ASME B 31.12 code is for

Pipe thickness calculation criteria is same for ASME B31.12 & ASME B31.3

Weld Join Strength Reduction factor, W of AME B31.3 is replaced by performance factor Mf in ASME B31.12

Calculated thickness for hydrogen piping for specified design temperature and pressure will be more then the process piping requirements

ASME B31.12 requires a full weld joint penetration for stub-on and stub-in branches

Materials listed in ASME B31.3 & ASME B31.12 are same

ASME B31.12 allows usage of threaded and tubing joints?

DSS (Duplex Stainless Steel) is unlisted material in ASME B31.12

ASME B31.12 guides to avoid the use of Nickel-based alloys

Nelson curve talks about the material section for Hydrogen Service

Nelson Curve is mentioned in

As per ASME B31.12 Radiography test is not required after post-weld heat treatment for low alloy steels

NDE requirements are more stringent in

Pre-Heat of upto 80 Degree is mandatory for all thicknesses as per

Pre-Heat temperatures requirements for carbon steel are different for ASME B31.3 & 31.12