[Code of Federal Regulations] [Title 49, Volume 2] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR173.336] [Page 596] TITLE 49--TRANSPORTATION CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents Subpart G--Gases; Preparation and Packaging Sec. 173.336 Nitrogen dioxide, liquefied, or dinitrogen tetroxide, liquefied. Nitrogen dioxide, liquefied, or dinitrogen tetroxide, liquefied, must be packaged in specification cylinders as prescribed in Sec. 173.192. Specification cylinders prescribed in Sec. 173.192 with valve removed are authorized. Each valve opening must be closed by means of a solid metal plug with tapered thread properly luted to prevent leakage. Transportation in DOT 3AL cylinders is authorized only by highway or rail. Each cylinder must be cleaned in compliance with the requirements of Federal Specification RR-C-901C, paragraphs 3.3.1 and 3.3.2 (incorporated by reference; see Sec. 171.7 of this subchapter). Cleaning agents equivalent to those specified in RR-C-901C may be used; however, any cleaning agent must not be capable of reacting with oxygen. One cylinder selected at random from a group of 200 or fewer and cleaned at the same time must be tested for oil contamination in accordance with Specification RR-C-901C, paragraphs 4.4.2.2 (incorporated by reference; see Sec. 171.7 of this subchapter) and meet the standard of cleanliness specified therein. [67 FR 51651, Aug. 8, 2002]