Iso 5251 5D Pipe error?

[Anonymous]

Hi,

I've recently used the ISO 5251 pipe fitting, I had not noticed it was marked as a 5D radius, only when the pipe supplier pointed it out.

However when I checked it, the pipe was modelled at 2D to 2.5D even though its marked in content centre at 5D!

Has anybody else found this, am I missing something, do ISO use some other convention?

2D to me means 2x diameter for the radius to the centreline of the bend. See attached the "5D" bend that isn't.  

All the best,

John.