Product Overview

The Bently Nevada 24765-01-01 is a specialized Case Expansion Transducer Assembly utilizing Linear Variable Differential Transformer (LVDT) technology. This precision instrument is a vital component of Turbine Supervisory Instrumentation (TSI), specifically engineered to monitor the thermal growth of large machinery casings. As steam or gas turbines reach operating temperatures, the housing expands; this assembly tracks that displacement relative to the machine's foundation. By providing real-time data on casing movement, it ensures that expansion occurs freely along the sliding feet, preventing structural binding, misalignment, or internal mechanical rubs that could lead to catastrophic failure.

Key Technical Characteristics

The 24765-01-01 is designed for high-stability performance in the extreme thermal environments surrounding power generation and industrial compression equipment.

• Model Identification 24765-01-01

• Transducer Type DC-Operated Linear Variable Differential Transformer (LVDT)

• Measurement Range 1.0 inch (25.4 mm) total linear stroke

• Environmental Protection IP67-rated housing for resistance against moisture and dust ingress

• Operating Temperature -18°C to +71°C (Standard industrial range)

• Housing Material Robust, corrosion-resistant construction for long-term field durability

• Linearity ±0.5% of full-scale range

• Output Signal DC voltage proportional to displacement (Interfaces with 3500/45 Position Monitors)

• Installation Design Integrated LVDT housing (HSG) that facilitates secure mounting to the turbine deck or sliding foot assembly

Operational Use Cases and Industrial Applications

The 24765-01-01 is an essential safety and diagnostic tool for large-scale rotating machinery where thermal management is critical to operational integrity.

• Steam Turbine Thermal Growth Continuous monitoring of the axial expansion of the turbine shell during startup and shutdown cycles to verify sliding foot freedom.

• Gas Turbine Casing Monitoring Tracking structural changes and shell expansion to maintain internal clearances between rotating and stationary components.

• Power Generation Facilities Integrated into plant-wide protection systems to provide automated alarms if expansion becomes asymmetrical or restricted.

• Industrial Process Compressors Measuring casing displacement in high-pressure gas applications to detect piping strain or foundation shifts.

• Predictive Maintenance Providing trend data to identify "stick-slip" conditions in turbine supports before they cause vibration issues or structural damage.