How can I perform visual inspection of welds or corrosion condition from the inside of tubes or small containers with no direct line-of-sight access?
You should procure long and thin optical instruments called Borescopes. There are many types, portable, rigid or flexible if made with optical fibers, and they contain an autonomous light source to illuminate the area to be inspected. Sophisticate equipment may include a camera and transmit the view to a portable TV screen. There use is invaluable but the inspector needs to get training and some experience before being able to perform reliable inspections. Interested readers can browse manufacturers’ catalogs to find the instrument best adapted to their requirements. Top Safety in Hydrogen Furnaces [from PWL#083 – Section 3] The Hydrogen protective atmosphere has many useful applications in furnaces for metal processing, because of the reducing properties of this light gas. It is therefore widely used for bright annealing processes and for brazing stainless steels and nickel alloys. However it has a number of safety issues because Hydrogen gas at 1 atm is flammable in the concentration
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