Opportunity
Federal Register #2026-18346
PHMSA Petition: Approval of EFFECTS Version 12.2.0 for LNG Vapor-Gas Dispersion Modeling
Buyer
Pipeline and Hazardous Materials Safety Administration, Department of Transportation
Posted
September 09, 2026
Respond By
October 09, 2026
Identifier
2026-18346
PHMSA is seeking public input on a petition to approve EFFECTS Version 12.2.0 software for LNG vapor-gas dispersion modeling. - Government Buyer: - Department of Transportation (DOT) - Pipeline and Hazardous Materials Safety Administration (PHMSA) - OEM/Vendor: - Gexcon U.S., Inc. (manufacturer of EFFECTS software) - Product Requested: - EFFECTS Version 12.2.0 modeling software - No specific part number or quantity provided - Current Regulatory Context: - PHMSA requires DEGADIS 2.1 or FEM3A models for LNG facility exclusion zone calculations - Alternative models may be approved if validated by experimental test data - Unique Requirements: - Model must be validated against physical factors and experimental test data - Compliance with federal safety standards (49 CFR 193.2059) - Approval is for use of the model, not direct procurement - Petition and draft decision letter available for review and comment
Description
PHMSA is soliciting public comments on a petition by Gexcon U.S., Inc. seeking approval to use EFFECTS Version 12.2.0 as an alternative model for calculating flammable vapor-gas dispersion exclusion zones at liquefied natural gas (LNG) facilities. The petition aims to authorize this model for use in siting LNG facilities under federal safety standards. Comments on the petition are due by October 9, 2026. The notice includes a draft letter of decision and invites stakeholders to review and comment on the proposed alternative model.