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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

49 CFR Parts 100-199

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents here: https://www.phmsa.dot.gov/about-phmsa/phmsa-faqs.

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: pipeline_interp_submittal@dot.gov. In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The eCFR is also searchable by keyword and other available options on the eCFR website. To search and browse regulations using the eCFR website, use the link below. For assistance, please send an email to PHMSA.Webmaster@dot.gov.

Search the eCFR

E.g., 02/09/2021
E.g., 02/09/2021
Part/Section Subject
173.212 Non-bulk packagings for solid hazardous materials in Packing Group II
173.213 Non-bulk packagings for solid hazardous materials in Packing Group III
173.216 Asbestos, blue, brown or white
173.217 Carbon dioxide, solid (dry ice)
173.219 Life-saving appliances
173.22 Shipper's responsibility
173.220 Internal combustion engines, vehicles, machinery containing internal combustion engines, battery-powered equipment or machinery, fuel cell-powered equipment or machinery
173.222 Dangerous goods in equipment, machinery or apparatus
173.223 Packagings for certain flammable solids
173.224 Packaging and control and emergency temperatures for self-reactive materials
173.225 Packaging requirements and other provisions for organic peroxides
173.226 Materials poisonous by inhalation, Division 6.1, Packing Group I, Hazard Zone A
173.227 Materials poisonous by inhalation, Division 6.1, Packing Group I, Hazard Zone B
173.22a Use of packagings authorized under special permits
173.23 Previously authorized packaging
173.24 General requirements for packagings and packages
173.240 Bulk packaging for certain low hazard solid materials
173.241 Bulk packagings for certain low hazard liquid and solid materials
173.242 Bulk packagings for certain medium hazard liquids and solids, including solids with dual hazards
173.243 Bulk packaging for certain high hazard liquids and dual hazard materials which pose a moderate hazard
173.244 Bulk packaging for certain pyrophoric liquids (Division 4.2), dangerous when wet (Division 4.3) materials, and poisonous liquids with inhalation hazards (Division 6.1).
173.247 Bulk packaging for certain elevated temperature materials
173.24a Additional general requirements for non-bulk packagings and packages
173.24b Additional general requirements for bulk packagings
173.25 Authorized packagings and overpacks
173.26 Quantity limitations
173.27 General requirements for transportation by aircraft
173.28 Reuse, reconditioning and remanufacture of packagings
173.29 Empty packagings
173.2a Classification of a material having more than one hazard
173.3 Packaging and exceptions
173.30 Loading and unloading of transport vehicles
173.301 General requirements for shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles and spherical pressure vessels
173.301a Additional general requirements for shipment of specification cylinders
173.301b Additional general requirements for shipment of UN pressure receptacles
173.302 Filling of cylinders with nonliquefied (permanent) compressed gases or adsorbed gases
173.302a Additional requirements for shipment of nonliquefied (permanent) compressed gases in specification cylinders
173.302b Additional requirements for shipment of non-liquefied (permanent) compressed gases in UN pressure receptacles
173.303 Charging of cylinders with compressed gas in solution (acetylene).
173.304 Filling of cylinders with liquefied compressed gases
173.304a Additional requirements for shipment of liquefied compressed gases in specification cylinders
173.304b Additional requirements for shipment of liquefied compressed gases in UN pressure receptacles
173.306 Limited quantities of compressed gases
173.307 Exceptions for compressed gases
173.308 Lighters
173.309 Fire extinguishers
173.31 Use of tank cars
173.310 Exceptions for radiation detectors
173.312 Requirements for shipment of MEGCs
173.314 Compressed gases in tank cars and multi-unit tank cars