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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