PWHT thickness for ASME B31.3 1

[kwaliteitshenk]

Does any one know if the max. thickness for P-No.1 material not requiring PWHT in Table 331.1.1 in the latest issue of ASME B31.3 is increased from 19 to 20 mm?

 

[JohnBreen]

B31.3 - 2006

P1 material
less than or equal to 20 mm = none
greater than 20 mm = 593 - 649 degrees C, 2.4 min / mm