Product Overview
The GR55-SMT16B-300L is a three-screw pump from Italy’s Settima Meccanica GR Series. Settima was founded in 1978 and is headquartered in Piacenza, Italy, and is a globally renowned manufacturer of three-screw pumps. Settima is ISO 9001 certified, and the SMT16B Series pumps feature ATEX certification.
This unit features SMT16B short-screw compact design with a flow rate of 300 L/min (@ 3000 rpm). The GR Series three-screw pumps are known for ultra-low noise, pulsation-free output, and long service life, making them ideal for a wide range of low-pressure lubrication, cooling, and fluid transfer applications. The pump body and screw design eliminate any axial loads.
Key Interchangeability Advantage: Our GR series three-screw pumps are manufactured to strict Italian Settima original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (ISO 3019/2 flanges), shaft configurations, and port connections (SAE 3000) are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions, guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on Settima GR SMT16B Series designation rules):
GR = Series: Three-Screw Pump
55 = Size code (Group GR55)
SMT16B = Body type: Short-screw compact
300L = Rated flow: 300 L/min (@ 3000 rpm)
Technical Specifications
GR55-SMT16B-300L
Product Series: GR Series Three-Screw Pump
Brand: Settima Meccanica (Italy)
Pump Type: Three-screw pump, SMT16B short-screw compact
Rated Flow (@3000 rpm): 300 L/min
Rated Flow (@1500 rpm): Approx. 150 L/min
Maximum Continuous Operating Pressure: 40 bar
Peak Pressure: 50 bar
Speed Range: 500 – 3600 rpm
Inlet Pressure: -0.7 to 3 bar abs
Noise Level: 52 – 68 dB(A) (@ 2950 rpm)
Shaft Type: 32 mm external diameter
Mounting Flange: ISO 3019/2, pilot diameter 160 mm
Direction of Rotation: Right-hand (clockwise) (viewed from shaft end)
Port Connections: SAE 3000
Housing Material: Extruded aluminum alloy
Screw Material: Primary screw C25 steel, idler screws cast iron
Seals: Standard FKM, optional NBR / EPDM
Mounting Position: Any
Submersible Option: Dry (SMT16B) or submersed (SMIT16B)
Ambient Temperature Range: -20°C to +60°C
Fluid Temperature Range: -20°C to +180°C (seal-dependent)
Media Viscosity Range: 2 – 10,000 cSt
Filtration Requirement: NAS 1638 Class 8 or ISO 4406 17/14
ATEX Certification: Optional
Key Technical Advantages
1. Precision Three-Screw Meshing Design for Zero Pulsation Output
The GR Series features precision meshing between the main screw and two idler screws, delivering smooth axial fluid flow. The smooth meshing tooth surfaces of the rotors enable pulsation-free fluid flow, fundamentally eliminating pressure pulsation with no oil trapping. This characteristic makes it the ideal choice for lubrication and cooling systems with stringent flow stability requirements.
2. Ultra-Low Noise Operation (52 – 68 dB(A))
Through advanced screw geometry design and high-precision machining processes, the GR Series three-screw pumps achieve extremely low noise levels. The SMT16B pump delivers acoustic emissions of only 52 – 68 dB(A) at 2950 rpm. Compared to standard gear and vane pumps, noise is reduced by an average of 15 dB(A) . The low-noise characteristic makes it particularly suitable for indoor equipment, elevators, hospitals, and laboratories with strict noise requirements.
3. Axial Load-Free Design for Extended Service Life
The pump body and screw design eliminate any axial loads. Functional pressure develops tolerance between the balancing piston of the main screw and the surrounding body, creating a balancing hydrodynamic force on the screws while lubricating and cooling the sealing components. The torque needed to move the lateral screws is transmitted hydraulically by the pumped fluid – the screws rotate with no possibility of mechanical wearing. This unique design ensures exceptionally long service life and high reliability.
4. Extremely Wide Media and Temperature Adaptability
The GR Series three-screw pumps can handle an exceptionally wide viscosity range, from 2 cSt low-viscosity fluids to 10,000 cSt high-viscosity media. The operating temperature range covers -20°C to +180°C. This characteristic makes them widely applicable to mineral oils, synthetic oils, lubricating oils, fuel oils, thermal oils, and HFA/HFB/HFC/HFD hydraulic fluids.
5. Modular Design for Flexible Configuration
The SMT16B Series pumps support both dry (SMT16B) and submersed (SMIT16B) installation. Supports ISO 3019/2 standard flanges and IEC standard direct motor mounting. Multiple seal options available (NBR/FKM/EPDM). The GR55-SMT16B-300L also supports AC Series direct motor mounting configurations (e.g., AC28-B5). Extensive configuration options ensure precise matching to diverse application requirements.
Application Areas
Equipment Forced Lubrication Systems: Lubricating oil supply for gearboxes, compressors, fans, generator sets, wind turbine gearboxes
Cooling and Filtration Systems: Large cooling circuits, filtration system circulation pumps, industrial chiller units
Wind Power: Wind turbine gearbox lubrication and cooling systems
Marine and Offshore Engineering: Marine gearbox lubrication, fuel transfer pumps
Metallurgy and Mining: Coal mill oil supply pumps, rolling mill lubrication systems, hot rolling continuous casting hydraulic circulation
Power Generation and Power Plants: Turbine lubrication systems, power plant auxiliary oil pumps
Elevators and Lifting Equipment: Hydraulic elevators, lift platforms
Plastics and Rubber Industry: Injection molding machine hydraulic systems
Machine Tools and Industrial Equipment: Machine tool lubrication, low-pressure hydraulic power units
Cleaning and Dust Suppression Equipment: High-pressure cleaning vehicles, dust suppression vehicles
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete GR55-SMT16B-300L model breakdown: GR (series), 55 (size), SMT16B (short-screw compact), 300L (300 L/min @ 3000 rpm).
For higher flow rates, select GR55-SMT16B-380L; for different mounting configurations, select suffixes such as AC28-B5.
SMT16B Series maximum continuous pressure is 40 bar, peak 50 bar. For higher pressure requirements, select Settima high-pressure series.
2. Rotation Direction Confirmation
3. First Start-Up & Media Priming
Prime the pump housing with clean media before first start-up; ensure suction line is fully filled – never run dry.
Inlet pressure must be maintained within -0.7 to 3 bar abs.
Maintain operating temperature within -20°C to +180°C.
Speed range: 500 – 3600 rpm.
4. Filtration Requirements
Recommended filtration: NAS 1638 Class 8 or ISO 4406 17/14.
Three-screw pumps have specific fluid cleanliness requirements – regularly monitor fluid quality to prevent contaminants from accelerating screw and bushing wear.
5. Operating Monitoring
Three-screw pumps are known for pulsation-free, low-noise operation – if abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Continuous operating pressure must not exceed 40 bar; peak pressure must not exceed 50 bar.
No axial or radial loads are permitted on the drive shaft.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
