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BOREAL LASER GasFinderAB
Leak detection in Natural Gas Pipelines
BOREAL LASER GasFinderAB
  • Methane specific
  • No interferences & no false alarms
  • High resolution – down to 0.2 ppm CH4
  • Wide measurement range
  • Fast response time – as low as 0.33 seconds
  • Survey vehicle can fly/drive at normal speed
  • Self-calibrating—no calibration needed
  • Direct measurement – no sample line
  • Robust, solid state instrument
  • No need for instrument operator
  • Easy installation and removal
  • Optional GPS

Overview
Natural gas pipeline owners require improved routine monitoring of pipelines for safety, economic and regulatory reasons. Leaking natural gas can cause explosions leading to loss of life and property. Loss of product through undetected leaks dramatically reduces a pipeline operator's profitability. Traditional ground-based leak detection with hand-held or vehicle mounted FID detectors is slow and labour - and maintenance - intensive. IR detectors have been used for both airborne and vehicle mounted surveys, but with limited success because of cross interference from other atmospheric gases.

How the Methane leak GasFinder works
How the Methane leak GasFinder works The heart of the system is a GasFinderFC CH4 gas analyzer (see schematic below). The GasFinderFC houses a laser diode, drive electronics, and micro-computer subsystems. A fibre-optic cable carries the laser light to an external measurement probe. The laser light makes multiple passes through this probe and is focused on a photo-detector. The resulting photo current is returned to the GasFinderFC control unit via coaxial cable for analysis. The airborne probe employs a robust mechanical design with simple, stable optical components. A foam shroud minimises dust and debris entering the path, but allows free passage of ambient air into the measurement zone. The vehicle probe employs the same basic design but is simpler and shorter. Both probes have a sensitivity of 0.2 ppm and a range of 0 to 200 ppm. The airborne probe takes 3 readings per second. The vehicle probe takes readings once per second. A portion of the laser beam is passed through a stable built-in reference cell inside the GasFinderFC to provide a continuous calibration update. Real time readings are provided on a local display unit and transferred via serial interface to a data logging PC. The serial signal includes comprehensive system diagnostics. A GPS system provides spatial coordinates to the data-logging PC, which enables CH4 data to be mapped along the survey route.
BOREAL LASER GasFinderAB
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