The Franklin Electric FMIT Series Frame Mount Self-Priming Pump is a heavy-duty centrifugal pump engineered for high-flow irrigation, construction dewatering, mining, and industrial water transfer applications where reliable self-priming performance and the ability to handle water carrying mud, sand, and silt are non-negotiable. Available in three model sizes, FMIT-20, FMIT-30, and FMIT-40, the FMIT Series delivers progressively higher flow capacity within the same rugged cast iron platform. At Ken’s Distributing Company, we stock the full FMIT lineup and ship fast so your operation does not lose time waiting on equipment.
What Is the Franklin Electric FMIT Series Frame Mount Self-Priming Pump?
The FMIT is Franklin Electric’s high-capacity frame mount self-priming centrifugal pump, designed specifically for applications that push beyond what smaller self-priming pumps can handle. The model numbers tell you the story: FMIT-20, FMIT-30, and FMIT-40 represent increasing flow capacity within the series, making the FMIT the right choice when you need serious water volume moved reliably in conditions that are not always ideal.
What distinguishes the FMIT from standard frame mount centrifugal pumps is the combination of self-priming capability and a semi-open non-clogging impeller that handles mud, sand, and silt up to 10% by volume. That 10% solids tolerance is a meaningful specification. It means this pump can work in real agricultural, construction, and mining environments where the water source contains suspended material without requiring pre-filtering or constant cleaning of the impeller.
The frame mount design separates the pump end from the drive source, allowing the FMIT to be powered by an electric motor, gas engine, belt drive, or PTO shaft depending on what is available at your installation site. This drive flexibility, combined with self-priming capability and solids handling, makes the FMIT one of the most versatile pumps in the Franklin Electric lineup.
Kendisco is an authorized Franklin Electric distributor. Every FMIT pump ordered through Ken’s Distributing Company is a genuine Franklin Electric product with full manufacturer support and access to genuine replacement parts.
Technical Specifications
Volute Material: Cast Iron with tapped openings for priming, venting, and draining
Impeller Type: Semi-Open Cast Iron, Non-Clogging
Solids Handling: Mud, sand, and silt up to 10% by volume
Seal: Carbon/Ceramic faces, Viton elastomers, 300 Series Stainless Steel
Bearing Frame: Heavy duty with sealed bearings, keyed stainless shaft, replaceable wear plate
Drive Compatibility: Belt drive and direct drive
Connection Type: Threaded FNPT suction and discharge
Rotation: Clockwise facing the shaft (all models)
Order Information
FMIT Series Frame Mount Self-Priming Pump
| Item |
Model |
Seal |
Suction |
Discharge |
Rotation |
| 90230002 |
FMIT-20 |
Mechanical Seal |
Threaded – FNPT |
Threaded – FNPT |
Clockwise facing the shaft |
| 90230003 |
FMIT-30 |
Mechanical Seal |
Threaded – FNPT |
Threaded – FNPT |
Clockwise facing the shaft |
| 90230004 |
FMIT-40 |
Mechanical Seal |
Threaded – FNPT |
Threaded – FNPT |
Clockwise facing the shaft |
FMIT Model Size Comparison: 20, 30, and 40
The three FMIT models represent scaling flow capacity within the same platform. All three share identical construction materials, seal specifications, drive compatibility, and connection types. The difference is in the hydraulic size of the pump end, which determines the flow rate and pressure curve for each model.
| Model |
Relative Flow Capacity |
Best Application Scale |
Self-Priming |
Solids Handling |
| FMIT-20 |
Moderate high flow |
Medium irrigation, construction dewatering |
Yes |
Up to 10% by volume |
| FMIT-30 |
High flow |
Large irrigation, municipal transfer |
Yes |
Up to 10% by volume |
| FMIT-40 |
Highest flow in series |
Large-scale agriculture, mining, industrial |
Yes |
Up to 10% by volume |
Contact Ken’s Distributing at 303.699.7845 for specific performance curve data on each FMIT model so you can match the right size to your GPM and head requirements before ordering.
How the FMIT Self-Priming System Works
The FMIT uses a large-volume cast iron priming chamber in the volute that retains liquid between pump cycles. When the pump starts after a shutdown, this retained liquid creates a low-pressure zone on the suction side that pulls air out of the suction line and draws water up from the source until full centrifugal flow is established.
The tapped priming port on the volute lets you fill the housing for the initial startup. After that first fill, the priming chamber retains enough liquid to restart the priming cycle automatically on every subsequent start without any operator involvement. The venting port allows air to escape during priming, and the drain port gives you complete housing drainage for winterizing or servicing without disconnecting piping.
For water truck applications and irrigation systems that cycle on and off throughout a work shift, this automatic restart capability is a practical advantage that reduces operator workload and eliminates the downtime that manual priming would otherwise cause.
Construction Details
Volute
The rugged cast iron volute includes tapped openings for priming, venting, and draining built into the body. Cast iron construction provides the durability and pressure-handling capability needed for the higher flow rates and continuous-duty operation that the FMIT-30 and FMIT-40 models are designed for. The volute is engineered to handle the solids content the FMIT is rated for without erosion damage over normal service intervals.
Impeller
The semi-open cast iron impeller is the key to the FMIT’s solids handling capability. With one open shroud face, the impeller allows mud, sand, and silt particles up to the 10% by volume rating to pass through without getting trapped and clogging the pump. This is the specification that separates the FMIT from standard centrifugal pumps that choke on dirty water. For agricultural irrigation from ponds, canals, and open water sources, and for construction dewatering in excavations with sediment-laden water, this impeller design keeps the pump running when others would be stopping for cleaning.
Mechanical Seal
The carbon and ceramic mechanical seal with Viton elastomers and 300 Series stainless steel hardware is the same high-specification seal used in the FBSTF Series. Viton elastomers provide better chemical resistance than BUNA or Nitrile, making the FMIT seal durable in fertilizer solutions, mildly acidic water, and higher-temperature applications that would degrade standard seal materials prematurely. The mechanical seal creates a positive, no-adjustment seal at the shaft penetration point.
Bearing Frame
The heavy-duty bearing frame uses sealed bearings that resist contamination from the field and construction site environments where the FMIT is most often used. The keyed stainless shaft provides a secure, corrosion-resistant connection to both the impeller and the drive source. The replaceable wear plate is a particularly useful feature. As the pump processes water with sand and silt, the wear plate takes the abrasion rather than the volute or impeller. When the wear plate reaches the end of its service life, it is replaced as an individual component, restoring pump efficiency without replacing the entire pump end.
Applications and Industries
The FMIT Series handles a wide range of demanding applications where high flow, self-priming, and solids tolerance are all needed together.
- Agricultural Irrigation: Large-scale field irrigation from ponds, rivers, canals, and open water sources is the primary application for the FMIT-30 and FMIT-40 models. The semi-open impeller handles the silt and organic debris common in agricultural water sources without clogging, and the self-priming design manages the start-stop cycles of automated irrigation systems without operator intervention.
- Construction Dewatering: Excavation dewatering involves sediment-laden water that would clog standard pumps quickly. The FMIT handles this water reliably, and the self-priming capability means the pump can be left to operate unattended during overnight dewatering of deep excavations.
- Mining: Mining site water management involves high-sediment water that demands a pump built for abrasion resistance and solids handling. The cast iron construction and semi-open impeller with 10% solids tolerance handle mining site conditions better than standard centrifugal pumps.
- Water Truck Service: The FMIT is used on water trucks for dust control, road building, and construction site water delivery where high flow rates and reliable self-priming operation are needed across long work shifts.
- Municipal Water Transfer: Municipalities use the FMIT for emergency pumping, water main bypass operations, and park irrigation where high flow and self-priming reliability are both required.
- Commercial: Large commercial irrigation systems, golf courses, and commercial properties with high water demand use the FMIT where smaller self-priming pumps cannot deliver the required flow volume.
- Light Industrial: Industrial facilities use the FMIT for liquid transfer, cooling water supply, and process water movement where the water may carry suspended solids and high flow rates are needed.
Features and Benefits
- 10% Solids Tolerance by Volume: The semi-open non-clogging impeller handles mud, sand, and silt up to 10% by volume. This is a specific, quantified capability that makes the FMIT genuinely useful in real agricultural, construction, and mining water conditions.
- Self-Priming with Automatic Restart: After the initial housing fill, the FMIT handles every restart automatically without manual priming. For applications with repeated start-stop cycles throughout a work shift, this is a meaningful operational advantage.
- Replaceable Wear Plate: The wear plate absorbs abrasion from sand and silt rather than the volute or impeller. When it wears out, replace the plate alone rather than the entire pump end. This extends the service life of the pump significantly in high-solids applications and reduces the cost of maintaining the pump in abrasive water conditions.
- Viton Elastomer Mechanical Seal: Better chemical and temperature resistance than standard BUNA or Nitrile elastomers. Suitable for fertilizer solutions and mildly aggressive water chemistry common in agricultural applications.
- Heavy Duty Sealed Bearings: Sealed bearings resist contamination in field and construction environments where dust, moisture, and abrasive particles would degrade open bearing configurations rapidly.
- Belt Drive and Direct Drive Compatibility: Power the FMIT from an electric motor, gas engine, or PTO shaft. The frame mount bearing frame supports both drive configurations without modification.
- Three Model Sizes: FMIT-20, FMIT-30, and FMIT-40 provide progressively higher flow capacity within the same platform. Scale up within the series as your application demands grow without changing your drive setup or piping significantly.
- Tapped Volute Ports: Priming, venting, and draining ports in the cast iron volute body make commissioning and seasonal service straightforward without disconnecting installed piping.
FMIT vs. FBSTF: Choosing the Right Frame Mount Self-Priming Pump
Both the FMIT and FBSTF are Franklin Electric frame mount self-priming centrifugal pumps with cast iron construction, Viton mechanical seals, and semi-open impellers. The key differences come down to solids handling specification, the availability of a replaceable wear plate, and flow capacity range.
| Feature |
FMIT Series |
FBSTF Series |
| Solids Handling |
Mud, sand, silt up to 10% by volume |
Light solids and debris |
| Wear Plate |
Replaceable wear plate included |
Standard volute without wear plate |
| Model Range |
FMIT-20, FMIT-30, FMIT-40 |
FBSTF-1, FBSTF-2 |
| Flow Capacity |
Higher flow at larger model sizes |
Moderate flow capacity |
| Seal Elastomer |
Viton |
Viton |
| Drive Options |
Belt and direct drive |
Belt and direct drive |
| Self-Priming |
Yes |
Yes |
| Best For |
High-solids, high-flow applications |
Moderate solids, moderate flow |
If your application involves water with significant mud, sand, or silt content and you need high flow capacity, the FMIT is the stronger choice. If your solids content is lighter and your flow requirements are more moderate, the FBSTF may be the right fit at a lower cost point. Call Ken’s Distributing at 303.699.7845 and we will help you choose based on your specific water quality and flow requirements.
Installation and Compatibility
- Initial Priming: Fill the pump housing through the tapped priming port before the first startup. Use the venting port to bleed air from the housing during fill. After this initial fill, the self-priming design handles every subsequent restart automatically.
- Suction Line: Install a foot valve at the water source to help maintain liquid in the suction line between pump cycles. Keep the suction line as short and direct as possible with minimal bends to maximize available NPSH for reliable self-priming performance at all three model sizes.
- Discharge Line: Connect to the threaded FNPT discharge port. Match your pipe diameter to the discharge port size. Install a check valve on the discharge side to prevent backflow when the pump shuts down.
- Drive Setup: For belt drive installations, size pulleys to achieve the correct pump RPM for your flow and head requirements. Ensure proper belt tension and alignment before startup. For direct drive, align the coupling carefully before running. Drive misalignment is the primary cause of premature bearing failure on frame mount pumps.
- Rotation Direction: All three FMIT models rotate clockwise when facing the shaft. Confirm your drive source rotation before connection.
- Mechanical Seal Protection: Never run the FMIT dry. The Viton mechanical seal requires liquid at the seal faces for lubrication and cooling at all times during operation.
- Wear Plate Inspection: Inspect the replaceable wear plate at regular service intervals, especially in high-solids applications. Replace the wear plate when clearance between the impeller and plate exceeds the manufacturer specification to maintain pump efficiency.
- Winterizing: Use the drain port on the volute to completely empty the pump housing before freeze conditions. Trapped water in a cast iron volute can cause cracking when it freezes.
Replacement Parts and Service
The replaceable wear plate is the single most important service feature of the FMIT Series for applications involving abrasive water with sand and silt. By absorbing the abrasion that would otherwise wear the volute and impeller, the wear plate extends the working life of the pump significantly. Replacing the wear plate periodically is far less expensive than replacing the entire pump end.
Ken’s Distributing Company carries genuine Franklin Electric FMIT Series replacement parts including wear plates, mechanical seals, semi-open impellers, and bearing components. When service is needed, call us at 303.699.7845 and we will identify the correct part by model number and get it shipped fast.
Browse our Franklin Electric replacement parts and repair kits for the FMIT Series and all other Franklin Electric pump lines.
Frequently Asked Questions
What does FMIT stand for in Franklin Electric pump naming?
FMIT refers to Franklin Electric’s frame mount self-priming centrifugal pump series with threaded connections, designed for high-flow irrigation, construction, mining, and industrial applications. The model number suffix (20, 30, 40) indicates the relative flow capacity of each size within the series.
How much solids can the FMIT handle?
The FMIT semi-open impeller is rated to handle mud, sand, and silt up to 10% by volume. This is a significant solids handling capability that allows the pump to work in agricultural, construction, and mining water sources without the clogging that would disable a standard enclosed impeller centrifugal pump.
What is the replaceable wear plate on the FMIT and why does it matter?
The replaceable wear plate sits between the impeller and the volute. In applications with abrasive water carrying sand and silt, the clearance between the impeller and this plate gradually increases as abrasion occurs. When that clearance gets too large, pump efficiency drops. Replacing the wear plate restores the original clearance and efficiency at a fraction of the cost of replacing the entire pump end. This feature makes the FMIT a much more economical pump to maintain in long-term high-solids service.
Is the FMIT pump self-priming?
Yes. The FMIT Series is self-priming after the initial housing fill. Fill the volute through the tapped priming port before first startup. After that, the retained liquid in the priming chamber allows the pump to automatically draw water up from the source on every subsequent restart without manual intervention.
What is the difference between FMIT-20, FMIT-30, and FMIT-40?
The three FMIT models represent progressively larger hydraulic pump ends with increasing flow capacity. All three use identical construction materials, Viton mechanical seals, clockwise rotation, and the same drive compatibility. The choice between them depends on your required GPM and head. Call Ken’s Distributing at 303.699.7845 for specific performance data to match the right model to your system requirements.
What drive types work with the FMIT Series?
The FMIT bearing frame supports belt drive and direct-coupled configurations. It can be powered by an electric motor, gas engine, or PTO shaft with appropriate coupling hardware. All three models rotate clockwise when facing the shaft.
Can I get FMIT replacement parts from Kendisco?
Yes. Ken’s Distributing Company carries genuine Franklin Electric FMIT Series replacement parts including replaceable wear plates, Viton mechanical seals, semi-open impellers, and bearing components. Call 303.699.7845 for parts availability and fast shipping.
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