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A335 P91 Type in Table A-2 of B31.1-2020

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Newbie2211

Newbie2211

Mechanical
Jul 5, 2022
12
I'd thought two types mean A335 P91 Type 1 and Type 2, but recently thought that maybe I misunderstand.
I mean, maybe Types in the table doesn't mean Type 1 and Type 2.

So, I bought ASTM A335-21 pdf file yesterday and tried to find out, but failed.
Does the types in the table mean ASTM A335 P91 Type 1 and Type 2?
Should I use Type 1 for pipes under 3 inch thickness and Type 2 for pipes above 3 inch thickness?
 
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I see no type 1 and 2 for A335 P91 in the table. There are two entries, one for >3" and one for <3" but not identified as Type 1 and 2.
 
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In the 2021 ed. of ASME Sec II Part D there are lines for SA335, P91 type 1 and 2. Looks like this is a revison from the 2019 ed of Sec II part D which was similar to what is listed in B31.3, 2020 ed.
 
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