Submersible Slurry Pumps: Characteristics, Use and Advantages

Submersible slurry pumps are a type of pump designed to handle a mixture of solid particles and liquids. These pumps are crucial in applications where the handling of abrasive or corrosive fluids is required. They are submerged directly into the slurry, hence the name, and can handle a variety of materials, from fine particles to larger solids.

Characteristics of Submersible Slurry Pumps

Submersible slurry pumps are known for their robust construction and durability. They are typically made with high-chrome impellers and wear-resistant rubber diffusers to withstand the harsh conditions of slurry transport. These pumps are usually equipped with heavy-duty bearings and a double silicon carbide mechanical seal to ensure reliable operation under challenging conditions. They also feature a unique sealing system and modular design, which provides flexibility and ease of maintenance.

The Structure of a Submersible Slurry Pump

Now, understanding the structure of submersible slurry pumps is crucial for those involved in their operation, maintenance, or selection. Here, we delve into the components that make up a submersible slurry pump and their functions.

Impeller and Casing

At the heart of a submersible slurry pump is the impeller, which is responsible for imparting kinetic energy to the slurry, allowing it to move through the pump and out to the discharge point. The impeller’s design can vary, with options such as semi-open or closed impellers, each suited for different types of slurries and solid sizes.

Surrounding the impeller is the casing, which guides the slurry from the impeller to the discharge. The casing is designed to maximize efficiency and minimize wear, often constructed from durable materials like high-chrome alloys to withstand the abrasive nature of the slurry.

Suction Plate and Volute

The suction plate is located at the pump’s inlet and plays a pivotal role in directing the slurry into the impeller. The volute is the spiral-shaped chamber that encases the impeller and helps convert the kinetic energy into pressure. Together, these components ensure the smooth intake and flow of the slurry within the pump.


Many submersible slurry pumps feature an agitator located near the impeller. This component is essential for stirring up settled solids, ensuring they remain suspended in the slurry for effective pumping.

Sealing System

A robust sealing system is critical for preventing slurry from entering the motor compartment. Submersible slurry pumps typically employ a double mechanical seal made of silicon carbide, providing superior resistance to abrasion and corrosion.

Shaft and Bearings

The pump shaft connects the impeller to the motor, transmitting the rotational force necessary for operation. Bearings support the shaft, allowing it to rotate smoothly while handling the load of the impeller and the slurry.


The engine is an integral part of a submersible slurry pump, providing the power needed to drive the impeller. These engines are designed to operate while submerged and are often equipped with thermal protection to prevent overheating.

Maintenance and Selection

Let’s now investigate what the maintenance submersible slurry pumps need. Simply, regular inspection of components like the impeller, seals, and bearings is necessary to ensure optimal performance. Maintenance is straightforward due to the pumps’ design, which allows for easy access to parts that may require servicing.

When selecting a submersible slurry pump, it is important to consider the size, power, and volume requirements of the application. Pumps are available in various models to suit different needs, with features like motor protection systems and thermal protection for the electric motor.

At the end of the day, the structure of a submersible slurry pump is a complex assembly of components, each playing a vital role in the pump’s operation. From the robust impeller and casing to the efficient sealing system and powerful motor, every part is designed to handle the demanding task of slurry transportation.

With proper understanding and maintenance, these pumps can provide reliable service in the harshest industrial environments.

Uses and Industries

The primary use of submersible slurry pumps is to transport slurry, which is a mixture of solid particles and liquid. They are widely used in industries such as mining, dredging, construction, and wastewater treatment. In mining, they are used for dewatering and transferring tailings and other byproducts. In dredging, they help in the excavation of sediments and in the construction industry, they are used for managing waste and transferring concrete.

Advantages of Submersible Slurry Pumps

One of the main advantages of submersible slurry pumps is their ability to handle solids of various sizes without clogging. This is due to their large apertures and high-efficiency agitators that lift settled solids. They are also highly efficient, capable of pumping high volumes of slurry with considerable power.

Critical issues in the use of submersible slurry pumps

Like any industrial equipment, they are not without their challenges. Understanding these critical issues is essential for maintaining operational efficiency and prolonging the life of the pumps. Here are some of the common problems associated with submersible slurry pumps:


Cavitation occurs when air bubbles form on the suction side of the pump and implode on the pressure side, causing shock waves that can damage the impeller and other internal components.

Abrasive Wear

The continuous movement of abrasive particles within the slurry can lead to significant wear and tear on the pump’s components, particularly the impeller and the casing. Utilizing wear-resistant materials and routine maintenance can reduce the impact of abrasive wear.


The chemical composition of the slurry can cause corrosion, affecting the pump’s longevity. Selecting materials that can withstand corrosive substances is crucial for the pump’s durability.


Solid particles in the slurry can cause blockages, leading to reduced flow and increased pressure. Regular cleaning and the use of strainers or filters can help prevent clogging.


Inadequate lubrication, a clogged cooling system, or damaged bearings can lead to overheating. Routine maintenance and the installation of temperature sensors can prevent overheating issues.

Mechanical Seal Failure

Mechanical seals prevent fluid from leaking out of the pump. Over time, these seals can degrade, leading to leaks. Using durable materials for seals and conducting regular inspections can extend their lifespan.

Electrical Issues

Moisture intrusion into electrical components, improper electrical installations, or voltage fluctuations can lead to electrical issues. Ensuring waterproofing measures and electrical integrity is vital for the safe operation of the pump.

Sediment Build-up

When used in deep sumps, sediment build-up can be problematic, leading to reduced efficiency and potential damage to the pump. Regular monitoring and cleaning are necessary to address this issue.

Noise Levels

Submersible slurry pumps can generate high noise levels, which may be a concern in certain environments. Implementing noise reduction strategies can help mitigate this issue.

In conclusion, while submersible slurry pumps are designed to handle tough conditions, they are subject to several critical issues that require attention. Proper design, material selection, and maintenance practices are key to addressing these challenges and ensuring the reliable operation of submersible slurry pumps.

Features of Pemo submersible slurry pumps

The PEMO submersible slurry pumps are designed for heavy duty slurry applications. In particular, in Pemo Pumps products we garantee:

  • High efficiency motor (class IE3) with power ranging from 1 to 100 hp, and speeds from 735 to 3,500 rpm (50 and 60 Hz).
  • Standard capacities up to 700 m3/h (3,082 gpm).
  • Maximum pressure up to 7 bar (103 psi).
  • Double mechanical seals, silica carbide or widia wear rings, oil lubricated.
  • Radial bearings, life lubricated and maintenance free, are made to deliver long-life.
  • All PEMO Submersible slurry pumps are provided with thermal probe (for the control of motor temperature), and two oil level probe (for slurry leak detection inside the oil chamber).
  • The Pemo Submersible slurry pumps all are sold with an electric device for the analysis of the signals from the thermal probes.
  • We provide also an optional agitator, mechanical and/or hydraulic type.

On request we can also supply a hydraulic and / or mechanical stirrer.

Are you interested in this type of product? Contact us to find out more!

Submersible Slurry Pumps

new submersible slurry pumps grey color

Pemo Submersible Slurry Pump Design

Submersible Slurry Pumps design