16- or 32-point Fast Fourier Transform spectrum analysis versions are available for early warning of steam leaks in boiler tubing.
The conventional method of detecting tube leaks such as monitoring boiler make up water, mass balancing or merely depending on the human ear to recognise a sound change, are not sufficiently sensitive for large boilers. By using these methods the leak is often big enough to have already caused serious consequential damage sometimes to an entire boiler face.
Research on acoustic tube leak detection for power station boilers started during the 1970s and has since become the most advanced method of tube leak detection worldwide. In 1984 we produced a computer based acoustic tube leak detection system for use on large boilers.
Features of the INSPECTA FFT™ Acoustic Steam Leak Detection System:
- The INSPECTA FFT™ System uses Fast Fourier Transforms for generation of audio spectrums and computer analysis to determine the plant condition. When a leak is detected by a change in the sound signature, alarms are activated and the fault is localised.
- Mimic diagrams on the VDU show the plant operator where the leak is likely to be and print-outs can be made of sound spectrums, alarm bar graphs and trends.
- Power stations worldwide are now using this equipment for the early detection of tube leaks to reduce down time and prevent consequential damage. Leaks less than 2mm in diameter can be detected on 600 MW boilers.
- INSPECTA FFT™ Systems consist of self-contained multiplexers, a Eurocard CPU with factory programmed memory, a local display, serial output, alarm outputs and sensors located around the boiler. The 19" rack housing suits equipment panels and control rooms, with visual displays and disk-on-a-chip firmware.
Options include automatic waveguide air-purge low maintenance systems; Intrinsically safe (IS) sensors for hazardous areas; and SCADA software for logging historical data, trending and networking.
INSPECTA FFT™ Systems are designed, made and tested to comply with CE and C-Tick EMC, EMI and Low Voltage directives by the ISO9001 accredited Instrotech factory.
Full data, specifications, demonstration software and reference sites from an installed base of over 120 systems are available on request.