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GMB High Capacity Roots Vacuum Booster Pumps

Innovative modular rotor design of high strength alloy-steel shafts with lightweight rotor lobes which safely enable higher running speeds. 

GMB25K mechanical booster pump

Flexible with multiple systemisation options available

The GMB is scalable with multiple backing configurations available. Built to global standards IEC and NEMA flange compatibility. ATEX options are also available for use Hazardous or chemical applications.  

High capacity pump with a low footprint

Innovative modular rotor technology ensures high performance on the smallest footprint and weight. This ensures the highest degree of flexibility when designing large vacuum systems.

Designed for harsh applications

The GMB is a robust pump designed for harsh applications. The innovative modular rotor design is of high strength alloy-steel shafts with lightweight rotor lobes. This patented construction gives maximum displacement on an industry leading footprint. 

  • Steel degassing
  • Vacuum Metallurgy
  • Low density wind tunnels
  • Space simulation
  • Chemical Process Industries
  Units GMB25K GMB40K
Displacement (swept volume) at 3,960 rpm m3 /hr (cfm) 25500 (15009) 44300 (26074)
Minimum backing capacity m3 /hr (cfm) 4500 (2649) 6500 (3825)
Maximum pressure across booster mbar (torr) 30 (22.56) 25 (18.75)
Total input power at ultimate kW (hp) 3.6 (4.8)
Ultimate pressure mbar (torr) <0.01* (<0.008)
Rotational speed rpm (min) 540
rpm (max) 3960
Motor power kW (hp) IEC ‒ 30 (NEMA ‒ 40)
Vibration mm s-1 (inch s-1) <4 (<0.16)
Cooling water connections   R1/2" female
Cooling water temperature °C (°F) 5 ‒ 40 (41 ‒ 104)
Minimum cooling water flow (@max. temp.) litres min-1 (US gal min-1) 10 (2.6)
Minimum cooling water pressure drop bar (psi) 1 (14.7)
Seal purge connection, suitable for   1/4” outside diameter rigid tube
Purge gas pressure bar (psi) 0.3  ‒ 0.5 (5 ‒ 7)
Purge gas flow (minimum) slm 4
Recommended lubrication type Synthetic booster gear oil Ultragrade 150
Lubricant quantity litres (US gal) 7 (1.85)
Connection flanges Inlet DN350 PN6 DN500 PN6
Outlet ISO250
Weight (without motor) kg (lbs) 1400 (3086) 2088 (4603)
Ambient T °C (°F) -20 ‒ 40 (-4  ‒ 104)
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SERVICE SOLUTIONS

Read more on our offerings in Service Solutions