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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

Interpretation Response #12-0144 ([HazMat Resources, Inc.] [Mr. Danny Shelton])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: HazMat Resources, Inc.

Individual Name: Mr. Danny Shelton

Location State: TX Country: US

View the Interpretation Document

Response text:

August 15, 2013

Mr. Danny Shelton
HazMat Resources, Inc.
124 Rainbow Dr., Suite 2471
Livingston, TX  77399-1024

Reference No. 12-0144

Dear Mr. Shelton:

This is in response to your e-mail requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR 171-180) applicable to marking requirements.  Specifically, you ask what criteria establishes the minimum design metal temperature (MDMT) marking that must be included on the name plate on a cargo tank motor vehicle (CTMV) in accordance with the American Society of Mechanical Engineers Code (ASME Code), as prescribed in
§ 178.337-17.  

Section 178.337-17(a) specifies that each cargo tank certified after October 1, 2004 must have a corrosion-resistant metal name plate and specification plate permanently attached to the cargo tank itself or the CTMV chassis.  Further, § 178.337-17(a)(3) states that if the information required by this section is displayed on a name plate required by the ASME Code, the information need not be repeated on the specification plate.  To answer your question regarding the marked MDMT, it is the lowest temperature permitted according to the ASME Code.  Please note that the MDMT is generally not the same as a pressure vessel’s lowest design temperature in the marking required by § 178.337-17(b)(4).  A cargo tank’s design temperature range is based on operating and environmental conditions that can be lower than the MDMT.

I hope this information is helpful.  Please contact this office should you have additional questions.


T. Glenn Foster
Chief, Regulatory Review and Reinvention Branch
Standards and Rulemaking Division  


Regulation Sections

Section Subject
178.337-17 Marking