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Section §178.35: General requirements for specification cylinders

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 178.35 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0031 Essex Industries, Inc. Ario Estrada View
22-0067 Kidde Aerospace and Defense Mark Fazzio View
22-0027 Entegris, Inc. James V. McManus View
20-0088 National Presto Safety J.R. Nerat View
17-0035 Mr. Jared Sherman View
06-0104 CP Industries Mr. G. A. Hayden, PE View
99-0156 Manchester Tank Mr. John Edmondson View
98-0564 Manchester Tank Mr. Randy Wahl View
16-0111 MansourGavin, LPA Mr. Jeffrey Embleton, Esq View
02-0080 Allied Universal Corp. Robin J. Eddy Bolte View
02-0141 The Chlorine Institute, Inc. Gary F. Trojak View
07-0204 E.I. DuPont de Nemours & Co. Mr. Kevin M. Greene View
07-0204 E.I. DuPont de Nemours & Co. Mr. Kevin M. Greene View
02-0295 Structural Composites Industries (SCI) Robert Beck View
14-0147 Gayston Corporation Mr. Christopher A. Cornelius View
15-0001 FIBA Technologies, Inc Mr. Christopher Adams View