Bently Nevada 330851-02-000-056-90-00-05

1. Specification

Measurement range: 0-56mil.

Operating temperature range: probe end: -51 Celsius to +177 Celsius.

Probe cable and connector operating temperature range: -51 Celsius to +260 Celsius.

Operating temperature range: -35 Celsius to +85 Celsius.

Storage temperature range: -51 Celsius to +100 Celsius.

2. Feature

Mechanical protection: Bently Nevada 330851-02-000-056-90-00-05 may generate alarm signals as a consequence of receiving continuous monitoring of differential expansion, whereby its expansion value crosses the set safety range in the case of operability reminders for corresponding actions so that prevention of friction between the shaft and casing becomes possible. And, in general, mechanical protection for the steam turbine is provided.

Fault terminology assistance: In addition to providing accurate differential expansion values, Bently 330851-02-000-056-90-00-05 also assists engineers by providing accurate active equipment status fault diagnostics. It can timely discover potential faults of the equipment like rotor imbalance, misalignment or bearing wear issues by observing and analyzing the trend of differential expansion changes, through providing a strong basis for preventive maintenance and for trouble shooting.

High-precision measurement-technology: Bently Nevada 330851-02-000-056-90-00-05 combines advanced measurement principles and technologies, achieving high-precision differential expansion measurement. It can detect minute sign changes of expansion or contraction, providing the vast and accurate bases for the status monitoring-fault diagnosis of such equipment and for timely detection of potential problems to ensure every equipment operates safely and stably.

3. Application

Power Industry: The 600MW steam turbine exhibited abnormal fluctuations of differential expansion values during operation. The real-time monitoring of differential expansion of the steam turbine was achieved by interference with this Bently Nevada 330851-02-000-056-90-00-05. The engineers found that the load would see a marked oscillation in the differential expansion values which extended across the normal ranges of acceptable loading limits. Further investigation showed this occurred because actual movement of the steam turbine shifting linkages was impeded, thus inhibiting the action of the differential expansion from its normal condition. Processing was conducted on the shifting pin mechanism to minimize serious accidents involving destruction of the turbine shaft due to excessive differential expansion, ensuring that safe and reliable serviceability of the unit is retained.

Petroleum Industry: After a while, this enterprise had challenges with centrifugal compressors, which included increased vibration levels and noise. The technicians suspected that it was the abnormal differential expansion, between the rotor and the casing. Thus, they installed the Bently 330851-02-000-056-90-00-05 for monitoring. The monitoring data indicated that the differential expansion value of the compressor changed periodically during operation, and its range was widespread. Due to the great fluctuations of temperature for the imported processing gas, it was traced, analyzing the structure and working parameters of the compressor, that there was inconsistent expansion concerning rotor and shell. On the basis of the parameters furnished by the Bently 330851-02-000-056-90-00-05, adjustment and control of the process gas temperature were conducted, in restoration of differential expansion back to the normal range, solving the vibration and noise problems of the compressor and increasing the longevity of the equipment.

Steel Industry: Bently Nevada 330851-02-000-056-90-00-05 played an important role in a large steam turbine-driven blower at a steel plant. During an equipment check, it was found that the differential expansion value monitored by Bently Nevada 330851-02-000-056-90-00-05 had a tendency to increase. After a comprehensive inspection of the equipment, it was found that the steam inlet pipe of the steam turbine was partially blocked, causing uneven steam inlet, which changed the differential expansion between the shell and the rotor. That prompted cleaning and timely maintenance of the steam inlet pipe, to ensure normal operating condition of the steam turbine, in mind of avoiding possible equipment failure by virtue of problems of differential expansion, and in further ensuring smooth and steady production of steel.