Hydrogen is finding some footing for wider use as a fuel these days, and I have seen a significant increase in inquiries from existing and new clients about process safety for H2 storage and use. I always follow Chapter 700 of the International Gas Code as my baseline code requirements and then move into NFPA 2 for a more detailed analysis of the process. In this article, we will cover the pressure and leak testing of H2 piping, as many contractors are not following this or ASME B31.12 for this safety-critical step in the design and construction of H2 piping.