Thanks for all the responses. I guess the answer is, "No. There is no easy / safe way to make the leaks visible."
I have flowmeters on the line and am logging usage via the machine PLC and know what the cost is. Some theatre can help get the point across and this is why I asked.
Some machines in our manufacturing facility have very bad air leaks. We can hear them and find them using ultrasonic listening, leak finder spray (soapy water), etc. but I would like some way of showing the scale of the problem using a 'smoke' or fog. The problem is that any smoke will leave a...
