John,
Use Cunifer. It is a lot easier to work on, you can bend it by hand if
you are carefull, no tools needed (but recommended though), corrosion
resistant, easy to get and relatively cheap.
Making the proper double flanges on SS pipes is difficult. Single
flanges are no problem but I think they are not legal and prone to
cracking. You also need bending equipment. The required aviation quality
might be hard/expensive to get as well.
Kees Oudesluijs
NL
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coudesluijs.vcf]
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