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NFPA 55 - H2 vent stacks

Question asked by Rob Firnstein on May 15, 2018

Are hydrogen vent stacks recognized as 'uninsulated' portions of a bulk hydrogen system for the purpose of considering hazard separation distances?

If so, does the separation distance apply to the vent stack exit or the vent stack piping itself?

For example if you use NFPA 55 Table 11.3.2.2 and determine that a particular system should be 50' from a building wall opening, does that mean 50' horizontal distance from the vertical stack pipe or 50' point to point distance from stack exit to the wall opening?

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