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should not subject the heat exchanger to abnormally high pressures, and should not detect insignificant leakage which may occur from pin holes in welded seams or other manufacturing imperfections. (Nov 10, 2014) Anonymous said: i have a silicone holding my heat exchanger tubes on some has come off is there a safe silicone for the air stream inside the furnace Reply: Anon Yes probably. Visual Inspection of the Furnace Heat Exchanger can Detect Some Leaks but Not All. When working on automobiles, please exercise due caution to ensure the safety of yourself and others. Also, freon is heavier than air. The two eyepieces offer different magnifications for low and high powered views.
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We also provide a, master index to this topic, or you can try the page top or bottom. Only if the flue gas side is more positive than the circulating air side will there be a tendency for flue gases to leak into the circulating air through any cracks or corrosion holes in the heat exchanger. This analysis of flue gas leakage based on the pressure difference across the heat exchanger is true for relatively small holes. Visually Inspect Heat Exchanger Air Heaters, asme PTC.3-2017, available from ansi, ansi Customer Service, Email: Tel:.212.642.4980 Website:. Carson, respectively DeWerth, Douglas, three step method FOR detecting unacceptable flue GAS leakage from furnace heat exchangers, Douglas DeWerth,.S., adapted from D Friedman, The ashi Technical Journal, Vol. Smells and odors in the building could be an indicator of heat exchanger leaks - see duct AIR handler odors. American Gas Association, 1515 Wilson Boulevard, Arlington, VA 22209 ansi Z21.47 / CSA.3 Gas Fired Central Furnaces 6th., (2016) - ansi Standard Z21.47-1983 allows 400 ppm air-free.