Interpretation Response #14-0203 ([The Cryo Guys] [Mr. Mike Tomasek])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: The Cryo Guys
Individual Name: Mr. Mike Tomasek
Location State: TX Country: US
View the Interpretation Document
Response text:
January 16, 2015
Mr. Mike Tomasek
Operations Manager
The Cryo Guys
7469 Highway 67 E
Cookville, TX 75558
Reference No. 14-0203
Dear Mr. Tomasek:
This is in response to your October 27, 2014 email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to the shipment of liquid nitrogen in open cryogenic receptacles. You ask if special provision 346 of § 172.102(c)(1) prohibits the domestic shipment by ground of nitrogen, refrigerated liquid, UN 1977, in other than a dry shipper engineered with porous material able to absorb all free liquid nitrogen.
Special provision 346 does not restrict the shipment of liquid nitrogen to dry shippers. The additional packaging authorizations in Part 173 referenced in the hazardous materials table remain valid. Section 173.320 provides the general authorization and exceptions for the transport of liquid nitrogen in open cryogenic receptacles. Special provision 346 only provides an exception to the requirements of the HMR for the transport of liquid nitrogen in open cryogenic receptacles in conformance with § 173.320 if the receptacle contains no hazardous material other than the liquid nitrogen and the liquid nitrogen is fully absorbed in a porous material in the receptacle.
Special provision 345 provides an additional exception from the HMR for liquid nitrogen when transported in open cryogenic receptacles with a maximum capacity of 1 liter if constructed and packaged in accordance with the requirements of the special provision.
I trust this information is helpful. If you have further questions, please do not hesitate to contact this office.
Sincerely,
Shane C. Kelley
Acting International Standards Coordinator
Standards and Rulemaking Division
172.102(c)(1), 173.320
Regulation Sections
| Section | Subject |
|---|---|
| 172.102 | Special provisions |
| 173.320 | Cryogenic liquids; exceptions |