How do you use qw466.1...test jig dimensions ex sa106b with roller jig

New to this, how do you determine the diameter of press to use with the roller jig with sa 106 grade b pipe and 3/8 thick specimen?

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the specs are in the applicable code books.

i think AWS B2.1 lists the dimensions. and also B4.0
if you can borrow a copy from someone, you can probably find what you need.

i dont have these at my disposal

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