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Section §173.150: Exceptions for Class 3 (flammable and combustible liquids)

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

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: 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 regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 173.150 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0018 LDJ Manufacturing, Inc. Mr. David J. Ladwig View
23-0010 Advanced Printing Solutions Bill Booth View
21-0065 Smarter Sorting AJ Kenny View
21-0001 Oilmen’s Truck Tanks Robert Strong View
20-0082 Lawrence Bierlein View
20-0044 Railsback Safety Professionals LLC Rex Railsback View
19-0033 Railsback Hazmat Safety Professionals, LLC Rex Railsback View
18-0131 VA Pacific Islands Health Care System (119) Chaz Barit, Pharm.D. View
18-0139 SorbTech, Inc. Joanna Kilburn View
18-0110 Ascent Resources Utica, LLC Steven Parrish View
17-0110 Industrial Health & Safety Consultants, Inc. Denese A. Deeds, CIH, FAIHA, SDSRP View
17-0077 Texas Highway Patrol Brad Gibson View
18-0028 Vanilla Xtend Inc. Robert McDonald View
18-0043 Ventura County District Attorney's Office Mitchel Disney View
16-0075 Bureau of Dangerous Goods, LTD. Sandra Harding
170077 Texas Highway Patrol Mr. Brad Gibson View
09-0003 Environet LLC. Ms. Tammy L. Blakeslee View
14-0133 Virginia State Trooper Mr. Kevin Teter View
08-0094 Reeves Construction Company Mr. Ray Couture View
12-0014 Billco Manufacturing Ms. Kattie M. Barthlow View
99-0049 Navieras NPR, Inc. Ms. Myriam Rivera View
11-0018 Aluminio No. 7 Ms. Isabel Martinez View
09-0251 Foth Infrastructure & Environment, LLC Ms. Michele L. Frozena View
98-0541 Johnson Law Office, PC Ms. Joanna L. Johnson View
00-0282 Inceptor, Inc. Mr. James R. Watkins View
12-0080 Christensen Company Ms. Rhonda Heltzel View
14-0018 URS Corporation Mr. Andy N. Romach View
15-0130 Green Environmental Consulting Ms. Peggy Haase View
00-0196 Tandem Technologies International Mr. R. Jett Rich View
13-0130 Weiman Products, LLC Mr. Matt Malec View
98-0040 Finetex Inc. Mr. Bob Scala View
06-0264 Intertek Caleb Brett Mr. William J. Cherepon View
14-0058 Transportation Systems Solutions Mr. Peter Olsen View
03-0073 The Embalmers" Supply Company Mr. John R. Jackson View
12-0230 Boreal Aviation, Inc. Mr. Bob Henning View
01-0303 Quay Equestrian Limited Mr. Andrew Stockford View
99-0114 Poly Fiber, Inc. Mr. Gregory Albarian View
08-0220 URS Corporation Ms. Erin N. Jarman View
02-0209 FISC ATACHUB Libby Bishop View
12-0029 Colorcon No Tox Products Mr. Tim Jamison View
01-0212 Office of Motor Carrier Services Mr. Michael Ritchie View
09-0298 Chemical Solutions Mr. Neil M. Canter View
98-0519 The Defense Contract Management Command Ms. Jill E. Pettibone View
03-0022 Transportation Systems Solutions Mr Peter Olsen View
09-0093 Valspar Mr. Eric Barcaskey View
02-0194 HAZSource, Inc Mike Williams View
13-0212 Anpersan, LLC Mr. Gary P. Sanders View
03-0010 TNT Logistics North America Mr. Michael J. Marino View
15-0142 Covington & Burling LLP. Mr. Thomas Brugato View
10-0112 Micro Scientific Industries, Inc. Mr. Jack Wagner View
09-0086 Ready Care Industries Mr. Aaron Yarnell View
07-0186 SPT Technology, Inc. Ms. Mary Van Horne View
10-0221 Metropolis Industries, LLC Mr. Kyle Long View
08-0066 Montana Motor Carrier Services Enforcement Division Lt. Jeff McLaughlin View
98-0533 Lockheed Martin Mr. George Gaskill View
16-0092 Mr. Richard Lloyd View
09-0081 Petronio Shoe Products Corporation Mr. Donald Rinaldi View
05-0001 Mr. Donald Stiger View
15-0053 Mr. Kevin Skerrett View
99-0291 Motor Carrier Compliance Office Captain Ken Carr View
08-0212 International Logistics Brown-Forman Corporation Ms. Christy Larimore View
07-0020 Applied Biosystems Ms. Connie Roxas View
00-0077 Inkware Mr. John Tune View
16-0079 Patterson Companies, Inc. Mr. Robb Boros View
07-0203 Law Offices of Paul D. Borghesani Ms. Angela Hankins View
16-0094 Edmundo B. Fernandez, Inc. Ms. Monica Fernandez View
06-0121 Hydrol Chemical Co., Inc. Mr. Richard W. Hoffman, Jr.  View
12-0009 Yokayo Biofuels Mr. Brian Eberly View
17-0012 Couch Helicopter Ms. Bridgett Couch View
11-0205 AT&T Mr. Jim La Porte View
16-0193 Scopelitis, Garvin, Light, Hanson, Feary, P.C. Mr. Timothy Wiseman View
13-0125 URS Corporation Mr. Andrew N. Romach View
00-0121 Eveready Products Corporation Mr. Sam Vandivort View
10-0014 Destileria Serrallés, Inc. Mr. Roberto Pantoja View
08-0010 D.B. Western, Inc. - Texas Mr. Phil Johnson View
09-0056 Mr. Gene Sanders Thermo Fisher Scientific View
12-0157 Perkins Coie Mr. Christopher J. Sutton View
14-0070 Quest Diagnostics Mr. Nicholas Pagerly View
15-0187R Florida Highway Patrol Lieutenant Bryan Gay View
12-0238 Wers Professional Services Mr. Kevin Skerrett View
09-0247 Mr. James La Porte View
09-0244 EBS-Ink-Jet Systems USA, Inc. Mr. Christopher J. Brown View
07-0160 Charkit Chemical Corporation Mr. Steve J. Catania View
09-0205 URS Corporation Ms. Erin N. Jarman View
16-0149 Tower Products, Inc. Ms. Caron Anderson View
09-0140 DGM Consulting Resources Mr. Jim Shinko View
03-0031 Town Paint & Supply Co. Mr. Jeffrey Aaron View
10-0151 Chemical Solutions Mr. Neil M. Canter View
05-0144 McCormick & Company, Inc. Mr. Timothy D. Brotzman, Sr. View
15-0151 HS&E Coordinator Mr. Peter Leus View
06-0005 Byfield Marine Supply Mr. Keith L. Mauer View
01-0124 Den Plus Inc. Dr. Shuojia Dong View
04-0212 Transportation Development Group Mr. Jim Powell View
01-0037 VP Buildings, Inc. Mr. Randy Geesing View
16-0140 Fuchs Lubricants Co. Mr. Tony Celo View
06-0169 Transportation Development Group Mr. Jim Powell View
11-0141 Kajuligan Corporation Mr. Clifford Croft View
06-0191 The Pinehurst Office Center Mr. Gary A. Peters View
14-0231 PPG- Comex Mr. Israel Villarello View
98-0275 Miller Products Company, Inc. Ms. Pat Czeczuga View
05-0117 Law Offices of Nicholas H. Cobbs Mr. Nicholas H. Cobbs View
15-0051 Scientific Innovations, LLC Mr. Steve Foster View
14-0187 SHISEIDO Group USA Ms. Diana Olivari View
08-0263 Foth Ms. Sheryl Pham View
10-0059 Bureau of Waste Prevention Massachusetts Department of Environmental Protection Mr. Bill Sirull Chief View
03-0052 Tempu Marketing, Inc. Ms. Toi Phillips View
01-0001 Kessler Chemical Mr. Gary J. Kessler View
06-0021 Intertek Caleb Brett New Orleans Mr. Scott Fenwick View
98-0259 John Deere Parts Distribution Center Mr. Steve Wood View
15-0192 Mr. David Gobaud View
01-0268 W.M. Barr & Company Inc. Mr. John Ghio View