USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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

Interpretation Response #13-0116 ([Custom Metalcraft, Inc] [Mr. Eric Larson])

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

Interpretation Response Details

Response Publish Date:

Company Name: Custom Metalcraft, Inc

Individual Name: Mr. Eric Larson

Location State: MO Country: US

View the Interpretation Document

Response text:

September 24, 2013

Mr. Eric Larson
Custom Metalcraft, Inc.
2332 E. Division, P.O. Box 10587
Springfield, Missouri 65808

Ref. No.: 13-0116

Dear Mr. Larson:

This responds to your May 16, 2013 letter requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to the manufacturing and design of portable tanks.  In your letter, you describe the calculations you use for the testing of a specification United Nations (UN) portable tank, under § 178.275, for the transportation of liquid and solid hazardous materials. You ask this Office to verify whether the calculations as presented in your letter are correct and would meet the design requirements prescribed in § 178.275.

This Office does not perform the function of certifying whether a portable tank design meets the UN specification as prescribed in Part 6 of the UN Model Regulations.  However, the HMR provide an application process for approval of a Specification UN portable tank design as specified in § 178.273.  Such applications are submitted to a designated approval agency authorized to approve portable tank designs in accordance with the procedures specified in Subpart E, Part 107, of 49 CFR Volume II, chapter I, subchapter A.

I hope this satisfies your inquiry.  Please contact us if we can be of further assistance.


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


Regulation Sections

Section Subject
178.273 Approval of Specification UN portable tanks
178.275 Specification for UN Portable Tanks intended for the transportation of liquid and solid hazardous materials