>In the past, I have cut a hole in the back of >furnace, to confirm that the cracks, go through >the metal. Recently the company that I work for, >made it policy that we have to pull heat >exchangers to confirm cracks. Does anyone have >another way to confirm cracks? We also cant use >smoke sticks, or are investing into the camera's. We use many of the methods mentioned in the other post.
But my camera seems to on the job more and more. There are many cameras out there to choose from. We use one called Snake Eye. I think I paid about 1600.00 for it. Worth every penny David.
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Ellis Prach system See ME's post below. Ellis of heat exchanger experts has the best system in my opinion to find cracks, he is as passionate about this topic as anyone on this site is about wet heat. His system uses detailed visual inspection with thin mirrors, a book of furnace brands showing where most cracks or defects are found and a water or WD 40 spray technique to confirm the crack.
Ellis makes the case that most brands of a certain age crack in the same place ( like the Lennox dura curve) and if you know where to look and spray water with surfecant( a wetting agent for plant leaves) or enough water the crack will show up. He offers courses all over the country for about $300 where he demonstrates this, well worth the time. Sadly most attendees are home inspectors. His book of cracks by brand is only about $75 with yearly updates and he is great about helping tech schools. For those that want one single never fail method for inspecting heat exchangers. There is none. Directive 90 496 Cee Pdf Converter more. Think about it.
Would you inspect a Pulse heat exchanger the same way as a clamshell heat exchanger, a clamshell heat exchanger the same way as a tubular heat exchanger? No you wouldn't nor should you. With equipment, knowledge and training you can become more proficient at inspecting heat exchangers.
Types of Heat Exchanger Failures 1. Rust perforations. Leaking heat exchanger seams. Loose or missing screws securing cells. Broken crimped rings 6.
Broken or leaking seals or gaskets, including cemented seals. Missing factory welds on seams. Inspecting Heat Exchangers 1. Flame deviation test. Watch the burner flame.
Flame movement when the circulator blower comes on indicates leakage. If you do not locate a crack or perforation the heat exchanger the seams can be leaking or the metal may have pinholes rusted through. Visual inspection of burner chamber area and exterior of heat exchanger using a flashlight with high candlepower such a rechargeable Mag Lite. Use a variety of mirrors. Small round and oval mirrors that have long telescoping reach are available at most welding supply stores.