Overview
The Irrimec OPTI RAIN ST8 is a water-powered turbine drive hard hose irrigator designed and manufactured in Italy by Irrimec, a leading specialist in irrigation technology. This hose reel irrigator utilises a turbine drive system that harnesses water pressure from the irrigation supply to rewind the hose automatically, eliminating the need for external power sources or fuel. The OPTI RAIN ST8 accommodates hose diameters ranging from 110 mm to 135 mm and hose lengths from 400 m to 700 m, delivering flexible coverage capacity for medium to large-scale irrigation operations across pasture, row crops, and field applications.
What distinguishes the OPTI RAIN ST8 within the turbine drive hard hose irrigator category is its precision-engineered water turbine flanged directly to a robust gearbox, ensuring reliable chain-driven hose retrieval with minimal mechanical complexity. The integrated turbine system features a built-in by-pass valve that allows fine-tuned speed control proportional to water flow, enabling operators to adjust rewinding pace without external adjustments. The machine is built on a durable chassis with corrosion-resistant treatment, mounted on a stable cart platform designed to withstand demanding field conditions. This combination of energy-independent operation, hydraulic speed regulation, and rugged construction makes the ST8 an efficient choice for irrigators seeking low-maintenance, fuel-free performance in remote paddocks or operations prioritising reduced running costs.
Key Features & Benefits
- Water-Powered Turbine Drive: Eliminates fuel and electricity costs by harnessing irrigation water pressure to drive the rewinding mechanism — ideal for remote fields without access to external power sources, reducing operational expenses and maintenance requirements.
- Integrated By-Pass Valve Speed Control: Built-in valve allows precise adjustment of rewinding speed by regulating water flow through the turbine, enabling operators to match retrieval pace to field conditions and crop requirements without mechanical intervention.
- Chain and Gearbox Transmission: Delivers consistent, reliable torque transfer from the turbine to the hose drum, ensuring smooth hose retrieval even under heavy loads and minimising slippage or inconsistent winding that can damage hose or raingun alignment.
- Wide Hose Capacity Range: Accommodates hose diameters from 110 mm to 135 mm and lengths from 400 m to 700 m, providing flexibility to configure the irrigator for diverse field sizes, crop types, and irrigation depths without requiring multiple machines.
- Energy-Independent Operation: Operates solely on water pressure with no reliance on diesel, petrol, or electric motors, offering complete operational independence from fuel supply chains and eliminating emissions, noise pollution, and engine servicing schedules.
- Durable Chassis Construction: Built on a robust cart platform with corrosion-resistant treatment to withstand continuous exposure to water, soil, and weather extremes, ensuring multi-season longevity and reduced downtime for chassis repairs or replacement.
- Low Maintenance Requirements: Turbine drive systems feature fewer moving parts than engine-driven alternatives, reducing the frequency and cost of servicing, oil changes, belt replacements, and mechanical troubleshooting over the machine's operational life.
- Consistent Retrieval Performance: Rewinding speed remains proportional to water pressure throughout the irrigation cycle, delivering predictable and uniform hose recovery that simplifies operational planning and reduces risk of hose kinking or raingun misalignment.
Technical Specifications
| Specification |
Details |
| Manufacturer |
Irrimec |
| Model |
OPTI RAIN ST8 |
| Product Type |
Turbine Drive Hard Hose Irrigator |
| Drive System |
Water-Powered Turbine |
| Turbine Type |
Flanged Turbine with Integrated Gearbox |
| Transmission |
Chain Drive with Gearbox Reduction |
| Hose Diameter Range |
110-135 mm (4.33-5.31 in) |
| Hose Length Range |
400-700 m (1,312-2,297 ft) |
| Maximum Hose Capacity |
Ø 110 mm × 700 m / Ø 135 mm × 500 m |
| Speed Control Method |
Water Flow By-Pass Valve (Proportional to Pressure) |
| Raingun Compatibility |
Compatible with Medium to Large Bore Rainguns |
| Cart Configuration |
Wheeled Platform with Stabilising Support |
| Water Inlet Type |
Flanged Connection for Mainline Supply |
| Chassis Treatment |
Corrosion-Resistant Coating |
| Country of Manufacture |
Italy |
Available Hose Configurations
| Hose Diameter |
Hose Length |
Compatible Raingun Models |
Nozzle Range |
Performance Data |
| 110 mm (4.33 in) |
580 m (1,903 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 110 mm (4.33 in) |
600 m (1,969 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 110 mm (4.33 in) |
650 m (2,133 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 110 mm (4.33 in) |
700 m (2,297 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 120 mm (4.72 in) |
530 m (1,739 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 120 mm (4.72 in) |
550 m (1,804 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 120 mm (4.72 in) |
600 m (1,969 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 120 mm (4.72 in) |
650 m (2,133 ft) |
Medium to Large Bore |
Contact for specifications |
Contact for performance data |
| 125 mm (4.92 in) |
430 m (1,411 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 125 mm (4.92 in) |
450 m (1,476 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 125 mm (4.92 in) |
520 m (1,706 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 125 mm (4.92 in) |
600 m (1,969 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 135 mm (5.31 in) |
400 m (1,312 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 135 mm (5.31 in) |
450 m (1,476 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 135 mm (5.31 in) |
480 m (1,575 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
| 135 mm (5.31 in) |
500 m (1,640 ft) |
Large Bore |
Contact for specifications |
Contact for performance data |
Turbine Drive System & Operation
The OPTI RAIN ST8 employs a water-powered turbine flanged directly to a precision gearbox, converting irrigation water flow into mechanical energy that drives the chain transmission system and rewinds the hose onto the drum. As water passes through the turbine blades, rotational force is generated proportional to the water pressure and flow rate supplied by the mainline. The integrated by-pass valve enables operators to divert a controlled portion of water flow around the turbine, effectively reducing rotational speed and slowing the rewinding pace without altering mainline pressure or compromising raingun performance. This hydraulic speed regulation provides intuitive, on-the-fly adjustment of retrieval rates to match field topography, crop sensitivity, and desired application depth.
Operational advantages of the turbine drive system centre on energy independence and reduced maintenance burden. With no reliance on diesel engines, petrol motors, or electrical supplies, the ST8 eliminates fuel costs, exhaust emissions, and the noise associated with combustion power units — particularly valuable in remote paddocks far from fuel infrastructure or in environmentally sensitive areas. The turbine mechanism features fewer moving components than engine-driven alternatives, reducing servicing intervals and eliminating the need for oil changes, air filter replacements, spark plug maintenance, or carburetor adjustments. Performance remains consistent and predictable across irrigation cycles, as rewinding speed tracks directly with water pressure, ensuring reliable hose retrieval without the variability introduced by engine throttle settings or mechanical wear. This combination of simplicity, operational independence, and low-maintenance reliability makes the turbine drive system ideal for irrigators prioritising cost efficiency and long-term durability.
Ideal Applications
- Remote Pasture and Rangeland Irrigation: Water-powered operation eliminates dependence on electricity or fuel infrastructure, making the ST8 ideal for distant fields, hillside paddocks, or grazing areas where access to power sources is impractical or cost-prohibitive.
- Forage and Fodder Crop Production: Cost-efficient long hose runs and fuel-free operation reduce per-hectare irrigation expenses for large-scale forage operations, enabling economical supplementary watering of lucerne, clover, and pasture grasses over extended growing seasons.
- Row Crop and Field Crop Irrigation: Consistent hydraulic-controlled rewinding delivers uniform application rates across maize, soybean, cotton, and vegetable fields, supporting precise irrigation scheduling and reducing risk of over- or under-watering that impacts yield and quality.
- Sports Turf and Recreational Fields: Quiet turbine operation and absence of exhaust emissions make the ST8 suitable for golf courses, sports ovals, and public parks where noise pollution and air quality are sensitive considerations, while reliable rewinding ensures uniform turf moisture.
- Horticulture and Orchard Establishment: Precise flow-controlled speed adjustment allows gentle irrigation of young trees, vines, and nursery stock, preventing soil compaction or crop damage from excessively fast raingun travel while maintaining efficient coverage of developing plantations.
- Multi-Paddock Livestock Operations: Energy-independent design suits rotational grazing systems where irrigators are frequently relocated across diverse paddocks, eliminating the logistical complexity of transporting fuel supplies or managing engine maintenance across multiple farm sites.
- Environmentally Sensitive and Organic Farming Systems: Zero emissions and elimination of fuel spillage risk align with organic certification standards and environmental best management practices, supporting sustainable irrigation in conservation areas, wildlife corridors, and farms pursuing low-impact production methods.
