Choosing an industrial pump is not as simple as matching a pipe size or picking the model with the highest flow rate.
The right pump needs to match the actual operating conditions of the system, including the fluid being moved, required flow and pressure, suction conditions, solids content, available power, installation layout, and maintenance requirements. A pump that looks correct on paper but is poorly matched to the application can lead to reduced performance, frequent maintenance, premature wear, clogging, or unnecessary energy use.
That is why pump selection should start with the system—not the pump catalog.
Start With the Fluid
The first question is simple:
What are you pumping?
The answer affects almost every other part of pump selection.
Important fluid characteristics can include:
- Clean water or wastewater
- Slurries or solids-laden liquids
- Solids size and concentration
- Viscosity
- Temperature
- Corrosiveness
- Abrasiveness
- Chemical compatibility
A pump handling clean water has very different requirements from one moving wastewater, abrasive slurry, food-processing waste, or a fluid containing fibrous material.
For solids-handling applications, the size and type of solids are especially important. Impeller design, internal passage size, and pump construction all influence how effectively the pump can move the fluid without clogging or excessive wear.
Determine the Required Flow
Flow describes how much liquid the pump needs to move over a given period of time.
Choosing a pump based on connection size alone can be misleading because pumps with the same inlet and outlet size may have very different performance characteristics.
The required flow should reflect what the system actually needs under normal operating conditions.
Too little flow can prevent the system from keeping up with demand. Too much flow can create other problems, including unnecessary energy use, excessive velocity, and operation away from the pump’s intended performance range.
The goal is not simply to choose the largest pump available. It is to select a pump that operates effectively at the required flow.
Calculate Total Dynamic Head
Flow tells you how much liquid needs to move.
Head tells you how much resistance the pump must overcome to move it.
Total dynamic head can include:
- Vertical lift
- Discharge pressure
- Friction losses through piping
- Losses through valves and fittings
- Other resistance within the system
A pump must be selected to provide the required flow at the actual head conditions of the installation.
This is one of the most important parts of pump selection because a pump that cannot meet the required head will not deliver the expected flow.
Understand the Suction Conditions
The suction side of the system is just as important as the discharge side.
Questions to consider include:
- Is the liquid above or below the pump?
- Is the pump operating under flooded suction?
- Is suction lift required?
- How far is the pump from the liquid source?
- What size is the suction piping?
- Are there restrictions in the suction line?
- Could air enter the system?
These conditions can influence both pump type and installation method.
For example, self-priming pumps can be installed above the liquid being pumped, making them useful in applications where above-grade access and maintenance are important.
Consider Solids Handling
For wastewater and industrial applications, solids handling often deserves its own evaluation.
Important questions include:
- What is the maximum solids size?
- Are the solids soft, hard, fibrous, abrasive, or irregular?
- How concentrated are they?
- Is clogging already a problem in the existing system?
- Does the process produce debris that can wrap around or obstruct the impeller?
Different pump families are designed for different types and sizes of solids.
All Prime self-priming pumps, for example, use semi-open impeller designs intended for solids-handling applications. Specific solids capability varies by series and model, which is why actual application conditions should be reviewed before selecting a pump.
Select the Right Pump Type
Different pump types solve different problems.
Common industrial pump configurations include:
Self-Priming Pumps
Self-priming pumps can be installed above the liquid source and are commonly used in wastewater and solids-handling applications.
Their above-grade location can make inspection and service more accessible.
Submersible Pumps
Submersible pumps operate directly in the liquid being pumped and are widely used in wastewater, sump, and lift-station applications.
They can be a good fit where space above the wet well is limited or where the system is designed around submerged equipment.
Vertical Turbine Pumps
Vertical turbine pumps are often used when the liquid source is below grade, such as a well, sump, tank, or intake.
They are commonly selected for higher-flow or higher-head applications and can reduce floor-space requirements.
Horizontal Split Case Pumps
Horizontal split case pumps are often used in high-flow applications with flooded or pressurized suction conditions.
They are common in pump rooms, industrial facilities, fire protection systems, and water-handling applications.
Diaphragm Pumps
Air-operated double diaphragm pumps are frequently used where fluid compatibility, solids content, viscosity, chemical resistance, or dry-running capability are important.
The best pump type depends on the system—not simply the industry.
Consider Materials of Construction
The fluid being pumped can influence the materials used throughout the pump.
Material selection may be affected by:
- Corrosive chemicals
- Abrasive solids
- Temperature
- Sanitary requirements
- Seawater or brackish water
- Process compatibility
Using inappropriate materials can lead to premature wear, corrosion, contamination, or failure.
Material compatibility should therefore be considered during pump selection rather than after problems appear.
Review Available Power
The pump also has to match the available power source.
Important considerations can include:
- Motor horsepower
- Voltage
- Phase
- Motor speed
- Variable-frequency drive compatibility
- Available compressed air for pneumatic pumps
- Existing motor or drive equipment
The pump and motor should be selected as a system.
A properly selected pump paired with the wrong motor or speed can still deliver poor performance.
Think About Installation Space
Physical layout can significantly influence pump selection.
Consider:
- Available floor space
- Pump orientation
- Existing piping
- Access for maintenance
- Motor clearance
- Removal space for rotating assemblies
- Wet-well or tank locationreferec
- Whether the installation is indoors or outdoors
A pump may meet the hydraulic requirements perfectly but still be a poor choice if technicians cannot access it or remove service components.
Do Not Ignore Maintenance Access
Maintenance requirements should be considered before the pump is installed.
Ask:
- How will the pump be inspected?
- Which components are expected to wear?
- Can those components be reached easily?
- Does piping have to be removed to service the pump?
- Are replacement parts readily available?
- Can major assemblies be removed separately?
- Will service require confined-space entry?
All Prime self-priming pumps are designed with maintenance access in mind. Depending on the family and model, features can include removable rotating assemblies, accessible wear components, cartridge mechanical seals, clean-out-cover access, and external impeller-clearance adjustment.
These details can have a significant impact on long-term maintenance effort and downtime.
Replacing an Existing Pump? Start With What You Already Know
When replacing an existing industrial pump, the current equipment can provide valuable information.
Helpful details include:
- Manufacturer
- Model number
- Connection size
- Motor horsepower and speed
- Existing flow and head
- Pump curve
- Photos of the installation
- Current operating problems
- Maintenance history
- Fluid and solids information
But replacement should not automatically mean selecting an identical pump.
If the existing pump has experienced repeated clogging, failures, poor performance, or excessive maintenance, it may be worth reevaluating the application before choosing a replacement.
The system may have changed since the original pump was installed.
Look at the Entire System
A pump rarely operates by itself.
The surrounding system may include:
- Valves
- Piping
- Motors
- Drives
- Controls
- Instrumentation
- Hose and fittings
- Filtration
- Tanks
- Level controls
Pump performance can be affected by any of these components.
That is why MCE’s pump-selection guidance emphasizes reviewing the application and operating conditions as part of the larger system rather than treating the pump as an isolated component.
Information to Gather Before Selecting a Pump
Before requesting a pump recommendation, it helps to have the following information available:
- Fluid being pumped
- Required flow
- Total dynamic head or discharge pressure
- Solids size and concentration
- Fluid temperature
- Viscosity
- Material compatibility requirements
- Suction conditions
- Connection requirements
- Available power
- Installation space
- Duty cycle
- Existing pump information
- Maintenance goals
You may not have every answer immediately. That is normal.
The important thing is to provide enough information to evaluate the application rather than selecting a pump from only 1 or 2 specifications.
Getting Pump Selection Right From the Start
There is no single “best” industrial pump.
The right pump is the one that fits the fluid, system requirements, installation, and maintenance needs of the specific application.
Taking the time to understand flow, head, suction conditions, solids, materials, power, and service requirements before selecting equipment can help avoid many common pump problems later.
All Prime offers self-priming and other pump solutions for municipal and industrial applications, including wastewater and solids handling.
✅ Want a Quick Reference?
We’ve put together a simple 5-Point Pump Replacement Checklist to help you evaluate when it’s time to upgrade.
If you need help selecting a pump, share your flow, head, fluid, solids, suction conditions, power, and installation requirements. The All Prime team can help identify the pump and configuration that best fit the application.