GMB Roots Vacuum Booster Pumps - Brochure
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.
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.
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- Supported applications
- Technical specifications
- Downloads
- 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) | |
*With typical Edwards based backing pumps
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