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dear all who have contributed to this thread, may there is some missunderstanding in the problem statement. actually we look for the leaks inside the pipe line, not into outside area. if anyone has ideas, i will appreciate this. thanks anyway.

dear caihui, thank you very much for the advise. we discussed this idea but due to a certain limitations in standards for natural gas we can't add anything like inert gases. we thought about inserting some waves in one part of the spectrum (gamma rays, or something). but in this case we'll get...

Dear terje61, thank you very much. i've heard about the sonic inspection but didn't know where to find equipment. your link is very useful. don't you know anything about normative documents regarding this theme? again thank you very much. i appreciate this. regards, mkarpash

do anyone knows anything about non-destructive examination of burried steel ball valves? in ukraine we have got a lot's of problem with them. before we dig it out and replace (which is not really cheap) we would like to know whether it leaks and if yes how much.