When it comes to managing water and wastewater, pumps play a crucial role in various applications. Two commonly used types of pumps are sewage pumps and submersible pumps. While they may seem similar at first glance, these pumps have distinct characteristics and are designed for different purposes. 

Definition and Primary Function

Let's start by defining each type of pump and understanding their primary functions:

Sewage Pump: A sewage pump is specifically designed to handle wastewater containing solids, debris, and other materials typically found in sewage systems. These pumps are built to efficiently move sewage from residential, commercial, or industrial settings to treatment facilities. Its primary function is to transport raw sewage, which may include human waste, toilet paper, and other substances that can be flushed down toilets or drains.

Submersible Pump: A submersible pump, on the other hand, is a versatile pump designed to operate while fully submerged in liquid. These pumps can handle a wide range of applications, from draining flooded basements to transferring water in industrial processes. While some submersible pumps can handle small solids, they are not specifically designed for sewage applications.

The key difference in their primary functions lies in the type of liquid they're meant to handle. Sewage pumps are specialized for dealing with wastewater containing solids, while submersible pumps are more general-purpose and can be used for various water transfer applications.

Material and Construction

The materials used in the construction of two pumps differ due to their specific applications:

Sewage Pump: Sewage pumps are built to withstand the harsh and corrosive nature of sewage. They are typically constructed using durable materials such as cast iron, stainless steel, or heavy-duty thermoplastics. The casing, impeller, and other components are designed to resist abrasion and chemical corrosion. These pumps often feature a rugged construction with larger clearances to allow solids to pass through without clogging.

Submersible Pump: Submersible pumps are also built to be durable, but their construction may vary depending on the specific application. They can be made from materials such as stainless steel, cast iron, or thermoplastics. The motor housing is typically sealed to prevent water ingress, allowing the pump to operate while submerged. Submersible pumps used for clean water applications may have a more compact design compared to those used for slightly contaminated water.

Both types of pumps are designed to be watertight, but sewage pumps often have additional features to prevent leakage and protect against the corrosive nature of sewage. The construction of sewage pumps also takes into account the need for easy maintenance and cleaning, given the nature of the materials they handle.

Impellers and Performance

The impeller design is a crucial factor that distinguishes sewage pumps from submersible pumps:

Sewage Pump: Sewage pumps typically feature specially designed impellers to handle solids and prevent clogging. Common impeller types for sewage pumps include:

• Vortex Impellers: These impellers create a swirling action that keeps solids suspended in the liquid, reducing the risk of clogging.

• Grinder Impellers: Some pumps incorporate grinder mechanisms that cut or macerate solids before pumping, allowing for easier transportation through pipes.

• Non-Clog Impellers: These impellers have a design that allows larger solids to pass through without getting stuck.

The impeller design in sewage pumps prioritizes the ability to handle solids efficiently while maintaining good flow rates. This design often results in a slightly lower overall efficiency compared to pumps designed for clean water.

Submersible Pump: Submersible pumps can have various impeller designs depending on their specific application. Some common impeller types include:

• Closed Impellers: These are efficient for handling clean or slightly contaminated water.

• Semi-Open Impellers: Suitable for handling small solids or slightly dirty water.

• Open Impellers: Used in pumps designed for handling larger solids or more contaminated water.

Submersible pumps used for clean water applications often prioritize efficiency and flow rate over the ability to handle solids. However, some submersible pumps designed for drainage or wastewater applications may incorporate features similar to those found in sewage pumps.

In terms of performance, sewage pumps are optimized for handling thick, solid-laden liquids at moderate flow rates, while submersible pumps can offer a wider range of performance characteristics depending on their specific design and application.

Pump Supplier

Understanding the differences between sewage and submersible pumps is crucial for selecting the right equipment for your specific needs. While both types of pumps can operate in submerged conditions, sewage pumps are specialized for handling wastewater containing solids, featuring robust construction and impeller designs optimized for this purpose. Submersible pumps, on the other hand, offer more versatility and can be used in a wide range of water transfer applications.

When it comes to selecting high-quality pumps for your sewage or water management projects, Tianjin Kairun Pump Co., Ltd. stands out as a trusted and reliable partner. Our extensive product range encompasses specialized pumps designed to efficiently manage wastewater with high solid content and versatile submersible pumps suitable for a multitude of water transfer applications. We are committed to excellence in every aspect of our operations, from research and development to manufacturing and after-sales service.

All of our products are meticulously designed and rigorously tested to meet the highest industry standards, including ISO and other relevant certifications. This ensures that our pumps deliver exceptional performance, reliability, and durability in even the most demanding conditions. We understand that each project has unique requirements, which is why we offer extensive customization options. Whether you need a pump with specific flow rates, head capacities, materials, or additional features, our team of experts will work closely with you to tailor a solution that perfectly matches your needs.

Moreover, our comprehensive after-sales support is designed to provide you with peace of mind throughout the entire lifecycle of your pumps. Our services include professional installation guidance, prompt troubleshooting assistance, regular maintenance services, and timely supply of genuine spare parts. We are dedicated to ensuring your complete satisfaction and the optimal performance of our pumps in your specific application.

For more detailed information about our product range or to discuss your specific pump requirements, we warmly invite you to contact our customer service department at catherine@kairunpump.com.

References

1. Grundfos. (2021). Sewage pumps vs. submersible pumps: What's the difference? 

2. Pump Industry Analyst. (2020). Choosing between sewage and submersible pumps. Water & Wastewater International, 35(2), 22-25.

3. Environmental Protection Agency. (2019). Wastewater Technology Fact Sheet: Sewers, Conventional Gravity. EPA 832-F-99-040.

4. Hydraulic Institute. (2018). Submersible Pump Standards (ANSI/HI 11.6-2017). Parsippany, NJ: Hydraulic Institute.

5. Tschopp, J., & Stutz, B. (2017). Submersible motor pumps: A review. Renewable and Sustainable Energy Reviews, 79, 32-43