Atmospheric Discharge Gas Cooled Roots Pump

The Atmospheric Discharge Gas Cooled Roots Pump is a heavy-duty positive displacement vacuum pump engineered for industrial vacuum systems that require high gas throughput and continuous operation under high pressure differentials.
Unlike standard vacuum boosters that risk overheating when discharging against high backpressures, this pump utilizes an integrated secondary gas-cooling system. By effectively dissipating the thermal energy generated during continuous compression, it maintains stable operating temperatures even when working near or directly against atmospheric pressure.

The table below outlines key standard performance parameters. Exact operating limits should be validated against the specific model performance curve and process gas characteristics.

Pumping Speed & Performance Curves
Nominal displacement alone does not dictate real-world performance. The effective pumping speed must be calculated based on chamber volume, required evacuation time, process gas load, leakage, and outgassing rates.
Thermal Load Management
High differential pressure creates substantial thermal stress. Without proper cooling, rising temperatures can lead to rotor thermal expansion, loss of mechanical clearance, seal damage, and lubricant breakdown.
Gas Composition & Process Compatibility
Process gases dictate the necessary metallurgy, seal materials, and cooling media. Complete gas details should be verified before final selection:

• Corrosive or Reactive Gases: Requires 316L stainless steel, Hastelloy, or protective internal coatings.
• Vapors and Condensables: Requires controlled cooling gas temperatures to prevent unwanted condensation inside the pump chamber.
• Particulates or Dust: Requires upstream inlet filtration systems, such as cyclone separators or dust filters.

Continuous Duty Cycle
Intermittent evacuation and continuous 24/7 process pumping impose different mechanical demands. For continuous-duty applications, thermal equilibrium and bearing load capacity must be verified at maximum continuous gas throughput.

Precision Machining: Housing bores and rotor profiles are machined on multi-axis CNC centers to maintain tight volumetric tolerances while preventing internal mechanical contact.
Dynamic Balancing: All rotor assemblies are dynamically balanced to ISO 1940 Grade G2.5 standards to reduce operational vibration and prolong bearing life.
Clearance Control: Rotor-to-rotor and rotor-to-housing clearances are inspected at room temperature and verified under maximum working thermal conditions.
Timing Gear Precision: Precision ground timing gears ensure accurate angular alignment between non-contacting rotors under full load.
Factory Acceptance Testing (FAT): Every pump undergoes factory testing prior to dispatch, including:

• Hydrostatic and helium leak rate testing
• Vibration and noise level verification (ISO 10816)
• Full-load temperature-rise run testing at peak differential pressure

Vacuum Drying and Freeze Drying: Efficiently handles high vapor volumes during rapid initial pump-down and extended drying phases.
Vacuum Metallurgy & Steel Degassing: Delivers sustained high-throughput capacity during VIM, VAR, and steel degassing processes.
Chemical & Petrochemical Processing: Suitable for solvent recovery and handling volatile organic compounds (VOCs) when configured with ATEX motors and chemical-grade seals.
Transformer Oil Purifying Systems: Easily integrated into mobile or stationary oil-treatment skids requiring continuous discharge against atmospheric pressure.
OEM Vacuum System Integration: Functions as a primary booster stage for high-capacity industrial skids and vacuum furnaces.

To receive an accurate sizing calculation and technical proposal, please provide the following process parameters:

• Required Pumping Speed: (m3/h or CFM)
• Working Pressure & Ultimate Target Pressure: (mbar or Pa)
• Maximum Inlet Pressure & Discharge Pressure: (mbar)
• Process Gas Composition: (Include any corrosive, toxic, or flammable components)
• Gas Inlet Temperature & Moisture Content: (°C / % RH)
• Chamber / System Volume: (m3)
• Required Evacuation Time: (Minutes)
• Duty Cycle: (Continuous 24/7 or Intermittent)
• Power Supply: (Voltage, Frequency, Explosion-proof requirements)
• Existing System Configuration: (Backing pump model, if applicable)

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