Brothers and Sisters, there ain't no such thing as an "industry standard" that covers this issue. That is why we constantly have this discussion.
"The minimum a fitter can cut off" Why not train the welder to bevel the end of a piece of pipe and weld it to the fitting (or whatever) then make the cut for the other end of the "Pup"?
Meh,
Piping designers throught the world use 50mm.
Its (normally) used to space a flange coming of an elbow or tee. Specifically, for slip on flanges, anything less than 50mm gets a bit difficult to handle.
Industry std, unwritten rule, rule of thumb, call it what you like, but its there.
Tj.
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