Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Results of thermally visualised gas leaks, with related background conditions

Data from passive gas imaging surveys of methane gas leaks has been presented as analogue and digital data on videos and on hard disk, and has been distributed among the VOGUE partners. Selected passive gas imaging data has been delivered to the partners of Glasgow University for image processing in order to the reach the best compromise processing solutions, and to the partners of Advantica as input for the production of training materials.

The field test site of Malmoe has given unique possibility to perform passive gas imaging during controlled flow and temperature conditions. This together with simultaneous measurements of weather and radiation conditions at the leak source has made it possible to deduce and predict limits of passive gas imaging in terms of litre/min leaks at specified D T-conditions, range, wind speed, and signal-to-noise, valid for methane gas detection, pinpointing leak source, and visualising the gas cloud.

In addition to the production of videos, the results have also been presented in the deliverables two project deliverables. The information potential of passive gas imaging is outstanding when used as a tool to understand gas leak behaviour. The images from the field laboratory tests in Malmoe is easy to interpret and analyse and the results will probably become useful as an introduction to training programs, and to illustrate different types gas leak behaviour which may occur during real world conditions.

The results from remote gas surveys performed at the field test site of Malmoe confirm that passive gas imaging technologies are temperature dependent, but at a lower delta T-level than suspected. One of the IR-systems used gave signal-to-noise problems at a delta T of 20C, while another IR-system did not show signal-to-noise problems as low as 0.5C delta T conditions.

The results from the field tests also showed that it was easy to distinguish and follow the development and movements of a methane gas cloud from distances of 60-100m.

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