DetectionCoverage

The detection range of the Gassonic acoustic gas leak detectors depends on the level of ultrasonic background noise in the area. Experience has shown that the detection range can be divided into three main categories, very low-level, low-level and high-level background noise areas. The following general guidelines can be applied based on a gas leak rate of 0.1 kg/s. According to industry performance standards this is the maximum release of methane gas to be tolerated in an outdoor production area.

In high-noise areas (bordeaux area) the trigger level of the ultrasonic (acoustic) gas leak detector is typically set to 84dB. This corresponds to a detection radius of 5-8 metres from the detector. Examples of high-level areas are:

  • Turbo compressor areas
  • Complete open offshore weather deck
  • Next to very noisy machinery

In low-noise areas (dark grey area) the trigger level of the ultrasonic (acoustic) gas leak detector is typically set to 74dB. This corresponds to a detection radius of 8-12 metres from the detector. Examples of low-level areas are:

  • Areas with no machinery
  • Areas with low frequency machine made noise

In very low-noise areas (light grey area) the trigger level of the ultrasonic (acoustic) gas leak detector is typically set to 64dB. This corresponds to a detection radius of 13-20 metres from the detector. Examples of typical areas are:

  • Onshore wellhead areas in calm environment
  • Salt dome gas storage facilities in calm environment
Detection Coverage

The above illustration shows that the ultrasonic background must be taken into consideration when implementing and allocating ultrasonic (acoustic) gas leak detectors.

Directionalcharacteristics

Detection Coverage for Gassonic Gas Leak Detectors

For optimal positioning of the Gassonic ultrasonic (acoustic) gas leak detectors it is important to understand the directional characteristics of the detectors. The detectors will provide full detection coverage in a 45 degree angle underneath the detector. In other angles the detectors will also provide detection at decreased distances. The general directional characteristics are illustrated on the right. These characteristics are based on conditions with no solid physical obstacles (vessels, solid walls e.g.) blocking the way between the detector and the gas leak. Normal piping does not affect the coverage of ultrasonic detectors. For certain applications it may be relevant to tilt the detector 45 degrees.

Gassonic A/S can be consulted for optimal allocation of ultrasonic detectors.

 

        The Technology
        Senssonic Self-Test
        North Sea Case Story
        Detection Coverage
        Installation Practice
        Background Noise
        Gas Leak Definition
        FAQ Acoustic Gas Detectors