InfraredA wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiationhas a wavelength from about 800nm to 1… Learn more… cameras are used to observe gas emitted from a flare stack. Where combustion efficiency is low the gas can be seen as a visible ‘black’ plume dispersing from the stack. The method utilises the same technology as used for leak detection and repair activities (LDAR) but is non quantitative.
How it works
Advantages
Can be conducted concurrently with leak detection and repair (LDAR) surveys
Limitations
Cannot measure methane directly or distinguish between gases
Non quantitative
Requires close access to the flare
Observations are dependent upon the skill of the operator
Case study
OGI detects the distinct thermal signature of methane gas as it is emitted in to the atmosphere. It is widely used for activities such as leak detection and repair, but can also be used to identify a flare that is poorly combusting or extinguished. The majority of observations are qualitative rather than a quantitative assessment of flow.