CE Certification Submersible Mixed Flow Pump

Submersible mixed flow pumps are specialized hydraulic machines designed to operate while fully submerged in liquid. These pumps combine the characteristics of axial flow and radial flow pumps, making them versatile and efficient for various applications. The working principle of a submersible mixed flow pump involves an impeller that rotates within a casing, creating a combination of axial and radial flow patterns. This unique design allows the pump to handle large volumes of liquid while maintaining moderate to high head pressures.

The structural features of submersible mixed flow pumps include a sealed motor unit directly coupled to the pump body, ensuring compact design and efficient operation underwater. The impeller is typically semi-open or enclosed, with curved vanes that guide the fluid flow. A key component is the diffuser, which helps convert velocity energy into pressure energy, enhancing overall pump efficiency.

These pumps offer several advantages in various application scenarios. Their submersible nature eliminates the need for priming and reduces the risk of cavitation, making them ideal for deep well installations and flood control systems. They are also widely used in wastewater treatment plants, irrigation systems, and industrial processes where large volumes of water or other liquids need to be moved efficiently.

The versatility of submersible mixed flow pumps is evident in their ability to handle both clean and contaminated liquids, including those containing solid particles. This makes them particularly valuable in sewage and drainage applications. Additionally, their compact design allows for installation in confined spaces, reducing the footprint of pumping stations and simplifying maintenance procedures.

Technical Requirements and Standards

To obtain CE certification, submersible mixed flow pumps must comply with a range of technical specifications and standards. The CE mark indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA). For submersible mixed flow pumps, one of the key standards is EN 12050-2:2015, which specifies requirements for wastewater lifting plants for buildings and sites.

While EN 12255-2007 is not a current standard for submersible sewage pumps, the updated EN 12050 series provides relevant guidelines. These standards cover aspects such as materials, minimum free passages, pipe connections, and electrical equipment. Pumps must also comply with the Machinery Directive 2006/42/EC, which outlines essential health and safety requirements for machinery in the EU.

Other relevant standards include:

- IEC 60335-2-41 for electrical safety of submersible pumps

- EN 809:1998+A1:2009 for general safety requirements of pumps and pump units

- EN ISO 12100:2010 for general principles of machinery safety design

Compliance with these standards ensures that the pump meets the necessary safety, performance, and reliability criteria for CE certification.

Safety Features

Safety is a paramount concern in the design and operation of submersible mixed flow pumps. To meet CE certification requirements, these pumps incorporate several critical safety features. Leakage protection is a fundamental aspect, typically achieved through multiple sealing systems. This may include mechanical seals, O-rings, and oil chambers that prevent water ingress into the motor compartment.

Overload protection is another crucial safety feature. This is usually implemented through thermal overload relays or motor protection switches that cut off power to the pump if it exceeds safe operating temperatures. Some advanced models incorporate built-in temperature sensors within the motor windings for more precise protection.

Many submersible mixed flow pumps also feature moisture sensors that can detect any water infiltration into the motor housing, triggering an alarm or shut-off mechanism to prevent electrical hazards. Ground fault circuit interrupters (GFCIs) are often integrated or recommended for installation to protect against electric shock.

To meet CE safety standards, pumps must also have adequate ingress protection (IP) ratings. For submersible pumps, this is typically IP68, indicating complete protection against dust and the ability to operate continuously underwater.

These safety features not only protect the pump from damage but also ensure the safety of operators and the environment, aligning with the core principles of CE certification. They demonstrate compliance with the essential health and safety requirements outlined in the Machinery Directive and related standards.

Performance Testing

Performance testing is a critical step in the CE certification process for submersible mixed flow pumps. This rigorous evaluation ensures that the pump meets or exceeds the performance standards required for certification. The testing process typically involves a series of controlled experiments to measure key performance indicators.

Flow testing is conducted to verify the pump's capacity to move liquid at various operating points. This involves measuring the volume of liquid pumped per unit of time under different conditions. Head testing assesses the pump's ability to overcome hydraulic resistance and lift liquid to specified heights. These tests are often combined to create performance curves that illustrate the pump's capabilities across its operating range.

Efficiency testing is crucial for determining the pump's energy consumption relative to its output. This involves measuring input power and comparing it to the hydraulic power produced. High efficiency is not only a mark of quality but also aligns with EU energy efficiency directives.

Power testing evaluates the electrical characteristics of the pump motor, ensuring it operates within specified voltage and current parameters. This includes start-up current measurements and power factor analysis.

Throughout these tests, factors such as noise levels, vibration, and temperature are also monitored to ensure compliance with relevant standards. The test results are meticulously documented and analyzed to verify that the pump meets or exceeds the performance criteria outlined in applicable standards such as EN ISO 9906:2012 for rotodynamic pump testing.

To ensure the reliability of test results, many manufacturers use certified testing facilities or have their in-house laboratories accredited by recognized bodies. The comprehensive nature of these tests provides concrete evidence that the submersible mixed flow pump meets the performance standards required for CE certification, giving customers confidence in the product's capabilities and compliance with EU regulations.

Submersible Mixed Flow Pump Factories

When it comes to selecting a manufacturer for submersible mixed flow pumps, Tianjin Kairun stands out as a reputable option. Their product range includes several models designed to meet various application needs. The 350QZ-50, 500QZ-75, 600QZ-100, 700QZ-100, and 800QZ-5 models represent a diverse lineup capable of handling different flow rates and head pressures.

These models are engineered to comply with relevant standards and undergo rigorous testing to ensure performance and safety. While specific details about each model would require verification from the manufacturer, it's common for such pumps to feature robust construction, efficient motors, and safety features in line with CE certification requirements.

For those in the market for submersible mixed flow pumps, it's advisable to contact manufacturers directly to discuss specific needs and verify compliance with relevant standards. Tianjin Kairun can be reached at :catherine@kairunpump.com for detailed information about their product range and certification status.

References:

1. European Committee for Standardization. Wastewater lifting plants for buildings and sites.

2. European Parliament and Council. Machinery Directive

3. International Electrotechnical Commission. Household and similar electrical appliances - Safety.

4. European Committee for Standardization. Pumps and pump units for liquids - Common safety requirements.

5. International Organization for Standardization. Safety of machinery - General principles for design.