Overview
The Irrimec OPTI RAIN ST15 is a professional turbine drive hard hose irrigator designed to deliver reliable, water-powered irrigation across medium to large agricultural fields. Manufactured by Irrimec in Italy, this hard hose reel irrigator utilises a water-powered turbine system to automatically rewind hoses ranging from 82 mm to 125 mm in diameter and lengths from 230 metres to 450 metres, providing flexible coverage for diverse crop types and field configurations. The turbine drive mechanism harnesses water pressure from the irrigation supply itself, eliminating the need for external power sources and making this hose reel irrigator ideal for remote paddocks and areas without reliable electricity access.
What distinguishes the OPTI RAIN ST15 within the turbine drive hard hose irrigator category is its robust TG (turbine-gearbox) transmission system, engineered to provide precise speed control through water flow regulation alone. The integrated by-pass valve allows operators to fine-tune rewinding speed to match field conditions and crop water requirements, while the galvanised steel chassis ensures long-term durability against corrosion in demanding outdoor environments. The ST15's platform design accommodates multiple hose diameter and length combinations, allowing growers to customise the machine to their specific irrigation coverage needs without investing in separate units for different field sizes.
Key Features & Benefits
- Water-Powered Turbine Drive: Eliminates fuel costs and electricity requirements by driving the rewinding mechanism directly from the irrigation water supply — perfect for remote fields and reducing operational expenses to zero beyond water and maintenance.
- Energy-Independent Operation: Operates entirely on water pressure, providing consistent performance without reliance on diesel, petrol, or electrical infrastructure — ideal for properties with limited power access or sustainability objectives.
- Integrated Speed Control: Built-in by-pass valve enables precise adjustment of rewinding speed by regulating water flow through the turbine, allowing operators to match retrieval rate to soil infiltration capacity and prevent runoff.
- TG Gearbox Transmission: Purpose-built turbine-gearbox coupling translates water flow into smooth, controlled rotation with consistent torque across the hose length, ensuring even irrigation application from start to finish.
- Multi-Diameter Hose Compatibility: Accommodates hose diameters from 82 mm to 125 mm across eighteen factory configurations, providing flexibility to match system capacity with water supply, pressure availability, and field dimensions.
- Galvanised Steel Chassis: Hot-dip galvanised steel construction resists corrosion from constant water exposure and harsh agricultural chemicals, extending service life and maintaining structural integrity across decades of seasonal use.
- Low Maintenance Design: Simplified turbine mechanism with fewer moving parts than engine-driven alternatives reduces maintenance intervals, minimises downtime, and lowers long-term ownership costs.
- Quiet Consistent Rewinding: Water-powered operation produces minimal noise compared to engine-driven reels, reducing operator fatigue during long irrigation cycles and making the system suitable for noise-sensitive areas near residential zones.
- Italian Engineering Quality: Manufactured by Irrimec in Italy with precision components and rigorous quality standards, ensuring reliable performance and parts availability through established global distribution networks.
Technical Specifications
| Specification |
Details |
| Manufacturer |
Irrimec |
| Model |
OPTI RAIN ST15 |
| Product Type |
Turbine Drive Hard Hose Irrigator |
| Drive System |
Water-Powered Turbine |
| Turbine Configuration |
TG (Turbine-Gearbox) Direct Drive |
| Transmission Type |
Chain Drive with Gearbox Reduction |
| Speed Control Method |
Integrated By-Pass Valve (Water Flow Regulation) |
| Hose Diameter Range |
82-125 mm (3.23-4.92 in) |
| Hose Length Range |
230-450 m (755-1,476 ft) |
| Maximum Hose Capacity |
125 mm × 270 m (4.92 in × 886 ft) |
| Available Configurations |
18 Factory Hose/Length Combinations |
| Raingun Compatibility |
Medium to Large Volume Rainguns (Model-Specific) |
| Water Inlet Connection |
Flanged Inlet (Size Varies by Model) |
| Chassis Construction |
Galvanised Steel Frame |
| Wheel Configuration |
Agricultural Cart with Ground Wheels |
| Country of Manufacture |
Italy |
Available Hose Configurations
| Model Variant |
Hose Diameter |
Hose Length |
Coverage Type |
| 82 TG |
82 mm (3.23 in) |
450 m (1,476 ft) |
Extended Reach, Lower Flow Applications |
| 90 TG |
90 mm (3.54 in) |
350 m (1,148 ft) |
Mid-Range Coverage, Balanced Performance |
| 90 TG |
90 mm (3.54 in) |
370 m (1,214 ft) |
Mid-Range Coverage, Balanced Performance |
| 90 TG |
90 mm (3.54 in) |
420 m (1,378 ft) |
Extended Coverage, Moderate Flow |
| 90 TG |
90 mm (3.54 in) |
450 m (1,476 ft) |
Maximum 90 mm Reach |
| 100 TG |
100 mm (3.94 in) |
320 m (1,050 ft) |
Higher Flow, Compact Configuration |
| 100 TG |
100 mm (3.94 in) |
350 m (1,148 ft) |
Balanced Flow and Distance |
| 100 TG |
100 mm (3.94 in) |
400 m (1,312 ft) |
Extended 100 mm Coverage |
| 100 TG |
100 mm (3.94 in) |
430 m (1,411 ft) |
Maximum 100 mm Reach |
| 110 TG |
110 mm (4.33 in) |
300 m (984 ft) |
High Flow, Compact Hose Length |
| 110 TG |
110 mm (4.33 in) |
330 m (1,083 ft) |
High Flow, Mid-Range Distance |
| 110 TG |
110 mm (4.33 in) |
350 m (1,148 ft) |
Maximum 110 mm Configuration |
| 120 TG |
120 mm (4.72 in) |
240 m (787 ft) |
Very High Flow, Shorter Pull |
| 120 TG |
120 mm (4.72 in) |
270 m (886 ft) |
Very High Flow, Mid-Range |
| 120 TG |
120 mm (4.72 in) |
300 m (984 ft) |
Maximum 120 mm Reach |
| 125 TG |
125 mm (4.92 in) |
230 m (755 ft) |
Maximum Flow Capacity, Compact Length |
| 125 TG |
125 mm (4.92 in) |
250 m (820 ft) |
Maximum Flow, Mid-Range Distance |
| 125 TG |
125 mm (4.92 in) |
270 m (886 ft) |
Maximum ST15 Flow and Distance |
Performance data including flow rates, pressure requirements, and compatible raingun models vary by configuration. Contact your regional Irrimec distributor or IrriFinder representative for detailed performance charts matching your specific hose diameter and length selection.
Turbine Drive System & Operation
The OPTI RAIN ST15's turbine drive system operates by directing a controlled portion of the irrigation water supply through a turbine assembly flanged directly onto the reduction gearbox. As water flows through the turbine blades, rotational energy is generated and transmitted through the chain drive mechanism to the hose reel drum. Rewinding speed is directly proportional to water flow rate through the turbine — operators adjust retrieval speed by regulating the integrated by-pass valve, which diverts more or less water through the turbine chamber. This creates a simple, mechanical relationship between water pressure and hose retrieval rate, with no electronic controls or sensors required. The system's inherent simplicity means fewer failure points, no calibration drift over time, and intuitive operation that agricultural workers can master within minutes.
The operational advantages of water-powered turbine drive technology become especially apparent in remote field installations and sustainability-focused operations. With zero fuel consumption, the ST15 eliminates recurring diesel or petrol expenses while also reducing carbon emissions to zero at the point of use. The absence of engine noise creates a quieter working environment during extended irrigation cycles, reducing operator fatigue and making the system suitable for properties near residential areas or noise-sensitive zones. Maintenance requirements drop significantly compared to engine-driven alternatives — no oil changes, spark plugs, air filters, or fuel system servicing. Reliability is inherently tied to water pressure consistency rather than mechanical engine condition, meaning performance remains predictable across seasons. For properties with adequate water pressure but limited electrical infrastructure, turbine drive irrigators provide operational independence that matches diesel engines without the fuel logistics or emissions concerns.
Ideal Applications
- Remote Grazing Pastures: Water-powered operation makes the ST15 ideal for irrigation of distant paddocks where electricity access is impractical and fuel transport adds logistical complexity and cost.
- Forage and Hay Production: Long hose runs in 90-110 mm configurations provide cost-efficient irrigation for alfalfa, clover, and grass crops where uniform moisture distribution directly impacts yield and quality.
- Broadacre Row Crops: Suitable for maize, soybean, cotton, and vegetable crops requiring consistent irrigation across large field areas, with hose length flexibility matching diverse field geometries.
- Sports Turf and Golf Courses: Quiet, consistent rewinding operation makes turbine drive systems appropriate for irrigation of sporting facilities where engine noise would be disruptive during daylight operating hours.
- Sustainable Agriculture Operations: Zero fossil fuel consumption aligns with organic certification requirements and carbon reduction goals while maintaining professional irrigation performance standards.
- Mixed Farming Enterprises: Multiple hose configurations allow a single irrigator platform to serve different crops and field sizes across diversified operations, reducing capital investment compared to maintaining separate specialised units.
- Horticultural Production: Precise speed control through by-pass valve adjustment enables tailored irrigation rates for nursery stock, berries, and specialty crops with specific soil infiltration requirements.
