# Pipeline and Hazardous Materials Safety Administration 4 documents across 3 days of the archive, 0 of them final rules. The five most recent days are below. [HTML](https://downstream.sh/daily/agency/pipeline-and-hazardous-materials-safety-administration/) · [the long-form archive](https://downstream.sh/daily/agency/pipeline-and-hazardous-materials-safety-administration/archive.md) · [the daily issue](https://downstream.sh/daily/index.md) ## Dates this agency has set that have not yet arrived | Date | Offset | What | Document | Agency | |---|---|---|---|---| | 2026-10-09 | +28d | Comments close | [Gexcon U.S., Inc.'s Petition for EFFECTS Version 12.2.0 as an Alternative Model for Calculating the Vapor-Gas Dispersion Exclusion Zone](https://www.federalregister.gov/documents/2026/09/09/2026-18346/gexcon-us-incs-petition-for-effects-version-1220-as-an-alternative-model-for-calculating-the) | Transportation Department · Pipeline and Hazardous Materials Safety Administration | ## 10 September 2026 — 1 document [the whole issue for this day](https://downstream.sh/daily/2026-09-10.md) > The Pipeline and Hazardous Materials Safety Administration published a notice that the Federal Hazardous Materials Transportation Act preempts California's reusability mandate for propane cylinders. — via Downstream, https://downstream.sh/daily/agency/pipeline-and-hazardous-materials-safety-administration/#s-2026-09-10 *Machine-written by `claude-haiku-4-5-20251001` from the documents below.* ### Hazardous Materials: California's Reusability Mandate for Propane Cylinders *Notice* — Transportation Department · Pipeline and Hazardous Materials Safety Administration The Federal Hazardous Materials Transportation Act (HMTA), 49 U.S.C. 5101 et seq., preempts California's reusability mandate for propane cylinders in California Public Resources Code, Sections 42395- 42395.2. The reusability mandate imposes localized design and manufacturing requirements on a container that is represented, marked, certified, or sold as qualified for use in the transportation of a hazardous material--specifically, propane--that are not substantively the same as the requirements in the HMR. The reusability mandate is also an obstacle to accomplishing and carrying out the HMTA. By banning a federally authorized, safety-compliant packaging based on localized waste management preferences, California creates a fragmented regulatory patchwork that undermines the primacy and uniformity of the Federal transportation safety framework. 91 FR 57684 · FR Doc. 2026-18501 · [official PDF](https://www.govinfo.gov/content/pkg/FR-2026-09-10/pdf/2026-18501.pdf) · [federalregister.gov](https://www.federalregister.gov/documents/2026/09/10/2026-18501/hazardous-materials-californias-reusability-mandate-for-propane-cylinders) ## 9 September 2026 — 2 documents [the whole issue for this day](https://downstream.sh/daily/2026-09-09.md) ### Hazardous Materials: Notice of Administrative Determination of Preemption for Common Law Tort Claims Concerning the Transportation of Gasoline *Notice* — Transportation Department · Pipeline and Hazardous Materials Safety Administration The Exxon Mobil Corporation (Exxon) seeks a determination that Federal law preempts State common law claims brought against it in New Jersey concerning the safe transportation of gasoline in commerce. PHMSA is issuing a final administrative determination concluding that the State common law tort claims presented by Exxon are preempted. Each of these duties, if imposed, would present an obstacle to compliance with the Federal regulatory framework essential for the safe transportation of gasoline. In addition, any claims about covered subjects, such as the marking, loading and unloading, and classification of gasoline that are not substantively the same as the applicable HMR provisions are preempted. 91 FR 57439 · FR Doc. 2026-18382 · [official PDF](https://www.govinfo.gov/content/pkg/FR-2026-09-09/pdf/2026-18382.pdf) · [federalregister.gov](https://www.federalregister.gov/documents/2026/09/09/2026-18382/hazardous-materials-notice-of-administrative-determination-of-preemption-for-common-law-tort-claims) ### Gexcon U.S., Inc.'s Petition for EFFECTS Version 12.2.0 as an Alternative Model for Calculating the Vapor-Gas Dispersion Exclusion Zone *Notice* — Transportation Department · Pipeline and Hazardous Materials Safety Administration 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. - **Comments close** 9 October 2026 (in 28 days) 91 FR 57446 · FR Doc. 2026-18346 · [official PDF](https://www.govinfo.gov/content/pkg/FR-2026-09-09/pdf/2026-18346.pdf) · [federalregister.gov](https://www.federalregister.gov/documents/2026/09/09/2026-18346/gexcon-us-incs-petition-for-effects-version-1220-as-an-alternative-model-for-calculating-the) ## 1 September 2026 — 1 document [the whole issue for this day](https://downstream.sh/daily/2026-09-01.md) > The Pipeline and Hazardous Materials Safety Administration reopened the public comment period until September 4, 2026, for joint advisory committee proceedings on thirteen pipeline safety proposed rules. — via Downstream, https://downstream.sh/daily/agency/pipeline-and-hazardous-materials-safety-administration/#s-2026-09-01 *Machine-written by `claude-haiku-4-5-20251001` from the documents below.* ### Pipeline Safety: Joint Meeting of the Gas and Liquid Pipeline Advisory Committees *Notice* — Transportation Department · Pipeline and Hazardous Materials Safety Administration On July 17, 2026, PHMSA published a Federal Register notice titled: "Pipeline Safety: Joint Meeting of the Gas and Liquid Pipeline Advisory Committees," which provided an opportunity for public comment by August 31, 2026, on the proceedings of the Gas and Liquid Pipeline Advisory Committees meeting related to 13 notices of proposed rulemakings (NPRM). These proposed rules covered topics such as special permit conditions, in-plant piping, incidental gathering lines, coating damage assessments, atmospheric corrosion, class change pressure tests, maximum allowable operating pressure reconfirmation, operator identification notifications, limitations on welding, remote valves, the property damage definition, right-of-way patrols, and reporting deadlines. PHMSA received requests from stakeholders to extend the comment period. Based on those requests, PHMSA is reopening the comment period for the joint Pipeline Advisory Committee (PAC) proceedings related to the 13 regulatory modernizing NPRMs to September 4, 2026. - **Comments close** 4 September 2026 (7 days ago) 91 FR 56282 · FR Doc. 2026-17890 · [official PDF](https://www.govinfo.gov/content/pkg/FR-2026-09-01/pdf/2026-17890.pdf) · [federalregister.gov](https://www.federalregister.gov/documents/2026/09/01/2026-17890/pipeline-safety-joint-meeting-of-the-gas-and-liquid-pipeline-advisory-committees) ## Ask an assistant instead Everything on this page is also a tool call. Add `mcp.downstream.sh` as an MCP server — no key, no account — then paste this: ``` Using the Downstream MCP server at mcp.downstream.sh, call whats_new_since with agency "Pipeline and Hazardous Materials Safety Administration" since 2026-09-01, then summarise what changed and list every deadline it created. ``` Reaches `whats_new_since`. The response carries its own citations and states what it is missing, including which dates it has no record for. --- Every document linked here is a work of the United States government and in the public domain. The Federal Register's HTML and XML renderings are unofficial; the PDF on each item is the official text, and that is the one to cite. Counts are arithmetic over published fields, dates are printed as filed, and titles are verbatim. Where we have nothing, this says nothing rather than estimating. The one-sentence agency summaries are machine-written from those same fields and are labelled where they appear. [Downstream](https://downstream.sh/) · [the essay](https://downstream.sh/essays/a-country-that-can-see.html) · [the daily issue](https://downstream.sh/daily/) · [MCP endpoint](https://mcp.downstream.sh)