A sewage pump should not be selected only by horsepower, nominal flow and head, or purchase price. For industrial wastewater service, the starting point is the wastewater itself: maximum solids size, fibers or rags, sediment, corrosiveness, and temperature. Then define the required flow and total dynamic head (TDH), installation arrangement, pit or wet-well depth, suction conditions, power supply, and duty cycle.
A self-priming pump is practical only when the real suction lift and suction piping are workable. Deep wet wells and continuously submerged duties often favor submersible arrangements. Settling wastewater may justify an auto-mixing design, while corrosive wastewater requires a separate material-compatibility review.
Selection inputs: Wastewater type | Solids | Flow | TDH | Installation | Pit depth or suction lift
Need Help Checking Your Duty Conditions?
If you already know your wastewater type, flow, head, installation method, or pit depth, you can send your available duty data to Koleburg for a preliminary pump-type review.
Button: Review My Duty Conditions
What Information Do You Need Before Selecting a Sewage Pump?
The correct sewage pump begins with a complete duty profile. Flow and head are essential, but they do not describe what must pass through the pump, where the pump will be installed, or what operating risks the system creates.
Characterize the Wastewater Before Choosing the Pump
Start by identifying the wastewater source and what is actually carried in the liquid.
Important questions include:
- Is the medium municipal sewage, industrial wastewater, construction drainage, leachate, sludge-related wastewater, or another process stream?
- What is the maximum expected particle size?
- Is the solid content known?
- Are rags, fibers, stringy materials, hair, plastic strips, or similar materials present?
- Does sludge or sediment settle at the bottom of the pit?
- Is the wastewater abrasive?
- Does it contain corrosive chemicals?
- What is the approximate operating temperature?
A wastewater stream containing hard particles creates a different selection problem from one dominated by flexible fibers. Likewise, sediment that settles in a sump creates a different risk from suspended solids that remain moving with the liquid.
That is why the label “non-clog” alone is not enough. The actual pump passage and impeller or flow-path configuration still have to be checked against the wastewater.
Define Required Flow and Total Dynamic Head
The required flow should come from the process or drainage requirement, not from the capacity of an existing pump unless that existing installation has already been verified.
For many open-tank wastewater systems, TDH is built from:
TDH = static elevation requirement + pipe friction losses + valve and fitting losses
If the system includes pressurized vessels or other pressure requirements, those conditions must also be included.
The pump then has to deliver the required flow at that actual TDH. A larger motor does not correct a pump whose hydraulic operating point is wrong.
Confirm Installation, Power, Duty Cycle and Maintenance Access
Before comparing pump models, define:
- Wet-well, pit, dry-pit, inline, or above-ground installation
- Normal and minimum liquid level
- Pit depth
- Pump elevation
- Suction-pipe arrangement for a self-priming design
- Available maintenance access
- Voltage, phase, and frequency
- Continuous, intermittent, or emergency duty
- Level controls and required motor protection
- Available space for removal and servicing
| Minimum duty input | Why it matters | If unknown |
|---|---|---|
| Wastewater source/type | Establishes the application | Describe where the wastewater comes from |
| Maximum solids size | Affects solids passage | Describe visible solids |
| Fibers/rags | Indicates wrapping risk | State whether stringy debris is present |
| Sediment tendency | Indicates settling risk | Describe pit-bottom buildup |
| Required flow | Defines hydraulic duty | Provide process/drainage requirement |
| TDH or system data | Defines required head | Provide elevations and piping |
| Pit depth/liquid level | Affects arrangement | Provide a site sketch |
| Power supply | Affects motor configuration | Confirm site electrical supply |
| Duty cycle | Affects operation/protection | State continuous/intermittent/emergency |
Get a Preliminary Pump Type Recommendation
Send the wastewater type, solids information, approximate flow/head, and installation conditions you already know. Unknown items can be marked “Not sure.”
Button: Check My Pump Type
Which Sewage Pump Arrangement Fits the Site?
There is no single sewage pump arrangement that is best for every wastewater system. Installation conditions frequently eliminate unsuitable options before detailed model sizing begins.
Submersible vs. Self-Priming — Start With Installation and Suction Conditions
A submersible sewage pump operates in the liquid and is a logical candidate for wet wells, deep pits, underground drainage, and applications where the pump is intended to remain submerged.
For wastewater stations, see the more focused guide to submersible sewage pump selection.
A self-priming sewage pump is installed outside the pit or basin. This can make above-ground inspection and maintenance easier, but the suction system becomes a critical part of pump reliability. Pump elevation, liquid level, suction-pipe diameter and length, fittings, airtightness, and available NPSH all matter.
The self-priming pump suction lift guide provides a deeper review of suction piping and NPSH considerations.
When Sediment Favors an Auto-Mixing Arrangement
If the primary problem is sludge or solids settling at the bottom of a pit, increasing solids passage alone may not address the root cause.
An auto-mixing submersible arrangement can be evaluated when the objective is to disturb accumulated material and reduce persistent sediment near the pump intake. This should be considered only where settling is a real site condition—not as a default addition to every sewage pump.
When Dry-Pit, Inline or Corrosion-Resistant Arrangements Make Sense
A horizontal sewage pump may be considered where the pump is installed in a dry pump room and ground-level maintenance access is important.
An inline non-clog arrangement can be considered where the piping layout and available footprint favor a pipeline-mounted configuration.
For chemically aggressive wastewater or leachate, material compatibility becomes a primary selection factor. A stainless steel route may be appropriate, but the actual wetted-material grade and sealing arrangement should be confirmed from wastewater chemistry rather than chosen from the word “stainless” alone.
| Site condition | Candidate arrangement | Why it may fit | Still confirm |
| Deep wet well or pit | Submersible | No long suction line from surface | Solids, TDH, lifting/service method |
| Ground-mounted pump with feasible suction | Self-priming non-clog | Accessible pump location | Suction lift, piping losses, air leakage |
| Heavy bottom sediment | Auto-mixing submersible | Addresses settling near intake | Sludge characteristics and duty |
| Dry pump room | Horizontal sewage pump | Surface maintenance access | Foundation, piping, solids passage |
| Pipeline installation | Inline non-clog | Compact piping arrangement | Pipe size, duty point, maintenance space |
| Corrosive wastewater | Stainless steel sewage pump | Material-focused route | Chemistry, temperature, actual alloy |
How Do You Size a Sewage Pump by Flow and TDH?
A sewage pump is sized around an operating point: the flow the system requires at the head the pump must overcome.
Determine the Required Design Flow
The required flow depends on the application.
A wastewater treatment influent station may be governed by process inflow and peak conditions. A construction-dewatering system may be driven by expected water ingress. A municipal lift station may require duty and standby operating logic.
Do not simply select the pump with the highest published flow. The required duty should reflect how much liquid the system actually needs to move.
Build Total Dynamic Head From Static Lift and System Losses
Static elevation is only one part of the head requirement.
To establish TDH, collect:
- Minimum and maximum liquid levels
- Discharge elevation
- Pipe diameter
- Pipe length
- Pipe material
- Number and type of fittings
- Valves and check valves
- Expected operating flow
Friction increases as flow changes, so a sewage-pump system is not defined by one static number alone.
Check the Operating Point Against the Pump Curve
After Q and TDH are established, the candidate pump must be checked on its actual performance curve.
The curve is more useful than motor horsepower because it shows whether the required duty point is inside the pump’s workable hydraulic range.
For model-level selection, request the actual performance curve and datasheet instead of assuming that a pump family name or motor rating guarantees the required performance.
Engineering rule: calculate the system requirement first, then select the pump. Do not choose horsepower first and try to make the system fit the motor afterward.
How Do Solids, Fibers and Sediment Change Pump Selection?
Clogging risk is one of the main reasons a sewage pump that appears hydraulically adequate can still perform poorly in service.
Match Maximum Particle Size to the Actual Solids Passage
Maximum particle size should be compared with the actual free passage or solids passage of the candidate pump.
A product described as a non-clog submersible sewage pump still requires model-level confirmation. “Non-clog” describes a design objective or flow-path approach; it does not mean that every object entering the wet well will pass through the pump.
Specific passage dimensions must come from the actual model datasheet.
Treat Rags and Fibers as a Wrapping Risk, Not Just a Particle-Size Problem
Flexible material creates a different failure mode from rigid particles.
A rag may deform enough to enter a passage but still wrap around an impeller or rotating component. Long fibers can accumulate even when their nominal thickness is small.
For this reason, provide the manufacturer with information about:
- Rags
- Fibers
- String-like debris
- Plastic film or strips
- Historical impeller wrapping
- Frequency of manual cleaning
Impeller and flow-path selection should then be matched to the real debris characteristics. For a more focused review, see the non-clog submersible sewage pump FAQ and RFQ guide.
Separate Settling Problems From Ordinary Solids Handling
Sediment creates a system problem as well as a pump problem.
Material may settle below the pump, accumulate around the intake, or repeatedly enter the pump at high local concentration. In these cases, merely increasing nominal solids passage may not eliminate the operating problem.
| Wastewater characteristic | Main risk | Selection question |
| Large rigid particles | Passage blockage | What is the verified solids passage? |
| Rags/fibers | Wrapping | What impeller/flow path is suitable? |
| Heavy sediment | Settling and intake blockage | Is mixing or sump management required? |
| Abrasive solids | Wear | Which wetted materials need review? |
| Corrosive wastewater | Corrosion | Are wetted materials compatible? |
The correct approach is to identify the dominant failure mechanism first and then select the hydraulic design and material arrangement around it.
How Much Suction Lift Is Practical for a Self-Priming Sewage Pump?
There is no useful universal “maximum suction lift” number that can be applied to every sewage installation.
The practical limit depends on the complete suction system.
Separate Static Suction Lift From Total Suction-Side Losses
Static suction lift is the vertical distance between the liquid level and pump reference elevation. But the pump must also deal with losses created by the suction pipe.
Long piping, restrictive fittings, insufficient diameter, blockage, and unfavorable routing all increase suction-side losses.
Two installations with the same vertical lift can therefore have very different priming and operating behavior.
Check Air Leaks, Priming Conditions and NPSH/Cavitation Risk
Self-priming reliability also depends on maintaining an airtight suction system.
Typical issues include:
- Air leakage at joints or fittings
- Inlet blockage
- Insufficient liquid retained for the priming cycle
- Excessive suction-pipe losses
- Changing pit liquid level
- Liquid temperature
- Site elevation
- Insufficient NPSH margin at the required flow
If a pump takes progressively longer to prime, repeatedly loses prime, or operates with cavitation symptoms, do not assume that a larger motor is the solution. The suction arrangement needs to be reviewed.
Know When a Submersible Pump Is the Safer Arrangement
A self-priming design should be reconsidered when the required suction lift and losses leave inadequate operating margin, when long suction piping creates recurring air-leak risk, or when the installation is fundamentally better suited to continuous immersion.
In such cases, a submersible sewage pump can remove the long suction-lift problem from the system layout.
Not Sure Whether Self-Priming or Submersible Fits Your Site?
Send your pit depth, liquid-level range, pump elevation, suction-pipe arrangement, solids/fiber condition, flow and TDH. Koleburg can review whether a self-priming route remains practical or whether a submersible or non-clog arrangement should be evaluated.
Button: Review My Installation
How Should the Pump Type and Configuration Match the Wastewater?
Once the wastewater, duty point, solids risk, and installation conditions are understood, product selection can move from a broad pump category to a practical candidate route.
Koleburg’s sewage pump range includes different arrangements for different wastewater conditions.
| Project condition | Candidate Koleburg route | Why investigate it | Confirm before model selection |
| Deep wet well / immersed duty | Submersible Sewage Pump | Avoids surface suction-lift arrangement | Flow, TDH, solids, motor/protection |
| Solids/fibers in wet well | Non-Clog Submersible Sewage Pump | Focuses on solids-handling flow path | Particle size, fibers, actual passage |
| Ground installation with workable suction | Self-Priming Non-Clog Sewage Pump | Above-ground access plus non-clog route | Suction lift, NPSH, airtight piping |
| Significant pit sediment | Auto-Mixing Submersible Sewage Pump | Adds a route for settling problems | Sediment characteristics and sump condition |
| Dry-pit installation | Horizontal Sewage Pump | Surface-mounted maintenance arrangement | Layout, foundation, Q/TDH |
| Pipeline-mounted duty | Inline Non-Clog Sewage Pump | Fits certain compact pipeline layouts | Pipe interface and service access |
| Corrosive wastewater | Stainless Steel Sewage Pump | Material-oriented sewage-pump route | Chemistry, temperature and material grade |
Application also matters. For example, a municipal sewage lift pump and a wastewater treatment influent pump may both handle sewage, but their hydraulic duty, station arrangement, control requirements, solids profile, and maintenance plan can differ.
Match a Sewage Pump to Your Wastewater Conditions
Share wastewater characteristics, required flow, TDH, installation method, power supply, and operating conditions. The next step is to confirm the pump-type route, material direction, motor/protection requirements, and any missing information before model selection.
Button: Match My Application
How Do You Troubleshoot Clogging, Low Flow, No Discharge and Abnormal Noise?
Troubleshooting should separate hydraulic, suction, solids-handling, mechanical, and electrical problems before a pump is replaced.
A symptom alone does not prove that the pump is undersized.
| Symptom | Possible causes to investigate | Field checks | Corrective direction |
| Pump will not start | Power/control issue, motor protection trip, jammed rotating parts | Supply, panel/alarm, motor condition, blockage | Correct electrical/mechanical cause before resizing |
| Runs but no discharge | Empty/failed prime, blocked inlet, closed/restricted line, unsuitable operating condition | Liquid level, inlet, valves, priming condition | Restore flow path or review installation |
| Low flow or low head | Blockage, wear, incorrect duty point, excessive system resistance, low speed | Actual Q/H, piping, impeller condition, system changes | Clean, repair or recalculate duty |
| Long priming time | Air leak, suction restriction, unsuitable lift or piping | Joints, pipe size/length, liquid level | Repair suction system or reconsider arrangement |
| Repeated loss of prime | Air ingress, changing liquid level, inadequate suction margin | Suction piping and liquid-level history | Correct suction system or assess submersible route |
| Cavitation/noise | Unfavorable suction condition, inadequate NPSH margin, blockage | Suction condition, liquid level, flow | Correct hydraulic/suction condition |
| Repeated clogging | Passage mismatch, fibers/rags, sediment buildup | Debris type, impeller, sump bottom | Re-evaluate solids/impeller/pump route |
| Vibration | Hydraulic instability, blockage, mechanical condition, installation issue | Duty point, mounting, rotating parts | Identify source before replacing motor/pump |
For self-priming installations, the suction-lift and piping guide is the logical next diagnostic resource.
Repeated clogging, low flow, or loss of prime may indicate that the original pump arrangement no longer matches the actual wastewater or site conditions. In that case, the right action may be system modification or pump-type reassessment rather than repeated cleaning.
Having a Recurring Pump Problem?
Send the symptom, current pump information, wastewater description, actual or required flow/head, liquid level, and installation details for an engineering review.
Button: Review My Duty Conditions
What Should You Compare Before Requesting a Sewage Pump Quote?
For an industrial project, comparing only initial pump prices can make two quotations look equivalent when the supplied technical scope is not equivalent.
Compare Cost Drivers and Lifecycle Risk, Not Just Purchase Price
Sewage-pump cost is affected by factors such as:
- Pump arrangement
- Hydraulic duty
- Impeller and solids-handling requirements
- Wetted materials
- Motor and protection configuration
- Controls and accessories
- Installation arrangement
- Documentation or project testing requirements
- Spare-parts scope
- Delivery scope
Operating cost is also affected by repeated clogging, cleaning labor, corrosion, pump wear, operation away from the intended duty point, and unplanned shutdowns.
Without real operating data, it is not reasonable to claim a fixed savings percentage or universal service-life improvement.
For procurement-focused information, see the Sewage Pump Buying Guide.
Ask for Engineering Evidence Tied to the Actual Duty Point
Before accepting a proposed pump, ask what technical evidence supports the selection.
Depending on the project, useful documentation can include:
- Performance curve with the selected duty point identified
- Product datasheet
- GA or interface drawing
- Confirmed solids-passage information
- Wetted-material information
- Motor/electrical configuration
- Installation requirements
- Controls and accessories
- Project-specific testing or quality documentation where required
If a project specifies performance testing, ISO 9906 pump performance testing can be used as a reference point for discussing the applicable test requirement. This does not mean every pump or project automatically requires the same testing scope; the requirement should be defined in the project specification.
Use a Complete RFQ Checklist to Reduce Revisions
A useful sewage-pump RFQ should include as much of the following as possible:
Wastewater
- Wastewater source and application
- Solids content, if known
- Maximum particle size
- Fibers, rags, or stringy solids
- Sediment/settling tendency
- Corrosive components, pH, or chemicals if known
- Temperature
Hydraulic duty
- Required flow in GPM or m³/h
- Required head/TDH in ft or m
- Static elevation information
- Piping details if TDH is not yet calculated
Installation
- Submersible, dry-pit, self-priming, inline, or not yet decided
- Pit depth
- Normal/minimum liquid level
- Suction lift for above-ground pumps
- Maintenance and space constraints
Electrical and operation
- Voltage
- Phase
- Frequency
- Continuous/intermittent/emergency duty
- Control and protection requirements
Commercial/project information
- Quantity
- Project location
- Project stage
- Required accessories
- Required drawings/documents
- Target project schedule
Send Your Wastewater Parameters for Pump Selection
Provide wastewater type, solids content, maximum particle size, required flow, TDH/head, installation method, pit depth or suction lift, power supply, duty cycle, and site conditions. Koleburg’s engineering team can review suction feasibility, clogging risk, material/configuration needs, and the suitable sewage-pump route. If your project data are complete, the request can then proceed to quotation.
Button: Submit Duty Conditions
Have a complete RFQ? Submit it together with your duty data for technical confirmation and quotation preparation.
FAQ
Sewage Pump vs. Sump Pump — What Is the Difference?
A sump pump is generally associated with removing collected drainage or groundwater, while a sewage pump is selected for wastewater that may contain solids or other contaminants. The actual distinction should be based on the medium, solids requirements, and application rather than the installation location alone.
Is a Grinder Pump the Same as a Non-Clog Sewage Pump?
No. A grinder pump reduces certain solids before discharge, while a non-clog sewage pump is designed around a solids-handling flow path. The correct choice depends on the wastewater, solids type, discharge system, required head, and project arrangement.
Do Submersible Sewage Pumps Always Need Guide Rails and a Control Panel?
Not in every installation. Guide rails, lifting arrangements, level controls, alarms, and control panels depend on the wet-well configuration, maintenance strategy, operating sequence, motor requirements, and project specification. These items should be defined as part of the complete pump package rather than assumed from the pump type alone.
