Breathing air compressor SILENT HD 450 ET, filling capacity 450 liters/min, max. 420 bar Neue Kollektion

Breathing Air Compressor SILENT HD 450 ET with 450 l/min

The Coltri Silent 450 ET is a soundproofed high-pressure breathing air compressor from the Heavy Duty Line and has been developed for professional filling stations with high air demand. Thanks to the fully insulated enclosure, noise emissions are significantly reduced, allowing the compressor to be used in working environments with stricter noise control requirements. The operating sound pressure level is below approximately 70 dB, which is exceptionally quiet for this performance class.

With a delivery rate of 450 l/min (27 m³/h), the Silent 450 ET is ideal for dive centers, respiratory protection workshops, industrial applications, or central filling stations where high filling capacity and continuous operation are required. The system features four front-mounted high-pressure filling connections, allowing multiple cylinders to be filled simultaneously.

The powerful 4-stage compressor unit with forced lubrication ensures high efficiency and long service life even under intensive operation. In combination with the dual Hyperfilter system, reliable air purification is achieved and breathing air quality according to DIN EN 12021 is ensured.

With its robust construction, integrated control panel, and numerous safety and monitoring systems, the Silent 450 ET is designed for professional continuous operation and offers a powerful solution for demanding applications.

Technical Details

• Gas type: Breathing air according to DIN EN 12021 (Nitrox up to 40% O also possible)
• Working pressure: 232 / 300 / 330 bar
• Max. operating pressure: up to 420 bar
• Intake pressure: atmospheric / max. 300 mbar
• Permissible ambient temperature: 10 °C to +40 °C
• Max. installation altitude: 1,500 m
• Maximum inclination: 15°
• Frame: Steel frame, powder-coated (RAL 9005)
• Delivery rate: 450 l/min (27 m³/h)
• Cooling airflow: approx. 4,050 m³/h
• Noise level: approx. 6870 dB(A)
• Weight: approx. 446 kg
• Dimensions (W × D × H): approx. 93 × 124.5 × 168.5 cm
• Motor type: Three-phase motor
• Motor power: 7.5 kW (10 HP)
• Operating voltage: 400 V / 50 Hz or 440 V / 60 Hz
• Rated current: approx. 15 A
• Speed: approx. 2,870 RPM
• Protection class: IP55
• 4 compression stages
• Forced lubrication with gear pump
• Stainless steel piping (AISI 316)
• Interstage condensate separators
• Safety valves after each compression stage

Filter System & Air Quality

• Dual Hyperfilter system (2 filters)
• Filter operating pressure: 250 / 330 / 360 bar
• Air purification capacity: approx. 3,050 m³ (at 20 °C / 300 bar)
• Breathing air quality according to DIN EN 12021

Standard Equipment

• Sound-insulated enclosure
• 4 high-pressure filling connections (DIN 232 / DIN 300 / INT-Yoke selectable)
• Electronic pressure switch
• Interstage pressure gauges
• Automatic condensate drain
• High-pressure final separator
• Pressure maintaining / non-return valve

Optional Equipment

• Presec filter monitoring system
• Tornado high-pressure refrigeration dryer
• Multi-gas analysis system (SAM)
• CO SafeGuard
• Remote filling panel