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ST Series Pumps
End-suction, non-clogging centrifugal pumps for high-flow industrial pumping applications.
The MERAJ ST Series supports wastewater, dewatering, sludge handling, construction, dredging, booster pumping and firefighting applications with multiple mounting and drive configurations.
Built for High-Capacity Performance.
The ST Series covers 9 pump sizes from 4" to 24", with published maximum flows from 1,600 to 32,000 GPM and maximum heads up to 450 ft. The end-suction, non-clogging design supports industrial fluid handling where high flow, solids passage and flexible installation are required.
ST pumps support close-coupled, SAE engine-mount, horizontal frame-mount, vertical and vertical-coupled installations. Hydraulic variable-speed drive is standard to the documented ST configuration, while electric-drive compatibility provides another integration option.
Wide Capacity Range
9 pump sizes from 4" to 24" support different flow, head and solids-handling requirements.
Non-Clog Solids Handling
End-suction, non-clogging construction with a two-vane closed impeller supports fluids containing suspended solids within the specified solids-passage limit.
Dry-Run Capability
Oil-lubricated seals and the ST pump design support documented dry-running operation.
Flexible Integration
Multiple mounting configurations support fixed, engine-mounted, frame-mounted, vertical and project-specific pumping installations.
Choose Your Pump Size
Nine sizes. One ST Series platform.ST 4"
4-inch ST Series pump configuration with published capacity up to 1,600 GPM and maximum head up to 450 ft.
- Suction 4"
- Discharge 4"
- Max. Head 450 ft
- Max. Flow 1,600 GPM
- Max. RPM 2,000
- Max. Power 250 HP
- Impeller 17.5"
- Max. Solid Sphere 3"
ST 6"
6-inch ST Series configuration with published flow capacity up to 3,200 GPM and maximum head up to 300 ft.
- Suction 6"
- Discharge 6"
- Max. Head 300 ft
- Max. Flow 3,200 GPM
- Max. RPM 2,000
- Max. Power 125 HP
- Impeller 14"
- Max. Solid Sphere 3"
ST 8"
8-inch ST Series configuration for higher-volume industrial pumping, with published flow capacity up to 5,225 GPM.
- Suction 8"
- Discharge 8"
- Max. Head 360 ft
- Max. Flow 5,225 GPM
- Max. RPM 1,800
- Max. Power 300 HP
- Impeller 17.5"
- Max. Solid Sphere 3.38"
ST 10"
10-inch ST Series configuration with published flow capacity up to 10,000 GPM and a 4.75-inch maximum solid-sphere rating.
- Suction 10"
- Discharge 10"
- Max. Head 360 ft
- Max. Flow 10,000 GPM
- Max. RPM 1,800
- Max. Power 500 HP
- Impeller 18.5"
- Max. Solid Sphere 4.75"
ST 12"
12-inch ST Series configuration for high-volume industrial transfer, wastewater and dewatering applications.
- Suction 12"
- Discharge 12"
- Max. Head 200 ft
- Max. Flow 10,000 GPM
- Max. RPM 1,800
- Max. Power 250 HP
- Impeller 14"
- Max. Solid Sphere 3"
ST 14"
14-inch ST Series configuration with published flow capacity up to 12,000 GPM for large-volume pumping systems.
- Suction 14"
- Discharge 14"
- Max. Head 120 ft
- Max. Flow 12,000 GPM
- Max. RPM 1,200
- Max. Power 200 HP
- Impeller 17.5"
- Max. Solid Sphere 4"
ST 16"
16-inch ST Series configuration with published flow capacity up to 17,000 GPM and maximum solid-sphere passage of 4.5 inches.
- Suction 16"
- Discharge —
- Max. Head 240 ft
- Max. Flow 17,000 GPM
- Max. RPM 1,200
- Max. Power 500 HP
- Impeller 22"
- Max. Solid Sphere 4.5"
ST 20"
20-inch ST Series configuration for large-volume transfer with published maximum flow up to 24,000 GPM.
- Suction 20"
- Discharge 20"
- Max. Head 140 ft
- Max. Flow 24,000 GPM
- Max. RPM 750
- Max. Power 500 HP
- Impeller 28"
- Max. Solid Sphere 5"
ST 24"
24-inch ST Series configuration provides the highest published flow capacity in the range at up to 32,000 GPM.
- Suction 24"
- Discharge 24"
- Max. Head 140 ft
- Max. Flow 32,000 GPM
- Max. RPM 750
- Max. Power 700 HP
- Impeller 28"
- Max. Solid Sphere 5.25"
Performance
Rated at 700 RPM (UT-2) and 1000 RPM (UT-3)Operating Points
| Model | Flow (GPM) | Head (ft.) |
|---|---|---|
| UT-2 | 150 | 100 |
| UT-2 | 130 | 230 |
| UT-2 | 110 | 335 |
| UT-3 | 360 | 100 |
| UT-3 | 225 | 254 |
Performance Curve
Ideal For
- Fuel transfer
- Water transfer
- Dewatering
- Firefighting support
- Auxiliary systems
ST Series Performance
Published maximum ratings across all 9 ST Series pump sizes.
ST 4"
ST 6"
ST 8"
ST 10"
ST 12"
ST 14"
ST 16"
ST 20"
ST 24"
ST Series Technical Data
| Size | Max. Head | Max. Flow | Max. RPM | Max. Power | Impeller | Max. Solid Sphere |
|---|---|---|---|---|---|---|
| 4" | 450 ft | 1,600 GPM | 2,000 | 250 HP | 17.5" | 3" |
| 6" | 300 ft | 3,200 GPM | 2,000 | 125 HP | 14" | 3" |
| 8" | 360 ft | 5,225 GPM | 1,800 | 300 HP | 17.5" | 3.38" |
| 10" | 360 ft | 10,000 GPM | 1,800 | 500 HP | 18.5" | 4.75" |
| 12" | 200 ft | 10,000 GPM | 1,800 | 250 HP | 14" | 3" |
| 14" | 120 ft | 12,000 GPM | 1,200 | 200 HP | 17.5" | 4" |
| 16" | 240 ft | 17,000 GPM | 1,200 | 500 HP | 22" | 4.5" |
| 20" | 140 ft | 24,000 GPM | 750 | 500 HP | 28" | 5" |
| 24" | 140 ft | 32,000 GPM | 750 | 700 HP | 28" | 5.25" |
Maximum Flow by Pump Size
Note: Values shown are based on published operating points.
Applications
Sewer & Wastewater
Non-clogging pumping for sewer systems and wastewater-transfer applications.
Construction Dewatering
High-volume removal and transfer of water from construction sites, excavations and temporary works.
Sludge Handling
Fluid handling for applications involving suspended solids and sludge within the specified solids-passage capacity.
Dredging
Pumping support for dredging and related large-volume fluid-transfer applications.
Industrial Transfer
High-flow pumping for process-water transfer, bypass duties and industrial fluid movement.
Firefighting & Booster Systems
ST pumps can serve firefighting and booster-pump applications and can be directly integrated into pipelines.
Drive & Installation Options
Configure the ST Series around the operating environment and installation method.
- Hydraulic Variable-Speed DriveHydraulic drive allows variable-speed pump operation to match system requirements.
- Electric Drive CompatibilityST Series pumps can be configured for electric-drive applications where required.
- Multiple Mounting ConfigurationsClose-coupled, SAE engine-mount, horizontal frame-mount, vertical and vertical-coupled configurations are available.
Materials & Construction
Material and internal-component options support industrial pumping environments.
- Iron or CD4MCu ConstructionST Series pumps are available in Iron or CD4MCu stainless steel.
- Corrosion-Resistant Material OptionMERAJ states that CD4MCu provides corrosion resistance equal to or better than 316 stainless steel while providing approximately double the yield strength.
- Two-Vane Closed ImpellerA two-vane closed impeller supports the ST Series non-clogging and solids-handling design.
- Oil-Lubricated SealsOil-lubricated seals support the documented dry-running capability of the ST Series.
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Need Help Selecting an ST Pump?
Choose the right ST pump size based on required flow, head, solids passage, drive method and installation configuration.
After-Sales Support
Support Beyond Delivery
Keep your MERAJ pump supported throughout its service life.
MERAJ provides after-sales assistance for pump systems through its technical teams and service-partner network. Engineering records and product documentation help support maintenance, troubleshooting, replacement parts, and long-term pump operation.
Technical Support
Get technical assistance for pump operation, system troubleshooting, installation, and service requirements.
Service Network
Access support through MERAJ service teams and service partners when pump inspection, maintenance, or technical assistance is required.
Spare Parts Support
Get support for replacement pump components and compatible parts using available product and engineering records.
Maintenance Assistance
Receive service guidance to help maintain pump performance, system condition, and dependable operation throughout the product lifecycle.
