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Interpretation Response #04-0277 ([Carleton Technologies, Inc.] [Ms. Amy Vollmer])

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

Interpretation Response Details

Response Publish Date:

Company Name: Carleton Technologies, Inc.

Individual Name: Ms. Amy Vollmer

Location State: NY Country: US

View the Interpretation Document

Response text:

Feb 7, 2005


Ms. Amy Vollmer                 Reference No. 04-0277
Product Manager - Missiles Team
Carleton Technologies, Inc.
10 Cobham Drive
Orchard Park, NY 14127-4195

Dear Ms.Vollmer:

This is in response to your letter requesting clarification of the limited quantity exception for “Helium, compressed, 2.2, UN 1046” under the Hazardous Materials Regulations (HMR; 49 CFR parts 171-180). Your letter states that the helium is in cylinders with a capacity of 6.9 cubic inches, at a pressure of 9,200 psig.

When transported by highway, § 173.3 06(a)(1) excepts limited quantities of certain compressed gases, including compressed helium, from labeling (except when intended for further transportation by air) and the specification packaging requirements when packaged in containers of not more than 4 fluid ounces capacity (7.22 cubic inches or less). Each package must conform to the general requirements in § 173.24 and 173.24a, and may not exceed 30 kg (66 pounds) gross weight. In addition, limited quantity shipments of compressed helium must meet all other requirements in the HMR from which they have not been excepted.

There are no restrictions on the internal pressure when the container has a capacity of 4 ounces or less. However, as a guideline, it is recommended that the container has a ratio of burst pressure to normal operating pressure comparable to the most similar DOT specification packaging. For packagings not comparable to a DOT specification packaging, a ratio of burst pressure to normal operating pressure of five is recommended.

Finally, if part number B45625-l contains a hazardous material, the material must be properly packaged, marked and described in accordance with the applicable HMR requirements. I am returning your drawings marked proprietary which were submitted to this office for review.

I hope this satisfies your request.



Hattie L. Mitchell
Chief, Regulatory Review and Reinvention
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
173.306 Limited quantities of compressed gases