New Software for LNG Vapor Explosion Zones? Tech Petition Drops
Published Date: 9/9/2026
Notice
Summary
PHMSA is publishing this notice and a draft letter of decision to solicit public comment on a petition for approval that would authorize the use of an alternate flammable vapor-gas dispersion model in connection with the siting of liquefied natural gas (LNG) facilities.
Analyzed Economic Effects
1 provisions identified: 1 benefits, 0 costs, 0 mixed.
Petition to Approve EFFECTS v12.2
PHMSA is asking for public comment on a petition filed December 11, 2023 that would allow LNG facility operators to use the EFFECTS v12.2 software as an alternate model to calculate flammable vapor-gas dispersion exclusion zones required by 49 CFR part 193. Comments on the petition must be submitted by October 9, 2026. If approved, operators would be authorized to use EFFECTS v12.2 instead of the currently listed DEGADIS 2.1 or FEM3A models under 49 CFR 193.2059.
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