Ask X3What does 49 CFR 173.336 (Nitrogen dioxide, liquefied, or dinitrogen tetroxide, liquefied) require?
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Based on 49 CFR 173.336, here are the practical packaging and preparation requirements for transporting liquefied nitrogen dioxide or dinitrogen tetroxide:
* Approved Containers: You must use specification or UN cylinders as prescribed in § 173.192. Note that UN tubes and MEGCs are *not* authorized. If you are using DOT 3AL cylinders, transportation is limited to highway and rail only.
* Valves: Standard cylinder valves are *not* authorized. Cylinders must be equipped specifically with a stainless steel valve and valve seat that will not deteriorate when in contact with the product.
* Valve Openings: Every valve opening must be securely closed using a solid metal plug with tapered threads that are properly luted to prevent any leakage.
* Cleaning Requirements:
* UN pressure receptacles must be cleaned following ISO 11621 requirements.
* DOT specification cylinders must be cleaned according to GSA Federal Specification RR-C-901D (paragraphs 3.3.1 and 3.3.2). You may use equivalent cleaning agents, but they must not be capable of reacting with oxygen.
* Oil Contamination Testing: For every group of 200 or fewer cylinders cleaned at the same time, you must select one cylinder at random and test it for oil contamination following Specification RR-C-901D (paragraph 4.3.2) to ensure it meets the required standard of cleanliness.