Industrial and aeroderivative gas turbines combine high shaft speeds with small internal clearances, leaving little margin between normal operation and damage. A Bently Nevada 3500 protection system — fed by 3300 XL proximity probes — guards radial vibration, axial position, and speed on the turbine, its gearbox, and the driven machine. TenBN stocks the sensors and modules behind those systems, including direct replacements for legacy 7200 installations.
Machinery covered in this application
Typical machinery in this application:
- Industrial gas turbines — frame machines for power generation and mechanical drive
- Aeroderivative units — lightweight, high-speed rotors in peaking service
- Mechanical-drive turbines — pipeline and process compressor drives
- Load gearboxes — where overspeed and misalignment meet
What is monitored — parameters and typical faults
- Radial vibration — unbalance, misalignment, shaft rub, and journal bearing wear show up first in shaft vibration.
- Axial position & thrust — thrust bearing wear and rotor axial shift are caught before metal-to-metal contact.
- Speed & phase reference — one keyphasor pulse per revolution anchors overspeed protection and phase analysis.
- Frame & bearing-cap vibration — looseness, soft foot, and structural resonance on smaller or slower machines.
Recommended Bently Nevada building blocks
- 3300 XL 8 mm Proximity Probe System — industry-standard shaft vibration and gap measurement for sleeve-bearing machines.
- 3300 XL Extension Cables & Proximitor Sensors — matched signal-path components that keep measurements stable over long cable runs.
- 3500 Monitoring System — rack-based protection with configurable alarm and trip setpoints for critical trains (42M vibration monitors, 45 for expansion).
- 3500/25 Keyphasor Module — speed and phase reference for protection and diagnostics.
- 7200 Series Sensors — direct replacements for legacy 7200 proximity and seismic installations.
Spares and support from TenBN
TenBN keeps Bently Nevada sensors, cables, Proximitors, and 3500/3300-series modules in stock for fast worldwide dispatch. Send us your part number — or a photo of the nameplate — and our team will confirm compatibility, price, and lead time within one business day.