to PPR, PVC or metal pipelines.

Flexible Installation Direction: Can be installed horizontally or vertically (motor on top) to adapt to different space requirements.

Pressure gauge interfaces are reserved at both inlet and outlet for convenient system pressure monitoring and fault diagnosis.

2. Maintenance Convenience

Modular Design: The pump cover is fixed by 4 bolts. After disassembly, the impeller and mechanical seal can be directly replaced without disassembling the entire pump body.

Bearing Pre-lubrication Design: Long-acting lubricating grease is filled before leaving the factory, no need for supplementation within 2 years.

Standardized Wearing Parts: Mechanical seals, O-rings and other accessories have strong versatility, making procurement and replacement convenient.

1. Structural Advantage Summary

2. Structural Advantage	Practical Application Value
   Back-to-back Double-impeller Design	Balances radial load, reduces bearing wear, extends service life by more than 30%
   IE3 High-efficiency Motor	Significant energy saving during long-term operation, reducing operating costs
   Integral Cast Iron Pump Body	High pressure resistance, vibration and noise reduction, suitable for high-pressure working conditions
   Stainless Steel Shaft + Graphite/Ceramic Seal	Corrosion resistance, leak-free, long maintenance cycle
   Close-coupled Structure	High transmission efficiency, low vibration, small installation space requirement
   Modular Maintenance Design	Reduces downtime and maintenance costs

The structural design of Pedrollo 2CP 25/16A fully embodies the precision craftsmanship and reliability concept of Italian manufacturing. The double-impeller design gives it obvious advantages in the field of medium and high-pressure clean water delivery, and it is widely used in residential pressure boosting, commercial building water supply, industrial circulation systems and other scenarios. Its structural features not only ensure efficient and stable operating performance, but also reduce the whole-life cycle cost, making it a cost-effective double-impeller centrifugal pump product.