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Pipeline and Hazardous Materials Safety Administration

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49 CFR Parts 100 - 199

This section provides interpretations related to PHMSA’s safety regulations, as well as regulations parts identified by the part number and subject. To view interpretations related to the part number, select the hyperlink on the right. These interpretations are specific to the scenarios in which they are responding to and may not be applicable to different fact scenarios. To browse regulation sections by part, click on the subject link below to access the eCFR website to view part sections.

You can also browse PHMSA interpretations using the browser to the left. Click the glass icon to search by keyword, Orders of the Chief Counsel, regulation part/section or reference ID. You can also use the filter icon to view a list of interpretations related specifically to pipeline safety or hazardous materials safety. The "<" and ">" icons will collapse and expand the interpretations browser.

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Part Subject View Interpretations
105 HAZARDOUS MATERIALS PROGRAM DEFINITIONS AND GENERAL PROCEDURES View Part 105
106 RULEMAKING PROCEDURES View Part 106
107 HAZARDOUS MATERIALS PROGRAM PROCEDURES View Part 107
109 DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIAL PROCEDURAL REGULATIONS View Part 109
110 HAZARDOUS MATERIALS PUBLIC SECTOR TRAINING AND PLANNING GRANTS View Part 110
130 OIL SPILL PREVENTION AND RESPONSE PLANS View Part 130
171 GENERAL INFORMATION, REGULATIONS, AND DEFINITIONS View Part 171
172 HAZARDOUS MATERIALS TABLE, SPECIAL PROVISIONS, HAZARDOUS MATERIALS COMMUNICATIONS, EMERGENCY RESPONSE INFORMATION, TRAINING REQUIREMENTS, AND SECURITY PLANS View Part 172
173 SHIPPERS-GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS View Part 173
174 CARRIAGE BY RAIL View Part 174
175 CARRIAGE BY AIRCRAFT View Part 175
176 CARRIAGE BY VESSEL View Part 176
177 CARRIAGE BY PUBLIC HIGHWAY View Part 177
178 SPECIFICATIONS FOR PACKAGINGS View Part 178
179 SPECIFICATIONS FOR TANK CARS View Part 179
180 CONTINUING QUALIFICATION AND MAINTENANCE OF PACKAGINGS View Part 180
190 PIPELINE SAFETY ENFORCEMENT AND REGULATORY PROCEDURES View Part 190
191 TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE; ANNUAL REPORTS, INCIDENT REPORTS, AND SAFETY-RELATED CONDITION REPORTS View Part 191
192 TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS View Part 192
193 LIQUEFIED NATURAL GAS FACILITIES: FEDERAL SAFETY STANDARDS View Part 193
194 RESPONSE PLANS FOR ONSHORE OIL PIPELINES View Part 194
195 TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE View Part 195
196 PROTECTION OF UNDERGROUND PIPELINES FROM EXCAVATION ACTIVITY View Part 196
198 REGULATIONS FOR GRANTS TO AID STATE PIPELINE SAFETY PROGRAMS View Part 198
199 DRUG AND ALCOHOL TESTING View Part 199