Pipe Schedule

Google brings

Results 1 - 10 of about 288 for ANSI/ASME B 36.10 Pipe 3.5" Sch XXS. (0.18 seconds)

the first link

does not show XXS in 3.5" (though it exists in 3" and 4")

and the value 16.2 is average of 3"(0.60") and 4" (0.674")

But this type of averaging is not valid.

Though the 36.10 is not at the moment accessible, none of my soft catalogues show XXs at 3.5" (all are "-" for this size)

ANSI B36.10 (1970)

3-1/2-inch (nom) XXS: wall thickness 0.651 inches.