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Confused by NFPA 2 and NFPA 55 separation distances - what to do when pipe size is >2"?

Confused by NFPA 2 and NFPA 55 separation distances - what to do when pipe size is >2"?

Confused by NFPA 2 and NFPA 55 separation distances - what to do when pipe size is >2"?

(OP)
Looking at general guidance for separation distances for hydrogen systems and skimming through the NFPA hydrogen guidance. For Gaseous hydrogen storage, NFPA 2 and 55 have the same tables which relate pressure, pipe diameter and hazard category to minimum separation distance. The tables that are present only go up to 2" however. How do you apply this guidance to systems with pipe sizes >2"? What about separation distances for equipment more generally? Am I looking in the wrong NFPA standards?

I know there is other guidance available, but in this instance I'm specifically asking about NFPA.

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