Manufacturer of energy-efficient submersible mixers, vertical agitators and mixing systems for biogas, wastewater and process engineering
streisal GmbH
Wangen im AllgäuNew on Amplifa
About us
streisal GmbH is a medium-sized, independent German manufacturer of energy-efficient agitators and mixing systems based in Wangen im Allgäu. Founded in 1988, the company develops and manufactures submersible mixers (1–18.5 kW), slow-running large-blade agitators with propellers up to 2,650 mm in diameter, vertical and inclined agitators (1–30 kW), large-propeller mixing systems (Maischebull®/Hydrobull®) as well as switchgear and control units including frequency converters and monitoring systems. Production is predominantly in stainless steel (1.4301, 1.4571, 1.4057) with housings in GG25 cast iron and motor shafts in tempered steel; mechanical seals are made of highly wear-resistant silicon carbide. The product range also includes in-house manufactured installation accessories such as mounting assemblies, guide rails, stand units and lowering devices. For design calculations, streisal operates a fluid mechanics laboratory with metrology and model systems as well as a large-scale test tank and a load test bench. Fields of application are biogas plants, municipal and industrial wastewater treatment, industrial process engineering, agriculture and water supply; explosion-proof versions are approved under ATEX, CSA/UL and IECEx and are in operation worldwide.
- Site
- Wangen im Allgäu
- Processes
- Submersible mixers (1–18.5 kW), Submersible mixer TSR (with gear reduction, 1.5–18.5 kW), Submersible mixer TSR with CSA/UL (7.5–16 kW), TSRL hybrid submersible mixer (7.5/11 kW, for highly viscous liquids), Slow-running submersible mixers ATP/BTP (1.5–11 kW), Compact direct-drive submersible mixer TRV (1.1 kW), Vertical/inclined agitators (1–30 kW), Maischebull® / Hydrobull® large-propeller mixing systems (11–30 kW)
- Materials
- Stainless steel 1.4301 (V2A), Stainless steel 1.4571 (V4A), Stainless steel 1.4057, Stainless steel investment casting 1.4308, Stainless steel 1.4104, Steel 1.7225, GG25 (cast iron), Silicon carbide (mechanical seal)
- Certificates
- ATEX, CSA/UL, IECEx, ISO 21630 (pumping capacity, measurement)
- Founded
- 1988
- Industries
- Biogas plants, Wastewater treatment (municipal and industrial), Industrial process engineering, Agriculture, Water supply
- 01
Consulting and design (fluid mechanics laboratory)
- 02
Engineering and custom manufacturing
- 03
Manufacture of agitators and installation accessories
- 04
Assembly and commissioning
- 05
Maintenance, servicing, spare parts, repowering
Materials & Processes
Stainless steel 1.4301 (V2A)
Housings, propellers, carriages and connecting elements of the submersible mixers; corrosion-resistant against aggressive media.
Stainless steel 1.4571 (V4A)
Gas-exposed components and agitator shafts for particularly corrosive media as in biogas digesters.
Stainless steel 1.4057
Drive shafts of the vertical and inclined agitators.
Stainless steel investment casting 1.4308
Bearing shields of the compact submersible mixer TRV.
Stainless steel 1.4104
Propeller shaft of the TRV submersible mixer.
Steel 1.7225
Motor shafts of the submersible mixers, not in contact with media.
Cast iron GG25
Housings of the TSR, TSRL, ATP/BTP submersible mixers and bearing brackets of the vertical agitators.
Silicon carbide
Highly wear-resistant mechanical seals (streisal Seal Guard) for abrasive and fibrous media.
High-strength polymer with steel core
Large ATP propellers (Ø 2,300–2,650 mm) of the Maischebull®/Hydrobull® mixing systems, wear-free.
Fluororubber (Viton) / Perfluoroelastomers
Sealing elastomers in the TRV for sticky, highly aggressive and abrasive media.
Sites
Wangen im Allgäu
DEHeadquarters, development, manufacturing, laboratory and service
- Part weight / size
- Agitators up to approx. 1,500 kg (Maischebull®/Hydrobull®)
- Lot size
- Custom and small series, individual configurations based on a modular system
- Materials
- Stainless steel 1.4301/1.4571/1.4057, GG25, steel 1.7225, silicon carbide, polymers
- Fluid mechanics laboratory with metrology and model systems
- Large-scale test tank
- Load test bench for submersible mixers with grid power feedback (2019)
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Submersible mixers (1–18.5 kW)Engineering | – | – | – | – | Stainless steel, GG25, Silicon carbide |
| Submersible mixer TSR (with gear reduction, 1.5–18.5 kW)Engineering | – | – | 255 kg | – | Stainless steel 1.4301, GG25, 1.7225, Silicon carbide |
| Submersible mixer TSR with CSA/UL (7.5–16 kW)Engineering | – | – | 242 kg | – | Stainless steel 1.4301, GG25, 1.7225, Silicon carbide |
| TSRL hybrid submersible mixer (7.5/11 kW, for highly viscous liquids)Engineering | – | – | 300 kg | – | Stainless steel 1.4301, GG25, 1.7225, Silicon carbide |
| Slow-running submersible mixers ATP/BTP (1.5–11 kW)Engineering | – | – | 310 kg | – | Stainless steel 1.4301, Stainless steel 1.4571, GG25, 1.7225, Silicon carbide, Polymer |
| Compact direct-drive submersible mixer TRV (1.1 kW)Engineering | – | – | 28.5 kg | – | Stainless steel 1.4301, Stainless steel investment casting 1.4308, 1.4104, Silicon carbide, Viton, Kalrez/Parafluor |
| Vertical/inclined agitators (1–30 kW)Engineering | – | – | – | – | Stainless steel 1.4301, Stainless steel 1.4571, Stainless steel 1.4057, Steel, GG25, Polymer |
| Maischebull® / Hydrobull® large-propeller mixing systems (11–30 kW)Engineering | – | – | approx. 1100 kg – approx. 1500 kg | – | Stainless steel 1.4571, Stainless steel 1.4301, Polymer, Steel, Silicon carbide |
| Manufacture of installation accessories (supports, guide rails, stand units,Assembly | – | – | – | – | Stainless steel |
| Switchgear, starter and control units incl. frequency converters, SafeGuard, SafeBoxEngineering | – | – | – | – | – |
| Assembly, commissioning, repair, maintenance and servicing of agitatorsAssembly | – | – | – | – | – |
| Reproduction of spare parts from the drawing archiveAssembly | – | – | – | – | – |
| Repowering drilling technology: retrofitting of mounting assemblies with the vessel filled (patentedAssembly | – | – | – | – | – |
| Planning, design and consulting for agitator technology; fluid mechanics laboratory and test tankEngineering | – | – | – | – | – |
| Explosion-proof agitators (ATEX, CSA/UL, IECEx)Engineering | – | – | – | – | – |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Fluid mechanics laboratory with metrology and model systems | streisal | – | – | – | Wangen im Allgäu |
| Large-scale test tank | streisal | – | – | – | Wangen im Allgäu |
| Load test bench for submersible mixers with grid power feedback | streisal | – | – | 2019 | Wangen im Allgäu |
Additional services
Reference customers
Quality
According to its own statements, streisal manufactures quality “Made in Germany” with high-quality components and precision; the design is carried out in the company's own fluid mechanics laboratory and in the large-scale test tank, with final testing of the submersible mixers on the load test bench with grid power feedback (since 2019). The agitators come as standard with temperature monitoring in the motor winding as well as seal monitoring (leakage probe Toplimiter, optionally tandem).
| Evidence | Wangen im Allgäu |
|---|---|
| ATEX | |
| CSA/UL | |
| IECEx | |
| ISO 21630 (pumping capacity, measurement) |