Case History
Self-priming centrifugal pumps with semi-open impeller: the solution for dirty and complex liquids
When it comes to handling liquids containing impurities, suspended solids, fibrous materials, or moderate viscosities, the challenges can be significant. Clogging, frequent breakdowns, and costly maintenance are everyday issues for those using unsuitable technologies.
The solution? Varisco’s self-priming centrifugal pumps with semi-open impeller — J Series and ST-R Series.
Why choose a semi-open impeller pump?
We’re not talking about just any technology, but a robust and reliable solution, with performance ensured by thorough testing and impressive versatility. These pumps can self-prime up to 7.5 meters without the need for a foot valve, allowing for “high and dry” installations far from hazardous or unsanitary environments.
The semi-open impeller allows space for suspended solids, drastically reducing clogging. Maintenance is simple and cost-effective, thanks to front access that enables quick cleaning and part replacement without removing the pump from the system.
Most common applications
The possibilities are numerous. Here are just a few examples:
- Wastewater and light sludge (municipal and industrial)
- Industrial processes with fluids containing debris, foam, and all types of suspensions
- Cleaning and decontamination of industrial systems (pipes, reactors, tanks)
- Extraction and transfer from pits, open tanks, or cisterns
- Wastewater with sand, fibers, oils, or food residues
- Agricultural or livestock slurry
- Flood protection for industrial and residential areas
- Marine applications: on-board handling of heavily polluted bilge water or seawater transfer in ballasting operations
- OEM uses: service on tankers, sprayers, concrete mixers, and machinery for construction or forestry (with hydraulic power supplies)
- Your application: Tell us how you use Varisco pumps — help expand our list of applications!
Case Study
A company in the agri-food sector dealt daily with wastewater containing organic residues. The most frequently reported issue was pump clogging and the constant need for maintenance, which impacted productivity.
The solution? Varisco self-priming pumps with semi-open impeller.
Results:
- Clogging eliminated
- Maintenance time reduced by 40%
- Stable performance despite variations in suspended solids
“Varisco self-priming pumps with semi-open impeller helped us reduce system downtime with extremely fast restarts. Full access to internal components made unclogging easy without disconnecting the pump from the system, resulting in significant cost savings.”
— Technical note from the client
Built to withstand anything
- Materials: cast iron, stainless steel, or mixed combinations
- Electric versions with motors from leading brands (IEC – CEI compliant)
- WEG W22 Premium close-coupled for inverter use, CE, UL, CSA, and EAC certified
- All pump models available in ATEX versions for explosive environments
- Hydraulic power options available for off-road applications
Working with challenging fluids?
Don’t let inadequate technology hold back your productivity. Discover Varisco’s self-priming centrifugal pumps — J Series and ST-R Series — and tell us about your application. Together, we’ll find the perfect pumping solution for your needs.